Air/Oil Heat exchanger with stainless steel pipe

[fredt]

I would appreciate if anyone can give me some guidance - especially an approximate overall heat transfer coefficient - for a simple heat exchanger comprising oil in plain stainless steel pipes cooled by air blown across them. Stainless steel is used because of corrosion. I am aware of its poor heat transfer but assumed the air/pipe interface would control the heat flow. This isn't my field so any assistance would be gratefully received.

Thanks

 

[25362]

You are right, the dominant resistance is on the air convection side. An approximate -quite low- overall heat transfer coefficient (OHTC) would be 0.15 W/(m².^oC).