TY - GEN
T1 - Axial flow characteristics of bubbly flow in a vertical large-diameter square duct
AU - Shen, Xiuzhong
AU - Sun, Haomin
AU - Deng, Baoqing
AU - Hibiki, Takashi
AU - Nakamura, Hideo
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2017
Y1 - 2017
N2 - In this paper, an extensive experimental study on the atmospheric upward bubbly air-water flows in a vertical large-diameter square duct flow channel (cross-section, 100mm×100mm, hydraulic equivalent diameter, DH=0.1m and height, 3 m) have been performed by using four-sensor probes. The four-sensor probe with the latest four-sensor probe signal processing method were applied in the local measurements at 3 axial positions (z/DH =9.2, 19.2, 29.2) to obtain interfacial area concentration (IAC), 3-D bubble velocity vector and bubble diameter for the complex flow structure. The measurements were carried out locally at 66 points within an octant symmetric triangular zone in the cross-section at each axial position. The agreement between these local measurement results of the four-sensor probes and the measured results from the differential pressure gauges and the air flow meters is reasonably good. The obtained void fraction, interfacial area concentration, 3-D bubble velocity vector and bubble diameter provided valuable insight into the flow structure and behavior in the corresponding flow regimes and will serve as a valuable database relating to the cross-sectional local profiles and axial development that can be used to develop the interfacial area transport equations and further to assist in the development of the mechanistic models for interfacial area transport equation sources and sinks.
AB - In this paper, an extensive experimental study on the atmospheric upward bubbly air-water flows in a vertical large-diameter square duct flow channel (cross-section, 100mm×100mm, hydraulic equivalent diameter, DH=0.1m and height, 3 m) have been performed by using four-sensor probes. The four-sensor probe with the latest four-sensor probe signal processing method were applied in the local measurements at 3 axial positions (z/DH =9.2, 19.2, 29.2) to obtain interfacial area concentration (IAC), 3-D bubble velocity vector and bubble diameter for the complex flow structure. The measurements were carried out locally at 66 points within an octant symmetric triangular zone in the cross-section at each axial position. The agreement between these local measurement results of the four-sensor probes and the measured results from the differential pressure gauges and the air flow meters is reasonably good. The obtained void fraction, interfacial area concentration, 3-D bubble velocity vector and bubble diameter provided valuable insight into the flow structure and behavior in the corresponding flow regimes and will serve as a valuable database relating to the cross-sectional local profiles and axial development that can be used to develop the interfacial area transport equations and further to assist in the development of the mechanistic models for interfacial area transport equation sources and sinks.
KW - Flow development
KW - Four-sensor probe measurement
KW - Large-diameter square duct
KW - Local flow parameters
KW - Two-phase flow
UR - https://www.scopus.com/pages/publications/85052479689
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85052479689&origin=recordpage
M3 - RGC 32 - Refereed conference paper (with host publication)
VL - 2017-September
T3 - 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2017
BT - 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2017
PB - Association for Computing Machinery
T2 - 17th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2017
Y2 - 3 September 2017 through 8 September 2017
ER -