G. V. Kovalenko, V. I. Terekhov, A. A. Khalatov, “Flow regimes in a single dimple on the channel surface”, Prikl. Mekh. Tekh. Fiz., 2010, Volume 51, Issue 6,Pages <nobr>78

This article is cited in 34 papers

Flow regimes in a single dimple on the channel surface

G. V. Kovalenko^a, V. I. Terekhov^b, A. A. Khalatov^a

^a Institute of Engineering Thermophysics, National Academy of Sciences of Ukraine, Kiev, 03057, Ukraine
^b Kutateladze Institute of Thermophysics, Siberian Division, Russian Academy of Sciences Novosibirsk, 630090, Novosibirsk, Russia

Abstract: The boundaries of the domains of existence of flow regimes past single dimples made as spherical segments on a flat plate are determined with the use of available experimental results. Regimes of a diffuser-confuser flow, a horseshoe vortex, and a tornado-like vortex in the dimple are considered. Neither a horseshoe vortex nor a tornado-like vortex is observed in dimples with the relative depth smaller than 0.1. Transformations from the diffuser–confuser flow regime to the horseshoe vortex regime and from the horseshoe vortex flow to the tornado-like vortex flow are found to depend not only on the Reynolds number, but also on the relative depth of the spherical segment. Dependences for determining the boundaries of the regime existence domains are proposed, and parameters at which the experimental results can be generalized are given.

Keywords: dimple, vortex structures, horseshoe and tornado-like vortices, enhancement of heat transfer.

UDC: 536.53:533.6

Received: 23.10.2009