| Autor: |
Mabrouk, A. Ben, Djemel, H., Hammami, M., Baccar, M. |
| Předmět: |
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| Zdroj: |
Heat & Mass Transfer; Jan2023, Vol. 59 Issue 1, p1-20, 20p |
| Abstrakt: |
This research presents a numerical modeling of the turbulent flow characteristics and thermal behavior in convex and concave curved solar air heater duct having a curved flow passage. The governing equations were solved using the computational fluid dynamics software (Ansys Fluent 15.0). The RNG k–ɛ turbulence model has been used for modeling turbulent flow. Different geometric and operating parameters such as curvature angle (θ ) value in the range of 15°–90°, Reynolds number (Re) between 3,800 and 18,000 and insertion of semi-circular artificial roughness were considered. The effects of these parameters on Nusselt number (Nuc), friction factor (frc), thermal performance ( ε th ) and thermo-hydraulic performance parameter (THPP) were studied. Then, the optimum configuration of the curvature angle for smooth and roughened curved solar air heater was evaluated. For smooth design, there was a heat transfer enhancement when higher values for the curvature angle were used accompanied by increase of the friction losses. Moreover, the maximum thermal performance values were more enhanced with convex curved flow passage basically for low curvature angle values as compared to concave flow passage. The best Thermo-Hydraulic Performance Parameters (THPP) for smooth curved solar air heater were computed to be 2.07 and 1.45 respectively for convex curvature angle θ = 30 ∘ and concave curvature angle θ = 15 ∘ with Re = 3,800. This above optimum value of concave design was improved by 20% using artificial semi-circular ribs while in convex design the optimum THPP was grown by 7.24%. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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