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Old   August 28, 2009, 06:51
Default energy absorption instead generation
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Hello there,

I face ti very interesting thing. My problem is related to viscous dissipation. My job is 2d axisymmetric tube. The non-newtonian fluid is the flowing medium. The inlet temperature is 19C. The tube external wall is cooled by water (temp of 5 C). In the core of flow, where there is almost no velocity gradient, I can clearly see drop temperatures about 2C. In near wall region, there is heat generation, thus temperatures are more than 19C.
Could anybody please explain to me this strange artificial heat absorption. I cannot even mathematically imagine, how it is even possible.
many thanks!!
Honza
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Old   August 29, 2009, 14:11
Default viscous heating
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any idea, please!! ?? come on, guy. I do know..
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