Abstract
Time dependent heat transfer in high Prandtl number free convection is studied in a Hele-Shaw slot with low heat conductivity side walls. Temperature fields are visualized by holographic interferometry. The time dependent Nusselt number is evaluated at the centreline of the slot from a time series of interferograms. The time dependent thermal boundary layer thickness δ reflects the oscillatory behaviour of the flow as well as the plume release process from the thermal boundary layers. The heat transfer analysis shows that unstable horizontal thermal boundary layers are the cause of time dependent high Prandtl number convection in Hele-Shaw slots.
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