A Simplified Model for Determining Interfacial Position in Convergent Microchannel Flows

Autor:	D. L. Hitt, Nelson Macken
Rok vydání:	2004
Předmět:	Materials science Microchannel Mechanical Engineering Microfluidics Thermodynamics Reynolds number Mechanics Pipe flow Physics::Fluid Dynamics Viscosity symbols.namesake Planar Position (vector) symbols Fluidics
Zdroj:	Journal of Fluids Engineering. 126:758-767
ISSN:	1528-901X 0098-2202
Popis:	Previous experimental and computational studies have indicated that interfaces formed in steady, converging microchannel flows with similar liquids tend to be planar in nature under a variety of conditions relevant to micro-scale flows, including MEMS/microfluidic devices and even microcirculatory blood flows. Assuming a planar interface, we have developed an analytical framework to predict the fully developed interfacial location downstream of a convergence of identical microchannels. Results have been obtained for microchannels having rectangular, elliptical/circular and triangular cross-sections as a function of the inlet flow ratio. Two-dimensional results have also been obtained for fluids having unequal viscosities. Good agreement is found between this model and 3-D numerical simulations and experimental measurements provided that the flow inertia remains sufficiently small (Re≲10, typically). Where valid, application of this analytical, planar interface method represents a significant decrease in computational effort when compared to using CFD to determine interfacial positions.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::4cea47f5fbad5af34dfbd146b58d1604 https://doi.org/10.1115/1.1792272 Zobrazit plný text záznamu