Experimental study of air-water two-phase flow threshold velocities in a vertical annular channel

A. Biton; E. Rabinovich; E. Gilad

doi:10.13182/NURETH20-40079

Experimental study of air-water two-phase flow threshold velocities in a vertical annular channel

A. Biton
, E. Rabinovich
, E. Gilad

Unit of Nuclear Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

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.

Original language	English
Title of host publication	Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023
Publisher	American Nuclear Society
Pages	2475-2486
Number of pages	12
ISBN (Electronic)	9780894487934
DOIs	https://doi.org/10.13182/NURETH20-40079
State	Published - 1 Jan 2023
Event	20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023 - Washington, United States Duration: 20 Aug 2023 → 25 Aug 2023

Publication series

Name	Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023

Conference

Conference	20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023
Country/Territory	United States
City	Washington
Period	20/08/23 → 25/08/23

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 11 Sustainable Cities and Communities

Keywords

End deflooding velocity
End flooding velocity
Gas-liquid two-phase flow
Minimum pressure velocity
Onset deflooding velocity
Onset flooding velocity

ASJC Scopus subject areas

Nuclear Energy and Engineering
Instrumentation

Access to Document

10.13182/NURETH20-40079

Cite this

Biton, A., Rabinovich, E., & Gilad, E. (2023). Experimental study of air-water two-phase flow threshold velocities in a vertical annular channel. In Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023 (pp. 2475-2486). (Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023). American Nuclear Society. https://doi.org/10.13182/NURETH20-40079

Biton, A. ; Rabinovich, E. ; Gilad, E. / Experimental study of air-water two-phase flow threshold velocities in a vertical annular channel. Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. American Nuclear Society, 2023. pp. 2475-2486 (Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023).

@inproceedings{cac8d24940d44ce8bb204914a1750f75,

title = "Experimental study of air-water two-phase flow threshold velocities in a vertical annular channel",

abstract = "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.",

keywords = "End deflooding velocity, End flooding velocity, Gas-liquid two-phase flow, Minimum pressure velocity, Onset deflooding velocity, Onset flooding velocity",

author = "A. Biton and E. Rabinovich and E. Gilad",

note = "Publisher Copyright: {\textcopyright} 2023 Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. All rights reserved.; 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023 ; Conference date: 20-08-2023 Through 25-08-2023",

year = "2023",

month = jan,

day = "1",

doi = "10.13182/NURETH20-40079",

language = "English",

series = "Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023",

publisher = "American Nuclear Society",

pages = "2475--2486",

booktitle = "Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023",

address = "United States",

}

Biton, A, Rabinovich, E & Gilad, E 2023, Experimental study of air-water two-phase flow threshold velocities in a vertical annular channel. in Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023, American Nuclear Society, pp. 2475-2486, 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023, Washington, United States, 20/08/23. https://doi.org/10.13182/NURETH20-40079

Experimental study of air-water two-phase flow threshold velocities in a vertical annular channel. / Biton, A.; Rabinovich, E.; Gilad, E.
Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. American Nuclear Society, 2023. p. 2475-2486 (Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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.

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 - https://www.scopus.com/pages/publications/85202939279

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 -

Biton A, Rabinovich E, Gilad E. Experimental study of air-water two-phase flow threshold velocities in a vertical annular channel. In Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023. American Nuclear Society. 2023. p. 2475-2486. (Proceedings of the 20th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2023). doi: 10.13182/NURETH20-40079

Experimental study of air-water two-phase flow threshold velocities in a vertical annular channel

Abstract

Publication series

Conference

UN SDGs

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this