A、(a)H<sub>2sub>O(l,373K,100kPa)与(b)H<sub>2sub>O(g,373K,100kPa) B、(a)H<sub>2sub>O(l,373K,200kPa)与(b)H<sub>2sub>O(g,373K,200kPa) C、(a)H<sub>2sub>O(l,374K,100kPa)与(b)H<sub>2sub>O(g,374K,100kPa) D、(a)H<sub>2sub>O(l,373K,100kPa)与(b)H<sub>2sub>O(g,373K,200kPa)
试求算临界长度x<sub>csub>,该处的速度边界层厚度δ和温度边界层厚度δ<sub>tsub>,局部对流传热系数h<sub>xsub>和层流段平均对流传热系数h<sub>msub>的值。