TY - GEN
T1 - Experimental study of air-water two-phase flow threshold velocities in a vertical annular channel
AU - Biton, A.
AU - Rabinovich, E.
AU - Gilad, E.
N1 - Publisher Copyright:
© 2023 Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. All rights reserved.
PY - 2023/1/1
Y1 - 2023/1/1
N2 - One of the key requirements for adequate two-phase flow (gas-liquid) systems design is an accurate prediction of the threshold velocities representing the boundary between two or more flow regimes. This work presents an experimental study of five threshold velocities conducted with air-water flow in a vertical channel. The following threshold velocities were measured: onset flooding (OF), end flooding (EF), onset deflooding (OD), end deflooding (ED), and minimum pressure (MP) velocities. The experimental system includes a transparent vertical annular channel. A counter-current or concurrent upward flow was achieved by blowing air upward from the channel's bottom and flow water from its top. The threshold velocities were found by visual observation or analysis of the pressure vs. air superficial velocity diagram. It was found that there is an evident hysteresis between the end flooding and onset deflooding velocities. On the contrary, the end deflooding and the onset flooding velocities are equal.
AB - One of the key requirements for adequate two-phase flow (gas-liquid) systems design is an accurate prediction of the threshold velocities representing the boundary between two or more flow regimes. This work presents an experimental study of five threshold velocities conducted with air-water flow in a vertical channel. The following threshold velocities were measured: onset flooding (OF), end flooding (EF), onset deflooding (OD), end deflooding (ED), and minimum pressure (MP) velocities. The experimental system includes a transparent vertical annular channel. A counter-current or concurrent upward flow was achieved by blowing air upward from the channel's bottom and flow water from its top. The threshold velocities were found by visual observation or analysis of the pressure vs. air superficial velocity diagram. It was found that there is an evident hysteresis between the end flooding and onset deflooding velocities. On the contrary, the end deflooding and the onset flooding velocities are equal.
KW - End deflooding velocity
KW - End flooding velocity
KW - Gas-liquid two-phase flow
KW - Minimum pressure velocity
KW - Onset deflooding velocity
KW - Onset flooding velocity
UR - http://www.scopus.com/inward/record.url?scp=85202939279&partnerID=8YFLogxK
U2 - 10.13182/NURETH20-40079
DO - 10.13182/NURETH20-40079
M3 - Conference contribution
AN - SCOPUS:85202939279
T3 - Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023
SP - 2475
EP - 2486
BT - Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023
PB - American Nuclear Society
T2 - 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023
Y2 - 20 August 2023 through 25 August 2023
ER -
