Numerical investigation of fluid flow structure and heat transfer in a passage with continuous and truncated V-shaped ribs

Shian Li (Engineering Simulation and Aerospace Computing (ESAC), Northwestern Polytechnical University, Xi'an, China and Division of Heat Transfer, Lund University, Lund, Sweden)
Gongnan Xie (Engineering Simulation and Aerospace Computing (ESAC), Northwestern Polytechnical University, Xi'an, China)
Bengt Sunden (Division of Heat Transfer, Lund University, Lund, Sweden)

International Journal of Numerical Methods for Heat & Fluid Flow

ISSN: 0961-5539

Publication date: 5 January 2015

Abstract

Purpose

The employment of continuous ribs in a passage involves a noticeable pressure drop penalty, while other studies have shown that truncated ribs may provide a potential to reduce the pressure drop while keeping a significant heat transfer enhancement. The purpose of this paper is to perform computer-aided simulations of turbulent flow and heat transfer of a rectangular cooling passage with continuous or truncated 45-deg V-shaped ribs on opposite walls.

Design/methodology/approach

Computational fluid dynamics technique is used to study the fluid flow and heat transfer characteristics in a three-dimensional rectangular passage with continuous and truncated V-shaped ribs.

Findings

The inlet Reynolds number, based on the hydraulic diameter, is ranged from 12,000 to 60,000 and a low-Re k-e model is selected for the turbulent computations. The local flow structure and heat transfer in the internal cooling passages are presented and the thermal performances of the ribbed passages are compared. It is found that the passage with truncated V-shaped ribs on opposite walls provides nearly equivalent heat transfer enhancement with a lower (about 17 percent at high Reynolds number of 60,000) pressure loss compared to a passage with continuous V-shaped ribs or continuous transversal ribs.

Research limitations/implications

The fluid is incompressible with constant thermophysical properties and the flow is steady. The passage is stationary.

Practical implications

New and additional data will be helpful in the design of ribbed passages to achieve a good thermal performance.

Originality/value

The results imply that truncated V-shaped ribs are very effective in improving the thermal performance and thus are suggested to be applied in gas turbine blade internal cooling, especially at high velocity or Reynolds number.

Keywords

Acknowledgements

This work was supported by National Natural Science Foundation of China (11202164) and NPU Foundation for Fundamental Research (NPU-FFR-JC20130115). The authors also thank Dr Lei Wang at Lund University for his useful suggestions and experimental data.

Citation

Li, S., Xie, G. and Sunden, B. (2015), "Numerical investigation of fluid flow structure and heat transfer in a passage with continuous and truncated V-shaped ribs", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 25 No. 1, pp. 171-189. https://doi.org/10.1108/HFF-08-2013-0246

Publisher

:

Emerald Group Publishing Limited

Copyright © 2015, Emerald Group Publishing Limited

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

You may be able to access this content by logging in via Shibboleth, Open Athens or with your Emerald account.
To rent this content from Deepdyve, please click the button.
If you think you should have access to this content, click the button to contact our support team.