Heat-transfer Questions Set 31:
What is the geometric factor for infinitely long concentric cylinders?
Solution:
What type of heat exchanger is an automobile radiator?
Solution:
Two radiating surfaces A1 = 8 m² and A2 = 9 m² have shape factor F12 = 0.2. Then the shape factor F21 will be:
Solution:
A bubble of radius r will grow if the following condition is met:
Solution:
If the heat transfer rate is 700 kJ/s and the enthalpy of evaporation is 2257 kJ/kg, then find the rate of evaporation of water.
Solution:
In the case of a fin attached to a heated surface, which portion of the fin is the most effective for heat dissipation?
Solution:
A solid copper hemisphere of radius 2.5 m initially at 390°C is kept in air at 35°C. Find the temperature of the hemisphere after 18 hours.
Given:
h = 10 W/m²·K
For copper: ρ = 9000 kg/m³, K = 400 W/m·K, and C = 400 J/kg·K
Solution:
The Biot number is a dimensionless number used to assess the applicability of the lumped capacity model to a particular system. For larger Biot numbers, it can be said that the convective resistance dominates over the conductive resistance.
Solution:
What is heat transfer?
Solution:
An oil cooler in a high-performance engine has an outside surface area of 0.12 m² and a surface temperature of 65°C. At any intermediate time, air moves over the surface of the cooler at a temperature of 30°C and gives rise to a surface coefficient of 45.4 W/m²·K. Find the heat transfer rate.
Solution:
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