THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Sarah Nashee

,

Khudheyer S. Mushatet

PERFORMANCE STUDY ON TURBULENT HEAT TRANSFER USING RECTANGULAR AIR DUCT INTEGRATED WITH CONTINUOUS AND INTERMITTENT RIBS TURBULATORS

ABSTRACT
To continue the scientific path specialized in enhancing the thermal performance of thermal systems, several tests are carried out to improve the overall performance of a rectangular duct as air-flows through it. This study reports experimentally and numerically the heat transfer enhancement and overall performance of a rectangular air duct with various arrangement of continuous and intermittent ribs turbulators. The ribs are inserting in several array arrangements at a 90° relative to the direction of flow. Three ribs lengths s = 30 mm, 60 mm, and 150 mm employed with the several arrangements that’s tested in the current study, with the pitch ratios (p/e)= 5.0 and height ratios (e/H) = 0.330. These cases include: continuous ribs case, intermittent-continuous-intermittent ribs case, and intermittent-ribs. Reynolds number, is ranging from 10000 to 35000. The experimental work was performed by designed and fabricated test rig while the numerical work was performed in commercially ANSYS Fluent 17.2. the outcomes show that intermittent-ribs case offers the best overall performance for all tested velocities, its 1.54 for experimental study and 1.57 for numerical study at Re = 10000. Also, the highest friction fac¬tor values are found in intermittent-ribs case, it is found to be 0.082 in Re = 10000.
KEYWORDS
overall performance, intermittent ribs, continuous ribs, friction factor
PAPER SUBMITTED: 2024-04-30
PAPER REVISED: 2024-07-26
PAPER ACCEPTED: 2024-08-02
PUBLISHED ONLINE: 2024-10-12
DOI REFERENCE: https://doi.org/10.2298/TSCI240430214N
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2025, VOLUME 29, ISSUE Issue 2, PAGES [955 - 967]
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Performance study on turbulent heat transfer using rectangular air duct integrated with continuous and intermittent ribs turbulators

2025 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence