Word Count : 340

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Dimensionless numbers are used in heat transfer and fluid flow to analyze and compare different physical situations without dependence on specific units. They represent ratios of important physical effects such as conduction, convection, inertia, and viscosity, and help in developing correlations for practical engineering problems. The Nusselt number is a measure of the enhancement of heat transfer through a fluid layer as a result of convection compared to ______ ___ ___ ________ _______ _________ ___ ________ ________.
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