论文部分内容阅读
利用一维稳态(火用)传递方程,对平壁在第一类边界条件下的一维稳态导热过程的(火用)传递做了数值计算,并就导热系数为定值与变值的两种计算结果进行了比较。结果表明,由于传递过程的不可逆性,过程中(火用)流密度是下降的,(火用)传递系数不仅与材料的几何尺寸有关,还与其热物性和内部温度分布有关。因温度对导热系数和(火用)流密度均有影响,只有在导热系数较大的情况下,(火用)传递计算中取导热系数为定值才能保证误差比较小,该结论与实际情况符合得较好。
One-dimensional steady-state (exergy) transfer equations are used to numerically calculate the exergy transfer of one-dimensional steady-state thermal conduction of a flat wall under the first boundary conditions. The two calculation results were compared. The results show that due to the irreversibility of the transfer process, the exergy flux density decreases, and the exergy transfer coefficient is not only related to the material geometry, but also to its thermophysical properties and internal temperature distribution. Due to the influence of temperature on the thermal conductivity and exergy flow, the thermal error can only be guaranteed to be small if the thermal conductivity is large, which is in agreement with the actual situation In line with better.