Convection heat-transfer coefficient at an animal body surface based on the body shape

本研究的目的是对动物体表的对流换热进行数值分析。本文介绍了一种动物体表对流换热系数的计算方法，即（1）动物体表形状的数值表示，（2）动物体表空气流动和热流的数值计算，（39）动物体表对流换热系数的估算。通过对猪的体型测量，计算出猪体的三维坐标值，建立了猪的多面体曲面模型。本文采用表面模型，从连续性方程、运动方程和能量方程出发，计算了猪体表的空气和热量流动。在三维分析之前，对二维模拟进行了研究。该方程由流函数和涡量以及无量纲变量转化。然后利用有限元法将这些方程离散化，模拟了不同雷诺数和Grashof数下猪体表面无量纲气流速度和温度的二维分布。

The purpose of this study is the numerical analysis on the convection heat transfer at an animal body surface. The procedure is (1) the numerical-value expression of an animal body shape, (2) the numerical computation on the air and heat flows on an animal body surface and (39 the estimation of the convection heat-transfer coefficient at an animal body surface.the three-dimensional shape measurement of a pig was conducted by using the light-sectioning method. The three-dimensional coordinate values of a pig body shape were calculated from the shape measurement, and the polyhedric surface-model of a pig was constructed. The surface-model was used in this study.The air and heat flows on a pig body surface are calculated from the continuity, motion and energy equations. The two-dimensional simulation was investigated before the three-dimensional analysis. The equations were transformed by the stream function and vorticity, and by the dimensionless variables. And then these equations were changed to the dicrete forms by using the finite element method (FEM).The two-dimensional distributions of the dimensionaless air-velocity and air-temperature on the pig body surface are continued to simulate under different Reynolds and Grashof numbers.