Topic
Hele-Shaw flow
About: Hele-Shaw flow is a research topic. Over the lifetime, 5451 publications have been published within this topic receiving 151320 citations.
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13 Jun 2005
TL;DR: There is a need for general purpose DSMC codes that can be readily applied by non‐specialist users to a wide variety of practical problems and the specifications that should be met are outlined and the currently available programs are noted.
Abstract: There is a need for general purpose DSMC codes that can be readily applied by non‐specialist users to a wide variety of practical problems. The specifications that should be met by such programs are outlined and the currently available programs are noted. The DS2V program for two‐dimensional and axially‐symmetric flows and the DS3V program for three‐dimensional flows are described in some detail. The “V” in the program names is to indicate the interactive visual characteristic of the programs. Both programs run in a time‐accurate mode and the flow sampling may be of the unsteady flow or, if a steady flow is established at sufficiently large times, of the steady flow. The gas model includes internal degrees of freedom, gas phase chemical reactions, and surface reactions. The initial state may include flow discontinuities that permit the study of shock tube flows and free shear flows. Solid surfaces may move in their own plane, a typical application being a rotating body in an axially‐symmetric flow. Alternatively, a surface may move in a normal direction to generate a moving shock wave for diffraction studies. Flow boundaries may be arbitrary combinations of solid surfaces and specified flows. Other options include periodic boundaries and constant pressure boundaries that have been developed especially for MEMS applications.
111 citations
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TL;DR: In this paper, the impact of shear-caused aperture changes (variable apertures and asperity contacts) and flow conditions (inertial term) upon nonlinear flow behavior is simulated by solving the Navier-Stokes equations.
110 citations
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TL;DR: Two microfluidic switches are described based on these two ways for controlling fluid flow through tangential microchannels and theoretical arguments that explain the observed dependence of the flow profiles on the aspect ratio of the channels are presented.
Abstract: This paper describes laminar fluid flow through a three- dimensional elastomeric microstructure formed by two microfluidic channels, fabricated in layers that contact one another face-to-face (typically at a 90 degrees angle), with the fluid flows in tangential contact. There are two ways to control fluid flow through these tangentially connected microchannels. First, the flow profiles through the crossings are sensitive to the aspect ratio of the channels; the flow can be controlled by applying external pressure and changing this aspect ratio. Second, the flow direction of an individual laminar stream in multiphase laminar flow depends on the lateral position of the stream within the channel; this position can be controlled by injecting additional streams of fluid into the channel. We describe two microfluidic switches based on these two ways for controlling fluid flow through tangential microchannels and present theoretical arguments that explain the observed dependence of the flow profiles on the aspect ratio of the channels.
109 citations
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TL;DR: In this article, the authors extended analytical solutions obtained for single U-and Z-type flow configurations to multiple U- and multiple Z-flow configurations of interest to fuel cell applications.
109 citations