Effect of steam condensation on countercurrent flow limiting in nearly horizontal two-phase flow

2000 ◽  
Vol 196 (2) ◽  
pp. 201-217 ◽  
Author(s):  
Moon-Hyun Chun ◽  
Seon-Oh Yu
Keyword(s):  
Two Phase Flow ◽  
Countercurrent Flow ◽  
Phase Flow ◽  
Steam Condensation ◽  
Two Phase

scholarly journals CFD modelling of wall steam condensation by a two-phase flow approach

2011 ◽  
Vol 241 (11) ◽  
pp. 4445-4455 ◽  
Author(s):  
S. Mimouni ◽  
A. Foissac ◽  
J. Lavieville
Keyword(s):  
Two Phase Flow ◽  
Phase Flow ◽  
Steam Condensation ◽  
Cfd Modelling ◽  
Two Phase

Experimental Investigation of Steam Condensation in a Silicon Microchannel

2010 ◽  
Author(s):  
A. Odaymet ◽  
H. Louahlia-Gualous
Keyword(s):  
Atmospheric Pressure ◽  
Two Phase Flow ◽  
Rectangular Cross Section ◽  
Flow Patterns ◽  
Experimental Investigations ◽  
Phase Flow ◽  
Steam Condensation ◽  
Two Phase ◽  
Mass Fluxes ◽  
Study Heat Transfer

Experimental investigations of a two-phase flow were conducted to study heat transfer and various flow patterns of steam condensation in two different microchannels. Microchannels have a rectangular cross-section with hydraulic diameter of 305μm (depth of 310μm and width of 300μm) and 410.5μm (depth of 312μm and width of 600μm). The length of each microchannel is of 50 mm. The silicon microchannel is covered with a transparent thin Pyrex plate to view different flow patterns. Microthermocouples (K-type, 20μm) were placed in rectangular silicon grooves. Measurements are carried out for different inlet pressures and flow rates of steam while the outlet pressure of the microchannel is kept at atmospheric pressure. Plug/slug flow patterns are observed in the microchannel for different mass fluxes. Local surface temperatures along the microchannel corresponding of each two-phase flow structure are measured and analyzed.

Mechanism and Effects of Predominant Parameters Regarding Limitation of Falling Water in Vertical Countercurrent Two-Phase Flow

1996 ◽  
Vol 118 (3) ◽  
pp. 715-724 ◽  
Author(s):  
Y. Sudo
Keyword(s):  
Water Mass ◽  
Two Phase Flow ◽  
Water Injection ◽  
Momentum Equation ◽  
Wall Friction ◽  
Countercurrent Flow ◽  
Phase Flow ◽  
Flow Limitation ◽  
Two Phase ◽  
Channel Configuration

In this study, an investigation was carried out to clarify the mechanism of countercurrent flow limitation (CCFL) or flooding, that is, limitations in the falling water mass flux in countercurrent two-phase flow in vertical channels, and to identify the effects of predominant parameters regarding CCFL, adopting the criterion that the CCFL condition be given by an envelope of momentum equation applied for the entire length of the channel with respect to any void fraction. As a result, it was found that the analytical model proposed could adequately predict all existing experimental results investigated in this study. In the channel configuration, circular, rectangular, and annular or planar channels, channel dimensions of diameter, gap size, width or circumference, and length, interfacial and wall friction, water injection mode, and inlet water subcooling were dominant parameters. Therefore, both the mechanism and the quantitative effects of CCFL have been identified.

Effect of Steam Condensation for Gas-Liquid Two-Phase Flow Behavior during Pool Scrubbing

2019 ◽  
Vol 2019.25 (0) ◽  
pp. 18B06
Author(s):  
Yuki NAKAMURA ◽  
Kota FUJIWARA ◽  
Wataru KIKUCHI ◽  
Tomohisa YUASA ◽  
Shimpei SAITO ◽  
...  
Keyword(s):  
Two Phase Flow ◽  
Flow Behavior ◽  
Phase Flow ◽  
Steam Condensation ◽  
Two Phase

Experimental study on two-phase flow pressure drop during steam condensation in trapezoidal microchannels

2016 ◽  
Vol 76 ◽  
pp. 45-56 ◽  
Author(s):  
Xiaoguang Fan ◽  
Xuehu Ma ◽  
Lei Yang ◽  
Zhong Lan ◽  
Tingting Hao ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pressure Drop ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Steam Condensation ◽  
Two Phase ◽  
Flow Pressure

The Characteristic of Two-Phase Flow Pattern on Air-Water Countercurrent Flow in Vertical Pipe

2018 ◽  
Vol 792 ◽  
pp. 190-194
Author(s):  
Sukamta ◽  
Reza Ali Firdaus ◽  
Thoharudin
Keyword(s):  
Flow Pattern ◽  
Flow Rate ◽  
Two Phase Flow ◽  
Pressure Sensors ◽  
Differential Pressure ◽  
Countercurrent Flow ◽  
Phase Flow ◽  
Vertical Pipe ◽  
Two Phase ◽  
Transparent Tube

Two-phase flow is widely encountered in several engineering and industrial facilities. The purpose of this study is to investigate the characteristic of slug countercurrent flow pattern in a vertical small diameter pipe. An experimental investigation in this study has been performed toward a transparent tube of 19 mm diameter (outside diameter 22 mm, length 200 mm), water and air as the liquid and gas fluid in the vertical pipe followed by taking a picture of flow pattern in the transparent pipe using the high-speed camera. Two differential pressure sensors were set in transparent tube in order to receive slug countercurrent flow rate associated with the acquisition data as media to record data and then displayed on the screen. The two-phase flow was always preceded by the instability of flow rate and bubbles appearance. It occurred after the steady flow data acquisition rate was turned on for recording the differential pressure. The result showed that the flow pattern characteristic of two-phase flow (air-water) in the vertical pipe caused by the superficial velocity of air.

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