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ThesisItem Restricted Design of a cooling system for poultry in hot weather(College of Agricultural Engineering PAU - Ludhiana, 1976) Sushil Kuamr, Kamra; A. P, BhatnagarThesisItem Open Access Design of an opn shelter for cooling of buffaloes in hot-Weather(College of Agricultural Engineering PAU - Ludhiana, 1975) Satija, Ramesh Chander; Srivastava, R. KThesisItem Open Access Design and fabrication of a gadget for measuring forword speed of the tractor(Punjab Agricultural University, Ludhiana, 1974) Raj, Dev; Kohli, R. NThesisItem Open Access Design, fabrication and testing of a seed metering device for pre gerninated paddy(Punjab Agricultural University, Ludhiana, 1974) Kuamr, Raj; Kaur, R. NThesisItem Open Access Sprinkler Irrigation(Punjab Agricultural University, Ludhiana, 1970) Chawla, Gagdish Kuamr; Bondurant, Byron LThesisItem Open Access Heat and fluid flow analysis of solar air heater duct roughened with saw-tooth shaped transverse rib(Punjab Agricultural University, Ludhiana, 2017) Amritpal Singh; Sukhmeet SinghIn 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°.