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2000 Fiscal Year Final Research Report Summary

Characteristics of Liquid Film Flowing around a Horizontal Circular Cylinder

Research Project

Project/Area Number 11650185
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionOSAKA CITY UNIVERSITY

Principal Investigator

KATOH Kenji  Department of Mechanical Engineering, Osaka City University, Associate Professor, 工学部, 助教授 (10177438)

Co-Investigator(Kenkyū-buntansha) AZUMA Tsuneo  Department of Mechanical Engineering, Osaka City University, Professor, 工学部, 教授 (40047329)
Project Period (FY) 1999 – 2000
KeywordsLiquid Film Flow / Wave / Horizontal Circular Cylinder / Centrifugal Force / Surface Tension / Separation
Research Abstract

When the liquid film flows around the sidewall of horizontal circular cylinder, the standing wave with its peak line in the circumferencial direction is observed on the film surface. The amplitude grows downstream and finally a part of wave separates from the film flow. A theoretical and experimental study was conducted to investigate such behavior of the standing wave.
At the position of wave occurrence, the resultant of centrifugal force, gravitational force, surface tension and viscous force is considered to be balanced on the wave. This dynamic balance leads an equation for the wave length. The wave length obtained from the theory agrees well with experiment. Since the liquid film is accelerated downstream and the centrifugal force becomes greater, the above forces no longer balance each other, which causes the amplification of the standing wave. The momentum equation considering the force balance on the wave amplitude was derived to determine the amplification rate. The amplificati … More on is dependent mainly on the inertial and gravitational forces and not on the surface tension. The wave profiles calculated numerically roughly agreed with those measured by the needle contact method. Next, a theoretical model was proposed to represent the mechanism of the wave separation. The flow rate inside the wave peak increases as the wave amplitude grows. The increment of the flow rate is supplied from the surrounding wave trough. The liquid in the wave trough is turned normal to the wall at the root of wave peak and is supplied inside the wave. The momentum normal to the wall would be given by the resultant of centrifugal force, gravitational force and surface tension acting on the wave root. When the wave is amplified to some critical value, the resultant cannot supply enough amount of liquid to maintain the wave amplification and a part of wave separates from the film flow. The positions of separation obtained by the theoretical model agreed well with those of experiment for three kinds of liquids. Less

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 加藤健司,東恒雄: "水平円柱側壁に沿って流下する液膜流の挙動に関する研究(液膜表面に現れる定在波の波長)"日本機械学会論文集B編. 66巻643号. 774-781 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kenji Katoh,Kwing-So Choi and Tsuneo Azuma: "Heat-Transfer Enhancement and Pressure Loss by Surface Roughness in Turbulent Channel Flows"International Journal of Heat and Mass Transfer. Vol.43. 4009-4017 (2000)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 加藤健司,東恒雄: "三次元ランダムな性状をもつ固体面上でのぬれ挙動(接触角の履歴現象)"日本機械学会論文集B編. 67巻654号. 501-507 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 加藤健司,東恒雄: "接触角の履歴現象に及ぼす残留気泡・液滴の影響"日本機械学会論文集B編. (掲載予定). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kenji Katoh and Tsuneo Azuma: "Wetting on a Plate with Three-Dimensional Random Roughness and Heterogeneity (Equilibrium State and Contact Angle Observed Macroscopically)"Heat Transfer-Asian Research. (in print). (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kenji Katoh and Tsuneo Azuma: "Characteristics of Liquid Film Flowing around Side Wall of a Horizontal Circular Cylinder (Wave Length of Standing Wave Appearing on Film Surface)"Transactions of The Japan Society of Mechanical Engineers Series B. 66-643. 774-781 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Katoh, Kwing-So Choi and Tsuneo Azuma: "Heat-Transfer Enhancement and Pressure Loss by Surface Roughness in Turbulent Channel Flows"International Journal of Heat and Mass Transfer. 43. 4009-4017 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Katoh and Tsuneo Azuma: "Wetting on a Plate with Three-Dimensional Random Heterogeneity and Roughness (Relation between Equilibrium State and Contact Angle Observed Macroscopically)"Transactions of The Japan Society of Mechanical Engineers Series B. 67-654. 501-507 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Katoh and Tsuneo Azuma: "The Effect of Residual Bubble and Drop on the Hysteresis Phenomenon of Contact Angle"Transactions of The Japan Society of Mechanical Engineers Series B. (in print).

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kenji Katoh and Tsuneo Azuma: "Wetting on a Plate with Three-Dimensional Random Roughness and Heterogeneity (Equilibrium State and Contact Angle Observed Macroscopically)"Heat Transfer-Asian Research. (in print).

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2002-03-26  

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