To reach the maximum heat exchange rate, if a fan is applied, should it be upward airflow or downward airflow? Need detail explanation. And what will the efficiency difference between upward and downward airflow.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter6: Forced Convection Over Exterior Surfaces
Section: Chapter Questions
Problem 6.39P
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To reach the maximum heat exchange rate, if a fan is applied, should it be upward airflow or downward airflow? Need detail explanation. And what will the efficiency difference between upward and downward airflow. 

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