人的传热系数.pdf

TRANSACTION ON CONTROL AND MECHANICAL SYSTEMS, VOL. 1, NO. 8, PP. 362-369, DEC., 2012. Determining Natural Convection Heat Transfer Coefficient of Human Body Ahmad Najjaran Abstract: In this paper, the aim is obtaining convection analytical simulation these conditions would set as an input. coefficient of human body. At first a 3D human body has been Also due to calculating up to some decimals, the accuracy designed by unstructured grids. Feet and hands are stretched of the calculating is much more than the experimental completely in considered sample. Two segments (standing and measurements which have limitations. In some studies supine) are considered for body. Soles and the back of entire convection heat transfer coefficient is determined by using body are considered in contact with the ground respectively in these segments. Other parts of human body are exposed to the ratio of a specific surface area to the entire body area surrounding air. The heat transfer and the body temperature and by use of the local coefficient. In most of these studies are assumed steady and constant. The results are obtained by the accuracy of the results is decreased because of ignoring applying finite volume method for each grid and extracted by surfaces which don’t have any convection heat transfer with the weighted area method. Then the attained results are surrounding air. The natural convection coefficient is validated with the recent experimental results. Good