Effective Thermal Properties of Multilayered Systems with Interface Thermal Resistance in a Hyperbolic Heat Transfer Model

2010 ◽  
Vol 31 (4-5) ◽  
pp. 900-925 ◽  
Author(s):  
J. Ordóñez-Miranda ◽  
J. J. Alvarado-Gil
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Thermal Resistance ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Interface Thermal Resistance ◽  
Multilayered Systems ◽  
Effective Thermal Properties

Experimental Investigation of Heat Transfer in Impingement Air Cooled Plate Fin Heat Sinks

2005 ◽  
Vol 128 (4) ◽  
pp. 412-418 ◽  
Author(s):  
Zhipeng Duan ◽  
Y. S. Muzychka
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Thermal Resistance ◽  
Thermal Performance ◽  
Heat Transfer Model ◽  
Heat Sinks ◽  
Transfer Model ◽  
Transfer Coefficients ◽  
Developing Flow ◽  
Rectangular Channels

Impingement cooling of plate fin heat sinks is examined. Experimental measurements of thermal performance were performed with four heat sinks of various impingement inlet widths, fin spacings, fin heights, and airflow velocities. The percent uncertainty in the measured thermal resistance was a maximum of 2.6% in the validation tests. Using a simple thermal resistance model based on developing laminar flow in rectangular channels, the actual mean heat transfer coefficients are obtained in order to develop a simple heat transfer model for the impingement plate fin heat sink system. The experimental results are combined into a dimensionless correlation for channel average Nusselt number Nu∼f(L*,Pr). We use a dimensionless thermal developing flow length, L*=(L∕2)∕(DhRePr), as the independent parameter. Results show that Nu∼1∕L*, similar to developing flow in parallel channels. The heat transfer model covers the practical operating range of most heat sinks, 0.01<L*<0.18. The accuracy of the heat transfer model was found to be within 11% of the experimental data taken on four heat sinks and other experimental data from the published literature at channel Reynolds numbers less than 1200. The proposed heat transfer model may be used to predict the thermal performance of impingement air cooled plate fin heat sinks for design purposes.

scholarly journals The Interface Thermal Resistance Evolution between Carbide-Bonded Graphene Coating and Polymer in Rapid Molding for Microlens Array

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2334
Author(s):  
Xiaohua Liu ◽  
Cheng Guo ◽  
Yandong Liu ◽  
Feng Wang ◽  
Yanfeng Feng
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Rapid Heating ◽  
Microlens Array ◽  
Heating Process ◽  
Transfer Model ◽  
3D Graphene ◽  
Resistance Evolution ◽  
Interface Thermal Resistance ◽  
Resistance Model

Surface rapid heating process is an efficient and green method for large-volume production of polymer optics by adopting 3D graphene network coated silicon molds with high thermal conductivity. Nevertheless, the heat transfer mechanism including the interface thermal resistance evolution between 3D graphene network coating and polymer has not been thoroughly revealed. In this study, the interface thermal resistance model was established by simplifying the contact situation between the coating and polymethylmethacrylate (PMMA), and then embedding into the finite element method (FEM) model to study the temperature variations of PMMA in surface rapid heating process. Heating experiments for graphene network were then carried out under different currents to provide the initial heat for heat transfer model. In addition, residual stress of the PMMA lens undergoing the non-uniform thermal history during molding was presented by the simulation model together. Finally, the optimal molding parameters including heating time and pressure will be determined according to calculation results of the interface thermal resistance model and microlens array molding experiment was conducted to illustrate that the interface thermal resistance model can predict the temperature of the polymer to achieve a better filling of microlens array with smooth surface and satisfactory optical performance.

Environmental modifications in a pig growth model for early-weaned piglets

1989 ◽  
Vol 48 (3) ◽  
pp. 591-599
Author(s):  
L. D. Jacobson ◽  
S. G. Cornelius ◽  
K. A. Jordan
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Growth Model ◽  
Heat Production ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Daily Growth ◽  
Environmental Component ◽  
Piglet Growth ◽  
Latent Heat Loss

ABSTRACTA food-driven pig growth model was developed from two existing mathematical models. The new model predicts daily growth and heat production of early-weaned pigs. An existing pig growth model was altered by replacing the environmental component with a heat transfer model. The heat transfer model was further refined by partitioning latent heat loss between the skin and lungs, adding a thermal resistance for hair coat, and increasing tissue thermal resistance. Results from this combined model were compared with experimental observations of daily piglet growth and heat production at 15°C, 20°C, 25°C and 30°C. Good agreement existed between observed data and model predictions for piglet growth. Heat production predictions did not compare as well with experimental observations as did growth, especially when piglets lost weight.

A New Lumped Thermal Resistance Heat Transfer Model for Fuel Pin Structure

2016 ◽  
Vol 196 (3) ◽  
pp. 588-597
Author(s):  
Shisheng Wang ◽  
Andrei Rineiski ◽  
Liancheng Guo
Keyword(s):  
Heat Transfer ◽  
Thermal Resistance ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Fuel Pin

Pulsed Thermal Imaging Measurement of Thermal Properties for Thermal Barrier Coatings Based on a Multilayer Heat Transfer Model

2014 ◽  
Vol 136 (8) ◽  
Author(s):  
J. G. Sun
Keyword(s):  
Heat Transfer ◽  
Thermal Properties ◽  
Surface Temperature ◽  
Thermal Barrier Coatings ◽  
Thermal Imaging ◽  
Temperature Response ◽  
Heat Transfer Model ◽  
Thermal Barrier ◽  
Transfer Model ◽  
Barrier Coatings

Thermal properties of thermal barrier coatings (TBCs) are important parameters for the safe and efficient operation of advanced turbine engines. This paper presents a new method, the pulsed thermal imaging–multilayer analysis (PTI–MLA) method, which can measure the coating thermal conductivity and heat capacity distributions over an entire engine component surface. This method utilizes a multilayer heat transfer model to analyze the surface temperature response acquired from a one-sided pulsed thermal imaging experiment. It was identified that several experimental system parameters and TBC material parameters may affect the coating surface temperature response. All of these parameters were evaluated and incorporated as necessary into the formulations. The PTI–MLA method was demonstrated by analyzing three TBC samples, and the experimental results were compared with those obtained from other methods.

A Heat Transfer Model for Concentrating Silicon Solar Cells in a Spectrally Splitting Hybrid Receiver

2014 ◽  
Author(s):  
Ahmad Mojiri ◽  
Cameron Stanley ◽  
Elizabeth Thomsen ◽  
Vernie Everett ◽  
Andrew Blakers ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Solar Cells ◽  
Heat Transfer Model ◽  
Silicon Solar Cells ◽  
Transfer Model

Theoretical Post-Dryout Heat Transfer Model

2018 ◽  
Vol 1 (1) ◽  
pp. 142-150
Author(s):  
Murat Tunc ◽  
Ayse Nur Esen ◽  
Doruk Sen ◽  
Ahmet Karakas
Keyword(s):  
Heat Transfer ◽  
Droplet Diameter ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Operating Pressure ◽  
Vertical Pipe ◽  
Two Phase ◽  
Experimental Values ◽  
Reactor Operating ◽  
Coolant System

A theoretical post-dryout heat transfer model is developed for two-phase dispersed flow, one-dimensional vertical pipe in a post-CHF regime. Because of the presence of average droplet diameter lower bound in a two-phase sparse flow. Droplet diameter is also calculated. Obtained results are compared with experimental values. Experimental data is used two-phase flow steam-water in VVER-1200, reactor coolant system, reactor operating pressure is 16.2 MPa. On heater rod surface, dryout was detected as a result of jumping increase of the heater rod surface temperature. Results obtained display lower droplet dimensions than the experimentally obtained values.

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