An experimental study on the equilibrium boundary layer subjected to favourable pressure gradient (Effect of pressure gradient on law of the wall)

• HIKITA Yudai

  Graduate School of Sciences and Technology for Innovation, Yamaguchi University

• SUZUKI Hiroki

  Graduate School of Sciences and Technology for Innovation, Yamaguchi University

• KAMEDA Takatsugu

  Department of Mechanical Engineering, Kindai University

• MOCHIZUKI Shinsuke

  Graduate School of Sciences and Technology for Innovation, Yamaguchi University

Bibliographic Information

Other Title

• 順圧力勾配下における平衡境界層の実験的研究（壁法則に対する圧力勾配の影響）

Abstract

Effect of favorable pressure gradient on the wall similarity in turbulent boundary layer has been investigated experimentally. An appropriately adjusted pressure gradient produces an equilibrium boundary layer of which momentum thickness Reynolds number is constant. The wall shear stress was measured by three methods, which are direct measurement, Preston tube and Sublayer plate. A modified log-law considered the effects of the inertia and pressure gradient terms in the boundary layer equation gives better representation for the mean velocity profile subjected to favorable pressure gradient at finite Reynolds number. The velocity scale u_s applied to the modified log-law representation seems to be more relevant for turbulent intensity profile as well as mean velocity profile.

Journal

• Transactions of the JSME (in Japanese)

  Transactions of the JSME (in Japanese) 87 (894), 20-00394-20-00394, 2021

  The Japan Society of Mechanical Engineers

Keywords

• Turbulent flow
• Boundary layer
• Law of the wall
• Log-law
• Favorable pressure gradient

Details

• CRID: 1390287297546284032
• NII Article ID: 130007991572
• DOI: 10.1299/transjsme.20-00394
• ISSN: 21879761
• Web Site: https://www.jstage.jst.go.jp/article/transjsme/87/894/87_20-00394/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed