Fractal Model for Thermal Contact Conductance
Fractal Model for Thermal Contact Conductance
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DOI：
10.1115/1.2953304
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发表时间：
2008-10
影响因子：
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通讯作者：
Mingqing Zou;Bo-ming Yu;Jianchao Cai;P. Xu
中科院分区：
文献类型：
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作者：
Mingqing Zou;Bo-ming Yu;Jianchao Cai;P. Xu
开发了基于分形几何理论的随机数模型来计算两个接触的粗糙表面的接触热导（TCC）。这项研究是通过几何和力学研究进行的。本研究表明分形参数D和G对TCC具有重要影响。将所提出的模型的预测与现有的实验数据进行比较，通过拟合参数D和G观察到良好的一致性。结果表明，对于相对较大的G和D，不应忽视现有模型中经常忽略的体电阻对TCC的影响。该模型的主要优点是粗糙表面上粗糙度分布的随机化。目前的结果也表明比其他模型的结果更符合实际情况。所提出的技术可能具有预测其他现象的潜力，例如粗糙表面上的摩擦、辐射、磨损和润滑。
A random number model based on fractal geometry theory is developed to calculate the thermal contact conductance (TCC) of two rough surfaces in contact. This study is carried out by geometrical and mechanical investigations. The present study reveals that the fractal parameters D and G have important effects on TCC. The predictions by the proposed model are compared with existing experimental data, and good agreement is observed by fitting parameters D and G. The results show that the effect of the bulk resistance on TCC, which is often neglected in existing models, should not be neglected for the relatively larger G and D. The main advantage of this model is the randomization of roughness distributions on rough surfaces. The present results also show a better agreement with the practical situation than the results of other models. The proposed technique may have the potential in prediction of other phenomena such as friction, radiation, wear and lubrication on rough surfaces.