Abstract
A numerical investigation is carried out to predict local and mean thermal-hydraulic characteristics in rib-roughened ducts. The Navier-Stokes, energy equations, and a low-Re number k-є turbulence model are solved. Two methods for determination of the Reynolds stresses: eddy viscosity model (EVM), and explicit algebraic stress model (EASM) are used. The numerical solution procedure uses a collocated grid, and the simple corrected (SIMPLEC) algorithm handles the pressure–velocity coupling. The computations are performed with the assumption of fully developed periodic conditions. The ribbed duct configuration is identical to the experimental setup with only one wall having ribs, rib to hydraulic diameter ratio equal to 0.1 (e/Dh=0.1), and pitch to rib height ratio of 9 (P/e=9). The Reynolds number is 30,000. The calculated mean and local thermal-hydraulic values are compared with these experimental data, and the prediction capabilities of the two turbulence models (EVM and EASM) are discussed in the chapter.
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