Heat Transfer Enhancement in a Microtube with an In-Line Package of Spherical and Inclined Oval-Trench Dimples during Transformer-Oil Pumping

Autor:	A. G. Sudakov, Yu. V. Zhukova, A. D. Chornyi, S. A. Isaev, A. E. Usachov
Rok vydání:	2019
Předmět:	010302 applied physics Materials science Transformer oil Heat transfer enhancement Flow (psychology) General Engineering Laminar flow Condensed Matter Physics 01 natural sciences 010305 fluids & plasmas Physics::Fluid Dynamics Dimple 0103 physical sciences Trench Heat transfer Tube (container) Composite material
Zdroj:	High Temperature. 57:885-888
ISSN:	1608-3156 0018-151X
DOI:	10.1134/s0018151x19040096
Popis:	The vortex-induced intensification of the laminar (at Re = 308) flow of transformer oil and heat transfer in a microtube with an in-line package of dimples with a depth of 0.26 of the tube diameter is calculated based on the Navier–Stokes equations and the energy equation. The heat-transfer increased by nearly 20 times for eight inclined oval-trench dimples spaced around the circumference and by 13 times for spherical dimples equal in area in comparison with that for a smooth tube; moreover, the relative hydraulic losses grow by approximately 30 and 60%, respectively.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::17602cd3fdf6f64e274fd8d5886b6927 https://doi.org/10.1134/s0018151x19040096 Zobrazit plný text záznamu Plný text ve formátu PDF Plný text ve formátu HTML
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