JP7072269B2 - ボイド率計測装置およびボイド率計測方法 - Google Patents
ボイド率計測装置およびボイド率計測方法 Download PDFInfo
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- JP7072269B2 JP7072269B2 JP2020060039A JP2020060039A JP7072269B2 JP 7072269 B2 JP7072269 B2 JP 7072269B2 JP 2020060039 A JP2020060039 A JP 2020060039A JP 2020060039 A JP2020060039 A JP 2020060039A JP 7072269 B2 JP7072269 B2 JP 7072269B2
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図1において、本発明の実施の形態におけるボイド率計測装置1は、液体F1中に気体F2を微細気泡として含む流体(気液混相流)F中に圧力波としての音波Pを照射する照射部10と、照射部10と所定の距離Lを隔てて配置され、照射部10から照射された音波Pを検知する検知部11と、音波Pの伝播速度cからボイド率αを算出する演算部12とを有する。ボイド率αは、流体(気液混相流)F中に占める気体F2の体積の割合(比率)である。
液体F1中に気体F2を微細気泡として含む流体F全体の体積弾性率をE[Pa]、流体F全体の密度をρ[kg/m3]とすると、音速cは次式(1)で表される。
図5に示す実験装置では、水槽2内の液体F1としての水を吸入口3Aからマイクロバブル発生装置4に取り込み、この取り込んだ水中にマイクロバブル発生装置4により気体F2としての空気を微細気泡としてのマイクロバブルとして含む流体Fとして排出口3Bから水槽2内へ戻している。この水槽2の流体F内に照射部10と検知部11とを距離L隔てて配置した。
2 水槽
3A 吸入口
3B 排出口
4 マイクロバブル発生装置
10 照射部
11 検知部
12 演算部
13 信号発生器
14 信号測定器
Claims (4)
- 前記圧力波は音波である請求項1記載のボイド率計測装置。
- ボイド率1%以下の流体を計測対象とする請求項1または2に記載のボイド率計測装置。
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2000241295A (ja) | 1999-02-17 | 2000-09-08 | Sumitomo Metal Ind Ltd | 可動機構検査用装置及び可動機構検査方法 |
JP2010216872A (ja) | 2009-03-13 | 2010-09-30 | Yokogawa Electric Corp | 超音波測定器 |
US20160041286A1 (en) | 2013-04-04 | 2016-02-11 | Dipen N. Sinha | Methods for measuring properties of multiphase oil-water-gas mixtures |
JP2016040544A (ja) | 2014-08-13 | 2016-03-24 | 横河電機株式会社 | 多相流流量計 |
US20170000940A1 (en) | 2013-11-28 | 2017-01-05 | GAMPT mgH Gesellschaft fur Angewandte Medizinische Physik und Technik | Method for establishing and/or monitoring the state of an extracorporeal fluid or fluid flow by means of ultrasound |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5819557A (ja) * | 1981-07-28 | 1983-02-04 | Hitachi Ltd | ナトリウムボイド計 |
FR2522153A1 (fr) * | 1982-02-19 | 1983-08-26 | Framatome Sa | Procede de mesure par ultrasons du rapport du volume de gaz present dans une enceinte contenant un melange liquide-gaz au volume total de l'enceinte |
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- 2020-03-30 JP JP2020060039A patent/JP7072269B2/ja active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000241295A (ja) | 1999-02-17 | 2000-09-08 | Sumitomo Metal Ind Ltd | 可動機構検査用装置及び可動機構検査方法 |
JP2010216872A (ja) | 2009-03-13 | 2010-09-30 | Yokogawa Electric Corp | 超音波測定器 |
US20160041286A1 (en) | 2013-04-04 | 2016-02-11 | Dipen N. Sinha | Methods for measuring properties of multiphase oil-water-gas mixtures |
US20170000940A1 (en) | 2013-11-28 | 2017-01-05 | GAMPT mgH Gesellschaft fur Angewandte Medizinische Physik und Technik | Method for establishing and/or monitoring the state of an extracorporeal fluid or fluid flow by means of ultrasound |
JP2016040544A (ja) | 2014-08-13 | 2016-03-24 | 横河電機株式会社 | 多相流流量計 |
Non-Patent Citations (1)
Title |
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冨島康夫,気泡を含む水中における音波伝播時間分布に関する研究 音波による水中気泡量測定に関する基礎的研究 (第1報),資源と素材,1995年,Vol.111 No.9,pp.623-629 |
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