stanton number for heat transfer coefficent calculation

[bigJinxy1985]

Hi,

i'm currently trying to size a heat exchanger and have been using Kays and London as a reference book. i have come across a calculation for the heat transfer coefficient:
h = StGCp where St = the Stanton number, G = mass velocity and Cp = specific heat.

In the text book it shows that StPr 2/3 over Re (Reynolds number) graph and states that from calculation of the the Re, StPr 2/3 can be determined. it also states that the Stanton number can be determined from the graph, however does not explain how this number can be determined.

can anybody help!!1

p.s. is there another equation i can use to calculate the heat transfer coefficient as i need to calculate the overall heat transfer coefficient for the sizing equations

 

[IRstuff]

http://en.wikipedia.org/wiki/Stanton_number:

there are zillions of attempted correlations, one of which is here:

http://en.wikipedia.org/wiki/Heat_transfer_coefficient#Forced_convection

TTFN
faq731-376

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[bigJinxy1985]

Cheers i've managed to figure it out.

St can be found by reading teh StPr2/3 from the graph. this figure is the divided by the free flow frontal area (σ) of the surface to determine the value for St