This document summarizes a study that investigated the heat transfer properties of carbon nanotube (CNT) composites, with a focus on conduction mode heat transfer. Multi-wall carbon nanotubes were synthesized using chemical vapor deposition inside anodic aluminum oxide templates to create aligned CNT composites. Randomly oriented CNT and graphite films were also prepared. Specific heat capacity and thermal conductivity measurements from 300-400K revealed that aligned CNT composites had higher thermal conductivity than randomly oriented films, demonstrating the anisotropic heat transfer properties of aligned CNT structures. Randomly oriented CNT and graphite films showed similar thermal properties.
Developed a physics-based model describing electric, thermal interaction between the lightning channel and CFRP composite panel (Most advanced model related to lightning strike damage in composite structure in existing literature)
Applied the developed models for evaluation of material ablation in the NASA carbon fiber-reinforce polymer-matrix composite substrate due to simulated lightning current injection
A 1D finite element charring ablation model has been developed with ABAQUS
Multiple ABAQUS subroutines have been developed to accommodate the charring heat conduction and the surface energy balance formulations
Model verification has been performed through a code-to-code verification with FIAT (developed by NASA Ames) using the TACOT 3.0 test material system
Model validation has been performed by comparing ABAQUS predictions with published experiment data by the Koo Research Group
Temperature differences between ABAQUS prediction and experimental data necessitates needs for further investigation
Influence of input power in Ar/H2 thermal plasma with silicon powder by numer...TELKOMNIKA JOURNAL
Numerical simulation in inductively coupled thermal plasma was made on the temperature distribution in argon (Ar)+hydrogen (H2) induction thermal plasma torch with silicon (Si) powder injection to obtain the temperature distribution and gas flow fields. The ICTP model was used in this research because it has benefit of good repeatability and no contamination process. Interactions between ICTP and injected powder are very complicated to be understood only by related experiments. Influence of input power in ICTP was numerically investigated on thermal plasma temperature fields and powder evaporation. The temperature distributions of thermal plasma and Si vapor distribution were compared at input powers of 20 kW, 30 kW, and 40 kW. Results indicated that higher input power increases the temperature of the thermal plasma with doughnut shape but it slightly enhances evaporation of the powder at the center axis of the plasma torch.
Traditional UMESHMOTION + ALE method with ABAQUS is not applicable for modeling ablation of laminated composite laminates
A manual mesh moving (MMM) FEA procedure with ABAQUS is proposed to model ablation of composite laminates
The MMM procedure is verified with simulations using existing validated method (i.e., the traditional UMESHMOTION + ALE method)
A case study was presented to demonstrate the capability of using the proposed MMM for the modeling of ablation for a CFRP composite laminate
Developed a finite element analysis (FEA) procedure for calculating the electric field in the wind turbine blades due to a lightning stepped leader and estimate whether dielectric breakdown occurs
Developed a physics-based model describing thermal interaction between the lightning channel and composite structure
Applied the developed models for evaluation of thermal damage in the non-conductive All-glass Baseline Wind Turbine Blade (SNL 100-00) due to lightning strike
Applied the model to evaluate the thermal ablation damage in the electrically conductive CFRP composite subjected to the lightning strike
Validated the numerical model by comparing the simulation results with reported experimental results
Developed a physics-based model describing electric, thermal interaction between the lightning channel and CFRP composite panel (Most advanced model related to lightning strike damage in composite structure in existing literature)
Applied the developed models for evaluation of material ablation in the NASA carbon fiber-reinforce polymer-matrix composite substrate due to simulated lightning current injection
A 1D finite element charring ablation model has been developed with ABAQUS
Multiple ABAQUS subroutines have been developed to accommodate the charring heat conduction and the surface energy balance formulations
Model verification has been performed through a code-to-code verification with FIAT (developed by NASA Ames) using the TACOT 3.0 test material system
Model validation has been performed by comparing ABAQUS predictions with published experiment data by the Koo Research Group
Temperature differences between ABAQUS prediction and experimental data necessitates needs for further investigation
Influence of input power in Ar/H2 thermal plasma with silicon powder by numer...TELKOMNIKA JOURNAL
Numerical simulation in inductively coupled thermal plasma was made on the temperature distribution in argon (Ar)+hydrogen (H2) induction thermal plasma torch with silicon (Si) powder injection to obtain the temperature distribution and gas flow fields. The ICTP model was used in this research because it has benefit of good repeatability and no contamination process. Interactions between ICTP and injected powder are very complicated to be understood only by related experiments. Influence of input power in ICTP was numerically investigated on thermal plasma temperature fields and powder evaporation. The temperature distributions of thermal plasma and Si vapor distribution were compared at input powers of 20 kW, 30 kW, and 40 kW. Results indicated that higher input power increases the temperature of the thermal plasma with doughnut shape but it slightly enhances evaporation of the powder at the center axis of the plasma torch.
Traditional UMESHMOTION + ALE method with ABAQUS is not applicable for modeling ablation of laminated composite laminates
A manual mesh moving (MMM) FEA procedure with ABAQUS is proposed to model ablation of composite laminates
The MMM procedure is verified with simulations using existing validated method (i.e., the traditional UMESHMOTION + ALE method)
A case study was presented to demonstrate the capability of using the proposed MMM for the modeling of ablation for a CFRP composite laminate
Developed a finite element analysis (FEA) procedure for calculating the electric field in the wind turbine blades due to a lightning stepped leader and estimate whether dielectric breakdown occurs
Developed a physics-based model describing thermal interaction between the lightning channel and composite structure
Applied the developed models for evaluation of thermal damage in the non-conductive All-glass Baseline Wind Turbine Blade (SNL 100-00) due to lightning strike
Applied the model to evaluate the thermal ablation damage in the electrically conductive CFRP composite subjected to the lightning strike
Validated the numerical model by comparing the simulation results with reported experimental results
RESEARCH ON INDUCTION HEATING - A REVIEWEditor IJCATR
This paper presents results of finite element analysis of induction heating problems considering temperature dependence of
material characteristics. In this analysis, we have used the three-dimensional finite element method in order to correctly express
induction heating coil’s shapes and to make clear its effects on temperature distributions. The heat-conducting problem and the eddy
current problem are coupled, and solved by using the step-by-step calculations.
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.
Different Topics Dealing With Sputtering Of Cu, Ni And Cu-Ni Targets In Diffe...iosrjce
IOSR Journal of Applied Physics (IOSR-JAP) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Annealing and Microstructural Characterization of Tin-Oxide Based Thick Film ...Anis Rahman
Abstract. The sheet resistance of tin oxide based thick-film resistors exhibits two regions of temperature dependence,
described by hopping (23°C-200°C) and diffusion mechanisms (200°C-350°C), respectively.
Annealing these samples causes the sheet resistance to increase in both regions. In the post-annealed samples,
the hopping conduction range is extended by 50°C (23°C-250°C) while the hopping parameter, To, is decreased by
more than 50%. The activation energy of diffusion (0.60 eV) is the same for both pre- and post annealed samples, but
the magnitude of resistance in the diffusion controlled region is increased significantly as a result of annealing. These
changes are explained in terms of a net decrease in the concentration of tin ions in the glass matrix. From a careful
microstructural study it was found that a conduction path composed of tin-oxide grains or their clusters in contact
with each other does not exist in the present system. HREM micrographs showed the presence of nanocrystalline
tin-oxide particles in the glass phase separating the tin-oxide grain clusters. Estimated average separation between
the nanocrystals in 4 nm, consistent with a variable-range hopping conduction via the dissolved tin ions in the glass
matrix.
The webinar is about the through induction heating of metal bodies with simple geometry, like billets or bars. Through heating is a thermal process applied before the hot working of metals, like extrusion or forging processes. In the webinar the following topics are discussed:
* Choice of frequency, power and heating time for non magnetic and magnetic materials
* Batch and continuous through heating
* Fast through heating processes
* Typical configurations of industrial heater
* Innovative induction heating with permanent magnets also for taper heating of aluminium billets
Development of Thermal Conductivity Measurement Test Rig for Engineering Mate...IOSR Journals
This paper describe the development of a hot rod method by using water as a coolant medium which
measure the heat loss through the rod for the steady state measurement of thermal conductivity of small
samples. The heat flow through the test sample was essentially one dimensional and heat loss through
engineering material is made to use heated guard to block the flow of heat from the hot rod to the
surroundings. Since large correction factors must be applied to account for guard imperfection and not
maintained ideal condition. So that it may be preferable to simply measure and correct for the heat that flows
from the heater disc to directions other than into the sample. Experimental measurements taken in a prototype
apparatus combined with extensive computational modeling of the heat transfer in the apparatus show that
sufficiently accurate measurements can be obtained to allow determination of thermal conductivity of
engineering material. Suggestions are made for further improvements in the method based on results from
regression analysis of the generated data.
RESEARCH ON INDUCTION HEATING - A REVIEWEditor IJCATR
This paper presents results of finite element analysis of induction heating problems considering temperature dependence of
material characteristics. In this analysis, we have used the three-dimensional finite element method in order to correctly express
induction heating coil’s shapes and to make clear its effects on temperature distributions. The heat-conducting problem and the eddy
current problem are coupled, and solved by using the step-by-step calculations.
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.
Different Topics Dealing With Sputtering Of Cu, Ni And Cu-Ni Targets In Diffe...iosrjce
IOSR Journal of Applied Physics (IOSR-JAP) is a double blind peer reviewed International Journal that provides rapid publication (within a month) of articles in all areas of physics and its applications. The journal welcomes publications of high quality papers on theoretical developments and practical applications in applied physics. Original research papers, state-of-the-art reviews, and high quality technical notes are invited for publications.
Annealing and Microstructural Characterization of Tin-Oxide Based Thick Film ...Anis Rahman
Abstract. The sheet resistance of tin oxide based thick-film resistors exhibits two regions of temperature dependence,
described by hopping (23°C-200°C) and diffusion mechanisms (200°C-350°C), respectively.
Annealing these samples causes the sheet resistance to increase in both regions. In the post-annealed samples,
the hopping conduction range is extended by 50°C (23°C-250°C) while the hopping parameter, To, is decreased by
more than 50%. The activation energy of diffusion (0.60 eV) is the same for both pre- and post annealed samples, but
the magnitude of resistance in the diffusion controlled region is increased significantly as a result of annealing. These
changes are explained in terms of a net decrease in the concentration of tin ions in the glass matrix. From a careful
microstructural study it was found that a conduction path composed of tin-oxide grains or their clusters in contact
with each other does not exist in the present system. HREM micrographs showed the presence of nanocrystalline
tin-oxide particles in the glass phase separating the tin-oxide grain clusters. Estimated average separation between
the nanocrystals in 4 nm, consistent with a variable-range hopping conduction via the dissolved tin ions in the glass
matrix.
The webinar is about the through induction heating of metal bodies with simple geometry, like billets or bars. Through heating is a thermal process applied before the hot working of metals, like extrusion or forging processes. In the webinar the following topics are discussed:
* Choice of frequency, power and heating time for non magnetic and magnetic materials
* Batch and continuous through heating
* Fast through heating processes
* Typical configurations of industrial heater
* Innovative induction heating with permanent magnets also for taper heating of aluminium billets
Development of Thermal Conductivity Measurement Test Rig for Engineering Mate...IOSR Journals
This paper describe the development of a hot rod method by using water as a coolant medium which
measure the heat loss through the rod for the steady state measurement of thermal conductivity of small
samples. The heat flow through the test sample was essentially one dimensional and heat loss through
engineering material is made to use heated guard to block the flow of heat from the hot rod to the
surroundings. Since large correction factors must be applied to account for guard imperfection and not
maintained ideal condition. So that it may be preferable to simply measure and correct for the heat that flows
from the heater disc to directions other than into the sample. Experimental measurements taken in a prototype
apparatus combined with extensive computational modeling of the heat transfer in the apparatus show that
sufficiently accurate measurements can be obtained to allow determination of thermal conductivity of
engineering material. Suggestions are made for further improvements in the method based on results from
regression analysis of the generated data.
Low Cost Synthesis of Single Walled Carbon Nanotubes from Coal Tar Using Arc ...IOSRJAP
There are various methods such as arc discharge, laser ablation, chemical vapour deposition (CVD), template-directed synthesis for the growth of CNTs in the presence of catalyst particles. The production of carbon nanotubes in large quantities is possible with inexpensive coal as the starting carbon source by the arc discharge technique. It is found that a large amount of carbon nanotubes of good quality can be obtained in the cathode deposits in which carbon nanotubes are present in nest-like bundles. For more than two decades, now, there has been extensive research on the production of carbon nanotubes (CNT) and optimization of its manufacture for the industrial applications. It is believed that they are the strong enough but most flexible materials known to mankind. They have potential to take part in new nanofabricated materials. It is known that, carbon nanotubes could behave as the ultimate one-dimensional material with remarkable mechanical properties. Moreover, carbon nanotubes exhibit strong electrical and thermal conducting properties. This paper primarily concentrates on the optimising such parameters related to the mass production of the product. It has been shown through Simplex process that based on the cost of the SWNT obtained by the arc discharge technique, the voltage and the current should lie in the range of 30 - 42 V and 49 - 66 A respectively. Any combination above the given values will lead to a power consumption cost beyond the final product cost, in turn leading to infeasibility of the process. Strong expectations exist for future use of carbon nanotubes as composite materials in a large number of industries. Production cost and control of the purity and properties of such materials will influence the impacts nanotubes on the chemical, computer and construction industries. Coal properties in this case are also important. Weak bonds and mineral matter in the coal play an important role in the formation of the nanotubes
Carbon Nano tubes and its Applications in the Field of Electronics and Comput...ijsrd.com
With rapid advancement of technology and unlimited quest in the intricate fields of science led man to confront nano tubes. It consists of C60 Fullerenes with tube like structures capped at both ends delivering extraordinary mechanical and electrical properties. It is hard to stress as extremely low turn on for fields and has high current densities. It is also the best emission field emitter for future field emission displays. Can be extensively used for fuel cells and field emission display. We throw a light on the research on nano tubes and it's general applications. In this paper we are focusing and questioning the field of research to ponder for the betterment off life to nano tube.
This presentation provides a comprehensive and in-depth exploration of Carbon Nanotubes, beginning with the foundational principles and advancing to more complex concepts. Its purpose is to offer a student-oriented elucidation of this subject matter. This PowerPoint presentation serves as a highly valuable tool for undergraduate students pursuing Nanoelectronics, as it encompasses all the crucial aspects of Carbon Nanotubes, facilitating a clear understanding of the topic.
Ph d defense_rajmohan_muthaiah_University_of_oklahoma_07_28_2021Rajmohan Muthaiah
This slide describes the thermal transport in polymers, polymer nanocomposites and semiconductors using molecular dynamics simulations and first principles calculations
Synthesis of MWNTs, DWNTs and SWNTs buckypaper using triton x 100. and compar...Awad Albalwi
In this study buckypaper of MWNTs, DWNTs and SWNT have been synthesised using filtration of carbon nanotubes dispersed in 1% TritonX 100 as solvents. Dispersions were generated by pulse sonication of each single wall carbon nanotubes (SWNTs) , Double wall carbon nanotubes (DWNTs) and Multi wall carbon nanotubes in TritonX solvent. Fist, sonication times were investigated for these CNTs to determine the optimum conditions for generating stable dispersions of carbon nanotubes. It was found that optimal dispersions could be generated using Trion X-100 solvent with all these carbon nanotube by using 30minute periods of pulse sonication. The Three buckypapers of MWNTs, DWNTs and SWNTs were produced by filtering dispersions of carbon nanotubes which had undergone 30 minutes of pulse sonication in TritonX100. Conductivity and measurements of the three buckypaper (SWNT,DWNT&MWNT) samples yielded average values of 14.24 , 23 and 19 Scm-1 respectively. Mechanical measurements were determined successfully . Homogeneity in the produced buckypapers were investigated confirming by scanning electron microscopy .
Similar to Investigation of heat transfer through cnt composites focusing on conduction mode (20)
Tech transfer making it as a risk free approach in pharmaceutical and biotech iniaemedu
Tech transfer is a common methodology for transferring new products or an existing
commercial product to R&D or to another manufacturing site. Transferring product knowledge to the
manufacturing floor is crucial and it is an ongoing approach in the pharmaceutical and biotech
industry. Without adopting this process, no company can manufacture its niche products, let alone
market them. Technology transfer is a complicated, process because it is highly cross functional. Due
to its cross functional dependence, these projects face numerous risks and failure. If anidea cannot be
successfully brought out in the form of a product, there is no customer benefit, or satisfaction.
Moreover, high emphasis is in sustaining manufacturing with highest quality each and every time. It
is vital that tech transfer projects need to be executed flawlessly. To accomplish this goal, risk
management is crucial and project team needs to use the risk management approach seamlessly.