Open AccessVortex heat transfer enhancement in the separated flow near structured dimpled surfaces
Author(s) -
С. А. Исаев,
И. А. Попов,
Н. И. Михеев,
S. V. Guvernyuk,
M. A. Zubin,
Д. В. Никущенко,
A. G. Sudakov
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2057/1/012002
Subject(s) - dimple , vortex , mechanics , turbulence , materials science , flow (mathematics) , heat transfer enhancement , optics , geometry , geology , physics , reynolds number , composite material , mathematics
The numerically discovered phenomena of abnormal enhancement of the separated flow in the inclined oval-trench dimple (OTD) and the flow acceleration in the dimpled narrow channel are substantiated experimentally. The analysis of turbulent flow around a deep OTD on the plate and on the channel wall show that within the inclination angle range from 25° to 85°, the pressure drop is seen between the zones of stagnation on the windward slope and of rarefaction in the place where a tornado-like vortex is generated. The velocity field measurements in the narrow channel with two rows of inclined OTDs at the inclination angles of ±45° and ±135° reveal that the shear flow with a maximum velocity in front of the dimple entrance is formed in the flow core. This maximum shear flow velocity exceeds the maximum velocity in the plane-parallel channel.