Question: Consider liquid sodium at 200°C flowing normal to a 2.5 cm diameter tube at a velocity of 0.6 m/s. Using the results of Prob., calculate the "conduction" thickness of the thermal boundary layer at the stagnation point. Calculate the corresponding "shear" thickness of the momentum boundary layer at the stagnation point and discuss the significance of the results.
Problem: Develop an approximate solution of the energy equation for flow at a two-dimensional stagnation point for a fluid with very low Prandtl number, using the assumption that the thermal boundary layer is very much thicker than the momentum boundary layer. From this, develop an equation for heat transfer at the stagnation point of a circular cylinder in cross flow, in terms of the oncoming velocity and the diameter of the tube.