Features of the flow of dispersions liquid-liquid type through a cylindrical microchannel

A surprising property of W/O water-hydrocarbon emulsions is revealed which is manifested during flow in microchannels called the phenomenon of dynamic blocking. Effect essence is emulsion flow through the microchannel section ceases with time despite the constantly acting pressure drop. It was experimentally obtained that the phenomenon is observed during the flow of various emulsions of different compositions. It is shown that the phenomenon manifests itself at high pressure gradients although a partial disruption of the dispersions occurs. The paper suggests a physical mechanism for blocking water-hydrocarbon emulsions in microchannels associated with the interaction of nanoscale shells of microdroplets of water.

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Dynamic blocking of W/O emulsion in a radially expanding flow in Hele-Shaw cell

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2006.1.018 ◽

2006 ◽

Vol 4 ◽

pp. 200-206

Author(s):

A.A. Rakhimov ◽

A.K. Akhmetov

Keyword(s):

Pressure Drop ◽

Capillary Channel ◽

Oil Emulsion ◽

Ultrasonic Fields ◽

Emulsion Flow ◽

Dynamic Blocking ◽

Hele Shaw Cell

It is studied the changing of structure of the radial expanding flow of highly concentrated stable reverse water-oil emulsion in a flat capillary channel. The effect of dynamic blocking is discovered, which is that despite the permanent pressure drop between the center and outer forming cells, the emulsion flow with time stands still. Microflows are shown in a state of ”blocking“. The various methods of influencing the system in a state of ”blocking“ are tested. It is found that the movement is resumed in a strong ultrasonic fields.

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Flow through porous media due to high pressure gradients

Applied Mathematics and Computation ◽

10.1016/j.amc.2007.10.038 ◽

2008 ◽

Vol 199 (2) ◽

pp. 748-759 ◽

Cited By ~ 18

Author(s):

K. Kannan ◽

K.R. Rajagopal

Keyword(s):

High Pressure ◽

Porous Media ◽

Pressure Gradients ◽

Flow Through Porous Media ◽

Flow Through

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Dynamic blocking and dispersions rheology at phase transition

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2011.1.007 ◽

2011 ◽

Vol 8 (1) ◽

pp. 77-91

Author(s):

A.T. Akhmetov ◽

M.V. Mavletov ◽

A.A. Valiev

Keyword(s):

Phase Transition ◽

Pressure Drop ◽

Rheological Properties ◽

Chemical Compounds ◽

Blocking Effect ◽

Dispersed Phase ◽

Simple Chemical ◽

Dynamic Blocking ◽

The Difference

In the flow in the microchannel of reverse water hydrocarbon emulsions, it is found the dynamic blocking effect. The essence of the effect is that the flow of the emulsion through the section of the microchannel stops with time, despite the permanent pressure drop. The difference of this work from previous ones is that for the experiments was prepared the emulsion of simple chemical compounds. For visualization of the structure formed in the capillary after blocking, the dispersed phase was introduced fluorescing component. It is studied and compared the rheological properties of the emulsion and formed from it in the phase transition suspension.

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Dynamic blocking phenomenon of W/O emulsions in section of reservoir

Proceedings of the Mavlyutov Institute of Mechanics ◽

10.21662/uim2008.1.002 ◽

2008 ◽

Vol 6 ◽

pp. 19-25

Author(s):

A.T. Akhmetov ◽

A.A. Rakhimov ◽

S.P. Sametov

Keyword(s):

Mass Transfer ◽

Pressure Drop ◽

Constant Pressure ◽

Blocking Effect ◽

Fracture Model ◽

Filtration Flow ◽

The Core ◽

Dynamic Blocking ◽

Different Diameters

On the basis of earlier experiments it is known that the flow of W/O emulsion in the slit-like model and in capillaries of different diameters leads to the fact that the mass transfer of the emulsion ceases with time at with a constant pressure drop. This phenomenon was called as a dynamic blocking effect. In the paper the radial-expanding flow of W/O dispersion in the fracture model and filtration flow in the core were studied at constant pressure drop for the presence of the blocking.

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