Question: Water at 10°C flows from a reservoir through the convergent nozzle shown in Fig. into a circular tube. The mass flow rate of the water is 9 g/s. Making a plausible assumption as to the origin of the boundary layer in the nozzle and assuming that the nozzle surface is at a uniform temperature different from 10°C, calculate the heat-transfer coefficient at the throat of the nozzle. How does this compare with the coefficient far downstream in the tube if the tube surface is at a uniform temperature?
![1984_10-7.png](https://secure.tutorsglobe.com/CMSImages/1984_10-7.png)