A unified model to predict flow pattern transitions in horizontal and slightly inclined two-phase gas/shear-thinning fluid pipe flows

2016 ◽  
Vol 84 ◽  
pp. 279-291 ◽  
Author(s):  
Davide Picchi ◽  
Pietro Poesio
Keyword(s):  
Flow Pattern ◽  
Shear Thinning ◽  
Unified Model ◽  
Two Phase ◽  
Pipe Flows ◽  
Shear Thinning Fluid

scholarly journals Liquid–Liquid Flows with Non-Newtonian Dispersed Phase in a T-Junction Microchannel

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 335
Author(s):  
Anna Yagodnitsyna ◽  
Alexander Kovalev ◽  
Artur Bilsky
Keyword(s):  
Flow Pattern ◽  
Dynamic Viscosity ◽  
Slug Flow ◽  
Shear Thinning ◽  
Continuous Phase ◽  
Immiscible Liquid ◽  
Dispersed Phase ◽  
Effective Dynamic ◽  
Liquid Flows ◽  
Shear Thinning Fluid

Immiscible liquid–liquid flows in microchannels are used extensively in various chemical and biological lab-on-a-chip systems when it is very important to predict the expected flow pattern for a variety of fluids and channel geometries. Commonly, biological and other complex liquids express non-Newtonian properties in a dispersed phase. Features and behavior of such systems are not clear to date. In this paper, immiscible liquid–liquid flow in a T-shaped microchannel was studied by means of high-speed visualization, with an aim to reveal the shear-thinning effect on the flow patterns and slug-flow features. Three shear-thinning and three Newtonian fluids were used as dispersed phases, while Newtonian castor oil was a continuous phase. For the first time, the influence of the non-Newtonian dispersed phase on the transition from segmented to continuous flow is shown and quantitatively described. Flow-pattern maps were constructed using nondimensional complex We0.4·Oh0.6 depicting similarity in the continuous-to-segmented flow transition line. Using available experimental data, the proposed nondimensional complex is shown to be effectively applied for flow-pattern map construction when the continuous phase exhibits non-Newtonian properties as well. The models to evaluate an effective dynamic viscosity of a shear-thinning fluid are discussed. The most appropriate model of average-shear-rate estimation based on bulk velocity was chosen and applied to evaluate an effective dynamic viscosity of a shear-thinning fluid. For a slug flow, it was found that in the case of shear-thinning dispersed phase at low flow rates of both phases, a jetting regime of slug formation was established, leading to a dramatic increase in slug length.

Hydrodynamics of gas/shear-thinning liquid two-phase flow in a co-flow mini-channel: Flow pattern and bubble length

2020 ◽  
Vol 32 (9) ◽  
pp. 092004
Author(s):  
Wen Yuan Fan ◽  
Shuai Chao Li ◽  
Li Xiang Li ◽  
Xi Zhang ◽  
Meng Qi Du ◽  
...  
Keyword(s):  
Flow Pattern ◽  
Channel Flow ◽  
Two Phase Flow ◽  
Shear Thinning ◽  
Phase Flow ◽  
Two Phase ◽  
Bubble Length

Studies on two-phase co-current air/non-Newtonian shear-thinning fluid flows in inclined smooth pipes

2007 ◽  
Vol 33 (9) ◽  
pp. 948-969 ◽  
Author(s):  
Jing-yu Xu ◽  
Ying-xiang Wu ◽  
Zai-hong Shi ◽  
Li-yun Lao ◽  
Dong-hui Li
Keyword(s):  
Fluid Flows ◽  
Shear Thinning ◽  
Two Phase ◽  
Shear Thinning Fluid

Experimental Investigation of Flow-Induced Vibration in Gas/Shear-Thinning Liquid Flows in Vertical Pipe

2020 ◽  
Author(s):  
Ruinan Lin ◽  
Ke Wang ◽  
Qing Li ◽  
Narakorn Srinil ◽  
Fangjun Shi
Keyword(s):  
Newtonian Fluid ◽  
Industrial Process ◽  
Flow Region ◽  
Shear Thinning ◽  
Maximum Energy ◽  
Internal Diameter ◽  
Flow Induced Vibration ◽  
Two Phase ◽  
Liquid Flows ◽  
Shear Thinning Fluid

Abstract The non-Newtonian shear-thinning fluid widely exists in the industrial process and the rheology exerts a significant influence on the flow pattern transition and flow-induced vibration (FIV). However, studies on the rheology effect of the liquid phase in the vertical upward two-phase flows are quite lacking due to the complexity of non-Newtonian fluid properties. In the present study, the vertical upward gas/shear-thinning liquid flows experiments are conducted on a rigid acrylic pipe with an internal diameter of 20 mm. Three different Carboxymethyl Cellulose (CMC) solutions are used as the non-Newtonian fluid, aimed at capturing a two-phase flow regime transition including the vertical slug, churn and annular flows. The results indicate that the maximum energy spectral densities of vibration occur at the slug-to-churn flow transition boundary at low liquid velocities and the annular flow region under high liquid velocities, respectively. The effects of the rheology of the shear-thinning fluid in terms of the flow patterns and FIV are also presented and discussed.

scholarly journals Two-phase power-law modeling of pipe flows displaying shear-thinning phenomena

1993 ◽  
Author(s):  
Jianmin Ding ◽  
R.W. Lyczkowski ◽  
W.T. Sha
Keyword(s):  
Power Law ◽  
Shear Thinning ◽  
Two Phase ◽  
Pipe Flows
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