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What is characteristic length Lc? What is the meaning of characteristic length in Nusselt number?
What is characteristic length Lc? What is the meaning of characteristic length in Nusselt number?
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The characteristic length is different for different case of problems.
The characteristic length in transient heat transfer problem is volume/area, whereas in convection problems it is length of flat plate for flow or flat plate case, diameter of pipe for internal flows, and diameter for flow over cylinders.