Expansion Joints
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The presentation will include technical terminologies along with sizing of metallic and non-metallic expansion joints which are used in Steel/Cement/Minerals/Power industries.
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The document discusses expansion joints in civil engineering structures. It defines expansion joints as gaps provided in structures to allow for movement due to temperature changes and prevent cracking. It describes the different types of joints used in concrete and factors that affect the need for expansion joints like material properties and building size. The document outlines best practices for expansion joint design, including proper spacing and installation. It discusses common expansion joint materials like joint fillers, sealing compounds, and water bars used to make the joints watertight. The document also presents a case study on issues with untreated or poorly installed expansion joints like leakage and cracking.
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The document discusses expansion joints in civil engineering structures. It defines expansion joints as gaps provided in structures to allow for movement due to temperature changes and prevent cracking. It describes the different types of joints used in concrete and factors that affect the need for expansion joints like material properties and building size. The document outlines best practices for expansion joint design, including proper spacing and installation. It discusses common expansion joint materials like joint fillers, sealing compounds, and water bars used to make the joints watertight. The document also presents a case study on issues with untreated or poorly installed expansion joints like leakage and cracking.
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Formwork refers to the temporary structure used to support wet concrete until it is cured. There are different types of formwork including wood and steel. Wood formwork uses props, planks, battens and sheeting while steel uses sheets, angles and tees. Formwork must be strong, waterproof, and allow concrete to harden to the required strength before removal. The timing of removal depends on concrete mix design and weather conditions. Formwork is an important part of concrete construction and can account for 20-60% of the total concrete cost.
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If you find these presentation to be beneficial, I would like to welcome you to donate, and support my work in Cement & Concrete Industry. Donation can be made using the following currency/medium:
Bitcoin Address: 36rb4YnbDZsXcCu7i1aXRVvy31j3GoM9YY
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aluminium (high thermal conductivity) are taken. For varying the surface area fin with 11 mm diameter without circumferential
fins, fin with 31 mm diameter and annular fins of 31 mm diameter are taken as specimens. Base to ambient temperature difference
is varied with the aid of dimmerstat ranging from 25W to 45W. Reynolds number is also varied by varying the velocities of air.
Velocities are varied by the aid of fan. Then these fins are tested under different load conditions, different Reynolds number by
varying the surface area of fins increase the rate of heat transfer. With the variation of relevant parameters under forced
convection heat transfer rates are analyzed experimentally. Experiments are conducted by using the annular fins, fin with
diameter 11mm without circumferential fins and fin with diameter 31mm at different Reynolds number and loads under forced
convection and comparison is made between fins. Experimental results shows that forced convection heat transfer rate from fins
depend on surface areas, base ambient temperature difference and Reynolds number. The base temperature for annular fins is
reduced by 30% when compared to fin with diameter 11mm due to increase in surface area about 40%. The base temperature for
annular fins is reduced by 10% when compared to fin with diameter of 31mm due to decrease in surface area about 41%. It is
also observed that at higher heat load i.e., 45W, the overall fin efficiency of annular fins is increased by 44% and 8% compared to
fin with diameter of 11mm and 31mm respectively. At higher Reynolds number range 800-2000, heat transfer rate increases in
annular fins due to more number of air molecules get in contact with the heated surface
IRJET- Experimental Analysis of Oblique Fins to Enhance Heat Trasnsfer
This document presents an experimental analysis comparing the heat transfer performance of oblique fins versus straight fins. Oblique fins have additional channels cut at a 30 degree angle, increasing surface area for heat transfer. Experiments were conducted supplying 6, 8, and 10 watts of heat to fin arrays and measuring temperature. It was found that oblique fins reduced average temperature by 17-22°C compared to straight fins, due to increased fluid contact. Oblique fins also exhibited higher effectiveness, transferring heat more efficiently despite lower heat transfer coefficients. Overall, the oblique fin design enhanced natural convection cooling over straight fins.
Experimentation of Heat Pipe Used In Nano-Fluids
Abstract: Heat pipe are high-efficient heat transfer devices and have been widely applied in various thermal systems. Since heat pipe utilize the phase change of the working fluid to transport the heat, the selection of working fluid is of essential importance to promote the thermal performance of heat pipe. Owing to the heat transfer enhancement effect of nanofluid in the single phase and phase change heat transfer, some researchers have applied various nanofluids in heat pipe as the working fluids to enhance their heat transfer performance.
DESIGN AND FABRICATION OF HELICAL TUBE IN COIL TYPE HEAT EXCHANGER
Heat exchangers are the important engineering systems with wide variety of applications including power plants, nuclear reactors, refrigeration and air-conditioning systems, heat recovery systems, chemical processing and food industries. Helical coil configuration is very effective for heat exchangers and chemical reactors because they can accommodate a large heat transfer area in a small space, with high heat transfer coefficients. This project focus on an increase in the effectiveness of a heat exchanger and analysis of various parameters that affect the effectiveness of a heat exchanger and also deals with the performance analysis of heat exchanger by varying various parameters like number of coils, flow rate and temperature. The results of the helical tube heat exchanger are compared with the straight tube heat exchanger in both parallel and counter flow by varying parameters like temperature, flow rate of cold water and number of turns of helical coil.
IRJET- Analysing the Effectiveness of the Heat Exchanger by Increasing Ov...
This document analyzes the effectiveness of a heat exchanger by increasing its overall heat transfer coefficient. It discusses using wire coil inserts of different pitches inside heat exchanger tubes to disturb the boundary layer and enhance heat transfer. Testing was done on a heat exchanger with water as the working fluid over a Reynolds number range of 2000 to 4000. Results showed that a spring coil with a pitch of 12mm performed better than coils of other pitches at increasing the heat exchanger's overall heat transfer coefficient and effectiveness.
CONVECTIVE HEAT TRANSFER ENHANCEMENTS IN TUBE USING LOUVERED STRIP INSERT
CONVECTIVE HEAT TRANSFER ENHANCEMENTS IN TUBE USING LOUVERED STRIP INSERTInternational Journal of Technical Research & Application
The heat transfer and friction factor were
experimentally investigated in a louvered strip inserted tube in
turbulent flow region. A copper tube of (I.D=28mm, O.D=32mm)
and 900mm length was used. A louvered strip insert with
different geometrical configuration was inserted into the smooth
tube. A uniform heat flux condition was created by wrapping
heating tape of 2500 watt around the test section. Fibre glass
cloth was used as a thermal insulator which surrounds the
heating tape. Outer surface temperature of the tube were
measured at five different equally spaced points of test section by
k-typethermocouples. Two thermocouples were used to measure
the inlet and outlet temperature of water. The Reynolds numbers
were varied in the range of 2500 to 4000 with constant heat flux
of 24 kw/m2 for smooth tube and louvered strip inserted. Nusselt
number and friction factor obtained for louvered strip (with
forward backward arrangement) > Nusselt number and friction
factor for louvered strip (with semi-forward semi-backward
arrangement)> Nusselt number and friction factor for louvered
strip (with forward arrengement).Study of Heat Transfer rate using V-pin Fins by using CFD Analysis
This document summarizes a study that uses computational fluid dynamics (CFD) to analyze heat transfer rates from V-pin fins. The study aims to test different V-fin array models with varying included angles and determine the angle that provides the maximum heat transfer coefficient. The results will be validated against existing literature. CFD is used to obtain discrete solutions to the governing equations for fluid flow and heat transfer around the fin arrays to predict velocity, temperature and heat transfer rate.
A Review on Experimental and CFD Analysis for Heat Transfer Enhancement in He...
This document reviews experimental and computational fluid dynamics (CFD) analyses that have evaluated methods to enhance heat transfer in heat exchanger tubes. Specifically, it focuses on the use of drilled twisted tape inserts of various geometries within the tubes. It provides background on heat exchangers and heat transfer enhancement techniques, including passive techniques like twisted tape inserts. The literature review summarizes several studies that have examined twisted tape inserts computationally or experimentally, finding that inserts can increase turbulence and heat transfer but also pressure drop. The present study aims to contribute additional CFD and experimental analysis of drilled twisted tape inserts of different dimensions to further understand their impact on heat transfer and fluid friction characteristics in heat exchanger tubes.
Design and Analysis of Heat Exchanger for Maximum Heat Transfer Rate (Multi M...
This document summarizes a study on optimizing the design of a shell and tube heat exchanger to maximize heat transfer rate. The researchers designed a shell and tube heat exchanger using standard TEMA specifications. They then analyzed different tube designs, baffle inclinations, and coolant fluids using computational fluid dynamics simulations. The optimum design was found to be a tube with both angled and stepped sections, baffles inclined at 35 degrees, and a coolant of copper oxide nanoparticles in water. This design achieved a temperature drop of 48.6 degrees Celsius between the hot and cold fluids.
Enhancement of heat transfer in tube in-tube heat exchangers using twisted in...
Heat exchangers have several industrial and engineering applications. There are different methods to enhance heat transfer in heat exchangers. Passive technique of heat transfer is the most economical and best suited one. The role of inserts in internal forced convection has been widely acknowledged as a passive device in the heat transfer enhancement. One of such technique is introduction of twisted inserts which enhances the heat transfer coefficient. Twisted aluminium inserts when placed in the path of the fluid flow, creates a high degree of turbulence resulting in an increase in the heat transfer rate. By placing inserts, it is expected that the benefits due to the increased heat transfer coefficient overcome the higher cost involved because of the increased frictional losses. The work mainly focuses on increasing the heat transfer of tube-in-tube heat exchangers by using twisted aluminium inserts. The results obtained from the tube with twisted aluminium insert are compared with those without twisted insert using standard properties of heat transfer (LMTD & Effectiveness). The relations based on the data gathered during this work for predicting the heat transfer coefficient of the horizontal pipe with twisted taped insert are proposed. According to the results, in order to obtain maximum heat transfer, the twist ratio must be at the lowest level.
Analysis The Performance of Parallel Flow and Heat Transfer in Concentric Tub...
This document summarizes a research project analyzing heat transfer performance in concentric tube heat exchangers using computational fluid dynamics (CFD). The research models a double tube parallel flow heat exchanger in SolidWorks and runs CFD simulations to analyze fluid flow and heat transfer under varying parameters. The research aims to better understand heat transfer processes when fluids flow in a double concentric tube heat exchanger. Key findings of previous studies on heat transfer enhancement techniques for heat exchangers are also reviewed.
[IJET-V2I2P12] Authors:Ashok Kumar
The main objectives of the heat transfer analysis is to enhance the heat transfer rate from system to
surrounding. To transfer the heat from any system either by conduction or convection medium. Both modes of
heat transfer has been enhanced by providing an additional equipments in the outer periphery of the heat transfer
system.Fins are basically mechanical structures which are used to cool various structures by the process of
convection. Most part of their design is basically limited by the design of the system. But still certain parameters
and geometry could be modified to better heat transfer. In most of the cases simple fin geometry is preferred such
as rectangular fins and circular fins. Many experimental works has been done to improve the heat release of the
internal combustion engine cylinder and improves fin efficiency.This study presents the results of air flow and
heat transfer in a light weight automobile engine, considering fins with dimple to increase the heat transfer rate.
An analysis has been using ANSYS WORKBENCH version 12.0 was conducted to find the optimum number of
dimples to maximizing the heat transfer across the Automobile engine body. The results indicate that the
presence of fins with dimple shows improved results on the basis of heat transfer.
Paper id 26201495
This document reviews various techniques for enhancing heat transfer through surfaces like tubes and ducts, specifically the use of ribs, fins, and inserts. It begins by classifying heat transfer enhancement techniques as active, passive, or compound. The majority of the document then focuses on passive techniques, including extended surfaces like fins and the use of inserts within ducts or tubes. It provides examples of different rib, fin, and insert configurations that have been used, and summarizes several studies that have experimentally analyzed heat transfer rates and pressure drops associated with these configurations under different parameters. Overall, the document serves as a literature review of using ribs, fins, and inserts to enhance heat transfer through surfaces in a passive manner without external power input.
IRJET- Design and Study of Triangular Plate and Fin Heat Exchanger
The document describes a study comparing three models of a double pipe heat exchanger: 1) a plain cylindrical model with parallel fluid flow, 2) a plain cylindrical model with counter fluid flow, and 3) a model with triangular fins attached to the inner copper tube with parallel fluid flow. An experimental setup was used to test the models, measuring temperature changes and calculating the heat transfer coefficient. The results showed the heat exchanger with triangular fins (Model 3) had the highest heat transfer coefficient, as the fins increased the surface area and induced turbulent flow in the outer fluid. Therefore, the triangular fin design enhanced the heat transfer performance compared to the other two models.
Heat transfer & heat exchanger
This document discusses heat transfer and heat exchangers. It begins by defining heat transfer as the movement of thermal energy from one object to another due to a temperature difference. It then describes the three modes of heat transfer: conduction, convection, and radiation. The document also discusses different types of heat exchangers, including plate heat exchangers, spiral heat exchangers, scraped surface heat exchangers, and air cooled heat exchangers. It provides details on the working principles, advantages, and disadvantages of each type.
Heat exchanger design
Heat exchangers transfer thermal energy between two or more fluids at different temperatures. They are classified based on their transfer process, geometry, heat transfer mechanism, and flow arrangement. Shell-and-tube heat exchangers consist of a set of tubes in a shell container and are the most important type, used across many industries. Their design involves calculating the heat transfer rate, selecting appropriate materials and geometry, and ensuring optimal fluid velocities and pressure drops within design limits.
IRJET- A Review on Basics of Heat Exchanger
This document reviews the basics of heat exchangers. It discusses that heat exchangers are used to transfer heat between two or more fluids for heating and cooling processes. The three main types of heat exchangers are shell and tube, plate, and double pipe heat exchangers. It also discusses computational fluid dynamics as a method to analyze fluid flow and heat transfer in heat exchangers numerically. The document then reviews the basic design methods for two fluid heat exchangers, including the log-mean temperature difference method, effectiveness-NTU method, and other graphical methods.
Experimental Investigation of Pool Boiling Enhancement on Different Structure...
1) The document experimentally investigates pool boiling enhancement on different structured surfaces, including plain, V-shaped, and square structures.
2) The experiment was conducted in a boiling chamber by varying the electric supply and applying/not applying vibration. Surface temperature and heat flux were calculated.
3) The results showed that the square surface provided more appreciable heat flux and heat transfer coefficient compared to the other surfaces. Modifying the surface structure can enhance pool boiling heat transfer.
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CONVECTIVE HEAT TRANSFER ENHANCEMENTS IN TUBE USING INSERT – A REVIEW
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An experimental investigation of annular fins under forced convection
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IRJET- Experimental Analysis of Oblique Fins to Enhance Heat Trasnsfer
IRJET- Experimental Analysis of Oblique Fins to Enhance Heat Trasnsfer
DESIGN AND FABRICATION OF HELICAL TUBE IN COIL TYPE HEAT EXCHANGER
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CONVECTIVE HEAT TRANSFER ENHANCEMENTS IN TUBE USING LOUVERED STRIP INSERT
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