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- W3034352038 abstract "The work presented here reveals several interesting conclusions about flow and heat transfer in a channel with injection at one wall. At low-blowing Reynolds numbers, the streamwise velocity profiles resemble Poiseuille flow. As the blowing increases, the profiles become more skewed with reduced velocity gradients at the injected wall. The pressure gradients along the channel decrease almost linearly with length, which reflects the increased pressure drop required to accelerate the injected fluid to the continually increasing velocities required by mass conservation. The constant property assumption used in this work allows the momentum and mass conservation equations to be solved independently of the energy equation. Similarity solutions to the boundary-layer approximation of the energy equation with viscous dissipation neglected were found for several values of the Reynolds and Peclet numbers. The effects of Reynolds number on these solutions are not strong. However, very significant effects of the Peclet numbers are found. At Peclet numbers much less than unity ordinary conduction effects dominate and the temperature profile was found to be linear across the channel. As blowing increases, the profiles become increasingly nonlinear, with the temperature gradients (heat transfer rates) at the blown wall becoming smaller. This behavior is similar to that of a boundary layer on a transpiration cooled wall. For Peclet numbers greater than 3, the conduction to the blown wall is small. The opposite behavior occurs at the impermeable wall where heat transfer rates continually increase with increased blowing. These results can be used to approximate the transfer processes in thermal protection systems using a wick containing an evaporation material. The results show that high-evaporation rates can reduce heating of the substructure. Further, the increased convection at the upper wall can also be effective at reducing radiative heat transfer to the wick." @default.
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- W3034352038 date "1990-01-01" @default.
- W3034352038 modified "2023-09-23" @default.
- W3034352038 title "Experimental study of natural convection in horizontal porous layers with multiple heat sources" @default.
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