Introduction of "Effective Contact Temperature" equation into experiment and application to practical product

当身体的一部分接触物体时引起的热感觉的估计是材料评估中的重要关注点。传热现象可以使用接触热阻来建模，不仅在由接触表面的粗糙度和轮廓导致的不完美接触的情况下，而且在一定条件下存在薄膜的情况下。我们提出了“有效接触温度”公式，由于我们周围的许多产品都覆盖着由不同材料制成的表面，当表面材料变薄时，该公式不适用。在这项研究中，不同的表面材料的有效接触温度的影响进行了研究，使用数值方法。研究表明，随着厚度的减小，表面材料厚度与热扩散系数的比值对有效接触温度的影响迅速显著，并制作了两个能够精确改变其温度的装置，考察了表面材料对接触表面温度和热感觉的影响。结果表明，预设温度的感知是缓和的聚丙烯膜的存在。这一结果完全符合日常经验，即物体的温度在薄的表面材料存在下感觉更接近体温。

Estimation of thermal sensation which is caused when a part of the body contacts an object is an important concern in material evaluation. Heat transfer phenomenon can be modeled using thermal contact resistance, not only in the case of imperfect contact that results from the roughness and the contour of the contact surface but also the case where a thin film exists under definite conditions. We have suggested "Effective contact temperature" equation.Since a lot of our surrounding's products are covered with a surface which is made of different materials, the equation is not applicable when the surface material becomes thin. In this research, the influence of different surface material on effective contact temperature is examined using a numeric method. We have shown that the influence of the ratio of thickness of surface material and thermal effusivity on effective contact temperature becomes rapidly marked with a decrease in thickness.Two devices that were able to change their temperature precisely were made, and the influence of surface material on contact surface temperature and thermal sensation were examined. It was shown that the perception of a preset temperature was moderated by the existence of a polypropylene film. This result corresponds exactly to the daily experience that object's temperatures are felt closer to body temperatures in the presence of thin surface material.