A CFD Based Analysis of Solar Air Heater Having V-Shaped Perforated Blocks on Absorber Plate

In this article a numerical investigation is conducted to analyze the 3-dimensional incompressible Navier–Stokes flows through the artificially roughened solar air heater for the Reynolds number ranges from 2000 to 20,000, the effect of geometrical parameters of the V-shaped perforated blocks on heat transfer and flow characteristics of rectangular duct, has been investigated. The governing equations are solved with a finite-volume-based numerical method. The commercial finite-volume based CFD code ANSYS FLUENT 14 is used to simulate turbulent airflow through artificially roughened solar air heater. The RNG k–ε turbulence model is used to solve the transport equations for turbulent flow energy and dissipation rate. The investigation encompassed the geometrical parameter namely, relative blockage height (e/H) of 0.4–1.0, relative pitch ratio (P/e) of 4–12 and open area ratio (β) of 5–25% at a fixed angle of attack (α) of 600. The maximum enhancement in Nusselt and friction factor has been found to be 6.38 and 13.96 times to that of smooth duct, respectively.

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