Is Nusselt number a constant? -- CFD Online Discussion Forums

November 13, 2002, 20:45	Is Nusselt number a constant?	#1
zhhuang Guest Posts: n/a	hi,everyone:All books on heat and mass transfer tell me the Nusselt number of the fully-developed laminar flow in a pipes is a constant;if the wall temperature is constant,the Nu=3.66;if the heat flux is constant,the Nu will be 4.36. firstly, I use the the periodic flow model to simulate the flow ,and the Nusselt is NOT a constant!when the wall temperture or the heat flux rise, the Nu will enlarge!!! who can tell me what should I do ? Anyone did this? thanks zhenhai

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