根据传热学理论,推导了对流边界条件下非稳态传热方程分析解中μ的计算新方法,并与用超越方程解出的平壁对流传热的第一个μ进行了比较。结果表明:当Bi值在0.01至0.6之间时,新方法计算的μ值与超越方程解的第1个值相比越来越大;而Bi值在0.6至100之间时,两种方法的值逐渐接近并重合。利用新方法计算的μ值计算了10.8 t冷、热钢锭的加热过程,计算结果与实验结果接近。 According to the theory of heat transfer, a new method of calculating μ in analytical solution of unsteady heat transfer equation under convective boundary conditions is derived and compared with the first μ of convective heat transfer in flat wall solved by transcendental equation. The results show that when the Bi value is between 0.01 and 0.6, the μ value calculated by the new method is larger than the first value surpassing the solution of the equation. When the Bi value is between 0.6 and 100, the two methods The values ​​gradually approach and coincide. The heating value of 10.8 t cold and hot steel ingot was calculated by the μ value calculated by the new method. The calculated result is close to the experimental result.