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Development of an unsheared mixing technology by means of buoyant convection and ultrasound

Research Project

Project/Area Number 11555059
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Thermal engineering
Research InstitutionKYOTO UNIVERSITY

Principal Investigator

KOMORI Satoru  Kyoto Univ., Mech. Eng., Professor, 工学研究科, 教授 (60127082)

Co-Investigator(Kenkyū-buntansha) KANZAKI Takao  Central Research Institute of Electric Power Industry, Senior Research Engineer, 大気科学部, 主任研究員
KUROSE Ryoichi  Central Research Institute of Electric Power Industry, Senior Research Engineer, エネルギー化学部, 主任研究員
NAGATA Koji  Kyoto Univ., Mech. Eng., Lecturer, 工学研究科, 講師 (50274501)
Project Period (FY) 1999 – 2001
Project Status Completed (Fiscal Year 2001)
Budget Amount *help
¥13,700,000 (Direct Cost: ¥13,700,000)
Fiscal Year 2001: ¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 2000: ¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 1999: ¥7,200,000 (Direct Cost: ¥7,200,000)
KeywordsThermal Stratification / Buoyant convection / Turbulent Mixing / Chemical Reaction
Research Abstract

The unsheared mixing technology is required to avoid the destruction of the biocell or polymer molecules in bio- and polymerization reactors. The purpose of.this study is, therefore, to develop an unsheared mixing technology by means of body forces such as buoyant convection. The effects of unstable thermal-stratification on the chemical reaction and turbulent mixing were experimentally investigated both in reacting grid-generated turbulence and in turbulent reacting mixing-layer. Experiments were carried out in unsheared neutrally-stratified, unsheared unstably stratified and sheared neutrally-stratified conditions. Instantaneous velocity and concentration were simultaneously measured using both a laser Doppler velocimeter and a laser-induced fluorescence technique. The Large-eddy simulation (LES) based on the large-eddy probability-density function model was applied to the same thermally stratified flows.
The results show that the turbulent mixing is enhanced at both large and small scales by buoyancy under unstably stratified conditions and therefore the chemical reaction is strongly promoted. The mean shear acts to enhance the turbulent mixing mainly at large scales. However, the chemical reaction rate in the sheared flow is not so large compared to the unstably stratified case with the same turbulence level, since the mixing at small scales in the sheared neutrally stratified flow is weaker than that in the unsheared unstably-stratified flow. The unstable stratification is regarded as a better tool to attain the unsheared mixing since the shearing stress acting on the fluid is much weaker in the unstably stratified flow than in the sheared flow. The effects of the stratification on the turbulent mixing and chemical reaction were well estimated by the LES.

Report

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

    (18 results)

All Other

All Publications (18 results)

  • [Publications] Y.Wang, S.Komori: "Application of a Second-Moment closure Model to Simulate the Turbulent Dispersion from an Elevated Line Source"Heat and Mass Transfer. Vol.34(5). 429-436 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] 長田孝二, 小森 悟: "不安定温度成層乱流場での混合反応機構"数理解析研究所講究録115熱対流の数理・流れ場の構造. 37-43 (1999)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Wang, S.Komori: "On the Improvement of the SIMPLE-Like Method for Flows with complex Geometry"Heat and Mass Transfer. Vol.36(1). 71-78 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K.Nagata, S.Komori: "The Effects of Unstable Stratification and Mean Shear on the Chemical Reaction in Grid Turbulence"Journal of Fluid Mechanics. 408. 39-52 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Wang, K.Nagata, S.Komori: "Strongly Stably Stratified Grid Turbulence Using Second-Moment Closure"AIAA Journal. Vol.38(8). 1419-0102 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R.Kurose, H.Makino, T.Michioka, S.Komori: "Large Eddy Simulation of a Non-Premixed Turbulent Reacting Mixing Layer : Effects of Heat Release and Spanwise Fluid Shear"Combustion and Flame. 127. 2157-2163 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Wang and S. Komoriy: "Application of a Second-Moment Closure Model to Simulate the Turbulent Dispersion from an Elevated Line Source"Heat and Mass Transfer. 34(5). 429-436 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Wang and S. Komori: "On the Improvement of the SIMPLE-Like Method for Flows with Complex Geometry"Heat and Mass Transfer. 36(1). 71-78 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] K. Nagata and S. Komori: "The Effects of Unstable Stratification and Mean Shear on the Chemical Reaction in Grid Turbulence"Journal of Fluid Mechanic. 48. 39-52 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y. Wang, K. Nagata and S. Komori: "Strongly Stably Stratified Grid Turbulence Using Second-Moment Closure"AIAA Journal. 38(8). 1419-1425 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] R. Kurose, H. Makind, T. Michioka and S. Komori: "Large Eddy Simulation of a Non-Premixed Turbulent Reacting Mixing Layer : Effects of Heat Release and Spanwise Fluid Shear"Combustion and Flame. 127. 2157-2163 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2001 Final Research Report Summary
  • [Publications] Y.Wang, S.Komori: "On the Improvement of the Simple-Like Method for Flows with Complex Geometry"Heat and Mass Transfer. 36. 71-78 (2000)

    • Related Report
      2001 Annual Research Report
  • [Publications] R.Kurose, H.Makino, T.Michioka, S.Komori: "Large Eddy Simulation of a Non-Premixed Turbulent Reacting Mixing Layer : Effects of Heat Release and Spanwise Fluid Shear"Combustion and Flame. 127. 2157-2163 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] 小森 悟, 長田孝二: "密度成層流中での乱流輸送現象に関する実験的研究"ながれ. 20巻1号. 18-25 (2001)

    • Related Report
      2001 Annual Research Report
  • [Publications] Y.Wang and S.Komori: "Computation of turbulent flow in a stirred tank using second-moment closure"Proc.of the 3rd International Symposium on Turbulence, Heat and Mass Transfer. 497-504 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 長田孝二,小森 悟: "DNS による強い安定成層下での アクティブスカラ と パッシブスカラ の乱流拡散の違いの評価"日本機械学会論文集(B編). 65巻638号. 3439-3446 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] K.Nagata and S.Komori: "The Effects of Unstable-Stratification and Shear on a Rapid Reaction in Grid Turbulence"Journal of Fluid Mechanics. 408. 39-52 (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] Y.Wang,K.Nagata and S.Komori: "A Second-Moment Closure Model for Strongly Stably-Stratified Grid Turbulence"AIAA Journal. (受理). (2000)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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