Intensive Riser Cooling of casting after solidification
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Post solidification intensive riser cooling method (PSIRC) was proposed, in which risers were cooled by forced air or water spray after the solidification of a casting, turning risers into cooling pas-sages during the cooling process of castings in contrast to feeding passages during the solidification process. It may improve production efficiency and reduce residual stress and deformation.
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Vortex tubes are simple and common devices which separates a high-pressure gas flow as two different lower gas flows. One of the outlets has a higher temperature than the inlet high pressure gas and other outlet has lower. Most common types of the vortex tubes are counter and parallel flow types. In counter flow type vortex tubes the cold and hot outlets are on opposite sides and in parallel flow type both the outlets are on the same side. Since it is a simple, well known, compact, portable, highly reliable and has a few initial costs, it could be desirable for the specific heating or cooling and refrigeration applications.
A Review on Study of Heat Transfer Analysis of Helical Coil Heat Exchangers
Now a day’s a geometrically modified Helical coil heat exchangers are widely using in industrial applications like cryogenic state processes, air conditioning, thermal nuclear reactors and waste heat recovery due to their compact size and high heat transfer coefficient. Advantage of using helical coils over straight tubes is that the residence time spread is reduced, allowing helical coils to be used to reduce axial dispersion in tubular reactors. In this study, numerical investigation of the influence of geometrical parameters such as tube diameter d , coil radius R , and coil pitch p on overall heat transfer coefficient in helical double tube heat exchangers are performed using a professional CFD software FLUENT. In recent years, numerous styles were introduced for heat exchangers that apply to completely different applications sadly, their heat transfer co efficient wasnt reliable at different operational conditions. the standard of the heat changed rate wasnt optimized and there have been many deficiencies and errors in styles. The heat transfer of the copper material is enhanced in comparison with other material unfortunately thermal resistance is reduced with an increase in pressure drop thus enhancing the heat transfer on the heat exchanger. Helical architecture is often designed with a clear motive of compact size and also address heat transfer co efficient and other ancillary attributes efficiently and effectively. So the better material is suggested for an industrial heat exchanger according to the applications is Copper with the basis of simulation results. The geometry and different dimension parameter of the helical coil show that the proposed study in different material properties and different mass flow rates to heat transfer are maximum in different parameter helical coil heat exchangers. Finally, the heat transfer increase for the copper material compared to another material but with the increase in pressure drop the corresponding thermal resistance decreases which allow the improved heat transfer rate and the rate increases from Aluminum to Bronze to Copper. With the drop in temperature, the thermal resistance is reduced which enhances the heat transfer rate. The simulation results show that the copper has a high heat transfer coefficient than Aluminum and Bronze while operating in identical conditions. Due to the extensive use of helical coils in various applications, knowledge about the flow patterns and heat transfer characteristics are important. Atul Vats | Sunil Kumar Chaturvedi | Abhishek Bhandari "A Review on Study of Heat Transfer Analysis of Helical Coil Heat Exchangers" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-4 , June 2021, URL: https://www.ijtsrd.compapers/ijtsrd43650.pdf Paper URL: https://www.ijtsrd.comengineering/mechanical-engineering/43650/a-review-on-study-of-heat-transfer-analysis-of-helical-coil-heat-exchangers/atul-vats
Experimental study of heat transfer
This study experimentally analyzed the heat transfer characteristics of R744/R1270 refrigerant mixtures flowing in a horizontal smooth tube. Tests were conducted at varying mass fluxes (40-80 kg/m2s) and heat fluxes (15-24 kW/m2). The heat transfer coefficient, inner wall temperature, and Nusselt number were found to decrease along the length of the tube. Higher mass and heat fluxes resulted in higher heat transfer coefficients and inner wall temperatures. The mixture of R744/R1270 at a 25/75 ratio and mass flux of 80 kg/m2s provided maximum heat transfer.
A Review Paper on Fin Efficiency Enhancement
From the previous couple of decades no of endeavours have made by scientists to upgrade the rate of heat transfer with the utilization of fins by differing number of parameters. The parameters like fin geometries, fin spacing, temperature dissemination, height, length have been explored in this paper. The paper gives some short audits about the methods for improving the rate of heat transfer by use of fins. Principle thought process of the paper is to give some concise information about the efficiency enhancements that can be made in fins to improve heat transfer rate. Naveen Kumar | Udit Singhal "A Review Paper on Fin Efficiency Enhancement" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-1 , December 2019, URL: https://www.ijtsrd.com/papers/ijtsrd29543.pdf Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/29543/a-review-paper-on-fin-efficiency-enhancement/naveen-kumar
Heat Transfer Characteristics of a Plate Fin Heat Sink with Pin Fins of Vario...
In recent decades, attempts have been made to create more advanced effective cooling technology for electronic and microelectronic devices, but heat dissipation is still a major challenge for increasing the cooling performance of heat sinks in a highly competitive electronics market. In the present analysis, the research is designing a new thermal design for plate fin heat sinks with hexagonal pin fin connected to the plate fins. A theoretical analysis focused on publicly usable computational fluid dynamics CFD codes has been performed to test the thermal efficiency of the proposed designs. Modelling done using ANSYS 14.5 and meshing has done using ICEM CFD software, simulations has done by using CFD FLUENT software. In specific, in terms of their thermal performance, hexagonal pin fin connected to the plate fins subject to flow have been contrasted. The plate fin heat sink was made of Aluminium and an electrical heaters provide a heat of 10W constantly to warm up a plate plate fin heat sink with hexagonal pin fin subject to flow of air at variable values i.e. 6.5, 9.5, and 2.5 m s .Based on the results, the analysis has shown that the plate fin heat sinks demonstrate superior thermal performance with hexagonal 3 pin fin subject to flow. The Nusselt number is approximately 1.32 times higher than the conventional plate fin heat sink without pin fin and 1.13 times higher than plate fin heat sink with elliptical 3 pin fin. Prof. Pushparaj Singh | Prashant Kumar Pandey "Heat Transfer Characteristics of a Plate Fin Heat Sink with Pin Fins of Various Profile using CFD" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-4 | Issue-6 , October 2020, URL: https://www.ijtsrd.com/papers/ijtsrd33375.pdf Paper Url: https://www.ijtsrd.com/engineering/mechanical-engineering/33375/heat-transfer-characteristics-of-a-plate-fin-heat-sink-with-pin-fins-of-various-profile-using-cfd/prof-pushparaj-singh
What's hot (17)
Conjugate Heat Transfer Analysis in a Cryogenic Microchannel Heat Exchanger
Conjugate Heat Transfer Analysis in a Cryogenic Microchannel Heat Exchanger
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Effect of controlling parameters on heat transfer during spray impingement co...
CFD Analysis of Plate Fin Tube Heat Exchanger for Various Fin Inclinations
CFD Analysis of Plate Fin Tube Heat Exchanger for Various Fin Inclinations
Numerical simulation of a tube in tube helical coiled heat
Numerical simulation of a tube in tube helical coiled heat
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heat transfer performance in 3D induced finned heat pipe
heat transfer performance in 3D induced finned heat pipe
Modelling and Simulation of Shell and Tube Heat Exchanger Using different Typ...
Modelling and Simulation of Shell and Tube Heat Exchanger Using different Typ...
A comprehensive review on Heat and fluid flow in Baffled Pipe/Channel
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A Review on Study of Heat Transfer Analysis of Helical Coil Heat Exchangers
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Directional solidification in GDC dies through cooling and heating Design in ...
Directional solidification in GDC dies through cooling and heating Design in ...AnirudhKumarprajapat
1. Improve production by reducing cycle time through cooling channel.
2. Enhancement of mechanical properties.
3. Validation of Experiment with Simulation.
4. Avoid die soldering.
Heat Transfer in Metallic Hydrides
The hydrogen economy has been under rapid growth and development in recent years. Metal hydride based hydrogen storage systems deserve attention as they offer higher storage densities compared to high-pressure gas storage. It is the most compatible and economic method to store hydrogen. In these metal hydride storage devices, low heat transfer has been a key issue. The heat transfer rate can be enhanced by using various techniques.
A two-dimensional numerical analysis of coupled heat and mass transfer processes in a cylindrical metal hydride reactor containing MmNi4·6Al0·4 is presented. Performance studies on MmNi4·6Al0·4 based hydrogen storage device are carried out by varying the hydrogen supply pressure, absorption (cooling fluid) temperature and hydride bed thickness.
STUDY ON PREDICTION OF MECHANICAL PROPERTIES OF LARGE RING-SHAPED FORGING DEP...
Large ring-shaped forgings manufactured by ring rolling, as heavy as 10 tons, are greatly affected by cooling. In the present study, controlled cooling was performed to improve the mechanical properties of large ring-shaped forgings. To quantify cooling rate, thermocouples were used to measure the cooling rate and the microstructures of the products were observed during still air cooling, fan cooling, mist control cooling, and water quenching. The temperature distribution measured in the four cooling methods was used to calculate the heat transfer coefficient in each cooling method by the inverse method. The mechanical properties were tested with specimens obtained from the test block for each cooling method, and continuous cooling transformation (CCT) curves were obtained by using measured microstructure contents. The mechanical properties of the regions corresponding to the regions of the specimens were calculated on the basis of the CCT curves and the heat transfer coefficients. The experimental values and the analytical values of the strength of the products manufactured by each cooling method were compared to verify that the mechanical properties at each region of the products depending on the cooling methods may be predicted
Ppt
The document discusses a seminar on studying the behavior of hyperbolic cooling tower shells with pipe openings using a 1:50 scale model subjected to seismic loads. Hyperbolic cooling towers are large reinforced concrete structures that extract heat from water to cool it. The seminar focuses on analyzing a scaled down model of a cooling tower subjected to earthquake loads. Sensors are placed on the model to measure strains and deflections under simulated seismic conditions to understand how the structure responds.
F352426
1) The document presents a CFD study analyzing heat transfer enhancement in multi-lead rifled (MLR) boiler tubes compared to plain wall tubes.
2) The study varied geometric parameters of MLR tubes like number of riflings, rifling height, and pitch length to optimize heat transfer.
3) Simulation results at the operating conditions of an actual boiler show increased heat transfer and temperature with MLR tubes versus plain tubes. Implementation of optimized MLR tubes in the boiler is recommended to improve furnace heat transfer.
F352426
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
F352426
1) The document describes a CFD study analyzing heat transfer enhancement in multi-lead rifled (MLR) boiler tubes compared to plain wall tubes.
2) The study varied geometric parameters of MLR tubes like number of riflings, rifling height, and pitch length to optimize heat transfer.
3) Simulation results at the operating conditions of an actual boiler showed increased heat transfer and temperatures with MLR tubes versus plain tubes.
278 icaer 2013 revised
The document summarizes research on performance analysis of high temperature sensible heat storage systems during charging and discharging cycles. The objectives were to develop a thermal model to predict performance, optimize the storage bed design, and analyze performance of beds made of cast steel and concrete. The results show that charging times were 683 seconds for cast steel and 3650 seconds for concrete, with energy storage of 62.85 MJ and 62.39 MJ respectively. Discharging times and energy recovered were also reported. Exergy efficiency was analyzed. Thermal models were validated and provided insights into heat transfer and temperature variations during the cycles.
Comparative Analysis of Forced Draft Cooling Tower Using Two Design Methods A...
Cooling towers make use of evaporation whereby some of the water is evaporated into a moving air stream and subsequently discharged into the atmosphere which results in cooling of the remainder water. The current research reviews various studies conducted on cooling tower using experimental and numerical techniques. Different design configuration and operating conditions on cooling towers are evaluated by various researchers. Significant findings from researches have shown new and improved design of cooling tower with much better performance as compared to conventional design. Neetish Kumar Sao | Dr. Surendra K. Dwivedi "Comparative Analysis of Forced Draft Cooling Tower Using Two Design Methods: A Review" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-5 | Issue-5 , August 2021, URL: https://www.ijtsrd.com/papers/ijtsrd45100.pdf Paper URL: https://www.ijtsrd.com/engineering/mechanical-engineering/45100/comparative-analysis-of-forced-draft-cooling-tower-using-two-design-methods-a-review/neetish-kumar-sao
final project.docx
This document is a research project submitted in partial fulfillment of the requirements for a degree in Mechanical and Mechatronics Engineering. It contains an abstract, introduction, and 4 chapters that discuss cooling towers, their components, thermal performance testing, and electrical components. The introduction provides background on cooling towers and how they work to lower water temperature through evaporation and heat transfer to the atmosphere. It also discusses prior research on improving cooling tower performance. The abstract indicates the research examines different types of cooling towers, their application, efficiency, and working principles, and includes a simulation of flow fields around a cooling tower.
Experimental Investigation of Heat Transfer through Rectangular and Trapezoid...
The document describes an experimental investigation of heat transfer through rectangular and trapezoidal fins made of aluminum 6063 alloy. Rectangular and trapezoidal fins were fabricated from the alloy and experiments were conducted under steady state conditions. Local temperature, heat flux, heat transfer coefficients, and Reynolds numbers were estimated. The findings showed that forced convection was more effective than free convection, and the trapezoidal fin enhanced heat transfer by up to 48% compared to the rectangular fin under different heat supply conditions. The document provides details on the experimental setup, material properties of the aluminum 6063 alloy, and methodology for collecting temperature readings along the fins.
Cooling Tower
This document provides an overview of an experiment analyzing the performance of a mechanical draft cooling tower. The experiment varied the water flow rate and fan speed to measure water temperature changes. The Merkel equation was then used to calculate the "tower characteristic" or coefficient of performance. As the water to air flow rate ratio (LG) increased, the tower characteristic and efficiency decreased, matching the Merkel theory. The conclusion is that higher water flow rates decrease the cooling tower's efficiency and characteristic.
Plate heat exchanger
The document discusses plate heat exchangers. It describes how plate heat exchangers use metal plates to transfer heat between two fluids flowing in alternating passages. They are classified as plate and frame, brazed, or welded depending on how the plates are joined. Benefits include compact size and high efficiency. Limitations include limited operating pressures and temperatures as well as susceptibility to fouling. In conclusion, plate heat exchangers offer advantages over shell and tube exchangers and their performance can be further enhanced through design.
Analysis on thermal performance of Co3O4 Nanofluid in heat exchanger
Final year mechanical engineering project presentation. Findings obtained through simulations, using ANSYS. Modelling done using SolidWorks. Tabulated results and graphical representation of results portraying comparison to performance of Al2O3 nanofluid in same model.
IRJET- Flow and Heat Transfer Charecterstics of Multiple Jet Cooling
The document summarizes research on heat transfer characteristics of multiple jet cooling for electronic components. Experiments were conducted using an array of 49 water jets impinging on an electrically heated copper plate. The jet diameter was 0.5mm, arranged in a 7x7 square array with 3mm pitch. Tests were run at flow rates of 22-40 ml/min and heat fluxes of 25-200W/cm2. Results showed that heat transfer coefficient, or Nusselt number, increased with increasing heat flux and Reynolds number. Prior studies on jet impingement cooling are also summarized.
E012142024
The document describes an air conditioning system with a ground source heat exchanger (ACSWGSHE) that was designed and tested. A conventional 1.5 ton split air conditioner was modified by replacing the condenser with a ground heat exchanger placed 15 meters underground. The heat exchanger was made of copper tubing in a helical coil shape. Testing showed the system performed best when the borehole was filled with water, achieving a coefficient of performance of 3.72, higher than the 2.11 COP of the conventional split system.
Air Conditioning System with Ground Source Heat Exchanger
This document summarizes the design, development, and testing of an air conditioning system with a ground source heat exchanger (ACSWGSHE). The ACSWGSHE was tested with the borehole filled with still air, water, and sand. Testing found that the ACSWGSHE achieved the highest coefficient of performance (COP) of 3.72 when the borehole was filled with water, compared to a COP of 2.11 for a conventional split air conditioner. Power consumption was also 29% lower for the ACSWGSHE with water filling compared to the conventional system. However, when the borehole was filled with sand, the COP decreased to 1.07 due to improper heat exchange between the condenser
Mech 2016- projects list
This document lists 50 mechanical engineering projects available for master's students in 2016 at Newzen Infotech. The projects cover various topics including machine design, finite element method, computational fluid dynamics, thermal engineering, and more. The projects involve analysis of topics such as vibration, composite materials, heat transfer, fluid flow, thermodynamics, and multiphase flow. Contact information is provided for Newzen Infotech, which is located in Karimnagar and Hyderabad, India.
MSEC2012_poster_Cisneros_Jorge
This study investigated the effect of local reheating on the formability of ultra-high strength DP980 steel. Tensile test coupons with various induction heating profiles were tested to evaluate properties. Peak heating temperature and cooling rate were found to be the key parameters. Heating to 900°C and fast cooling increased elongation by 100% while maintaining strength, through reducing martensite volume. Microstructure analysis showed fast cooling produced a finer grain structure. The developed local heating and testing technique can effectively evaluate reheating effects on formability for automotive body applications.
PloymerHX_ppt
This presentation reviews polymer heat exchangers for thermal systems. Currently, heat exchangers rely on metals but polymers offer lower costs and weight. The presentation discusses challenges of polymers' lower thermal conductivity and strength compared to metals. It also outlines properties of common polymers and how new designs address challenges through thin materials and turbulent flow. Various polymer applications are reviewed, including liquid-to-liquid, gas-to-gas, and cryogenic heat exchangers. In conclusion, with advances in materials and design, polymers show promise for lower-cost, lighter heat exchangers.
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By understanding inductive bias, you can gain valuable insights into how machine learning models work and make informed decisions when building and deploying them.
A review on techniques and modelling methodologies used for checking electrom...
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
Recycled Concrete Aggregate in Construction Part II
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
TIME DIVISION MULTIPLEXING TECHNIQUE FOR COMMUNICATION SYSTEM
Time Division Multiplexing (TDM) is a method of transmitting multiple signals over a single communication channel by dividing the signal into many segments, each having a very short duration of time. These time slots are then allocated to different data streams, allowing multiple signals to share the same transmission medium efficiently. TDM is widely used in telecommunications and data communication systems.
### How TDM Works
1. **Time Slots Allocation**: The core principle of TDM is to assign distinct time slots to each signal. During each time slot, the respective signal is transmitted, and then the process repeats cyclically. For example, if there are four signals to be transmitted, the TDM cycle will divide time into four slots, each assigned to one signal.
2. **Synchronization**: Synchronization is crucial in TDM systems to ensure that the signals are correctly aligned with their respective time slots. Both the transmitter and receiver must be synchronized to avoid any overlap or loss of data. This synchronization is typically maintained by a clock signal that ensures time slots are accurately aligned.
3. **Frame Structure**: TDM data is organized into frames, where each frame consists of a set of time slots. Each frame is repeated at regular intervals, ensuring continuous transmission of data streams. The frame structure helps in managing the data streams and maintaining the synchronization between the transmitter and receiver.
4. **Multiplexer and Demultiplexer**: At the transmitting end, a multiplexer combines multiple input signals into a single composite signal by assigning each signal to a specific time slot. At the receiving end, a demultiplexer separates the composite signal back into individual signals based on their respective time slots.
### Types of TDM
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Embedded machine learning-based road conditions and driving behavior monitoring
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DEEP LEARNING FOR SMART GRID INTRUSION DETECTION: A HYBRID CNN-LSTM-BASED MODEL
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model is rigorously trained and evaluated, exhibiting remarkable performance
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IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
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Intensive Riser Cooling of casting after solidification
- 1. Course- SEMINAR 1 ( MTTH199) intensive riser cooling of casting after solidification BY LOKESH BAVISKAR (M1754005) Guided by- DR. R.S.MAURYA 1
- 2. INTRODUCTION CENTRAL IDEA NON UNIFORM TEMPERATURE DISTRIBUTION 2
- 3. LITERATURE REVIEW Efficient and economical manufacture of heavy steel castings Yu, H.L., Kang, J.W., Huang, T.Y., 2010. HIGH THERMAL GRADIENT RESIDUAL STRESS OR DEFORMATION 3
- 4. LITERATURE REVIEW Developing a localized squeeze cooling technique for improved casting solidification Singh, D., Navaneeth, V., Lee, J., 2011 air gap between the casting/mold interface Movable water-cooled chill 4
- 5. LITERATURE REVIEW Thermal and grain-structure simulation in a land- based turbine blade directionally solidified with the liquid metal cooling process Kermanpur, A., Rappaz, M., Varahram, N., Davami, P., 2000 LMC process Heat by conduction and natural convection 5
- 6. LITERATURE REVIEW The ablation casting process Grassi, J., Campbell, J., Hartlieb, M., Major, F., 2009 AIR GAP CONTROL RATE OF COOLING ABLATION CASTING TECHNOLOGY HIGH CHILL RATE 6
- 7. LITERATURE REVIEW Finite-element analysis on thermomechanical behavior of a marine propeller casting in the sand-casting process Lee, S.M., Lee, W.J., 2005 Rapid but uneven cooling martensitic phase transformation at low temperature 7
- 8. Post solidification intensive riser cooling8
- 9. Close loop PSIRC system9
- 10. Case study 1: stress frame specimen Pair of casting (700 ˚c) Compressed air at speed Of 25 m/s (5 atm) 10
- 12. Comparison of temp fields12
- 13. Case study 2: a hydro turbine blade13
- 16. Effect of PSIRC on mechanical properties16
- 17. Conclusions Post solidification intensive riser cooling method (PSIRC) was proposed, in which risers were cooled by forced air or water spray after the solidification of a casting, turning risers into cooling pas-sages during the cooling process of castings in contrast to feeding passages during the solidification process. it may improve production efficiency and reduce residual stress and deformation. 17
- 18. Conclusions The cooling speed of a stress frame specimen casting increased apparently and its temperature uniformity was improved under PSIRC One day was saved for a hydro turbine blade casting of 0.9ton melt before shakeout under PSIRC. The strength and hardness at the riser bottom were improved; meanwhile, its residual stress was greatly reduced 18
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