Show all of your work and clearly identify your final answer

Show all of your work and clearly identify your final answers by circling them with a box Section l: Multiple choices (please circle the ONLY correct answer): Which statement below is NOT correct for natural convection? the thermal boundary layer thickness will continue growing in the direction of flow the velocity is the highest at the boundary layer at a specific location x heat will be transferred from a vertical wall to the surrounding air by conduction in a space craft No-slip condition still applies to natural convection A stainless pipe is used to distribute hot water in the house. The pumping power required is PO. Assume the flow rate is fixed and flow can be analyzed as fully developed laminar flow in this problem, what is the pumping power if the homeowner decides to reduce the pipe diameter to half in order to save space? 16 PO 8 PO 4 PO 2 PO Which statement below is NOT correct for forced internal flow? The temperature profile stays constant once the flow is thermally fully developed The velocity profile remains constant once the flow is hydrodynamicallY fully developed The shear stress is the highest at the tube surface at a given location x h decreases as the fluid flows through a circular tube (assume T_s notequalto T_m in the process) If you calculate Gr/Re^2 and determine its value to be 0.05, which mode(s) of heat transfer should be considered in the corresponding heat transfer analysis? Natural convection Force convection Both natural and force convection Conduction only

Solution

answers are

1.c

2.a

3.b

4.c