Experimental and numerical investigation of natural convection in a discretely heated vertical channel: Effect of the blockage ratio of the heat sources

Sarper B., SAĞLAM M., AYDIN O.

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, vol.126, pp.894-910, 2018 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 126
  • Publication Date: 2018
  • Doi Number: 10.1016/j.ijheatmasstransfer.2018.05.089
  • Journal Name: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.894-910
  • Keywords: Natural convection, Vertical channel, Heat source array, Blockage ratio, Nusselt number, CONJUGATE MIXED CONVECTION, HORIZONTAL CHANNEL, MOUNTED OBSTACLES, FORCED-CONVECTION, LOWER WALLS, RECTANGULAR CHANNEL, SURFACE RADIATION, AIR, ARRAY, SIMULATION
  • Karadeniz Technical University Affiliated: Yes

Abstract

This study deals with the buoyancy induced flow and heat transfer in a parallel plate channel with a heat source array, which simulates an electronic package. The heat source array consists of four discrete protruding heat sources made of copper. The focus of this study is concentrated on the effect of heat source blockage ratio (b(r)) on recirculating flow and cooling performance of the system. Studies are conducted both for flush mounted or protruding heat source cases. Four different values of the blockage ratio of the protruding heat sources (b(r) = 0.125, 0.25, 0.375 and 0.5) are considered. The range of the modified Grashof number covers the values between 9.6 x 10(5) and 1.53 x 10(7). In the experiments, flow visualization and temperature measurements are conducted. Numerical studies are performed via ANSYS Fluent software. From the experimental results and numerical studies, it is found that buoyancy induced flow and cooling performance is significantly affected by the blockage ratio of the heat source array. (C) 2018 Elsevier Ltd. All rights reserved.