### 抄録

In order to use vortex rings for mass and momentum transport, the relationship between the circulation of vortex rings generated continuously by a pulsating jet flow, which are referred to herein as 'cyclic vortex rings', and the conditions of jet flow are investigated experimentally. The results indicate that the formation time at which the cyclic vortex rings reach maximum circulation, i.e., become optimal vortex rings, can be estimated using the concept proposed by Gharib et al. Based on their concept, the optimal vortex rings are formed when the translation velocity of the vortex core becomes equal to the convection velocity of the shear layer of the jet. The translation velocity of vortex rings and the convection velocity of shear layers can be estimated by empirical equations under pulsating jet conditions. Therefore, the formation time of the optimal vortex rings can be estimated from the pulsating jet conditions, when the circulation of vortex rings stop growing and the vortex rings start to become disconnected from the shear layers. The circulation of vortex rings estimated using this method is in good agreement with the measurement data within the measurement error. There exists a specific Strouhal number at which the circulation of the vortex rings reaches the maximum value. This Strouhal number is expected to be the optimal generating condition of cyclic vortex rings for using transportation.

元の言語 | 英語 |
---|---|

ホスト出版物のタイトル | ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011 |

ページ | 2911-2920 |

ページ数 | 10 |

エディション | PARTS A, B, C, D |

DOI | |

出版物ステータス | 出版済み - 12 1 2011 |

イベント | ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011 - Hamamatsu, 日本 継続期間: 7 24 2011 → 7 29 2011 |

### 出版物シリーズ

名前 | ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011 |
---|---|

番号 | PARTS A, B, C, D |

巻 | 1 |

### その他

その他 | ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011 |
---|---|

国 | 日本 |

市 | Hamamatsu |

期間 | 7/24/11 → 7/29/11 |

### Fingerprint

### All Science Journal Classification (ASJC) codes

- Fluid Flow and Transfer Processes

### これを引用

*ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011*(PARTS A, B, C, D 版, pp. 2911-2920). (ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011; 巻数 1, 番号 PARTS A, B, C, D). https://doi.org/10.1115/AJK2011-16015

**Circulation of a vortex ring generated by pulsating jet flow.** / Akagi, Fujio; Kawabata, Keisuke; Ando, Youichi; Yamaguchi, Sumio; Furukawa, Masato.

研究成果: 著書/レポートタイプへの貢献 › 会議での発言

*ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011.*PARTS A, B, C, D Edn, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011, 番号 PARTS A, B, C, D, 巻. 1, pp. 2911-2920, ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011, Hamamatsu, 日本, 7/24/11. https://doi.org/10.1115/AJK2011-16015

}

TY - GEN

T1 - Circulation of a vortex ring generated by pulsating jet flow

AU - Akagi, Fujio

AU - Kawabata, Keisuke

AU - Ando, Youichi

AU - Yamaguchi, Sumio

AU - Furukawa, Masato

PY - 2011/12/1

Y1 - 2011/12/1

N2 - In order to use vortex rings for mass and momentum transport, the relationship between the circulation of vortex rings generated continuously by a pulsating jet flow, which are referred to herein as 'cyclic vortex rings', and the conditions of jet flow are investigated experimentally. The results indicate that the formation time at which the cyclic vortex rings reach maximum circulation, i.e., become optimal vortex rings, can be estimated using the concept proposed by Gharib et al. Based on their concept, the optimal vortex rings are formed when the translation velocity of the vortex core becomes equal to the convection velocity of the shear layer of the jet. The translation velocity of vortex rings and the convection velocity of shear layers can be estimated by empirical equations under pulsating jet conditions. Therefore, the formation time of the optimal vortex rings can be estimated from the pulsating jet conditions, when the circulation of vortex rings stop growing and the vortex rings start to become disconnected from the shear layers. The circulation of vortex rings estimated using this method is in good agreement with the measurement data within the measurement error. There exists a specific Strouhal number at which the circulation of the vortex rings reaches the maximum value. This Strouhal number is expected to be the optimal generating condition of cyclic vortex rings for using transportation.

AB - In order to use vortex rings for mass and momentum transport, the relationship between the circulation of vortex rings generated continuously by a pulsating jet flow, which are referred to herein as 'cyclic vortex rings', and the conditions of jet flow are investigated experimentally. The results indicate that the formation time at which the cyclic vortex rings reach maximum circulation, i.e., become optimal vortex rings, can be estimated using the concept proposed by Gharib et al. Based on their concept, the optimal vortex rings are formed when the translation velocity of the vortex core becomes equal to the convection velocity of the shear layer of the jet. The translation velocity of vortex rings and the convection velocity of shear layers can be estimated by empirical equations under pulsating jet conditions. Therefore, the formation time of the optimal vortex rings can be estimated from the pulsating jet conditions, when the circulation of vortex rings stop growing and the vortex rings start to become disconnected from the shear layers. The circulation of vortex rings estimated using this method is in good agreement with the measurement data within the measurement error. There exists a specific Strouhal number at which the circulation of the vortex rings reaches the maximum value. This Strouhal number is expected to be the optimal generating condition of cyclic vortex rings for using transportation.

UR - http://www.scopus.com/inward/record.url?scp=84881467587&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84881467587&partnerID=8YFLogxK

U2 - 10.1115/AJK2011-16015

DO - 10.1115/AJK2011-16015

M3 - Conference contribution

SN - 9780791844403

T3 - ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011

SP - 2911

EP - 2920

BT - ASME-JSME-KSME 2011 Joint Fluids Engineering Conference, AJK 2011

ER -