ABSTRACT

This study has been conducted to illustrate combined heat transfer in a PolyMethylMethAcrylate (PMMA) sample. PMMA is a promising polymer utilized to optical, pneumatic actuation, sensor, analytical separation, and conductive devices. Combined radiation and conduction is considered, corresponding to the problem of one-dimensional transient heat transfer. Numerical results have been obtained by computer implementation, considering the effect of radiation, based on implicit finite difference formulation. Data have been provided from a nonlinear heat conduction equation using Kirchhoff transformation, centered the finite difference scheme by considering temperature conditions applied to the boundaries and monochromatic radiation intensity. In the present study, the temperature distribution and combined heat transfer equation are derived for PMMA. The temperature distribution is verified by the data of other studies that were done before. A comparison of the results showed a very good agreement with others. The results showed a great temperature gradient in the primary positions which cause a large amount of Conductive heat flux. The conductive heat flux was similar to radiative heat flux in terms of behavior but approximately twice in amount. On the other hand, total heat flux was constant at a specific time when it was an approximated steady-state condition.

摘要

本研究旨在说明聚甲基丙烯酸甲酯 (PMMA) 样品中的组合传热。PMMA 是一种很有前途的聚合物，可用于光学、气动驱动、传感器、分析分离和导电装置。考虑了辐射和传导的组合，对应于一维瞬态传热问题。考虑到辐射的影响，基于隐式有限差分公式，已经通过计算机实现获得了数值结果。数据已从使用基尔霍夫变换的非线性热传导方程提供，通过考虑应用于边界和单色辐射强度的温度条件来集中有限差分格式。在本研究中，推导出了 PMMA 的温度分布和组合传热方程。温度分布由之前完成的其他研究的数据验证。结果的比较表明与其他人非常一致。结果表明，主要位置有很大的温度梯度，导致大量的传导热通量。传导热通量在行为方面与辐射热通量相似，但在数量上大约是辐射热通量的两倍。另一方面，当处于近似稳态条件时，总热通量在特定时间是恒定的。传导热通量在行为方面与辐射热通量相似，但在数量上大约是辐射热通量的两倍。另一方面，当处于近似稳态条件时，总热通量在特定时间是恒定的。传导热通量在行为方面与辐射热通量相似，但在数量上大约是辐射热通量的两倍。另一方面，当处于近似稳态条件时，总热通量在特定时间是恒定的。