Questions from Thermal Fluid Science

Q: A long iron rod (ρ = 7870 kg/m3,

A long iron rod (ρ = 7870 kg/m3, cp = 447 J/kg⋅K, k = 80.2 W/m⋅K, and α = 23.1 × 10−6 m2/s) with diameter...

Q: An 8-m-internal-diameter spherical tank made of

An 8-m-internal-diameter spherical tank made of 1.5-cm-thick stainless steel (k = 15 W/m⋅K) is used to store iced water at 0°C. The tank is located in a room whose tempera...

Q: An oil pump is drawing 44 kW of electric power while pumping

An oil pump is drawing 44 kW of electric power while pumping oil with ρ = 860 kg/m3 at a rate of 0.1 m3/s. The inlet and outlet diameters of the pipe are 8 cm and 12 cm, respectively. If th...

Q: A 2-cm-diameter plastic rod has a thermocouple inserted

A 2-cm-diameter plastic rod has a thermocouple inserted to measure temperature at the center of the rod. The plastic rod (ρ = 1190 kg/m3, cp = 1465 J/kg⋅K, and k = 0.19...

Q: The boiling temperature of nitrogen at atmospheric pressure at sea level (

The boiling temperature of nitrogen at atmospheric pressure at sea level (1 atm pressure) is −196°C. Therefore, nitrogen is commonly used in low-temperature scientific stu...

Q: A 65-kg beef carcass (k = 0.47

A 65-kg beef carcass (k = 0.47 W/m⋅K and α = 0.13 ×10−6 m2/s) initially at a uniform temperature of 37°C is to be cooled by re...

Q: Repeat Prob. 17–84 for liquid oxygen, which has

Repeat Prob. 17–84 for liquid oxygen, which has a boiling temperature of −183°C, a heat of vaporization of 213 kJ/kg, and a density of 1140 kg/m3 at 1 at...

Q: For which kinds of bodies made of the same material is the

For which kinds of bodies made of the same material is the lumped system analysis more likely to be applicable: slender ones or well-rounded ones of the same volume? Why?

Q: What is the critical radius of insulation? How is it defined

What is the critical radius of insulation? How is it defined for a cylindrical layer?

Q: A 30-cm-diameter, 4-m-high

A 30-cm-diameter, 4-m-high cylindrical column of a house made of concrete (k = 0.79 W/m⋅K, α = 5.94 × 10−7 m2/s, ρ = 1600 kg/m3, and cp = 0.84 kJ/kg⋅K) cooled to 14°C during a cold night is heated aga...