Effect of interstitial compounds in controlling thermal contact conductance across pressed joints at cryogenic temperature and low contact pressure
TL;DR: In this article, thermal contact conductance across joints at cryogenic temperature in presence of interstitials like silicon based conductive compound, epoxy based adhesive layer and acrylate based anaerobic sealant are explored.
About: This article is published in Applied Thermal Engineering.The article was published on 2021-07-25. It has received 6 citations till now. The article focuses on the topics: Thermal contact conductance & Heat transfer.
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TL;DR: In this article , several fundamental physical characteristics of liquid metal (LM) that are crucial for thermal management applications are discussed, and a comparison of the thermal properties of LM and conventional thermal management materials is highlighted, and the preparation methods of LM as thermal interface materials (TIMs), phase change materials (PCMs), and heat transfer fluids (HTFs) are summarized.
Abstract: Liquid metal (LM), a new functional metal material, has drawn a lot of interest since it can stay in the liquid phase at ambient temperature or below. Furthermore, advanced heat dissipation technology has undergone significant modifications as a result of the fluidity, high thermal conductivity, and high phase change latent heat per unit volume of LM. In this paper, several fundamental physical characteristics of LM that are crucial for thermal management applications are discussed. The comparison of the thermal properties of LM and conventional thermal management materials is then highlighted, and the preparation methods and thermal management applications of LM as thermal interface materials (TIMs), phase change materials (PCMs), and heat transfer fluids (HTFs) are summarized. Finally, present technical challenges and future development direction are put forward.
8 citations
TL;DR: In this article , the authors investigated the influence mechanism and change law of the contact thermal resistance characteristics on flange installation and conducted a theoretical analysis of contact thermal resistances and the calculation of a typical flange mounting edge based on actual operating conditions.
Abstract: According to the discontinuous structural characteristics of a gas turbine, by considering the contact thermal resistance of the rough surface, a contact thermal resistance measurement experiment was conducted in this study. The main objectives of this work were to investigate the influence mechanism and change law of the contact thermal resistance characteristics on flange installation. Furthermore, this study conducted a theoretical analysis of contact thermal resistance and the calculation of a typical flange mounting edge based on actual operating conditions. The research results show that the contact thermal resistance of a typical flange mounting edge increases with an increase in flange clearance under different tightening torques, which is essentially proportional to the flange clearance. As the flange clearance increases, the unit contact thermal conductivity firstly decreases rapidly. Then, as the flange clearance reaches 0.4 mm, the decreasing rate of unit contact thermal conductivity tends to flatten. In addition, the contact thermal resistance of the typical flange mounting edge decreases with the increase in the tightening torque under different flange clearances. Furthermore, the contact area ratio is not related to the material, and the contact thermal resistance under actual working conditions can be calculated using the unit contact area.
3 citations
TL;DR: In this article , a three-layer back propagation artificial neural network (ANN) model was proposed to retrieve thermal contact conductance (TCC) of two contact solid specimens using the measured temperatures and loading pressures, and the effects of loading pressure, temperature and surface roughness on TCC were considered.
1 citations
TL;DR: In this article , a novel non-intrusive method for estimating the spatially varying thermal contact conductance for thin-plate bolted joints used in spacecraft thermal control systems is presented.
TL;DR: In this article , an experimental study has been performed systematically to address the requirement of design engineers for the accurate estimation of thermal contact conductance (TCC) is a fundamental need towards the optimal design of any cryogen-free conduction-based cooling systems, which routinely utilizes mechanically pressed components of bare copper to form the heat conduction path.
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Book•
01 Jan 1971
TL;DR: In this paper, the authors present basic concepts and analysis of experimental data for basic electrical measurements and sensors, including Displacement and Area Measurements, Pressure Measurement, Flow Measurement and Temperature Measurement.
Abstract: 1 Introduction 2 Basic Concepts 3 Analysis of Experimental Data 4 Basic Electrical Measurements and Sensing Devices 5 Displacement and Area Measurements 6 Pressure Measurement 7 Flow Measurement 8 The Measurement of Temperature 9 Thermal and Transport-Property Measurements 10 Force, Torque, and Strain Measurements 11 Motion and Vibration Measurement 12 Thermal and Nuclear-Radiation Measurements 13 Air-Pollution Sampling and Measurement 14 Data Acquisition and Processing 15 Report Writing and Presentations 16 Design of Experiments Appendix A-Conversion Factors and Material Properties Appendix B-Digital Imaging Systems
2,943 citations
TL;DR: In this paper, the authors consider the resistance to the flow of heat between two thick solid bodies in contact in a vacuum and compare the performance of single idealized contacts with results of recent electrolytic analog tests to predict the conductance of multiple contacts.
966 citations
TL;DR: In this article, the effect of the mode of deformation on the value of thermal conductance of flat surfaces in contact has been investigated and explicit expressions for thermal contact conductance were derived for cases of: (1) pure plastic deformation (2) plastic deformations of the asperities and elastic deformation of the substrate, and (3) pure elastic deformations on the substrate.
519 citations
Book•
01 Jan 1996
TL;DR: In this paper, thermal constriction resistance and solid spot thermal conductance of a joint are investigated. But they do not consider the effect of gas gap conductance on the performance of the joint.
Abstract: Contents: Introduction.- Thermal Constriction Resistance.- Solid Spot Thermal Conductance of a Joint.- Gas Gap Conductance.
325 citations
TL;DR: In this article, the experimental values of the thermal boundary resistance occurring at interfaces between two solids at sub-ambient temperatures are reviewed, and new data are presented in the temperature range from 4 K to 300 K for the thermal resistance between different metals (Cu, stainless steel), interlayered by various cryogenic bonding agents (Apiezon-N, Cryocon grease, In and InGa), or mechanically connected (dry) contacts.
Abstract: The experimental values of the thermal boundary resistance occurring at interfaces between two solids at sub-ambient temperatures are reviewed. New data are presented in the temperature range from 4 K to 300 K for the thermal resistance between different metals (Cu, stainless steel), interlayered by various cryogenic bonding agents (Apiezon-N, Cryocon grease, In and InGa), or mechanically connected (dry) contacts. Depending on the contact materials, the thermal conductance varies between and at room temperature, and decreases approximately linearly by one order of magnitude between 200 K and 20 K. Our experimental data agree well with the data reported in the literature for the temperature range below 4 K and measurements near room temperature.
127 citations