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Simulation of heat transfer to separation Air flow in a concentric pipe

Oon, CS and Al-Shamma'a, A and Kazi, SN and Chew, BT and Badarudin, A and Sadeghinezhad, E (2014) Simulation of heat transfer to separation Air flow in a concentric pipe. INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER, 57. pp. 48-52. ISSN 0735-1933

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Abstract

Flow separations occur in various engineering applications. Computational simulation by using standard k-ε turbulence model was performed to investigate numerically the characteristic of backward-facing step flow in a concentric configuration. This research is focused on the variation of Reynolds number, heat flux and step height in a fully developed turbulent air flow. The design consists of entrance tube, inner and outer tubes at the test section. The inner tube is placed along the entrance tube at the test section with an outer tube to form annular conduit. The entrance tube diameter was varied to create step height, s of 18.5 mm. The Reynolds number was set between 17050 and 44545 and heat flux was set between 719 W/m2 and 2098 W/m2 respectively. It is observed that the higher Reynolds number with step flow contribute to the enhancement of heat transfer. The reattachment point for q=719 W/m2 is observed at 0.542 m, which is the minimum surface temperature. The experimental data shows slightly lower distribution of surface temperature compared to simulation data. As for the same case in experimental result, the minimum surface temperature is obtained at 0.55 m. The difference between numerical and experimental result is 0.008 m. Finally, it can be inferred that utilizing the computational fluid dynamic package software, agreeable results could be obtained for the present research.

Keywords: Numerical Simulation; Heat Transfer; Turbulent Flow; Computational Fluid Dynamics; Backward Facing Step

Item Type: Article
Uncontrolled Keywords: 0913 Mechanical Engineering
Subjects: T Technology > TJ Mechanical engineering and machinery
Divisions: Built Environment
Publisher: PERGAMON-ELSEVIER SCIENCE LTD
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Date Deposited: 26 Oct 2015 10:17
Last Modified: 01 Nov 2015 00:50
DOI or Identification number: 10.1016/j.icheatmasstransfer.2014.07.008
URI: http://researchonline.ljmu.ac.uk/id/eprint/941

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