Prediction of high temperature thermal contact conductance considering radiation effects based on fractal theory

IF 6.1 1区 工程技术 Q1 ENGINEERING, MECHANICAL
Mengjun Chen , Zhi Xie , Ping Zhang , Wenlei Lian
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引用次数: 0

Abstract

High temperature thermal contact conductance is a crucial parameter affecting the performance of thermal control and thermal protection systems in many engineering applications under extreme conditions. In this paper, the rough surface of high temperature Inconel 718 alloy (HTA) was characterized and reconstructed based on fractal theory satisfied with a three-dimensional W-M function. The mechanical deformation of contact model was estimated in considering three types of mechanics at the contact points: elastic, elastoplastic, and plastic. The heat transfer between contact surfaces was analyzed account for the conduction of contact points and the radiation between rough surfaces under high temperature conditions. The effects of pressure (0.1–0.6 MPa), temperature (650–1100 K), and fractal parameters on thermal contact conductance were studied through the proposed model. The results show that the contribution of solid conduction and radiation to total thermal contact conductance increases from 45 % to 73 % and from 14 % to 27 % with increasing pressure and temperature, respectively. Also, the thermal contact conductance increases with decreasing and increasing the fractal parameter of D and G, respectively, due to the simulated surface becomes smoother. And the variation tendency is more significant at higher interface pressure. Additionally, the accuracy of the thermal contact resistance prediction model was validated by comparing the predicted results with experimental data.
基于分形理论的考虑辐射效应的高温接触热导预测
在许多极端条件下的工程应用中,高温接触热导是影响热控制和热保护系统性能的关键参数。本文利用分形理论对高温Inconel 718合金(HTA)的粗糙表面进行了表征和重构,并满足三维W-M函数。考虑接触点的三种力学类型:弹性、弹塑性和塑性,估计了接触模型的力学变形。在高温条件下,考虑接触点的传导和粗糙表面之间的辐射,分析了接触面之间的传热。通过该模型研究了压力(0.1 ~ 0.6 MPa)、温度(650 ~ 1100 K)和分形参数对接触热导率的影响。结果表明:随着压力和温度的升高,固体传导和辐射对总接触热导的贡献分别从45 %和14 %增加到73 %和27 %。随着分形参数D和G的减小和增大,热接触导率增大,这是由于模拟表面变得更加光滑。界面压力越高,变化趋势越明显。通过与实验数据的对比,验证了接触热阻预测模型的准确性。
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来源期刊
Tribology International
Tribology International 工程技术-工程:机械
CiteScore
10.10
自引率
16.10%
发文量
627
审稿时长
35 days
期刊介绍: Tribology is the science of rubbing surfaces and contributes to every facet of our everyday life, from live cell friction to engine lubrication and seismology. As such tribology is truly multidisciplinary and this extraordinary breadth of scientific interest is reflected in the scope of Tribology International. Tribology International seeks to publish original research papers of the highest scientific quality to provide an archival resource for scientists from all backgrounds. Written contributions are invited reporting experimental and modelling studies both in established areas of tribology and emerging fields. Scientific topics include the physics or chemistry of tribo-surfaces, bio-tribology, surface engineering and materials, contact mechanics, nano-tribology, lubricants and hydrodynamic lubrication.
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