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Computational Thermal Sciences: An International Journal
ESCI SJR: 0.244 SNIP: 0.434 CiteScore™: 0.7

ISSN Druckformat: 1940-2503
ISSN Online: 1940-2554

Computational Thermal Sciences: An International Journal

DOI: 10.1615/ComputThermalScien.v2.i1.30
pages 33-42

NUMERICAL INVESTIGATION OF HEAT TRANSFER IN TALL ENCLOSURE WITH RIBBED WALLS

Viktor I. Terekhov
Kutateladze Institute of Thermophysics, Laboratory of Thermal and Gas Dynamics, Russian Academy of Sciences, Siberian Branch, 630090,1, Acad. Lavrent'ev Avenue, Novosibirsk, Russia; Novosibirsk State Technical University, K. Markx av., 20, Novosibirsk, 630073, Russia
Vladimir V. Terekhov
Kutateladze Institute of Thermophysics SB RAS, Lavrentiev av., 1, Novosibirsk, 630090, Russia; Novosibirsk State University, Pirogov st., 2, Novosibirsk, 630090, Russia

ABSTRAKT

The aim of the present work was to study numerically the flow and heat transfer in a vertical rectangular cavity with high-aspect-ratio H/L = 10. The vertical and horizontal walls were assumed isothermal and adiabatic, respectively. The main purpose was to examine the effect of' sidewall ribbing (rib height and number of ribs) on the coefficient of heat transfer across the cavity. The number of ribs was 0 to 40, and the rib height was l/L = 0÷0.4. The ribs, arranged either in the staggered or opposing order, were attached to the cold as well to the warm wall. Two types of ribs, perfectly conducting ribs and adiabatic ribs, were analyzed. The range of Rayleigh numbers, Ra= 103÷105, include both the regime of thermal conduction and the multicell convection regime. Full two-dimensional Navier-Stokes equations in the stream function-vorticity variables were solved. The calculations showed that for all rib heights examined the surface-average heat-transfer coefficient increases first, attains the maximum, and then decreases with rise in the number of ribs. The most pronounced heat-transfer intensification is observed for high ribs. No heat-transfer suppression for perfectly conducting ribs was found; for adiabatic ribs, the heat-transfer rate decreased by 30% compared to its value for the sidewalls without ribbing. This decrease is observed for small-height ribbing l/L ≈ 0.25 with rather small (comparable with the cavity width) rib-to-rib spacing.


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