Abstract
Both quantitative measurements and qualitative flow visualization are used to interpret local/ average natural convection heat transfer characteristics in vertical parallel plates, with a two-dimensional rectangular rib, under asymmetric isoflux heating. A statistical model of randomized block analysis is introduced to corroborate that the channel spacing varied in the present experiments has no significant effect on average heat transfer characteristics if convective heat flux is maintained constant. Although the range of local modified Rayleigh number studied is in the laminar regime for an equivalently heated flat plate, the heat transfer characteristics in the downstream region of obstruction are much like those in the turbulent regime. Therefore, two new Nu correlations for representing local characteristics in the downstream region of the rib and for evaluating average heat transfer performance have been proposed, respectively.
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