Three surfaces of an instrument package are cooled by soldering half-sections of copper tubing to it as

Question:

Three surfaces of an instrument package are cooled by soldering half-sections of copper tubing to it as shown in Fig. 9.31. Compute the Reynolds number for each section if ethylene glycol at 77?F flows with an average velocity of 15 ft/s. Then compute the energy loss over a length of 54 in.