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Title: Dry patch stability of shear driven liquid film

Abstract

The breakdown of the liquid film at the wall in annular gas-liquid flow may lead to the formation of a stable dry patch. For the case of heat transfer surfaces this causes a hot spot, The dry patch is a partial area on the solid surface that is non-wetted due to a local disturbance of the flow and is sustained by surface tension. Dry patch stability is dependent on a balance of body and surface forces. In the present study the interfacial shear force drives the film and the gravity force is negligible. A new computational fluid dynamics (CFD) solution of the flow field in the film around the dry patch has been obtained. The CFD results confirm Murgatroyd's shear force model (1965), although the details are more complex. Furthermore, there is agreement between the CFD solution and the experimental value of the characteristic length scale, L, for the shear force. In addition new experimental data have been taken for adiabatic upward annular air-water and air-ethylene glycol flows at room temperature in a 9.5 mm diameter tube. They provide validation of Murgatroyd's model over a wider range of the film's Reynolds number than previous data.

Authors:
; ; ;
Publication Date:
Research Org.:
Bettis Atomic Power Lab., West Mifflin, PA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
770675
Report Number(s):
B-T-3228
TRN: AH200131%%99
DOE Contract Number:  
AC11-98PN38206
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 1 May 2000
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; LIQUIDS; FILMS; GLYCOLS; HEAT TRANSFER; REYNOLDS NUMBER; SHEAR; STABILITY; SURFACE TENSION; GAS FLOW; LIQUID FLOW; FLUID MECHANICS; ANNULAR SPACE; AIR; WATER

Citation Formats

D.G. Penn, M.L. de Bertodano, P. Lykoudis, and S.G. Beus. Dry patch stability of shear driven liquid film. United States: N. p., 2000. Web. doi:10.2172/770675.
D.G. Penn, M.L. de Bertodano, P. Lykoudis, & S.G. Beus. Dry patch stability of shear driven liquid film. United States. doi:10.2172/770675.
D.G. Penn, M.L. de Bertodano, P. Lykoudis, and S.G. Beus. Mon . "Dry patch stability of shear driven liquid film". United States. doi:10.2172/770675. https://www.osti.gov/servlets/purl/770675.
@article{osti_770675,
title = {Dry patch stability of shear driven liquid film},
author = {D.G. Penn and M.L. de Bertodano and P. Lykoudis and S.G. Beus},
abstractNote = {The breakdown of the liquid film at the wall in annular gas-liquid flow may lead to the formation of a stable dry patch. For the case of heat transfer surfaces this causes a hot spot, The dry patch is a partial area on the solid surface that is non-wetted due to a local disturbance of the flow and is sustained by surface tension. Dry patch stability is dependent on a balance of body and surface forces. In the present study the interfacial shear force drives the film and the gravity force is negligible. A new computational fluid dynamics (CFD) solution of the flow field in the film around the dry patch has been obtained. The CFD results confirm Murgatroyd's shear force model (1965), although the details are more complex. Furthermore, there is agreement between the CFD solution and the experimental value of the characteristic length scale, L, for the shear force. In addition new experimental data have been taken for adiabatic upward annular air-water and air-ethylene glycol flows at room temperature in a 9.5 mm diameter tube. They provide validation of Murgatroyd's model over a wider range of the film's Reynolds number than previous data.},
doi = {10.2172/770675},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2000},
month = {5}
}