The steady-state experiment using liquid crystal thermography has been conducted for the analysis of Nusselt number distribution over the absorber surface of solar air heater duct having a gap with the staggered arrangement in inclined rib geometry to recuperate its thermal performance. The heat transfer experiment is performed with uniform heat flux and thermo-chromic liquid crystal is utilized to show the temperature distribution profile over the ribbed surfaces of the rectangular duct of aspect ratio of 5. The colored pattern image of TLCs was acquired using a 3CCD camera and exported to a TIFF file format using frame grabbing SOFTWARE SAPERALT which was further processed to get HSI values. The flow parameters considered in this present investigation are Re, d/W, and g/e varied from 4000-12500,0.15-0.45 and 1-4 respectively. Experiments has been performed with fixed P/e, r/e, p′/P, a and e/Dh of 10, 2, 0.6, 60° and 0.0303 respectively. The influence of relative gap position and relative gap width on flow pattern has been analyzed. The maximum augmentation in Nu and f over the smooth duct was obtained as 4.01 and 4.28 times respectively at the optimum value of d/W = 0.35 and g/e = 2 under similar flow conditions. The maximum value of THPP obtained at d/W & g/e of 0.35 & 2 respectively and Reynolds number of 12445.
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