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Since the fluid velocity associated with natural convection is relatively low, the heat transfer coefficient encountered in natural convection is also low
The rate of heat transfer depends upon the differences in temperature between the bodies, the greater the difference in temperature, the greater the rate of
The convective heat transfer coefficient (h) is dependent upon the physical properties of the fluid and the physical situation • For laminar flow, the
The value of a convection heat transfer coefficient depends upon the physical configuration as well as upon several properties of the fluid involved Empirical
The heat transfer coefficient is a function of the physical variables expressed below: From the table below, it can be seen that the value of h depends upon
The accuracy of these estimates, in tum, depends upon accurate estimates of the surface heat transfer coefficient for the cooling or freezing operation For
transfer, namely conduction, convection and radiation, conduction governs and consequently the heat transfer coefficient depends, in general, upon the