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Detailed CFD Modelling of EMC Screens for Radio Base Stations: A Parametric Study
University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för energi- och maskinteknik. Department of Mechanical Engineering, TECNUN, University of Navarra, Navarra, Spain; Division of Applied Thermodynamics and Refrigeration, KTH Energy Technology, Royal Institute of Technology, Stockholm, Sweden.
University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för energi- och maskinteknik. Division of Applied Thermodynamics and Refrigeration, KTH Energy Technology, Royal Institute of Technology, Stockholm, Sweden.
University of Gävle, Department of Technology and Built Environment, Ämnesavdelningen för energi- och maskinteknik.ORCID iD: 0000-0003-3472-4210
2009 (English)In: IEEE transactions on components and packaging technologies (Print), ISSN 1521-3331, E-ISSN 1557-9972, Vol. 32, no 1, p. 145-155Article in journal (Refereed) Published
Abstract [en]

The objective of this paper is to make a parametric study of the hydraulic resistance and flow pattern of the flow after an electromagnetic compatibility screen and between two printed circuit boards (PCBs) in a model of a 90 degrees subrack cooling architecture. The parametric study is carried out using a detailed 3-D model of a PCB slot. The detailed model was experimentally validated in a previous paper by the authors. Seven parameters were investigated: velocity, inlet height, screen porosity, PCB thickness, distance between two PCBs, inlet-screen gap and screen thickness. A correlation for the static and dynamic pressure drop, the percentage of dimensionless wetted area, A(omega)*, and the RMS* factor (a function of the How uniformity along the PCB) after the screen is reported as a function of six geometrical dimensionless parameters and the Reynolds number. The correlations, that are based on 174 three dimensional simulations, yield good results for the total pressure drop, in which the values are predicted within the interval of +/- 15%. For the, A(omega)*, all the predicted values are within the interval of +/- 22% of the observed values. Finally, for the RMS* factor, the majority of the values also have a disagreement of less than 20% of the observed values. These last two parameters are believed to provide a correct insight about the flow pattern after the screen.

Place, publisher, year, edition, pages
2009. Vol. 32, no 1, p. 145-155
Keyword [en]
Electromagnetic compatibility (EMC) screen, flow pattern, k - epsilon, perforated plate, porosity, pressure drop, renormalization group (RNG), subrack, wetted area
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:hig:diva-10287DOI: 10.1109/TCAPT.2009.2013337ISI: 000263928700018Scopus ID: 2-s2.0-63049102684OAI: oai:DiVA.org:hig-10287DiVA, id: diva2:442544
Available from: 2011-09-21 Created: 2011-09-21 Last updated: 2018-03-13Bibliographically approved

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Jonsson, HansMoshfegh, Bahram

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