To read the full version of this content please select one of the options below:

Enhancement of heat transfer in a square channel by roughened surfaces in rib-elements and turbulent flow manipulation

Jian Liu (Department of Energy Sciences, Lund University, Lund, Sweden, and School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an, China)
Gongnan Xie (Department of Mechanical Engineering, Northwestern Polytechnical University, Xi’an, China)
Bengt Ake Sunden (Department of Energy Sciences, Lund University, Lund, Sweden)
Lei Wang (Department of Energy Sciences, Lund University, Lund, Sweden)
Martin Andersson (Department of Energy Sciences, Lund University, Lund, Sweden)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Article publication date: 3 July 2017

Abstract

Purpose

The purpose of this paper is to augment heat transfer rates of traditional rib-elements with minimal pressure drop penalties.

Design/methodology/approach

The novel geometries in the present research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. All turbulent fluid flow and heat transfer results are presented using computation fluid dynamics with a validated v2f turbulence closure model. Turbulent flow characteristics and heat transfer performances in square channels with improved ribbed structures are numerically analyzed in this research work.

Findings

Based on the results, it is found that rounded transition cylindrical ribs have a large advantage over the conventional ribs in both enhancing heat transfer and reducing pressure loss penalty. In addition, cylindrical ribs increase the flow impingement at the upstream of the ribs, which will effectively increase the high heat transfer areas. The design of rounded transition cylindrical ribs and grooves will be an effective way to improve heat transfer enhancement and overall thermal performance of internal channels within blade cooling.

Originality/value

The novel geometries in this research are conventional cylindrical ribs with rounded transitions to the adjacent flat surfaces and with modifications at their bases. The combination of cylindrical ribs and grooves to manipulate the turbulent flow.

Keywords

Acknowledgements

This work has been carried out at the School of Marine Science and Technology, Northwestern Polytechnical University and the Department of Energy Sciences at Lund University, Sweden. The research work was financially supported by the China Scholarship Council and Sweden Energy Agency.

Citation

Liu, J., Xie, G., Sunden, B.A., Wang, L. and Andersson, M. (2017), "Enhancement of heat transfer in a square channel by roughened surfaces in rib-elements and turbulent flow manipulation", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 27 No. 7, pp. 1571-1595. https://doi.org/10.1108/HFF-03-2016-0120

Publisher

:

Emerald Publishing Limited

Copyright © 2017, Emerald Publishing Limited