Correlations for Convective Heat Transfer

Nov 08 2010 01:20 PM | bspang in Heat Transfer

Section 5: Forced Convection Flow over a Flat Plate

All properties at mean film temperature .

Laminar boundary layer, constant wall temperature:

(Pohlhausen)

Eq. (31)

valid for Re_L < 2Â·10⁵, 0.6 < Pr < 10

Turbulent boundary layer along the whole plate, constant wall temperature:

(Petukhov)

Eq. (32)

Boundary layer with laminar-turbulent transition:

(Gnielinski)

Eq. (33)

Section 6: Natural Convection

All properties at convection_19 .

L = characteristic length (see below)

For ideal gases: convection_21 (temperature in K)

(Churchill, Thelen)

Eq. (34)

valid for 10^-4 < Gr Pr < 4Â·10¹⁴, 0.022 < Pr < 7640, and constant wall temperature.

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