一维稳态导热过程的传递规律及计算

One dimensional regularity and calculation of exergy transferring in steady heat conduction Process

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。

Based on the exergy transfer equations, exergy transferring in the steady heat conduction process are calculated for the infinite plate at the first type boundary condition, and two results are compared when conductivity is stable and changed with temperature in this paper. The results show that exergy flow density is declined because of the irreversibility of the process, and exergy transfer coefficient is related to not only the size of materials but also the heat physical character and the distribution of temperature; because temperature have effects on both the conductivity and exergy flow density, in the calculation of exergy transfer, the fact that conductivity is regarded as a constant is permitted only it's relative larger.