THERMAL SCIENCE

International Scientific Journal

Authors of this Paper

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Ilker Goktepeli

,

Ulas Atmaca

,

Sercan Yagmur

VISUALIZATION OF FLOW CHARACTERISTICS BETWEEN THE RIBBED PLATES VIA PARTICLE IMAGE VELOCIMETRY

ABSTRACT
Heat transfer is considerably influenced by flow stagnation, separation and reattachment regions due to the ribbed plates. Placing the ribs such as fins, turbulators that trigger the flow separation, enhances the heat transfer inside the channel by increasing the turbulence intensity. The flow separation is caused by disturbing the thermal and hydrodynamic development lengths. Moreover, these ribs also make an impact that increases the heat transfer by enlarging the heat transfer area. However, the ribs lead to the increment of the required pumping power in the meantime due to the increasing pressure loss in such systems. This aforementioned method is used for the heat exchangers, the solar collectors, the cooling of electronic devices. The investigation of the flow characteristics is very crucial to understand the heat transfer mechanism in the ducts for this reason. In the present paper, the flow characteristics between the plates have been experimentally re-searched. Particle image velocimetry system in the open water channel of Selcuk University Advanced Technology Research and Application Center has been used. The smooth plates have been taken as the reference model and used for the comparison with the plates having the rectangular cross-sectional ribs. The ribs with various heights of 0.1 ≤ h′ = h/H ≤ 0.3 have been symmetrically placed on the internal surfaces of the plates via several spacing values of 0.5 ≤ S′ = S/H ≤ 1 for varying Reynolds numbers as 10000 ≤ Re ≤ 20000. As a result, the flow characteristics have been given in terms of the contour graphics for velocity vector field, velocity components and vorticity.
KEYWORDS
flow separation, parallel plate, PIV, Reynolds number, rib, turbulent flow
PAPER SUBMITTED: 2018-07-27
PAPER REVISED: 2019-07-05
PAPER ACCEPTED: 2019-07-19
PUBLISHED ONLINE: 2019-08-10
DOI REFERENCE: https://doi.org/10.2298/TSCI180727300G
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 1, PAGES [171 - 179]
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Visualization of flow characteristics between the ribbed plates via particle image velocimetry

© 2024 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