The Dittus-Boelter equation for convective heat transfer [(i.e. h = 0.023 (K/D) (Re) 0.8 (Pr) 0.4] cannot be used for
A)Low Reynold's number
B)Very low Grashoff number
C)Molten metals
D)All (A), (B) and (C)

Question

Quizplus · Accepted Answer

The Dittus-Boelter equation is valid for high Reynolds numbers (Re > 10,000) and moderate Prandtl numbers (0.7 < Pr < 100). It is not applicable for low Reynolds numbers, very low Grashoff numbers, or molten metals.

The Dittus-Boelter Equation for Convective Heat Transfer [(I