A 0.2 m x 0.2 m vertical plate has a surface temperature that is maintained at 40°C. Air at 20°C is flowing in parallel over the plate with a velocity of 0.4 m/s. a) Do we need to consider both the forced convection and free convection? b) Calculate the increase in heat transfer rate if the forced flow assists the free convection rather than opposes it.

A 0.2 m x 0.2 m vertical plate has a surface temperature that is maintained at 40°C. Air at 20°C is flowing in parallel over the plate with a velocity of 0.4 m/s. a) Do we need to consider both the forced convection and free convection? b) Calculate the increase in heat transfer rate if the forced flow assists the free convection rather than opposes it.

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.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.13P

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A 0.2 m x 0.2 m vertical plate has a surface temperature that is maintained at 40°C. Air at 20°C is flowing in parallel over the plate with a velocity of 0.4 m/s.

a) Do we need to consider both the forced convection and free convection?

b) Calculate the increase in heat transfer rate if the forced flow assists the free convection rather than opposes it.

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