Questions from Thermal Fluid Science

Q: Explain how the thermal contact resistance can be minimized.

Explain how the thermal contact resistance can be minimized.

Q: A geothermal pump is used to pump brine whose density is 1050

A geothermal pump is used to pump brine whose density is 1050 kg/m3 at a rate of 0.3 m3/s from a depth of 200 m. For a pump efficiency of 74 percent, determine the required power input to the pump. Di...

Q: What is the physical significance of the Biot number? Is the

What is the physical significance of the Biot number? Is the Biot number more likely to be larger for highly conducting solids or poorly conducting ones?

Q: Can we define the convection resistance for a unit surface area as

Can we define the convection resistance for a unit surface area as the inverse of the convection heat transfer coefficient?

Q: Consider a sphere and a cylinder of equal volume made of copper

Consider a sphere and a cylinder of equal volume made of copper. Both the sphere and the cylinder are initially at the same temperature and are exposed to convection in the same environment. Which do...

Q: A wall consists of two layers of insulation pressed against each other

A wall consists of two layers of insulation pressed against each other. Do we need to be concerned about the thermal contact resistance at the interface in a heat transfer analysis or can we just igno...

Q: In Betty Crocker’s Cookbook, it is stated that it takes 5

In Betty Crocker’s Cookbook, it is stated that it takes 5 h to roast a 14-lb stuffed turkey initially at 40°F in an oven maintained at 325°F. It is recommended that a meat thermometer be used to monit...

Q: A watermelon initially at 35°C is to be cooled by

A watermelon initially at 35°C is to be cooled by dropping it into a lake at 15°C. After 4 h and 40 min of cooling, the center temperature of the watermelon is measured to be 20°C. Treating the waterm...

Q: A plate consists of two thin metal layers pressed against each other

A plate consists of two thin metal layers pressed against each other. Do we need to be concerned about the thermal contact resistance at the interface in a heat transfer analysis or can we just ignore...

Q: Spherical glass beads coming out of a kiln are allowed to cool

Spherical glass beads coming out of a kiln are allowed to cool in a room temperature of 30°C. A glass bead with a diameter of 10 mm and an initial temperature of 400°C is allowed to cool for 3 min. If...