Thermo-hydraulic performance analysis of a solar air heater roughened with reverse NACA profile ribs
Applied Thermal Engineering（2020）
Abstract
•Numerical and experimental investigations are done using reverse NACA profile ribs.•Optimum results are found with airfoil shaped ribs having chord length of 15 mm.•Nusselt number increased by 98–193% and friction factor increased by 55–65%.•Maximum Nusselt number and THPP were found to be 104.45 and 2.53 respectively.•Empirical correlations have predicted Nu and f within ±3% of experimental values.
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Key words
Airfoil,Friction factor,Heat transfer,Nusselt number,Solar air heater
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