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Cooling of a heating cylinder by confined impacting air jets

Cooling of a heating cylinder by confined impacting air jets PurposeThe purpose of this paper is to investigate a new cooling process of a heated cylinder with confined impacting air jet.Design/methodology/approachTo do this the authors used experience-numerical and numerical-numerical comparisons. The experimental facility, designed and built at the Pau University, consists in air jets impacting around a heated circular cylinder. As the inlet velocity magnitude is low (Vin=4.37 m/s – Machin=0.0125), using a compressible solver for numerical simulations presents a number of difficulties. For this low Mach number configuration, the authors compare the performance of three different solvers in this paper. Two of them are compressible, one based on the finite volume approach and the other on a discontinuous Galerkin method, and the third one is an incompressible solver. Some of the numerical results are compared to experimental data.FindingsComparisons between the results from 3D and 2D computations support the relevance of 2D models. Some of the numerical results are compared to experimental data.Research limitations/implicationsThe confined aspect of the set-up reduces experimental measurement to intrusive measures. It should be noted that the temperature measurement given by thermocouples is always considered as “global” or “average”.Originality/valueFuture aircraft technology will increasingly rely on electrical power. The substitution of mechanical energy by electrical energy will lead to an increasing amount of heat power that need be evacuated. Innovative cooling processes have to be set up according to constraints imposed by the technological design. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png international Journal of Numerical Methods for Heat & Fluid Flow Emerald Publishing

Cooling of a heating cylinder by confined impacting air jets

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Publisher
Emerald Publishing
Copyright
Copyright © Emerald Group Publishing Limited
ISSN
0961-5539
DOI
10.1108/HFF-10-2015-0415
Publisher site
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Abstract

PurposeThe purpose of this paper is to investigate a new cooling process of a heated cylinder with confined impacting air jet.Design/methodology/approachTo do this the authors used experience-numerical and numerical-numerical comparisons. The experimental facility, designed and built at the Pau University, consists in air jets impacting around a heated circular cylinder. As the inlet velocity magnitude is low (Vin=4.37 m/s – Machin=0.0125), using a compressible solver for numerical simulations presents a number of difficulties. For this low Mach number configuration, the authors compare the performance of three different solvers in this paper. Two of them are compressible, one based on the finite volume approach and the other on a discontinuous Galerkin method, and the third one is an incompressible solver. Some of the numerical results are compared to experimental data.FindingsComparisons between the results from 3D and 2D computations support the relevance of 2D models. Some of the numerical results are compared to experimental data.Research limitations/implicationsThe confined aspect of the set-up reduces experimental measurement to intrusive measures. It should be noted that the temperature measurement given by thermocouples is always considered as “global” or “average”.Originality/valueFuture aircraft technology will increasingly rely on electrical power. The substitution of mechanical energy by electrical energy will lead to an increasing amount of heat power that need be evacuated. Innovative cooling processes have to be set up according to constraints imposed by the technological design.

Journal

international Journal of Numerical Methods for Heat & Fluid Flow – Emerald Publishing

Published: Sep 5, 2016

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