Heat and fluid flow analysis of solar air heater duct roughened with saw-tooth shaped transverse rib
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Date
2017
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Punjab Agricultural University, Ludhiana
Abstract
In this investigation, the Nusselt number and friction factor characteristics have been
numerically studied for solar air heater duct roughened artificially with non-uniform crosssection
saw tooth rib. The investigation has been carried in 3-D using software ANSYS
Academic Research CFD. The parameters, relative roughness pitch, angle of saw-tooth rib,
relative roughness height and Reynolds number were varied from 4 to 30, 15° to 75°, 0.015 to
0.043 and 3000 to 15000 respectively . The turbulence model renormalization group (RNG)
k-ε was selected for analysis of roughened duct. Both, the Nusselt number and friction factor
have been found to be maximum at relative roughness pitch of 16, relative roughness height
of 0.043 and angle of saw-tooth of 45° and Reynolds number of 15000. The results have been
explained using contours of turbulent kinetic energy, turbulent dissipation rate, static
temperature and static pressure have also been plotted. Thermo-hydraulic performance was
found best at Reynolds number of 9000, relative roughness height of 0.043 and angle of sawtooth
of 45°.
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