Consider pressurized water, engine oil (unused), and nak (22%/78%) flowing in a 20-mm-diameter tube. (a) determine the mean velocity, the hydrodynamic entry length, and the thermal entry length for each of the fluids when the fluid temperature is 366 k and the flow rate is 0.01 kg/s. (b) determine the mass flow rate, the hydrodynamic entry length, and the thermal entry length for water and engine oil at 300 and 400 k and a mean velocity of 0.02 m/s.