常物性流体在带直肋的环形通道内作充分发展层流对流换热，内表面为均匀壁温（周向），轴向则呈线性变化，外表面绝热。求：截面上速度分布、温度分布-Constant physical properties of fluid in the annular channel with a straight rib for fully developed laminar flow within the convective heat transfer, uniform wall temperature of t