Abstract
This work presents numerical investigation of the thermohydraulic performance of a wavy corrugated solar air heater design employing impinging circular air jet array. Geometrical parameters such as streamwise pitch to hydraulic diameter ratio (0.45 ≤ X/Dh ≤ 1.80), spanwise pitch to hydraulic diameter ratio (0.45 ≤ Y/Dh ≤ 1.80), jet diameter to hydraulic diameter ratio (0.06 ≤ D/Dh ≤ 0.18), duct height (0.021 m ≤ h ≤ 0.046 m), length of the duct (0.75 m ≤ L ≤ 2.25 m), and flow parameter, i.e., Reynolds number, (2000 ≤ Re ≤ 26,000) are considered for investigation. Output parameters, i.e., net power and least required outlet air temperature (≥ 40°C), are introduced. Numerical investigation presents the best thermohydraulic performance at X/Dh = 0.45, Y/Dh = 0.90, D/Dh = 0.06, and h = 0.021 m due to significant jet strength and interaction. Higher value of the Reynolds number, i.e., 18,000, is recommended to obtain effective air jet strength and high thermohydraulic performance for the present design. Moreover, the exiting air causes bending of the impinging air jets that lowers thermohydraulic performance. The maximum angle of jet deflection, 0 = 66°, is obtained at Re = 2000 and L = 2.25 m. Hence, the use of shorter collector length with impinging air jet array is strongly recommended.
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