scholarly journals Dynamics of long gas bubbles rising in a vertical tube in a cocurrent liquid flow

2019 ◽  
Vol 4 (2) ◽  
Author(s):  
M. Magnini ◽  
S. Khodaparast ◽  
O. K. Matar ◽  
H. A. Stone ◽  
J. R. Thome
Keyword(s):  
Liquid Flow ◽  
Gas Bubbles ◽  
Vertical Tube

Surface Tension Effects on Liquid Flow in Small Plastic Tubes When Gas Bubbles are Present

2005 ◽  
Vol 219 (8) ◽  
pp. 853-857 ◽  
Author(s):  
M. R. Myers ◽  
H. M. Cave ◽  
S. P. Krumdieck
Keyword(s):  
Surface Tension ◽  
High Pressure ◽  
Pressure Drop ◽  
Liquid Flow ◽  
Slug Flow ◽  
Small Diameter ◽  
Gas Bubbles ◽  
Flow Regimes ◽  
Liquid Slug ◽  
Two Phase

Two-phase intermittent gas and liquid slug flow in small diameter glass and plastic tubes was studied. Two distinct flow regimes and the transition phenomena were identified. A modified Hagen-Poiseuille relation was derived to describe the extremely high pressure drop due to the surface tension effects of pinned slug flow.

Model of fractionation and coalescence of gas bubbles in a turbulent liquid flow

1997 ◽  
Vol 70 (6) ◽  
pp. 918-926 ◽  
Author(s):  
V. A. Sosinovich ◽  
V. A. Tsyganov ◽  
B. I. Puris ◽  
V. A. Gertsovich
Keyword(s):  
Liquid Flow ◽  
Gas Bubbles

A New Instrument in Cavitation Research: The Cavitation Susceptibility Meter

1982 ◽  
Vol 104 (2) ◽  
pp. 136-141 ◽  
Author(s):  
D. M. Oldenziel
Keyword(s):  
Tensile Strength ◽  
Vapor Pressure ◽  
Liquid Flow ◽  
Gas Bubbles ◽  
Solid Particles ◽  
Gas Content ◽  
Dissolved Gas ◽  
New Instrument ◽  
Pass Through ◽  
Onset Of Cavitation

The rate of cavitation in liquid flow appears to be linked to the concentration and size distribution of gas bubbles and “weak” nuclei in the liquid used, as well as to the dissolved gas content. Consequently, the onset of cavitation is related to the tensile strength of the liquid, rather than the vapor pressure. The tensile strength of the liquid depends on the amount of gas in gas pockets (i.e., gas bubbles and gas absorbed at solid particles) suspended in the liquid and the shape of these gas pockets. An instrument will be described, which measures the tensile strength in a direct way. In this method a sample of liquid is made to pass through a pressure well, the minimum pressure of which can be adjusted.

Flow Configure in Vertical 180 Degree Turning Duct

2001 ◽  
Author(s):  
Lu Yuanwei ◽  
Zhou Fangde ◽  
Wang Yueshe ◽  
Qian Huanqun ◽  
Hu Zhihua
Keyword(s):  
Flow Pattern ◽  
Liquid Flow ◽  
Two Phase Flow ◽  
Vertical Tube ◽  
Experimental Result ◽  
Phase Flow ◽  
Two Phase ◽  
Vertical Part ◽  
Flow Situation ◽  
Gas Liquid Flow

Abstract Bend is applied in many industries, which exert an influence on fluid and make the flow complicate. The second flow caused by the bend is strong enough that the flow behind it very long can be affected, so it is hard to make the flow in it steady. The long-term unsteady flow can make the pipe fatigue, so make the tube crack and leak. It is important to improve this situation. In this paper a throttle is built in the exit of the bend to control the non-homogeneous flow inside the bend, which can overcome the disadvantage of bend in industrial application. Through computed the flow field behind the bend by water, we can see that the throttle can improve the flow situation and make the flow steady behind it. Applying this method to the gas-liquid flow, the experimental result showed that the void fraction behind the bend is alike the fully developed flow. It means that the throttle can improve the two-phase flow situation in the invert U bend. At last the gas-liquid flow pattern in-bend was studied by experiment and built the flow pattern map in the vertical parts of the invert U bend. It was found that the flow pattern in the vertical part of invert U bend is different from the fully developed gas-liquid flow in vertical tube. The throttle built in the bend make the unsteady region of two-phase flow being reduced.

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