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

热感觉的估计是材料评价中的一个重要问题，它是身体的一部分与物体接触时产生的。传热现象可以用接触热阻来模拟，不仅在接触表面的粗糙度和轮廓导致接触不完全的情况下，而且在一定条件下存在薄膜的情况下也是如此。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。在本研究中，用数值方法研究了不同表面材料对有效接触温度的影响。结果表明，表面材料厚度与热效率的比值对有效接触温度的影响随着厚度的减小而迅速增大。制作了两种能够精确改变其温度的器件，并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，预置温度的感知被聚丙烯薄膜的存在所缓和。这一结果与日常经验完全一致，即在存在薄表面材料的情况下，物体的温度更接近于人体温度。

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.