Heat Transfer Coefficient of a circular water duct of rectangular cross section

AI Thread Summary
The discussion centers on calculating the heat transfer coefficient (HTC) for a rectangular duct that is curved in a circular shape. The original poster has found literature on straight ducts and circular cross-section coils but lacks specific resources for their unique configuration. They note that the curvature increases the HTC due to centrifugal forces creating a radial pressure gradient. Participants request clarification on the duct's design, including flow type and aspect ratio, to better assist with the inquiry. The conversation highlights the need for tailored analytical approaches in heat transfer calculations for complex geometries.
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TL;DR Summary
calculation of heat transfer coefficient for round curved square cross section water duct
Hello all, i hope you're having a nice day.

I have a question about analytical heat transfer coefficient (HTC) calculation/determination for a rectangular duct curved in a circle. I have found some literature on this topic and also found empirical equations for rectangular cross section straight water ducts/pipes heat transfer calculation based on dimensions of the duct and also some equations for circular cross section helical pipe coil HTC calculation [1]. But none for my specific problem. I know that with curvature of the pipe/duct, the HTC increases as a result of centrifugal forces inducing radial pressure gradient. Has any of you dealt with something similar in the past? If anyone has any experience or can recommend me some literature for my problem or help me in any other way I would be very grateful.

Best regards!

Gal Štempihar

[1] BERGMAN, Theodore L. Fundamentals of heat and mass transfer. John Wiley & Sons, 2011.
 
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Welcome to PF.

Sorry, can you upload a diagram of this pipe? (Use the "Attach files" link below the Edit window.) I'm having a hard time picturing a "circular water duct of rectangular cross section". Thanks.
 
Is the flow laminar or turbulent? What is the aspect ratio for the rectangular cross section? What is the radius of curvature of the channel?
 
berkeman said:
I'm having a hard time picturing a "circular water duct of rectangular cross section".
Take a length of rectangular tubing, then wrap it around a telephone pole.
(about 80%+ confidence in this description)

p.s. In use, you may want to remove the telephone pole.
 

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