NUMERICAL INVESTIGATION OF NATURAL CONVECTION HEAT TRANSFER FROM HORIZONTAL CIRCULAR CYLINDER IN A VENTED ENCLOSURE FILLED WITH NANOFLUIDS

MOHAMMAD ALI, OMAR MOHAMMAD ALI; MATLOOB, BAN AWNI

doi:10.26682/sjuod.2018.20.1.1

	NUMERICAL INVESTIGATION OF NATURAL CONVECTION HEAT TRANSFER FROM HORIZONTAL CIRCULAR CYLINDER IN A VENTED ENCLOSURE FILLED WITH NANOFLUIDS
Pure and Engineering Sciences
Article 1, Volume 20, Issue 1, 2018, Pages 1-24 PDF (1.54 M)
DOI: 10.26682/sjuod.2018.20.1.1
Authors
OMAR MOHAMMAD ALI MOHAMMAD ALI¹; BAN AWNI MATLOOB²
¹Dept. of Refrigeration and Air Conditioning, Collage of Engineering,Technical Institute of Zakho, Kurdistan -Iraq
²Dept. of Mechanical, Collage of Engineering, Thermal and Power System, University of Mosul-Iraq.
Abstract
In this research, the natural convection heat transfer from the horizontal circular cylinder in a vented enclosure filled with nanofluid is investigated numerically. Governing equations settling in the vorticity-stream function formulation is inclusive in the numerical work, which transformed into fitted body coordinate system. The study covered the following ranges of Rayleigh number 104£Ra£106, nanofluid volume fraction 0£j£ 0.2, enclosure width 1.667£W/D£ 5, and opening size 0£O/W£1. The effect of Rayleigh number, nanofluid volume fraction, enclosure width, and opening size on the Nusselt number, flow patterns and isotherms were investigated. The result shows that the Nusselt number is proportional with Rayleigh number, opening size and volume fraction of nanofluid and inversely proportional with enclosure width. The isotherms and flow patterns display the temperature and flow behaviors with changing studied variables. The thickness of thermal boundary layer decreases with increasing Rayleigh number for each opening size, enclosure width and nanofluid volume fraction.

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