Consider two cases involving parallel flow of dry air at V = 1.5 m/s, T=45°C, and atmospheric pressure over an isothermal plate atT = 20°C. In the first case, Rex, = 5 x 105, while in the second case the flow is tripped to a turbulent state at x = 0 m. At what x-location, in m, are the thermal boundary layer thicknesses of the two cases equal? What are the local heat fluxes, in W/m², at thislocation for the two cases?x =9jam9 turbII=iimW/m²W/m²

V = 1.5 m/sT∞ =45°CTs = 20°CRex,c = 5 × 105x = 0m To-Determine:- x = ____mqlam'' = ____ W/m2qturb''…

Answered: DO first case, Rex, = 5 × 10³, while in…

DO first case, Rex, = 5 × 10³, while in the second case the flow is tripped to a tu e the thermal boundary layer thicknesses of the two cases equal? What are wo cases? m

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.

Chapter5: Analysis Of Convection Heat Transfer

Section: Chapter Questions

Problem 5.25P

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Question

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Consider two cases involving parallel flow of dry air at V = 1.5 m/s, T=45°C, and atmospheric pressure over an isothermal plate at
T = 20°C. In the first case, Rex, = 5 x 105, while in the second case the flow is tripped to a turbulent state at x = 0 m. At what x
-location, in m, are the thermal boundary layer thicknesses of the two cases equal? What are the local heat fluxes, in W/m², at this
location for the two cases?
x =
9jam
9 turb
II
=
i
i
m
W/m²
W/m²

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