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Convective Heat Transfer Coefficient (HTC)
ƒ Based on wall functions
(Tw − TP )ρ c p C µ 4 k P 2
1
∗
T ≡
1
q& ′′
1
h = q" /(Tw − TP ) =
Pr y ∗

=  1

∗
Prt  κ ln Ey + P 

 
( )
(y
(y
∗
∗
< yT∗
> yT∗
)
)
1
ρ c pCµ 4 k P 2
T*
• This requires only to run turbulence equations
• The heat flux is q” is the convective flux only
• It would be equivalent to using the adjacent cell as reference temperature in the fluxbased HTC
• Generally, for accurate h, we want TP to be close to the bulk temperature
• This can be achieved only if y+ is large
Tbulk
Tbulk
TP
Tw
Tw
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TP