Experimental study on interfacial area transport of two-phase bubbly flow in a vertical large-diameter square duct

2017 ◽  
Vol 67 ◽  
pp. 168-184 ◽  
Author(s):  
Xiuzhong Shen ◽  
Haomin Sun ◽  
Baoqing Deng ◽  
Takashi Hibiki ◽  
Hideo Nakamura
Keyword(s):  
Experimental Study ◽  
Bubbly Flow ◽  
Large Diameter ◽  
Interfacial Area ◽  
Two Phase ◽  
Square Duct ◽  
Interfacial Area Transport

Experimental study on interfacial area transport of a vertical downward bubbly flow

2003 ◽  
Vol 35 (1) ◽  
pp. 100-111 ◽  
Author(s):  
T. Hibiki ◽  
H. Goda ◽  
S. Kim ◽  
M. Ishii ◽  
J. Uhle
Keyword(s):  
Experimental Study ◽  
Bubbly Flow ◽  
Interfacial Area ◽  
Interfacial Area Transport

Interfacial Area Transport of Bubbly Flow Under Microgravity Environment

2003 ◽  
Author(s):  
Norihiro Fukamachi ◽  
Tatsuya Hazuku ◽  
Tomoji Takamasa ◽  
Takashi Hibiki ◽  
Mamoru Ishii
Keyword(s):  
Liquid Velocity ◽  
Constitutive Relations ◽  
Bubbly Flow ◽  
Interfacial Area ◽  
Visual Observation ◽  
Microgravity Environment ◽  
Axial Distance ◽  
Two Phase ◽  
Flow Measurements ◽  
Interfacial Area Transport

In relation to the development of the interfacial area transport equation, axial developments of one-dimensional void fraction, bubble number density, interfacial area concentration, and Sauter mean diameter of adiabatic nitrogen-water bubbly flows in a 9 mm-diameter pipe were measured by using an image-processing method under microgravity environment. The flow measurements were performed at four axial locations (axial distance from the inlet normalized by the pipe diameter = 7, 30, 45 and 60) under various flow conditions of superficial gas velocity (0.0083 m/s ∼ 0.022 m/s) and superficial liquid velocity (0.073 m/s ∼ 0.22 m/s). The interfacial area transport mechanism under microgravity environment was discussed in detail based on the obtained data and the visual observation. These data can be used for the development of reliable constitutive relations which reflect the true transfer mechanisms in two-phase flow under microgravity environment.

Effect of Gravity on Axial Development of Vertical Bubbly Flow

2006 ◽  
Author(s):  
Kazuya Abe ◽  
Yoshinori Hirose ◽  
Tatsuya Hazuku ◽  
Tomoji Takamasa ◽  
Takashi Hibiki
Keyword(s):  
Liquid Velocity ◽  
Constitutive Relations ◽  
Bubbly Flow ◽  
Interfacial Area ◽  
Stereo Image ◽  
Microgravity Environment ◽  
Axial Distance ◽  
Two Phase ◽  
Flow Measurements ◽  
Interfacial Area Transport

In relation to the development of the interfacial area transport equation, axial developments of void fraction profile, bubble number density, interfacial area concentration and Sauter mean diameter of adiabatic nitrogen-water bubbly flows in a 9 mm-diameter pipe were measured by using a Stereo Image-processing Method under normal- and micro-gravity environment. The flow measurements were performed at four axial locations (axial distance from the inlet normalized by the pipe diameter = 5, 20, 40 and 60) under various flow conditions of superficial gas velocity (0.00823–0.0303 m/s) and superficial liquid velocity (0.138–0.915 m/s). The interfacial area transport mechanism under microgravity environment was discussed in detail based on the obtained data and the visual observation. These data can be used for the development of reliable constitutive relations which reflect the rigorous transfer mechanisms in two-phase flow under microgravity environment.

CFD Analysis of S-Gamma Model Coupled With Two-Group Interfacial Area Transport Equations and AMUSIG Model for a Large Diameter Pipe

2020 ◽  
Author(s):  
Sungje Hong ◽  
Joshua P. Schlegel ◽  
Subash L. Sharma
Keyword(s):  
Bubbly Flow ◽  
Large Diameter ◽  
Flow Characteristics ◽  
Flow Regimes ◽  
Interfacial Area ◽  
Transport Equations ◽  
Interfacial Area Transport ◽  
Large Diameter Pipe ◽  
Void Fractions ◽  
Diameter Pipe

Abstract This paper describes the modeling of flow regimes beyond bubbly flows in a large diameter channel considering polydispersity and bubble induced turbulence using the Eulerian two-fluid approach. A two-bubble-group approach with two-group interfacial area transport equations (IATEs) is used to demonstrate flow phenomena in a large diameter pipe. Source and sink terms for mass and momentum exchanges between the two groups of bubbles and for bubble coalescence and breakup mechanisms are implemented. For predicting particle size and its distribution, S-Gamma (Sγ) model is used. The Sγ model with two-group IATEs are evaluated by comparing local distributions of void fractions and Sauter mean diameters with results of adaptive-multiple-size-group (AMUSIG) models and experimental dataset developed by Schlegel et al., (2012) for model validations. It shows that two-group IATEs with Sγ model predict reasonably accurate flow characteristics of beyond bubbly flow regimes, but also show shortcomings in their accuracies predicting local distributions, which imply that further studies for modeling of interfacial force are needed.

scholarly journals Experimental study and numerical simulation of interfacial area transport of bubbly flow

2015 ◽  
Vol 81 (831) ◽  
pp. 15-00303-15-00303 ◽  
Author(s):  
Atsushi ISHIKAWA ◽  
Masanori NAITOH ◽  
Kenji YOSHIDA ◽  
Isao KATAOKA
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Bubbly Flow ◽  
Interfacial Area ◽  
Interfacial Area Transport
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