Ng E Y, Chua L T
School of Mechanical & Production Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.
J Med Eng Technol. 2000 Nov-Dec;24(6):255-61. doi: 10.1080/03091900010007578.
This paper presents a robust finite element model (FEM) with multiple-layers of varying properties for investigation of burn effects on human skin during a burning process resulting from exposure of skin surface to a contact heat source and a hot moving fluid. Henriques' theory of skin burns is used in conjunction with two-dimensional Pennes bioheat transfer equation for determining the spatial and temporal extent of burn injury. The model developed is a two-dimensional axisymmetric model in cylindrical coordinates. The various tissue layers account for changing thermal properties with respect to skin anatomy. A finite element scheme that uses the backward Euler method is used to solve the problem. The injury processes of skin subsequent to the removal of the heat source (post-burn) will also be inspected. The mesh employed in this model consists of a high density of nodes and elements in which a thorough mesh convergence study was done. A comparison of the transient temperature field computed by this model against Diller's results using the FE technique with a comparatively coarse mesh of 125 elements and experimental data by Orgill et al. has been done in the present study. It concluded that improved accurate solutions have been performed using the robust model developed due to the achievement of a mesh-independent solution.
本文提出了一种具有多层不同属性的稳健有限元模型（FEM），用于研究皮肤表面暴露于接触热源和热移动流体时燃烧过程中烧伤对人体皮肤的影响。Henriques的皮肤烧伤理论与二维Pennes生物热传递方程结合使用，以确定烧伤损伤的空间和时间范围。所开发的模型是圆柱坐标系中的二维轴对称模型。各种组织层考虑了相对于皮肤解剖结构的热特性变化。使用向后欧拉方法的有限元方案用于解决该问题。还将检查去除热源后（烧伤后）皮肤的损伤过程。该模型中使用的网格由高密度的节点和单元组成，其中进行了全面的网格收敛研究。在本研究中，已将该模型计算的瞬态温度场与Diller使用具有125个单元的相对粗糙网格的有限元技术得到的结果以及Orgill等人的实验数据进行了比较。得出的结论是，由于实现了与网格无关的解，使用所开发的稳健模型已经获得了改进的精确解。
