THERMAL SCIENCE

International Scientific Journal

NUMERICAL STUDY OF LAMINAR FLOW IN A SUDDEN EXPANSION OBSTACLED CHANNEL

ABSTRACT
In the present work, a numerical study has been conducted to investigate the flow heat transfer through an obstacled sudden expansion channel. Rectangular adiabatic obstacles mounted behind the expansion region on the upper and lower wall of the channel used. The effects of obstacles length, obstacles thickness and number of obstacles on flow and thermal fields for different Reynolds number and expansion ratio examined. Three values of expansion ratio (ER) equal to 1.5, 1.75 and 2 were used. The choice of values of Reynolds number takes in consideration the symmetry state. The governing equations of continuity, momentum and energy discretized by using the finite difference formulation and the resulting algebraic equations solved by using Gauss-Seidle iteration method. The obtained results show that the obstacles have a considerable effect on dynamics of the flow and enhancement of heat transfer. In addition, it is found that the heat transfer is enhanced more as the obstacles thickness increases and this trend is decreased as the obstacles length increases.
KEYWORDS
PAPER SUBMITTED: 2012-10-29
PAPER REVISED: 2013-07-20
PAPER ACCEPTED: 2013-07-22
PUBLISHED ONLINE: 2013-08-17
DOI REFERENCE: https://doi.org/10.2298/TSCI121029105M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE 2, PAGES [657 - 668]
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