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concentric/tube in tube counter flow HX

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Old   May 24, 2010, 06:41
Default concentric/tube in tube counter flow HX
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I am simulating a concentric tube in tube counter flow HX. On the annualar side i have supercritical co2 and center tube - subcritical co2. I have problem in finding local heat transfer coefficient for both fluid channels. How i should define wall between two fluids?

Any one has a clue?
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