The characteristics of laminar natural convection about a vertical plate with periodically changing surface temperature have been studied by the finite-difference method. The effects of the amplitude and period of the surface temperature oscillation on the instantaneous and time-average Nusselt numbers, temperature and velocity profiles are demonstrated by several examples. High amplitude and a large range of frequency of the oscillation were considered in these examples. The time-wise variation of the fluid temperature in the inner region adjacent to the surface produces back heat flow at high amplitude, high frequency, and at high local Grashof number.

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