Promising dimple technologies of vortex heat and mass transfer enhancement in energy and microelectronics

Autor:	S. A. Isaev, S. V. Guvernyuk, N I Mikheev, D V Nikushchenko, A. G. Sudakov, I. A. Popov
Rok vydání:	2020
Předmět:	History Materials science Flow velocity Dimple Turbulence Mass transfer Heat transfer enhancement Heat transfer Radius Mechanics Computer Science Applications Education Vortex
Zdroj:	Journal of Physics: Conference Series. 1675:012004
ISSN:	1742-6596 1742-6588
Popis:	Turbulent separated air flow and heat transfer at the starting hydrodynamic length of the longitudinal section of the dimpled narrow channel (1 in height, 4 in width, and 84 in length) with inclined one-row oval-trench dimples (OTD) are calculated. Packages of 20 and 31 dimples are compared. Each dimple has a length of 4.5, a width of 1, a depth of 0.2, an edge rounding radius of 0.2, and an inclination angle of 45°. Re=6000 and is determined in terms of the flow velocity at the channel entrance. The effect of abnormal separated flow intensification and heat transfer enhancement in OTDs due to the dimple density is confirmed. (fx/fxpl)min=−4 and (Nu/Nupl)max=7.2. Relative heat transfer grows by a factor of 1.9 and relative hydraulic losses – by a factor of 1.6.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3f6bd892e654fef929dcf2c23452bd8d https://doi.org/10.1088/1742-6596/1675/1/012004 Zobrazit plný text záznamu