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We experimentally and numerically investigated the generation of plumes froma local heat source (LHS) and studied the interaction of these plumes withcellular convective motion (CCM) in a rectangular cavity filled with siliconoil at a Prandtl number (Pr) of approximately two thousand. The LHS isgenerated using a 0.2-W green laser beam. A roll-type CCM is generated byvertically heating one side of the cavity. The CCM may lead to the formation ofan unusual spiral convective plume that resembles a vertical Archimedes spiral.A similar plume is obtained in a direct numerical simulation. We discuss thephysical mechanism for the formation of a spiral plume and the application ofthe results to mantle convection problems. We also estimate the Reynolds (Re)and Rayleigh (Ra) numbers and apply self-similarity theory to convection in theEarth's mantle. Spiral plumes can be used to interpret mantle tomographyresults over the last decade.

A Laboratory-Scale Experiment and a Numerical Simulation of Unusual Spiral Plumes in a High-Prandtl-number Fluid