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Correlations for Convective Heat Transfer

Nov 08 2010 01:20 PM | bspang in Heat Transfer ***** Share this topic:
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Section 8: Nucleate Pool Boiling

convection_24

Tw = temperature of heating surface

Ts = saturation temperature

Heat transfer at ambient pressure:

convection_eq_37(Stephan and Preuber)Eq. (37)

' saturated liquid

'' saturated vapor

Bubble departure diameter convection_25

Angle ?0 = ?/4 rad for water = 0.0175 rad for low-boiling liquids = 0.611 rad for other liquids

For water in the range of 0.5 bar < p < 20 bar and 104 W/m2 <convection_26< 106 W/m2 the following equation may be applied:

convection_eq_38(Fritz)Eq. (38)




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