Heat Exchanger...TWO
Hi,
I am a new CFX user and the only version that I can use is CFX 5.5.1. I have posted a question on this forum last month with title: Heat exchanger. I received a number of replies but none of them seems to answer the question. I would be grateful if any one has a previous experience in simulation of heat exchanger condenser can help me on this. Please, see to the previous question on Wed, 22 Jun 2005, 5:09 p.m. for details. Below I show the reference case and CFX result for a heat exchanger tube; Design case as reference; Tube lenght is 8 m Tin=70'C Tout=85'C Tube Diameter is .02 m Wall Temperature (fixed) is 90'C CFX result; Tube lenght is 8 m Tin=70'C Tout=90'C Tube Diameter is .02 m Wall Temperature (fixed) is 90'C I noticed the fluid reaches the wall temperature before passing 1/3 of tube length which contradicts the design data. Is this reasonable result from CFX? Or I have made a mistake somewhere? I appreciate any help… |
Re: Heat Exchanger...TWO
Hi,
Sounds like you need to do some reading into wall heat transfer modelling. Have a look at some heat transfer validation studies (the CFX Community has some available for download) and textbooks - Turbulence Modelling for CFD by Wilcox is a good one. Glenn Horrocks |
Re: Heat Exchanger...TWO
Dear Glenn Horrocks,
Thank you for your advice and for previous reply, I have already covered the topic theoretically but the simulation results are a bit weird. I will try to find some previous studies. Thnaks Walid |
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