Abstract
Various engineering systems, such as those associated with crystal growth techniques or solar ponds, may be characterized by double-diffusive behavior induced by discrete heat sources. Due to the relevance of such systems, the objective of this study is to investigate double-diffusive convection induced by bottom heating with a finite, heated strip placed beneath a salt-stratified layer. Attention is focused on the formation and growth of converting regions in the salt-stratified fluid. Experimental and numerical results reveal that development of convective conditions is characterized by an interaction between Rayleigh-Bénard-type convection and longitudinal convective rolls formed by horizontal temperature gradients. Secondary flow is visualized and predicted to occur above the bottom convection cell. For relatively unstable combinations of the salt stratification and applied heat flux, a complicated interaction between chaotic, double-diffusive convection and a three-dimensional, gravity wave distribution are observed.
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