Heat transfer and friction factor correlations for a solar air heater duct roughened artificially with V-ribs with symmetrical gaps
作者： Rajesh Maithani , J.S. Saini
DOI: 10.1016/J.EXPTHERMFLUSCI.2015.09.010
关键词: Angle of attack 、 Heat transfer 、 Duct (flow) 、 Surface finish 、 Reynolds number 、 Heat transfer coefficient 、 Mechanics 、 Optics 、 Nusselt number 、 Materials science 、 Turbulence
摘要: Abstract An experimental study has been carried out for enhancement of heat transfer coefficient a solar air heater having roughened duct artificially in the form V-ribs with symmetrical gaps as turbulence promoter. In present work an investigation and friction artificial roughness were investigated. The encompassed Reynolds number (Re) ranging from 4000 to 18,000, Number (Ng) values 1–5, relative gap width (g/e) pitch (P/e) 6–12, angle attack (α) range 30–75° height (e/D) 0.043. For Nusselt (Nu), maximum order 3.6 times that smooth obtained, similarly factor (f) also increases by 3.67 folds duct. rib parameters corresponding increase Nu f Ng = 3, g/e = 4, P/e = 10 α = 60°. Based on data, correlations have developed function flow number.
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