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Paper Information

Journal:   MECHANICAL ENGINEERING SHARIF (SHARIF: MECHANICAL ENGINEERING)   FALL 2015 , Volume 31-3 , Number 2; Page(s) 79 To 88.
 
Paper: 

EXPERIMENTAL STUDY OF FREQUENCY OF TAYLOR BUBBLES IN GAS-LIQUID TWO-PHASE FLOW IN A LARGE BEND

 
 
Author(s):  ANSARI M.R.*, HABIBPOUR B., SALIMI E., ADIBI P.
 
* DEPT. OF MECHANICAL ENGINEERING TARBIAT MODARES UNIVERSITY
 
Abstract: 

As Gas-liquid two-phase flow occurs frequently in many cases of industry, depending on the geometry of the duct, and the topography of the interface which creates dierent flow regimes. The Taylor bubble regime is one of the most possible patterns that exist over a wide range of gas-liquid flow rates. It is characterized by the motion of an elongated bubble among a continuous zone of liquid. The transient and intermittent nature of this regime causes sequence changes of pressure inside the channel and increases the fatigue and corrosion of the channel wall. In the present research, for its high importance, the frequency of Taylor bubbles was investigated in a large bend with three consecutive inclinations. At first, the flow regimes and flow diagrams of the inclined sections, as well as the horizontal section, in the upstream of the bend, were considered. It was noted that the Taylor bubble area stayed unchanged without the channel slope effect, and three areas were also coincident. As the bubbles merge and the bubble collapse phenomenon does not occur, the slope change of the channel does not aect the Taylor bubble frequency. A detailed explanation is given on Taylor bubble formation in the bend due to slug flow, which was generated on the upstream of the bend. The effect of gas and liquid flow rates on Taylor bubble frequency in the bend, as well as slug frequency at upstream of the bend, was also conducted in the present study. The results showed that an increase in gas flow rate decreases the Taylor bubble frequency in the whole range of liquid flow rates. In the flows with Resl < 22000, close correspondence exists between Taylor bubble frequency at the bending location and slug frequency at the upstream of the bend, and the increase in liquid flow rate decreases bubble frequency. However, the opposite result was found during flows with Resl > 22000. Finally, correlations were proposed to evaluate Taylor bubble frequency, based on phase super cial Reynolds number. These correlations are important for flow regime evaluation, in addition to the lack of similar subject matter in the literature.

 
Keyword(s): TWO-PHASE FLOW, BUBBLE FREQUENCY, PLUG REGIME, TAYLOR BUBBLES, INCLINED CCHANNEL
 
References: 
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