Electroosmotic flow profile distortion due to Laplace pressures at the end reservoirs
| Autor: | Santiago Hernández Sánchez, Arturo Bianchetti, J.M. Cabaleiro |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Ciencias Físicas
Flow (psychology) Hydrostatic pressure PRESIONES DE LAPLACE Analytical chemistry 02 engineering and technology Curvature 01 natural sciences MICROFLUIDICA Materials Chemistry Pressure gradient Physics Plug flow Física de los Fluidos y Plasma Laplace transform ELECTROCINÉTICA 010401 analytical chemistry Time constant Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Electronic Optical and Magnetic Materials Adverse pressure gradient FLUJO ELECTROOSMOTICO 0210 nano-technology CIENCIAS NATURALES Y EXACTAS |
| Zdroj: | Microfluidics and Nanofluidics. 20 |
| ISSN: | 1613-4990 1613-4982 |
| Popis: | The build-up of pressure-driven backflows is a known drawback to electroosmotic plug flow. We have studied the characteristic time constant of these pressure gradients build-up as a function of various geometrical variables of the problem through μPIV measurements. Previous models based on hydrostatic pressure difference (syphoning) cannot explain the dynamics of our experimental results. We have developed a model that relates these pressure-driven backflows to Laplace pressures, due to changes in the interface radii of curvature at the reservoirs. This model leads to an equation which was solved both numerically and, after linearisation, analytically. The characteristic time constants obtained show much better agreement with experimental data. Therefore, this model allows for predicting the time during which an acceptable electroosmotic flow profile will last for a given microchannel?reservoir design. Fil: Bianchetti, Arturo Abel. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Instituto Nacional de Tecnología Industrial. Centro de Electrónica e Informática; Argentina Fil: Hernández Sánchez, Santiago. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Ingeniería Mecánica. Laboratorio de Fluidodinámica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Cabaleiro, Juan Martin. Universidad de Buenos Aires. Facultad de Ingeniería. Departamento de Ingeniería Mecánica. Laboratorio de Fluidodinámica; Argentina. Universidad de la Marina Mercante. Facultad de Ingeniería. Laboratorio de Microfluidica y Plasmas; Argentina |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink