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research-article

Two-Dimensional Flow Passage through a Hot Ribbed Channel: Effect of First Rib Width

[+] Author and Article Information
Boudjema Omari

Theoretical and applied laboratory of fluid mechanics, Faculty of physics, University of science and Technology Houari Boumedienne - USTHB, Algiers, Algeria
omari.boudjema@gmail.com

Amina Mataoui

Theoretical and applied laboratory of fluid mechanics, Faculty of physics, University of science and Technology Houari Boumedienne - USTHB, Algiers, Algeria
amataoui@usthb.dz

Abdelaziz Salem

Theoretical and applied laboratory of fluid mechanics, Faculty of physics, University of science and Technology Houari Boumedienne - USTHB, Algiers, Algeria
salemabdelaziz@hotmail.com

1Corresponding author.

ASME doi:10.1115/1.4040277 History: Received July 12, 2017; Revised April 17, 2018

Abstract

This work investigates numerically by finite volume method, the forced convection through a channel roughened by seven heated ribs arranged transversely. These ribs of rectangular cross section have a blocking ratio H/h = 10 and pitch ratio 3. The modeling the problem parameters are Reynolds number, ranging from 5480 to 68500, and the width of the first rib ranging from 0.5h to 15h. The objective of this study is to look for the width of the first rib which induces the best heat transfer. The flow configurations of identical ribs from the first one generate a large eddy spreading along the top of the two first ribs, blocking the flow of the first cavity. The widening of the first rib may solve this problem. This flow configuration is required in several engineering applications necessitating the flow periodicity starting from the first cavity. The effect of the width of the first rib is highlighted by velocity, pressure, turbulent kinetic energy and temperature profiles. Nusselt number distributions confirm that the widening of the heated surface is not recommended for improving heat transfer in spite of flow periodicity in all cavities (roughness d-type). The best improvement in heat transfer of 18%, compared to a smooth wall is obtained for thinnest first rib of L1/h=0.5. However, this configuration provides a minor heat exchange at the first pitch and the second rib, which might be a disadvantage for the material structure.

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