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MODELING OF FLOW PATTERNS AND CONVECTIVE HEAT TRANSFER IN AN INTERMITTENT IMPINGING SPRAY

DOI: 10.1615/ICHMT.2012.CHT-12.630
pages 1025-1045

Maksim A. Pakhomov
Kutateladze Institute of Thermophysics, Laboratory of Thermal and Gas Dynamics, Russian Academy of Sciences, Siberian Branch, Lavrent'ev Avenue, 1, 630090, Novosibirsk, Russia

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

Abstract

The flow structure and heat transfer of an intermittent impinging mist jet with low mass concentration of droplets (not more than 1 %) is studied numerically. In the range of small distances between the tube edge cross-section and target H/(2R) ≤ 4 the heat transfer rate at stagnation point increases with a rise of pulse frequency, whereas at high distances H/(2R) > 6 frequency rise causes heat transfer reduction. In the range 5 < H/(2R) < 6 it is revealed no effect of jet unsteadiness on heat transfer. Heat transfer intensity during flow pulse action increases and exceeds significantly the corresponding value for the steady-state case. When there is no flow, the value of Nusselt number decreases considerably. Results of the numerical modeling are compared with available data of other authors, and satisfactory agreement is obtained for the influence of pulse frequency on heat transfer of the gas jet with impinging surface.

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