The Experts below are selected from a list of 218901 Experts worldwide ranked by ideXlab platform
Moran Bercovici - One of the best experts on this subject based on the ideXlab platform.
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electroosmotic flow dipole Experimental Observation and flow field patterning
Physical Review Letters, 2019Co-Authors: Federico Paratore, Evgeniy Boyko, Govind V Kaigala, Moran BercoviciAbstract:We Experimentally demonstrate the phenomenon of electroosmotic dipole flow that occurs around a localized surface charge region under the application of an external electric field in a Hele-Shaw cell. We use localized deposition of polyelectrolytes to create well-controlled surface charge variations, and show that, for a disk-shaped spot, the internal pressure distribution that arises results in uniform flow within the spot and dipole flow around it. We further demonstrate the superposition of surface charge spots to create complex flow patterns, without the use of physical walls.
Federico Paratore - One of the best experts on this subject based on the ideXlab platform.
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electroosmotic flow dipole Experimental Observation and flow field patterning
Physical Review Letters, 2019Co-Authors: Federico Paratore, Evgeniy Boyko, Govind V Kaigala, Moran BercoviciAbstract:We Experimentally demonstrate the phenomenon of electroosmotic dipole flow that occurs around a localized surface charge region under the application of an external electric field in a Hele-Shaw cell. We use localized deposition of polyelectrolytes to create well-controlled surface charge variations, and show that, for a disk-shaped spot, the internal pressure distribution that arises results in uniform flow within the spot and dipole flow around it. We further demonstrate the superposition of surface charge spots to create complex flow patterns, without the use of physical walls.
Knut Jørgen Måløy - One of the best experts on this subject based on the ideXlab platform.
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Experimental Observation of Dissolution Finger Growth in Radial Geometry
Frontiers in Physics, 2019Co-Authors: Piotr Szymczak, Renaud Toussaint, Eirik Grude Flekkøy, Knut Jørgen MåløyAbstract:Reaction-infiltration instability refers to the morphological instability of a reactive fluid front flowing in a soluble porous medium. This process is important for many naturally occurring phenomena, such as the weathering and diagenesis of rocks, dissolution in salt deposits and melt extraction from the mantle. This paper is focused on experiments on dissolution finger growth in radial geometries in an analog fracture. In the experiments, pure water dissolves a plaster sample forming one of the fracture walls in a Hele-Shaw cell with controlled injection rate and aperture. The flow is directed inwards to the center, and we observe the reaction-infiltration instability developing along the relatively long perimeter of the plaster. Our Experimental results show a number of features consistent with the theoretical and numerical predictions on the finger growth dynamics such as screening and selection between the fingers. Statistical properties of the dissolved part evolution with time are also investigated.
Piotr Szymczak - One of the best experts on this subject based on the ideXlab platform.
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Experimental Observation of Dissolution Finger Growth in Radial Geometry
Frontiers in Physics, 2019Co-Authors: Piotr Szymczak, Renaud Toussaint, Eirik Grude Flekkøy, Knut Jørgen MåløyAbstract:Reaction-infiltration instability refers to the morphological instability of a reactive fluid front flowing in a soluble porous medium. This process is important for many naturally occurring phenomena, such as the weathering and diagenesis of rocks, dissolution in salt deposits and melt extraction from the mantle. This paper is focused on experiments on dissolution finger growth in radial geometries in an analog fracture. In the experiments, pure water dissolves a plaster sample forming one of the fracture walls in a Hele-Shaw cell with controlled injection rate and aperture. The flow is directed inwards to the center, and we observe the reaction-infiltration instability developing along the relatively long perimeter of the plaster. Our Experimental results show a number of features consistent with the theoretical and numerical predictions on the finger growth dynamics such as screening and selection between the fingers. Statistical properties of the dissolved part evolution with time are also investigated.
Govind V Kaigala - One of the best experts on this subject based on the ideXlab platform.
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electroosmotic flow dipole Experimental Observation and flow field patterning
Physical Review Letters, 2019Co-Authors: Federico Paratore, Evgeniy Boyko, Govind V Kaigala, Moran BercoviciAbstract:We Experimentally demonstrate the phenomenon of electroosmotic dipole flow that occurs around a localized surface charge region under the application of an external electric field in a Hele-Shaw cell. We use localized deposition of polyelectrolytes to create well-controlled surface charge variations, and show that, for a disk-shaped spot, the internal pressure distribution that arises results in uniform flow within the spot and dipole flow around it. We further demonstrate the superposition of surface charge spots to create complex flow patterns, without the use of physical walls.
