Numerical investigation of cutting edge effect on fluid flow and heat transfer for in-phase trapezoidal air channels
| Autor: | H.E. Fawaz, A.G. Gomaa, H.R. Rashed, M.F. Abd Rabbo, M.T.S. Badawy, R. Y. Sakr |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Aspect ratio 020209 energy 02 engineering and technology Boundary layer thickness 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics symbols.namesake Optics 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Fluid dynamics Engineering(all) business.industry General Engineering Reynolds number Mechanics Engineering (General). Civil engineering (General) Nusselt number Forced convection Vortex Heat transfer symbols TA1-2040 business |
| Zdroj: | Alexandria Engineering Journal, Vol 57, Iss 2, Pp 911-926 (2018) |
| ISSN: | 1110-0168 |
| DOI: | 10.1016/j.aej.2016.11.019 |
| Popis: | This work is concerned with the numerical investigations of heat transfer and friction factor penalty inside trapezoidal in-phase corrugated-plate air channels. The influence of the flow rate represented by Reynolds number (100–1000), corrugation aspect ratio (0.2–0.5) and cutting edge ratio (0–0.6) on the flow characteristics and heat transfer was investigated. By cutting the sharp edged corners for trapezoidal channel, the large lateral vortex of the triangular channel was gradually damped resulting in lower recirculation area, lower recirculation velocities and lower velocity gradients damping the high peaks of the shear stress observed in the triangular case resulting in lower isothermal friction factor. However, the mixing effect produced by the lateral vortex decreased with its damping, which led to less uniform temperature profile resulting in lower sharper wall temperature gradients with thicker boundary layer thickness, so lower values of the Nusselt number were obtained. New correlations were developed based on the present results to evaluate Nusselt number and friction factor as a function of Reynolds number, corrugation aspect ratio, relative spacing ratio and cutting edge ratio for different corrugation shapes. The predicted results are consistent with the numerical and experimental data and lie within ±10% deviation. Keywords: Forced convection, Trapezoidal duct, Corrugated channel, Heat exchanger |
| Databáze: | OpenAIRE |
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