The paper describes a numerical algorithm for the solution of the steady-state Navier-Stokes equations in three dimensions for the problem of natural convection in a rectangular cavity as a result of differential side heating. Numerical results for two- and three-dimensional models are reported for a cavity filled with a low-Prandtl-number fluid. Supporting experiments using gallium as a working fluid are described. Measured temperatures are compared with predictions of the three-dimensional model. Agreement between data and predictions is only fair and reasons for the discrepancy are identified.
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