Local Void Fractions and Bubble Velocity in Vertical Air-Water Two-Phase Flows Measured by Needle-Contact Capacitance Probe
Multiphase flow measurements have become increasingly important in a wide range of industrial fields. In the present study, a dual needle-contact capacitance probe was newly designed to measure local void fractions and bubble velocity in a vertical channel, which was verified by digital high-speed c...
Saved in:
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wiley
2018-01-01
|
| Series: | Science and Technology of Nuclear Installations |
| Online Access: | http://dx.doi.org/10.1155/2018/7532618 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1832552183629873152 |
|---|---|
| author | Shanfang Huang Xiangxiang Wu Benyang Zong Yugao Ma Xiaoyu Guo Dong Wang |
| author_facet | Shanfang Huang Xiangxiang Wu Benyang Zong Yugao Ma Xiaoyu Guo Dong Wang |
| author_sort | Shanfang Huang |
| collection | DOAJ |
| description | Multiphase flow measurements have become increasingly important in a wide range of industrial fields. In the present study, a dual needle-contact capacitance probe was newly designed to measure local void fractions and bubble velocity in a vertical channel, which was verified by digital high-speed camera system. The theoretical analyses and experiments show that the needle-contact capacitance probe can reliably measure void fractions with the readings almost independent of temperature and salinity for the experimental conditions. In addition, the trigger-level method was chosen as the signal processing method for the void fraction measurement, with a minimum relative error of −4.59%. The bubble velocity was accurately measured within a relative error of 10%. Meanwhile, dynamic response of the dual needle-contact capacitance probe was analyzed in detail. The probe was then used to obtain raw signals for vertical pipe flow regimes, including plug flow, slug flow, churn flow, and bubbly flow. Further experiments indicate that the time series of the output signals vary as the different flow regimes and are consistent with each flow structure. |
| format | Article |
| id | doaj-art-c5fe186479d344d3b35ffe0225085c6b |
| institution | Kabale University |
| issn | 1687-6075 1687-6083 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Science and Technology of Nuclear Installations |
| spelling | doaj-art-c5fe186479d344d3b35ffe0225085c6b2025-02-03T05:59:24ZengWileyScience and Technology of Nuclear Installations1687-60751687-60832018-01-01201810.1155/2018/75326187532618Local Void Fractions and Bubble Velocity in Vertical Air-Water Two-Phase Flows Measured by Needle-Contact Capacitance ProbeShanfang Huang0Xiangxiang Wu1Benyang Zong2Yugao Ma3Xiaoyu Guo4Dong Wang5Department of Engineering Physics, Tsinghua University, Beijing 100084, ChinaDepartment of Engineering Physics, Tsinghua University, Beijing 100084, ChinaDepartment of Engineering Physics, Tsinghua University, Beijing 100084, ChinaDepartment of Engineering Physics, Tsinghua University, Beijing 100084, ChinaDepartment of Engineering Physics, Tsinghua University, Beijing 100084, ChinaState Key Laboratory of Multiphase Flow in Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaMultiphase flow measurements have become increasingly important in a wide range of industrial fields. In the present study, a dual needle-contact capacitance probe was newly designed to measure local void fractions and bubble velocity in a vertical channel, which was verified by digital high-speed camera system. The theoretical analyses and experiments show that the needle-contact capacitance probe can reliably measure void fractions with the readings almost independent of temperature and salinity for the experimental conditions. In addition, the trigger-level method was chosen as the signal processing method for the void fraction measurement, with a minimum relative error of −4.59%. The bubble velocity was accurately measured within a relative error of 10%. Meanwhile, dynamic response of the dual needle-contact capacitance probe was analyzed in detail. The probe was then used to obtain raw signals for vertical pipe flow regimes, including plug flow, slug flow, churn flow, and bubbly flow. Further experiments indicate that the time series of the output signals vary as the different flow regimes and are consistent with each flow structure.http://dx.doi.org/10.1155/2018/7532618 |
| spellingShingle | Shanfang Huang Xiangxiang Wu Benyang Zong Yugao Ma Xiaoyu Guo Dong Wang Local Void Fractions and Bubble Velocity in Vertical Air-Water Two-Phase Flows Measured by Needle-Contact Capacitance Probe Science and Technology of Nuclear Installations |
| title | Local Void Fractions and Bubble Velocity in Vertical Air-Water Two-Phase Flows Measured by Needle-Contact Capacitance Probe |
| title_full | Local Void Fractions and Bubble Velocity in Vertical Air-Water Two-Phase Flows Measured by Needle-Contact Capacitance Probe |
| title_fullStr | Local Void Fractions and Bubble Velocity in Vertical Air-Water Two-Phase Flows Measured by Needle-Contact Capacitance Probe |
| title_full_unstemmed | Local Void Fractions and Bubble Velocity in Vertical Air-Water Two-Phase Flows Measured by Needle-Contact Capacitance Probe |
| title_short | Local Void Fractions and Bubble Velocity in Vertical Air-Water Two-Phase Flows Measured by Needle-Contact Capacitance Probe |
| title_sort | local void fractions and bubble velocity in vertical air water two phase flows measured by needle contact capacitance probe |
| url | http://dx.doi.org/10.1155/2018/7532618 |
| work_keys_str_mv | AT shanfanghuang localvoidfractionsandbubblevelocityinverticalairwatertwophaseflowsmeasuredbyneedlecontactcapacitanceprobe AT xiangxiangwu localvoidfractionsandbubblevelocityinverticalairwatertwophaseflowsmeasuredbyneedlecontactcapacitanceprobe AT benyangzong localvoidfractionsandbubblevelocityinverticalairwatertwophaseflowsmeasuredbyneedlecontactcapacitanceprobe AT yugaoma localvoidfractionsandbubblevelocityinverticalairwatertwophaseflowsmeasuredbyneedlecontactcapacitanceprobe AT xiaoyuguo localvoidfractionsandbubblevelocityinverticalairwatertwophaseflowsmeasuredbyneedlecontactcapacitanceprobe AT dongwang localvoidfractionsandbubblevelocityinverticalairwatertwophaseflowsmeasuredbyneedlecontactcapacitanceprobe |