NDLI: Liquids: The Holy Grail of Microfluidics Modeling

Content Provider	IEEE Xplore Digital Library
Author	Gad-el-Hak, M.
Copyright Year	2004
Description	Author affiliation: Virginia Commonwealth University (Gad-el-Hak, M.)
Abstract	Interest in microelectromechanical systems (MEMS) has experienced explosive growth during the past few years. Such small devices typically have characteristic size ranging from 1 mm down to 1 micron, and may include sensors, actuators, motors, pumps, turbines, gears, ducts and valves. Microdevices often involve mass, momentum and energy transport.Modeling gas and liquid flows through MEMS may necessitate including slip, rarefaction, compressibility, intermolecular forces and other unconventional effects. The continuum-based Navier-Stokes equations with either the traditional no-slip or slip-flow boundary conditions work only for a limited range of Knudsen numbers above which alternative models must be sought. These include molecular dynamics simulations (MD), Boltzmann equation, Direct Simulation Monte Carlo (DSMC), and other deterministic/probabilistic molecular models. The kinetic theory of gases defines well the boundaries for which the no-slip Navier-Stokes equations can accurately model the flow of a dilute gas. The same cannot be said about dense-gas and liquid flows where intermolecular interactions play a dominant role. Neither type of fluid has a well-advanced molecular-based theory, as is the case for dilute gases. The concept of mean free path is not very useful for liquids and the conditions under which a liquid flow fails to be in quasi-equilibrium state are not well defined. Such complex fluids can only be treated via hybrid continuum-molecular approaches, which approaches are still far from satisfactory at the present time. The present talk will address such issues and outline a blueprint for future developments.
Starting Page	332
Ending Page	337
File Size	323519
Page Count	6
File Format	PDF
ISBN	0769521894
DOI	10.1109/ICMENS.2004.1508970
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-08-25
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Liquids Microfluidics Fluid flow Micromechanical devices Navier-Stokes equations Gases Microelectromechanical systems Explosives Sensor phenomena and characterization Actuators
Content Type	Text
Resource Type	Article

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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