Abstract
An experimental investigation of free convection in a two-dimensional rectangular open cavity (the Hele-Shaw cell) was carried out using an IR imager. The effect of Prandtl number and of the height of the working cavity on heat transfer at Rayleigh numbers varying from 4 × 102 to 108 was studied. Water, alcohol, and transformer oil were used as working liquids. The experiments were conducted with a constant density of heat flux at one of the end walls of the cavity and under isothermal conditions at the other. An increase in the mean Nusselt number for alcohol and transformer oil is observed in a rectangular cell and for water in a shallow cavity with an aspect ratio of 0.5. Correlations are obtained for the local and mean Nusselt numbers for the three liquids and different heights of the working cavity. Also presented are the values of dimensionless temperature and distribution of the local Nusselt number on the heated wall. The findings presented supplement the data obtained during a study of heat exchange in a rectangular cavity filled with a porous medium.
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