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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

THERMAL PERFROMANCE OF COOLING CHANNELS WITH RIBARRAYS DETACHED FROM ONE WALL

Yanlin Ge
Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan, 430033, P. R. China; Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan, 430033, P. R. China; College of Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China

Zhihui Xie
Institute of Thermal Science and Power Engineering, Naval University of Engineering, Wuhan, 430033, P. R. China; Military Key Laboratory for Naval Ship Power Engineering, Naval University of Engineering, Wuhan, 430033, P. R. China; College of Power Engineering, Naval University of Engineering, Wuhan 430033, P. R. China

Sebastian Ruck
Karlsruhe Institute of Technology, Institute of Neutron Physics and Reactor Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

Benedikt Kaiser
Karlsruhe Institute of Technology, Institute of Neutron Physics and Reactor Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

Frederik Arbeiter
Karlsruhe Institute of Technology, Institute of Neutron Physics and Reactor Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany

Abstract

Detached Eddy Simulations were conducted for pressurized helium-gas flow in cooling channels with rib-arrays detached from one wall at a Reynolds number of Re = 1.05 × 105. Turbulent flow fields and conjugated heat transfer were predicted. The rib-arrays consisted of 60° (with respect to the centerline) V-shape or 90° transverse ribs with a rib-height of e and a square cross section. The clearance to the channel wall was c/e = 0.0, 0.1, 0.3 and 0.5, the cooling channel cross section was 15 e × 15 e, the rib-pitch-to-rib-height-ratio was p/e = 10 and the rib-height-to-hydraulic-diameter-ratio was e/Dh = 0.06532. Friction factors, Nusselt numbers and thermal performance were analyzed. An efficiency criterion and a thermal performance number were evolved for evaluating the thermal performance of rib-roughened cooling channels. It was shown, that for both types of detached rib-array configurations, the averaged heat transfer and the thermal performance deceased with increasing clearance. Maximum heat transfer and best thermal performance were provided by the 60° V-shape rib-configuration with c/e = 0.1.

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