気体中で低い接触圧で接触する固体粗面間の熱コンダクタンス : 表面の微小凹凸のこう配の非等方性および凹凸高さの確率分布形状の影響

概要

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To predict the thermal conductance of machined surfaces in contact in a gas environment, the existing isotropic Gaussian surface theory is extended for surfaces having surface slope anisotropy and non-Gaussian asperity height distribution. The bivariate normal distribution and the inverted chi-square distribution are used to model the slope anisotropy and the non-Gaussian height distribution. The total conductance of the contacting surfaces is expressed as the sum of gas conductance and solid contact conductance, and a nondimensional equation which predicts the total conductance is derived. The extended theory shows that the slope anisotropy has no influence on the gas conductance, whereas the non-Gaussian height distribution increases both the gas conductance and the solid contact conductance. Experiments are performed to measure the total conductance for three different machined surfaces, ground AIN, ground MoCu (85Mo15Cu) and milled Cu, at low contact pressures from 0.006 to 0.5 MPa. Helium and nitrogen are used as the interstitial gases. The theoretical results agree with the experimental data, although the theory tends to overestimate the solid contact conductance.
一般社団法人日本機械学会の論文
1995-05-25