Question

Convective heat transfer coefficients for air under natural convection is __________

(a) 0.5 – 1000 (W/(m^2K))

(b) 50 – 3000 (W/(m^2K))

(c) 10 – 1000 (W/(m^2K))

(d) 50 – 10000 (W/(m^2K))

I got this question during an internship interview.

I would like to ask this question from Heat Convection topic in division Heat Transfer Theory of Food Processing Unit Operations

Answer 1

The correct option is (a) 0.5 – 1000 (W/(m^2K))

For explanation: Convective heat transfer coefficients for air under natural convection is 0.5 – 1000 (W/(m^2K)).  For liquids under natural convection is 50 – 3000 (W/(m^2K)). For air under forced convection it is 10 – 1000 (W/(m^2K)). For liquids under forced convection it is 50 – 10000 (W/(m^2K)).