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Plume convection and freckle formation in a mushy layer daring solidification for multi-component system

Research Project

Project/Area Number 11650224
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Thermal engineering
Research InstitutionYamaguchi University

Principal Investigator

NISHIMURA Tatsuo  Faculty of Engineering, Yamaguchi University, Professor, 工学部, 教授 (90136135)

Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥3,400,000 (Direct Cost: ¥3,400,000)
Fiscal Year 2001: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2000: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1999: ¥1,800,000 (Direct Cost: ¥1,800,000)
KeywordsUnidirectional Solidification / Segregation / Crystal Growth / Finger Convection / Plume Convection
Research Abstract

In the unidirectional solidification cooled from below for multi-component system, several channels are formed in localized regions of the mushy layer, known as freckles. The origin of freckles is related to the onset of plume convection in the mushy layer. The present article describes the structure of plumes generated during solidification of a binary system. A transparent aqueous ammonium chrolide solution is employed for super-eutectic growth in a Hele-Shaw cell. The velocities of plume convection in the melt layer and interstitial fluid flow within the mushy layer are measured by the particle tracking and dye tracing methods, respectively. Several important features are identified for each convective flow. In particular, the plume convection is found to consist of the upward flow enveloped in the downward flow, i.e, double flow structure. The downward flow enhances the solidification in the neighborhood of the exit of the channel emanating the plume, like a volcano. Interstitial fluid within the mushy layer is observed to move downward uniformly, which is induced by the plume convection. As the initial temperature of the aqueous solution increases the strength of plume convection becomes weak due to the stabilizing effect of the vertical temperature gradient.

Report

(4 results)
  • 2001 Annual Research Report   Final Research Report Summary
  • 2000 Annual Research Report
  • 1999 Annual Research Report

Research Products

(25 results)

All Other

All Publications (25 results)

  • [Publications] T.Nishimura: "Traneport Processes During Solidification of Binary System"Recent.Res.Devel.Chem.Eng.. 3. 237-257 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Nishimura: "Natural Convection Suppression and Crystal Growth Daring Unidirectional Solidfication of a Binary System"Heat Transfer-Asian Res.. 29. 120-131 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 西村 龍夫: "熱と物質の同時移動における自然対流"ながれ. 19. 306-314 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Nishimura: "Interfacial Breakdown of Double-Diffusive Convective Layers by a Horizontal Temperature Gradient"Int.J.Heat Mass Transfer. 42. 1479-1489 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Nishimura: "Direct Numerical Simulation of Layer Merging in a Salt-Stratified System"Numerical Heat Transfer Part A. 37. 323-341 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Nishimura: "Traveling Plumes Generated within a Double-Diffusive Interface between Counter Shear Flows"Physics of Fluids A. 12. 3078-3081 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Nishimura: "Transport Processes During Solidification of Binary System"Recent. Res. Devel. Chem. Eng. Vol.3. 237-257 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Nishimura: "Natural Convection Suppression and Crystal Growth During Unidirectional Solidification of a Binary System"Heat Transfer-Asian Res. Vol.29. 120-131 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Nishimura: "Natural Convection by Combined Heat and Mass Transfer"Nagare. Vol.19. 306-314 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Nishimura: "Interfacial Breakdown of Double-Diffusive Convective Layers by a Horizontal Temperature Gradients"Int. J. Heat Mass Transfer. Vol.42. 1479-1489 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Nishimura: "Direct Numerical Simulation of Layer Herging in a Salt-Stratified System"Numerical Heat Transfer, Part A. Vol.37. 323-341 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T. Nishimura: "Traveling Plunes Generated within a Double-Diffusive Interface between Counter Shear Flows"Physics of Fluids A. Vol.12. 3078-3087 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] T.Nishimura: "Influence of Lewis Number on Double-Diffusive convection in a Square Cavity Filled with a Binary Gas"Heat Transfer-Asian Res.,. 30. 63-75 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 西村 龍夫: "LIFによる拡散界面近傍に形成される3次元プルームの可視化とその特性"可視化情報学会論文集. 21・6. 94-100 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Nishimura: "Characteristics of traveling plumes Generated within a Double-Diffusive between Counter Shear Flows"IHTC 12(国際伝執会議). (2002)

    • Related Report
      2001 Annual Research Report
  • [Publications] T.Nishimura: "Natural convection suppression and crystal growth during unidirectional solidification of a binary system"Heat Transfer Asian Research. 29・2. 120-131 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Nishimura: "Oscillatory natural convection by combined heat and mass transfer"Trends in Heat, Mass & Momentum Transfer. 6. 51-62 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 西村龍夫: "熱と物質の同時移動における自然対流"ながれ. 19. 306-314 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Nishimura: "Mass transfer through the diffusive interface in a two-layer, salt-stratified system under a horizontal temperature gradient"Chemical Engineering Science. 55. 5301-5309 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Nishimura: "Direct numerical simulation of layer merging in a salt-stratified system"Numerical Heat Transfer, Part A. 37. 327-341 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Nishimura: "Traveling plumes generated within a double-diffusive interface between counter shear flows"Physics of Fluids. 12・11. 3078-3081 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] T.Nishimura: "Velocity measurements of double-diffusive convection during unidirectional binary solidification"Proceedings of PSFVIP-2. PFO43. 1-6 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Nishimura: "Transport processes during of binary systems"Recent Res.Devel.Chem.Eng.. 3. 237-257 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Nishimura: "The structure of plumes generated in unidirectional solidification processes"Journal of Visualization. 2・2. 6 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] T.Nishimura: "Interfacial breakdown of double-diffusive convective layers by a horizontal temperature gradient"Int.J.Heat.Mass Transfer. 42. 1479-1489 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-03-31   Modified: 2016-04-21  

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