Questions from Thermal Fluid Science

Q: During air cooling of oranges, grapefruit, and tangelos, the

During air cooling of oranges, grapefruit, and tangelos, the heat transfer coefficient for combined convection, radiation, and evaporation for air velocities of 0.11

Q: Air is flowing through a smooth, thin-walled, 4

Air is flowing through a smooth, thin-walled, 4-in-diameter copper tube that is submerged in water. The water maintains a constant temperature of 60°F and a convection heat transfer coeffic...

Q: Hot water at 90°C enters a 15-m section

Hot water at 90°C enters a 15-m section of a cast iron pipe (k = 52 W/m⋅K) whose inner and outer diameters are 4 and 4.6 cm, respectively, at an average velocity of 1.2 m/...

Q: The force required to expand the gas in a gas spring a

The force required to expand the gas in a gas spring a distance x is given by F = Constant / xk where the constant is determined by the geometry of this device and k is determined by the gas used in t...

Q: Repeat Prob. 19–121 for a pipe made of copper

Repeat Prob. 19–121 for a pipe made of copper (k = 386 W/m⋅K) instead of cast iron. Data from Prob. 19-121: Hot water at 90°C enters a 15-m section of...

Q: Hot exhaust gases leaving a stationary diesel engine at 450°C

Hot exhaust gases leaving a stationary diesel engine at 450°C enter a 15-cm-diameter pipe at an average velocity of 7.2 m/s. The surface temperature of the pipe is 180°C. Determine the pipe length if...

Q: Geothermal steam at 165°C condenses in the shell side of

Geothermal steam at 165°C condenses in the shell side of a heat exchanger over the tubes through which water flows. Water enters the 4-cm-diameter, 14-m-long tubes at 20°C at a rate of 0.8 kg/s. Deter...

Q: Cold air at 5°C enters a 12-cm-

Cold air at 5°C enters a 12-cm-diameter, 20-m-long isothermal pipe at a velocity of 2.5 m/s and leaves at 19°C. Estimate the surface temperature of the pipe.

Q: 100 kg/s of crude oil is heated from 20°

100 kg/s of crude oil is heated from 20°C to 40°C through the tube side of a multitube heat exchanger. The crude oil flow is divided evenly among all 100 tubes in the tube bundle. The ID of each tube...

Q: In an experiment, the local heat transfer over a flat plate

In an experiment, the local heat transfer over a flat plate was correlated in the form of the local Nusselt number as expressed by the following correlation Nux = 0.035Rex0.8Pr1/3 Determine the ratio...