scholarly journals Experimental study on air-water countercurrent flow limitation in a vertical tube based on measurement of film thickness behavior

2020 ◽  
Author(s):  
Jie Wan ◽  
Wan Sun ◽  
Jian Deng ◽  
Liang-ming Pan ◽  
Shu-hua Ding
Keyword(s):  
Experimental Study ◽  
Film Thickness ◽  
Vertical Tube ◽  
Countercurrent Flow ◽  
Flow Limitation

Countercurrent flow limitation in inclined channels with bends

1994 ◽  
Vol 152 (1-3) ◽  
pp. 379-388 ◽  
Author(s):  
S.M. Ghiaasiaan ◽  
R.E. Turk ◽  
S.I. Abdel-Khalik
Keyword(s):  
Countercurrent Flow ◽  
Flow Limitation ◽  
Inclined Channels

scholarly journals A study of film thickness and hydrodynamic entrance length in liquid laminar film flow along a vertical tube

AIChE Journal ◽  
2018 ◽  
Vol 64 (6) ◽  
pp. 2078-2088 ◽  
Author(s):  
Hongxia Gao ◽  
Xiao Luo ◽  
Ding Cui ◽  
Zhiwu Liang ◽  
Xiayi Hu ◽  
...  
Keyword(s):  
Film Thickness ◽  
Film Flow ◽  
Vertical Tube ◽  
Entrance Length ◽  
Laminar Film

scholarly journals Effects of Diameters on Countercurrent Flow Limitation at a Square Top End in Vertical Pipes

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Michio Murase ◽  
Koji Nishida ◽  
Toshihide Torige ◽  
Toshiya Takaki ◽  
Raito Goda ◽  
...  
Keyword(s):  
Water Level ◽  
Flow Rate ◽  
Liquid Flow ◽  
Liquid Flow Rate ◽  
Strong Relationship ◽  
Countercurrent Flow ◽  
Flow Limitation ◽  
Vertical Pipe ◽  
Surge Line ◽  
Inclined Pipe

The falling liquid flow rate under flooding conditions is limited at a square top end of a vertical pipe in the pressurizer surge line with the diameter of about 300 mm that consists of a vertical pipe, a vertical elbow, and a slightly inclined pipe with elbows. In this study, therefore, we evaluated effects of diameters on countercurrent flow limitation (CCFL) at the square top end in vertical pipes by using existing air-water data in the diameter range of D = 19-250 mm. As a result, we found that there was a strong relationship between the constant CK and the slope m in the Wallis-type correlation where the Kutateladze parameters were used for the dimensionless gas and liquid velocities. The constant CK and the slope m increased when the water level is increased in the upper tank h. CCFL at the square top end of the vertical pipes could be expressed by the Kutateladze parameters with CK = 1.53±0.11 and m = 0.97 for D ≥ 30 mm. The CK values were smaller for D = 19-25 mm than those for D ≥ 30 mm.

Countercurrent flow limitation at a square top end of vertical pipes and in a pressurizer surge line

2020 ◽  
Vol 363 ◽  
pp. 110624
Author(s):  
Toshiya Takaki ◽  
Michio Murase ◽  
Koji Nishida ◽  
Toshihide Torige ◽  
Akio Tomiyama
Keyword(s):  
Countercurrent Flow ◽  
Flow Limitation ◽  
Surge Line
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