Abstract
In this study, effects on mixed convection heat transfer of oscillation parameters on a vertical flat plate surface subjected to constant heat flux are experimentally and numerically investigated. The experimental setup includes a hanger–pulley system installed above a transparent enclosure contain a moving experimental model, flywheel-motor assembly generating the oscillating movement of the experimental model, power supply, and datalogger. The experimental model comprises two copper plates with attached thermocouples and Kapton heaters placed between the plates. In the study, heat flux applied to surface of the plates (q″), the Womersley number (Wo) and dimensionless oscillation amplitude (Ao) are varied. The effects of these parameters on the heat transfer performance are analyzed. This study is numerically solved using a control-volume based Computational Fluid Dynamics solver based on experimental data. The numerical results are compared with the experimental results and open literature. Instantaneous velocity and temperature profiles on the plate are obtained to explain the heat transfer mechanism. According to the numerical and experimental results, heat transfer performance is significantly affected by oscillation parameters and heat flux applied to the plate surface. The mixed convection heat transfer increases with the increase in oscillation parameters for all tested heat fluxes. The obtained results are presented as a function of dimensionless numbers.
Highlights
External flows on flat surfaces have an important role in heat-transfer applications
The experimental and numerical results obtained in this study are compared with the approach taken by Acrivos [38], results of the theoretical study conducted by Gomaa and Taweel [23], and experimental results of Prasad and Ramanathan [39] for mixed convection, at Reω = 4000, and Prandtl number (Pr) = 0.72 (Fig. 7)
The effects of the heat flux applied to the plate surface as well as those of oscillation amplitude and frequency on heat transfer are analyzed
Summary
External flows on flat surfaces have an important role in heat-transfer applications. In this study, the effects of mixed convection heat transfer on the oscillating vertical plate were numerically and experimentally examined for a wide range of oscillation amplitudes and frequencies. Because of the high heat fluxes, natural convection effects are more dominant on the plate surface.The maximum heat transfer performance improvement of 45% was observed at a high amplitude (Ao = 1.4) and a high frequency (Wo = 146) for q′′ = 250 W/m2.
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