Reproduction of behavior of 2-D channel flow with two rods by using k-ε model

Masaaki Satake, Kazuhisa Yuki, Hidetoshi Hashizume

Research output: Contribution to journalArticlepeer-review

Abstract

In a liquid blanket system, MHD effect or low heat-transfer property of high Prandtl number fluid makes it difficult to remove high heat load, therefore utilization of ducts with inserted rods or sphere-packed pipes has been proposed to enhance the heat transfer. It is important to reveal influence of arrangement of the rods or spheres upon the heat transfer characteristics. In this study, the influence of a distance between two rods in wall-normal and streamwise directions upon the flow structures is clarified by numerical simulation. When the rod is approaching to another rod in the wall-normal direction, Karman's vortex street is disrupted. On the other hand, the distance between the rod and the wall is shorter than a certain value, a separation occurs on the wall and then the separation position does not move when the distance is much smaller than that value. Moreover, the pressure drop depends on the distance between two rods, and then there exists the minimum pressure drop. When the distance between the two rods becomes shorter in the streamwise direction, the wake behind the upstream rod changes from Karman 's vortex street to twin vortexes and the pressure drop decreases. The turbulent kinetic energy near the wall in case of Karman 's vortex street, which is generated by the upstream rod, is higher than that in case of twin vortex.

Original languageEnglish
Pages (from-to)821-828
Number of pages8
JournalFusion Science and Technology
Volume52
Issue number4
DOIs
Publication statusPublished - 2007 Nov

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

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