Questions from Thermal Fluid Science

Q: Water initially at 300 kPa and 250°C is contained in

Water initially at 300 kPa and 250°C is contained in a constant-volume tank. The water is allowed to cool until its pressure is 150 kPa. On the P-v and T-v diagrams, sketch, with respect to the satura...

Q: Physically, what does the Grashof number represent? How does the

Physically, what does the Grashof number represent? How does the Grashof number differ from the Reynolds number?

Q: Water flows through a circular pipe. The pipe’s inner diameter is

Water flows through a circular pipe. The pipe’s inner diameter is 2 cm, and its length is 6 m. The average velocity of the water is 15 cm/s, and its inlet temperature is 20°C. Assuming that the heatin...

Q: A vertical 4-ft-high and 6-ft-

A vertical 4-ft-high and 6-ft-wide double-pane window consists of two sheets of glass separated by a 1-in air gap at atmospheric pressure. If the glass surface temperatures across the air gap are meas...

Q: Air flows in a pipe under fully developed conditions with an average

Air flows in a pipe under fully developed conditions with an average velocity of 1.25 m/s and a temperature of 20°C. The pipe’s inner diameter is 4 cm, and its length is 4...

Q: Reconsider Prob. 20–70E. Using appropriate software, investigate

Reconsider Prob. 20–70E. Using appropriate software, investigate the effect of the air gap thickness on the rates of heat transfer by natural convection and radiation and the R-value...

Q: Air flows with an average velocity of 3 ft/s in

Air flows with an average velocity of 3 ft/s in a duct that is 1 ft wide and 1 in high and 40 ft long. The aspect ratio of the duct is very small (0.083), and the duct can be treated as a parallel-pla...

Q: A simple solar collector is built by placing a 5-cm

A simple solar collector is built by placing a 5-cm diameter clear plastic tube around a garden hose whose outer diameter is 1.6 cm. The hose is painted black to maximize solar absorption, and some pl...

Q: Determine the convection heat transfer coefficient for the flow of (a

Determine the convection heat transfer coefficient for the flow of (a) air and (b) water at a velocity of 5 m/s in an 8-cm-diameter and 10-m-long tube when the tube is subjected to uniform heat flux f...

Q: Reconsider Prob. 20–72. Using appropriate software, plot

Reconsider Prob. 20–72. Using appropriate software, plot the rate of heat loss from the water by natural convection as a function of the ambient air temperature as the temperature va...