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发表于 2004-5-21 03:50:29
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来自 美国
回复: 【讨论】强制对流换热中壁面温度对对流换热系数的影响
chenyhappy:
I am so happy that you are the first guy in this section of Simwe forum brought out the right way to calculate convection coefficient (h) value. The first way you tried is the right way. The second way, when you used some relationship between Nu 数, Re 数, and Pr数, that relationship is derived from other equations in which engergy equation is included (Temperature is there. ). That temperature dissappears from the relationship you used doesn't mean it doesn't affect h value.
As for the difference, don't worry. The characteristic length, the order of Pr, Re, will introduce error.
So, don't feel puzzle. It's not your fault. In most heat transfer book written by chinese, you won't find the derivation process. Be confident on the first way. It is the right way.
jnjl:
chenyhappy didn't mess up the concept of h and k.
Good luck. |
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