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- W4308149122 abstract "Artificial roughness in the form of ribs is a convenient method for the enhancement of heat transfer coefficient in a solar air heater. In the present paper, an indoor experimental examination of Nusselt number (Nu) and friction factor (f) characteristics of a Solar air heater using novel discrete double arc reverse form roughness bottom side of the absorber plate was carried out. The range for criterion, relative roughness pitch (p/e) of 6.67, relative roughness height (e/Dh) of 0.027, angle of arc (α) of 30°,45°, 60°, 75°, Reynolds number (Re) of 3000 to 14000, aspect ratio (W/H) of 8 were applied in between the laboratory test. It has been found that the performance of roughened solar air heater duct is better than the performance of a smooth duct for the range of roughness parameters investigated. Enhancement of heat transfer coefficient (h) was noticed 266% more than a smooth channel. Increments of Nusselt number (Nu) and friction factor (f) were found at 268% and 221% more than smooth channel respectively. Maximum thermal efficiency was found 137% more than a smooth channel. Thermo-hydraulic concepts have been used to identify the ideal design and operating conditions. Depending on the insolation, it has been discovered that systems running within a certain Reynolds number range operate better thermo-hydraulically. The range of Thermo-hydraulic performance (THP) improved along with the increment of the Reynolds number. At a relative roughness pitch (p/e) of 6.67, a relative roughness height of 0.027, along the angle of arc (α) of 60°, the highest improvement of Thermo-hydraulic performance (THP) was noticed 2.22." @default.
- W4308149122 created "2022-11-08" @default.
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- W4308149122 date "2023-01-01" @default.
- W4308149122 modified "2023-09-29" @default.
- W4308149122 title "Experimental investigation of heat transfer and flow analysis of artificially roughened solar air heater by using double arc reverse shaped roughness with gap on the absorber plate" @default.
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- W4308149122 doi "https://doi.org/10.1016/j.matpr.2022.10.180" @default.
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