Numerical investigation of thermal and fluid analysis of the effect of flight altitude and porous metal foam on the oil cooler of training airplane

Document Type : Original Article

Authors

1 Department of aerosapce.Aerospace faculty.shahid sattari aeronautical university.Tehran.Iran

2 Department of aerospace. Aerospace faculty. shahid Sattari aeronautical University. Tehran. Iran

3 school of mechanical engineering,iran university of science and technology.Tehran,Iran

10.22034/joae.2023.348694.1105

Abstract

using porous metal foams is one of the conventional methods to increase heat transfer in industrial systems, including heat exchangers. Porous media increase heat transfer and lead to an increase in pressure drop.. In this paper, the three-dimensional effects of flight altitude (1000m<H<5000m) and porous metal foam with Darcy number(0.1<Da<0.0001) in a training airplane oil cooler were investigated. The porosity coefficient was assumed to be 0.9 for all cases with porous foam.The Darcy-Brinkman-Fortheim equation was used to simulate a 20 W50 oil flow in a porous medium. The thermophysical properties of the oil including density, viscosity and thermal conductivity were extracted using laboratory data in terms of operating temperature. Hot oil with boundary condition enters the oil cooler. The boundary condition of the output oil is . The cooling wall is the boundary condition of non-slip and the heat transfer coefficient of air movement is proportional to the height. The governing equations are discrete based on the finite volume method using commercial computational fluid dynamics FLUENT. With increasing flight altitude, in pure oil mode, heat transfer, pressure drop and performance evaluation criteria increase by 0.65%, 0.45% and 0.49%, respectively. Porous metal foam with Darcy number having leads to increase of Nusselt number , increase of pressure drop and has the highest performance evaluation criterion PEC=31.75. Porous metal foam with Darcy number has the highest pressure drop and the highest heat transfer increase . According to the obtained results, Darcy's number is the most optimal performance evaluation parameter.

Keywords

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References

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Journal of Aeronautical Engineering
Volume 25, Issue 2
September 2023
Pages 12-20

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History

  • Receive Date: 23 June 2022
  • Revise Date: 04 December 2022
  • Accept Date: 30 September 2023

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