2. Air at 50°C and essentially atmospheric pressure is flowing through a 10 cm x 10 cm rectangular duct at a velocity of 10 m/s. If the wall temperature of the duct is 25 °C, and the length of the duct is 50 m, calculate the drop in the air temperature.

Suppose that in a coating process a solid sheet immersed in a liquid is pulled steadily at velocity U through a slot in a die, as shown in the figure. The die dimensions are such that there is a liquid gap of thickness H on each side of the sheet. Far downstream from the die the coating has a final thickness H... The pressure in the upstream liquid is ambient (P = Po) and gravitational and surface tension effects are negligible. The die length is L and the system width is W. The liquid is Newtonian and Re is such that the flow is laminar. Liquid P = Po X Die Liquid Solid Sheet Liquid Die H Gas P = Po Width = W Hoo U (a) Assuming fully developed flow, determine vx(y) for the liquid in the upper gap. Be sure to use the coordinates shown. (b) Determine the force required to pull the sheet through the die. You may assume that the shear force on the sheet in the upstream liquid (x < 0) is negligible. (c) Assuming that H is given, determine H...

What is the moving boundary work during a process with a piston-cylinder device connected to a linear spring, air is compressed from 0.4 m3 to 0.1 m3 while pressure increases from 200 kPa to 400 kPa.

A Q4: A diffuser, has air entering at 100 kPa, 280 K, with a velocity of 200 m/s. The inlet cross-sectional area of the diffuser is 100 mm2. At the exit, the area is 860 mm2, and the exit velocity is 20 m/s. Determine the exit pressure and temperature of the air. Take Cp=1.005 KJ/kg.K A: 280 K B: 300 K C: 320 K D: 340 K * 2) Determine the exit pressure of the air if inlet temperature of the air 300 K. A: 124 KP B: 134 KP C: 144 KP * D: 154 KP