The characteristic dimensionless groups for heat transfer to a fluid flowing through a pipe in laminar flow are_______________?
Correct answer: D. Nu, Gz
- A. Re.Gz
- B. Nu, Pr
- C. Nu, Pr, Re
- D. Nu, Gz
Explanation
For laminar flow with developing thermal conditions, the Nusselt number is commonly correlated with the Graetz number, which combines Reynolds number, Prandtl number, and pipe length effects. Thus, Nu and Gz are the characteristic groups.
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