2. Thermodynamics

Heat Transfer — Quiz

Test your understanding of heat transfer with 5 practice questions.

Practice Questions

Question 1

Which dimensionless number indicates the product of buoyancy to viscous forces and fluid property effects in natural convection (Rayleigh number Ra)?

Question 2

In transient conduction into a semi-infinite solid subject to a sudden surface temperature change, the thermal penetration depth δ is proportional to:

Question 3

A semi-infinite solid has a thermal diffusivity α=1.0×10^{-5}\,m^2/s. Estimate the penetration depth δ after t=400 s.

Question 4

For a cylindrical pipe insulated with a material of thermal conductivity k_i=0.04 W/(m·K) and facing external convection coefficient h=20 W/(m^2·K), the critical insulation radius r_crit is closest to:

Question 5

When modeling heat transfer through a flat wall of thickness L with internal convection coefficient h_i and external coefficient h_o, the thermal resistance network consists of: