Optimal design of non‐Newtonian, micro‐scale viscous pumps for biomedical devices

Silva, A.K. da; Kobayashi, Marcelo H.; Coimbra, Carlos F.M.

doi:10.1002/bit.21165

Cited by 16 publications

(4 citation statements)

References 20 publications

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“…Several numerical modeling and optimization designs were presented according to the pumping mechanism. Da Silva et al [11] proposed a viscous pump with a cylindrical rotor set in the channel housing. By comparing sets of channel dimensions and the rotor eccentricity, the optimum model was obtained to maximize the mass flow rate per unit of shaft power consumption.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective hydraulic optimization and analysis in a minipump

Bin¹,

Luo²,

Yuan³

et al. 2015

Science Bulletin

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Section: Introductionmentioning

confidence: 99%

Multi-objective hydraulic optimization and analysis in a minipump

Bin¹,

Luo²,

Yuan³

et al. 2015

Science Bulletin

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“…Only a few studies are available which address variations due to non-Newtonian fluid flows on microscale or millimeter-scale pump performance. Of the relevant investigations, da Silva et al [5] and El-Sadi et al [6] described non-Newtonian flow behavior in micropumps. For the former study, optimization of devices for biomedical application is considered for configurations which are similar to the ones investigated by Sen et al [7].…”

Section: Introductionmentioning

confidence: 99%

Miniature Viscous Disk Pump: Performance Variations From Non-Newtonian Elastic Turbulence

Ligrani

Lund

Fatemi

2016

Journal of Fluids Engineering

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Within the present investigation, a miniature viscous disk pump (VDP) is utilized to characterize and quantify non-Newtonian fluid elastic turbulence effects, relative to Newtonian flow behavior. Such deviations from Newtonian behavior are induced by adding polyacrylamide to purified water. The VDP consists of a 10.16 mm diameter disk that rotates above a C-shaped channel with inner and outer radii of 1.19 mm and 2.38 mm, respectively. A channel depth of 230 μm is employed. Fluid inlet and outlet ports are located at the ends of the C-shaped channel. Experimental data are given for rotational speeds of 126 1/s, 188 1/s, 262 1/s, and 366 1/s, pressure rises as high as 700 Pa, and flow rates up to approximately 0.00000005 m3/s. Reynolds number ranges from 2.9 to 6.5 for the non-Newtonian polyacrylamide solution flows and from 51.6 to 149.8 for the Newtonian pure water flows. To characterize deviations due to non-Newtonian elastic turbulence phenomena, two new parameters are introduced, PrR and HCR, where HCR is the ratio of head coefficient (HC) for the polyacrylamide solution and head coefficient for the water solution, and PrR is the ratio of pump power for the polyacrylamide solution and pump power for the water solution. Relative to Newtonian, pure water flows, the polyacrylamide solution flows give pump head coefficient data, dimensional pressure rise data, slip coefficients (SCs), specific speed (SS) values, and dimensional power data, which show significant variations and differences as they vary with flow coefficient (FC) or dimensional volumetric flow rate. Also important are different ranges of specific speed (SS) for the pure water and polyacrylamide solutions, and a lower range of SC or slip coefficient values for the polyacrylamide solution flows, compared to the pure water flows. These variations are due to increased elastic turbulence losses, which occur as viscosity magnitudes increase and the elastic polymers are excited by mechanical stress, which causes them to extend, deform, stretch, and intertwine.

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“…Several numerical investigations appear in Refs. [2][3][4][5][6][7][8][9]. These studies in general model the viscous micropump using continuum assumption-based Navier-Stokes equations.…”

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Viscous micropump simulation by particle/continuum methods

Wang

Luo

Lei

et al. 2011

J. Shanghai Jiaotong Univ. (Sci.)

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A novel viscous micropump consisting of a cylindrical rotor eccentrically placed inside a microchannel is simulated by the two Volume-CAD (V-CAD) framework-based flow solvers, i.e., the direct simulation Monte Carlo (DSMC) package (named as V-DSMC) and the Navier-Stoke solver (named as V-Flow). V-DSMC is used in the case of the pump applied to gas, while V-Flow is applied to model the pump in the case of liquid working medium. The pumping performance curves under different liquid media with the variation of Reynolds number, as well as under different eccentricity factors are obtained. The performance and the flow filed characteristics are very sensitive to the tangential momentum accommodation coefficient in the case of gas medium. Three recirculations exist in the flow field, and the sizes of recirculation are different at the different operating points in a performance curve.A significant challenge that must be overcome to enable scientific and industrial applications of MEMS and NEMS (micro/nano-electro-mechanical systems) and LOC (lab-on-a-chip) technologies, the latter being an idea for miniaturized instrumentation and control systems, is the transport and pumping of small quantities of fluids. At the macroscale continuous mechanical pumps (i.e., excluding positive-displacement pumps) are based on conventional centrifugal impellers, but these conventional methods do not work at small scales for which the Reynolds number is very small, even less than unit, since centrifugal forces are negligible at this range. However, at small length scales a novel pump known as the viscous pump has been developed by Sen et al [1] . It is suited for hauling various fluids in microducts from gas to liquid. The simplicity in the design of the viscous pump is its major attractive feature for MEMS, NEMS and LOC applications. The viscous pump consists of a transverse-axial rotor eccentrically placed in a channel, so that the viscous resistance between the small and large gaps as well as between the cylinder and the channel walls generates a net flow along the channel. Several numerical investigations appear in Refs. [2][3][4][5][6][7][8][9]. These studies in general model the viscous micropump using continuum assumption-based Navier-Stokes equations. In the case of liquid, the molecular length scale is small, and the continuum model may be still valid [10] . However, for a gas at the micro or nano scale, the rarefaction effect, the surface dominant effect and the compressibility effect may become significant, thus the flow solver must be able to accurately reflect the unique properties at this scale and the Navier-Stokes equations may not be available any more.The Volume-CAD (V-CAD) system as feature of Kitta Cube [11] can act as the platform for storing and handling both of the geometry data and volume data by representing them as attributes of a set of cells. The generated Cartesian background grids offer an efficient and elegant way of modeling complicated surface that cannot be described analytically. Through the V-CAD system...

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Optimal design of non‐Newtonian, micro‐scale viscous pumps for biomedical devices

Cited by 16 publications

References 20 publications

Multi-objective hydraulic optimization and analysis in a minipump

Multi-objective hydraulic optimization and analysis in a minipump

Miniature Viscous Disk Pump: Performance Variations From Non-Newtonian Elastic Turbulence

Viscous micropump simulation by particle/continuum methods

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