Two Phase Flow Modelling for Low Concentration Spherical Particle Motion Through a Newtonian Fluid

Abstract Two-phase flow of gas/Newtonian and gas/non-Newtonian fluid through pipes occurs frequently in the chemical industry as well as in petroleum refining. Extensive experimental and theoretical research has been carried out on these systems in order to better understand their behaviour under different conditions regarding pressure, temperature and mixture concentrations. In this study, experimental apparatuses are used to investigate two-phase flow of gas/liquid systems through pipes. Air is used as the gas in the experiments, while water is used as the Newtonian fluid and Xanthan gum as the non-Newtonian fluid. The objectives of the study are to compare pressure drops when the same gas flows simultaneously with Newtonian and non-Newtonian fluids through tubes. The comparison here is between experimental pressure drops and estimated pressure drops, based on available empirical correlations for gas/Newtonian and gas/non-Newtonian flow. The trend exhibited by the pressure drops in both systems helps us to better understand the relationship between mixture flow pressure drops in Newtonian and non-Newtonian fluids and thereby develop a new experimental model. The tube diameter for the flow loop is 3/4 inch and the flow type ranges from transient to turbulent.

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Lattice Boltzmann simulation of two-phase flow involving non-Newtonian fluid in rough channels

Thermal Science and Engineering Progress ◽

10.1016/j.tsep.2019.02.008 ◽

2019 ◽

Vol 10 ◽

pp. 309-316 ◽

Cited By ~ 3

Author(s):

Bo Dong ◽

Yajin Zhang ◽

Xun Zhou ◽

Cong Chen ◽

Weizhong Li

Keyword(s):

Newtonian Fluid ◽

Lattice Boltzmann ◽

Two Phase Flow ◽

Phase Flow ◽

Two Phase ◽

Lattice Boltzmann Simulation

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Two-phase flow modelling for oxygen renewal estimation in vertical flow filter: luxury or necessity?

Water Science & Technology ◽

10.2166/wst.2009.311 ◽

2009 ◽

Vol 59 (12) ◽

pp. 2311-2319 ◽

Cited By ~ 6

Author(s):

N. Forquet ◽

A. Wanko ◽

P. Molle ◽

R. Mosé ◽

A.-G. Sadowski

Keyword(s):

Two Phase Flow ◽

Experimental Results ◽

Phase Flow ◽

Vertical Flow ◽

Air Entrapment ◽

Two Phase ◽

Sand Filters ◽

Water Flows ◽

Flow Modelling ◽

Hydraulic Load

Scientists and practitioners exhibit an increasing interest on effluent transfer and degradation modelling in Vertical Flow Sand Filters (VFSF) and Vertical Flow Constructed Wetland (VFCW). Modelling software used to this purpose is mainly monophasic: in the unsaturated zone, only water flow is taken into account and air phase influence is assumed to be negligible. In hydrology, many studies have point out the limitations of this assumption in order to quantify air phase movement but little has been done in the modelling of vertical flow filter. Despite its complexity, two-phase flow modelling allows to overcome these difficulties. In this work, we describe the complex air and water flows in the particular case of vertical flow filter fed intermittently using both numerical and experimental results. Complete different behaviour is observed depending on ponding occurs or not. If it does, flow is clearly influenced by air entrapment which is responsible of a reduction of the infiltration speed and of the drainage of a part of the water kept at the interface between the sand and the drainage layer. Finally, we study the dependency of oxygen income by convection on hydraulic load and compare numerical results with experimental results obtained on oxygen consumption.

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