Design Of A Testing Platform Based On Heat Transfer Property Of Pelage And Its Implementation

As one of the important part of the heat transfer between mammal body and environment, pelage has significant in mammals energy balance. The variety of its structure and function are important for animal adapt to the complex environment. The heat transfer property is a base date for explore the mechanism of insulation, ecological adaptation, evolutionism and the processing technique of pelage. In the domestic, there is not a complete research model for the heat transfer of pelage quantitative study. For the reason, carry on the systematic quantitative study of heat transfer property of pelage, accumulate test experience and data is significant for the corresponding equipment research, development and application. Pelage is a specific biological heat transfer materials. This study draws on the methods and techniques from foreign. In cooperation with the Harbin Institute of Technology, we design a test platform for of thermothysical parameters for integument during steady process. We take samples of summer and winter 10 female and male siberian weasel integuments (Mustela sibirica manchurica Brass) respectively, and investigated the methods of sample preparation and test. In the test of summer and winter pelage, there is significant difference between summer integument and winter integument in heat transfer properyt, and the insulation of summer integument is lower than winters significantly.In order to explore the influencing of hair direction and thickness of fur layer deal with experimenter artificially, we place test sample in different ways to achieve change in hair direction and squash the integument sample by 25 kg weight to achieve the thickness change of the fur layer. The results show:in no wind conditions, laying mode does not produce significant effects to the test, squashed treatment have a significant impact to the test, in low wind speed conditions, laying mode and squashed treatment are both factors; squashed treatment produce a greater impact than laying mode. Furthermore, laying mode produces impact to the winter non-squashed and summer squashed integument significantly. Squashed treatment produces impact both in summer and winter integument, especially to the summer integument. In all conditions, squashed treatment produces a greater impact than laying mode.With the same heatsource, in no wind condition:squashed streatment effect the measuremen of hot, cold surface temperature and heat flux significant than laying mode; squashed treatment and laying mode both effect the mentsurement of hot,cold surface temperature and heat flux tested value in low wind speed condition, and squashed treatment produces a greater affect than laying mode.It was found, the heat transfer coefficient of pelage in the same season groups are differences. In order to explore which reason cause discrepancy in same grope, compared the water ratio and thickness of each sample in same group. The results show:the heat transfer coefficient is negative correlated with water ratio and thickness. The hoist of thickness of integument can raise the water ratio of integument, bur water ratio is not the real factor, the thickness change of integument has higher influence than evaporative cooling. In contrast to water ratio, thickness change in fur layer is one of the main factors to cause discrepancy in same grope.To link with our study with the researches on the morphology of summer and winter integument previously, it suggests:compared to the hair, thickness of fur has less impact on insulation of integument. On the other hand, the length, diameter, density, medulla diameter, absent medulla proportion, scale type, the number of scale of unit length and proportion of each scale type of hair have significant influence to the insulation of integument.SPSS statistic software is applied to analyze the test date. It suggest that the test platform has feasibility on the study of compared the discrepancy of insulation quantitatively in season, hair direction and thickness of integument. Finally, concerning the operation easy to cause the error of measurement, we propose the general testing practices. In connection with the result of this study, we propose the limitations of platform and the function to be expanded. This study has accumulated certain amount of operational experience and reference information of thermal parameters of test. The results of this study will provide the basic data and useful reference for future study.