Fluid Flow and Heat Transfer of Combined Forced and Natural Convection over Upward-Facing, Horizontal Heated Wedge Placed in Uniform Downward Flow of Forced Convection

• KITAMURA Kenzo

  Toyohashi Univ. of Tech., Dept. of Mechanical Engineering

• 光石 暁彦

  豊橋技術科学大学 機械工学系

• 大畑 亮祐

  豊橋技術科学大学大学院

• 山崎 慎司

  豊橋技術科学大学大学院

Bibliographic Information

Other Title

• 一様な鉛直下降流中に設置された水平上向き加熱くさびまわりの強制―自然共存対流の流動と伝熱

Abstract

Experimental investigations have been carried out on combined forced and natural convective flows induced around upward-facing, horizontal heated wedges placed in a uniform vertical downward flow of air. A keen interest was directed to the thermal instability of the laminar boundary layer flows over the wedge and its effect on the heat transfer from the wedges. For the sake of this, comprehensive flow visualization experiments and measurements of the local heat transfer coefficients have been conducted with the wedges of various angles θ from 180°(horizontal plate) to 0° (vertical plate). The results showed that longitudinal vortices appear over the wedges of 180°<θ<135° with increasing buoyancy force and they enhance the heat transfer from the wedges. While, a separation of the boundary layer occurs over the wedges of 110°<θ<0° and the heat transfer was deteriorated significantly. It is also found that the onsets of these thermal instabilities as well as the heat transfer variations are predicted well with the non-dimensional parameter (Gr_L^*/Re_L^2.5).

Journal

• TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B

  TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 79 (798), 199-213, 2013

  The Japan Society of Mechanical Engineers

Keywords

• Heat Transfer
• Combined Convection
• Thermal Instability
• Wedge Flow
• Flow Visualization

Details

• CRID: 1390282681239889664
• NII Article ID: 130003374739
• DOI: 10.1299/kikaib.79.199
• ISSN: 18848346
• ISSN: 03875016
• Web Site: https://www.jstage.jst.go.jp/article/kikaib/79/798/79_199/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed