Experimental results of the effect of gas composition on void fraction and bubble behavior for gas-liquid two-phase flow under stagnant water condition
Fission product removal by pool scrubbing is known to be largely affected by the gas-liquid two-phase flow regime. The pool scrubbing performance of various carrier gases was evaluated in two-phase flow experiments by injecting helium, nitrogen, or argon through a pool of stagnant water in a column...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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The Japan Society of Mechanical Engineers
2021-03-01
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| Series: | Mechanical Engineering Journal |
| Subjects: | |
| Online Access: | https://www.jstage.jst.go.jp/article/mej/8/4/8_20-00546/_pdf/-char/en |
| _version_ | 1818750638479114240 |
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| author | Miki SAITO Taizo KANAI Satoshi NISHIMURA Yoshihisa NISHI |
| author_facet | Miki SAITO Taizo KANAI Satoshi NISHIMURA Yoshihisa NISHI |
| author_sort | Miki SAITO |
| collection | DOAJ |
| description | Fission product removal by pool scrubbing is known to be largely affected by the gas-liquid two-phase flow regime. The pool scrubbing performance of various carrier gases was evaluated in two-phase flow experiments by injecting helium, nitrogen, or argon through a pool of stagnant water in a column with an inner diameter of 0.5 m and a height of 8 m. The gases were supplied through a cylindrical nozzle with an inner diameter 69 mm at superficial gas velocities ranging from 0.013 to 0.053 m s-1. Measurements were conducted using a camera and two sets of a 128 × 128 wire-mesh sensors, separated by 40 mm. The visually observed gas hold-up and wire-mesh sensor-measured average void fraction decreased with increasing fraction of lighter gas in the supplied gas. Detailed analysis of the flow regime using the obtained wire-mesh sensor signals revealed that lighter gases led to a greater fraction of relatively large bubbles in the flow compared to heavier gases, causing the gas phase with the lighter gases to have a higher average rise velocity in the flow. This leads to a hypothesis that, compared to heavier gases, lighter gases break up less or coalesce more in the flow, resulting in distinct two-phase flow characteristics depending on the inlet gas composition. |
| first_indexed | 2024-12-18T04:22:51Z |
| format | Article |
| id | doaj.art-acff4278d9764478ae6097239aea3620 |
| institution | Directory Open Access Journal |
| issn | 2187-9745 |
| language | English |
| last_indexed | 2024-12-18T04:22:51Z |
| publishDate | 2021-03-01 |
| publisher | The Japan Society of Mechanical Engineers |
| record_format | Article |
| series | Mechanical Engineering Journal |
| spelling | doaj.art-acff4278d9764478ae6097239aea36202022-12-21T21:21:11ZengThe Japan Society of Mechanical EngineersMechanical Engineering Journal2187-97452021-03-018420-0054620-0054610.1299/mej.20-00546mejExperimental results of the effect of gas composition on void fraction and bubble behavior for gas-liquid two-phase flow under stagnant water conditionMiki SAITO0Taizo KANAI1Satoshi NISHIMURA2Yoshihisa NISHI3Central Research Institute of Electric Power IndustryCentral Research Institute of Electric Power IndustryCentral Research Institute of Electric Power IndustryCentral Research Institute of Electric Power IndustryFission product removal by pool scrubbing is known to be largely affected by the gas-liquid two-phase flow regime. The pool scrubbing performance of various carrier gases was evaluated in two-phase flow experiments by injecting helium, nitrogen, or argon through a pool of stagnant water in a column with an inner diameter of 0.5 m and a height of 8 m. The gases were supplied through a cylindrical nozzle with an inner diameter 69 mm at superficial gas velocities ranging from 0.013 to 0.053 m s-1. Measurements were conducted using a camera and two sets of a 128 × 128 wire-mesh sensors, separated by 40 mm. The visually observed gas hold-up and wire-mesh sensor-measured average void fraction decreased with increasing fraction of lighter gas in the supplied gas. Detailed analysis of the flow regime using the obtained wire-mesh sensor signals revealed that lighter gases led to a greater fraction of relatively large bubbles in the flow compared to heavier gases, causing the gas phase with the lighter gases to have a higher average rise velocity in the flow. This leads to a hypothesis that, compared to heavier gases, lighter gases break up less or coalesce more in the flow, resulting in distinct two-phase flow characteristics depending on the inlet gas composition.https://www.jstage.jst.go.jp/article/mej/8/4/8_20-00546/_pdf/-char/enpool scrubbinggas-liquid two-phase flowvoid fractionwire-mesh sensorbubble |
| spellingShingle | Miki SAITO Taizo KANAI Satoshi NISHIMURA Yoshihisa NISHI Experimental results of the effect of gas composition on void fraction and bubble behavior for gas-liquid two-phase flow under stagnant water condition Mechanical Engineering Journal pool scrubbing gas-liquid two-phase flow void fraction wire-mesh sensor bubble |
| title | Experimental results of the effect of gas composition on void fraction and bubble behavior for gas-liquid two-phase flow under stagnant water condition |
| title_full | Experimental results of the effect of gas composition on void fraction and bubble behavior for gas-liquid two-phase flow under stagnant water condition |
| title_fullStr | Experimental results of the effect of gas composition on void fraction and bubble behavior for gas-liquid two-phase flow under stagnant water condition |
| title_full_unstemmed | Experimental results of the effect of gas composition on void fraction and bubble behavior for gas-liquid two-phase flow under stagnant water condition |
| title_short | Experimental results of the effect of gas composition on void fraction and bubble behavior for gas-liquid two-phase flow under stagnant water condition |
| title_sort | experimental results of the effect of gas composition on void fraction and bubble behavior for gas liquid two phase flow under stagnant water condition |
| topic | pool scrubbing gas-liquid two-phase flow void fraction wire-mesh sensor bubble |
| url | https://www.jstage.jst.go.jp/article/mej/8/4/8_20-00546/_pdf/-char/en |
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