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NUMERICAL INVESTIGATION OF FLOW BEHAVIOUR OF AN IMPINGING JET IN A CROSS-FLOW ON A WALL MOUNTED CUBE USING RSM AND v2-f TURBULENCE MODELS

D. Rundstrom
Division of Energy and Mechanical Engineering, Department of Technology and Built Environment, University of Gävle, Gävle; and Department of Mechanical Engineering, Linköping Institute of Technology, Linköping, Sweden

B. Moshfegh
Division of Energy and Mechanical Engineering, Department of Technology and Built Environment, University of Gävle, Gävle; and Department of Mechanical Engineering, Linköping Institute of Technology, Linköping, Sweden

Abstract

The current trends towards the greater functionality of electronic devices are resulting in a steady increase in the amount of heat dissipated from electronic components. Forced channel flow is frequently used to remove heat from the walls of the channel where a PCB with a few high heat-dissipating components is located. The overall cooling strategy thus must not only match the overall power dissipation load, but also address the requirements of the "hot" components. In combating the whole thermal load with forced channel flow, excessive flow rates will be required. The aim of the present study is to investigate if targeted cooling systems in combination will low-velocity channel flow can improve the thermal performance of the systems.
The objective of this study is to investigate the possibility to predict the mean velocity field and the turbulence characteristics with two different RANS turbulence models, i.e. the v2-fmodel and a Reynolds-Stress-Model (RSM) with a two-layer model in the near-wall region. The geometrical case is a channel with a cube in the middle of the base plate and two inlets, one horizontal channel flow and one vertical impinging jet above the cube.
The numerical predictions are validated against a PIV-measurement with identical geometrical and flow set-up. The time average velocity components and the Reynolds stresses are compared at different positions in the domain.