Flow field analysis in a spiral viscous micropump

Haik, Yousef; Kilani, Mohammad; Hendrix, Jason; Rifai, Omar Al; Galambos, Paul C.

doi:10.1007/s10404-006-0143-2

Cited by 9 publications

(4 citation statements)

References 10 publications

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“…When the cylinder rotates the difference in shear stresses on the lower and upper half of the cylinder creates a force imbalance that displaces the fluid. The viscous micropump was introduced by Sen et al (1996) and has been the subject of several research papers (Sharatchandra et al 1997;da Silva et al 2007;Haik et al 2007). …”

Section: Dynamic Micropumpsmentioning

confidence: 99%

Steady and unsteady flow analysis in microdiffusers and micropumps: a critical review

Nabavi

2009

Microfluid Nanofluid

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In recent research, there has been a growing interest in the analysis of flow through microdiffusers and micropumps in order to characterize and optimize the performance of these devices. In this review, the recent advances in the numerical and experimental analysis of the steady and pulsating flows through microdiffusers and valveless micropumps are surveyed. The differences between the performance of microdiffusers and micropumps in steady and unsteady flow regimes are described. Qualitative and quantitative discussions of the effects of different design parameters on the performance of microdiffusers and valveless micropumps in both steady and unsteady flow regimes along with the contradictory results reported in the literature in this regard are provided. In addition, a summary of the latest micropump technologies along with the advantages and disadvantages of each mechanism with the emphasis on the innovative and lessreviewed micropumps are presented. Two important types of fixed microvalves, as part of valveless micropumps are described in details. Experimental flow visualization of steady and pulsating flows through microdiffusers and micropumps as a useful tool for better understanding the underlying micro-fluid dynamics is discussed. The present review reveals that there are many possible areas of research in the field of steady and unsteady flows through microdiffusers and micropumps in order to understand the effects of all important design parameters on the performance of these devices. List of symbols uVelocity in x direction (m/s) v Velocity in y direction (m/s) u max Maximum velocity in x direction (m/s) Q Volumetric flow rate (m 3 /s) Q net Net flow rate (m 3 /s) q Density (kg/m 3 ) p Pressure (Pa) p 0 Static pressure (Pa) t Time (s) x Axial position (m) y Transverse position (m) T Excitation period (s) l Shear viscosity (kg/m s) m Kinematic viscosity (m 2 /s) Re = u max D h /m Reynolds number St = x D h /u max Strouhal number Ro = x D h 2 /m = Re.St Roshko number Wo = D h /d Womersley number V Volume-average velocity (m/s) P Maximum pressure (Pa) Dp Frictional pressure drop (Pa) g Diffuser efficiency g max Maximum diffuser efficiency n d Total pressure loss coefficient in the diffuser direction n n Total pressure loss coefficient in the nozzle direction

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Section: Dynamic Micropumpsmentioning

confidence: 99%

Steady and unsteady flow analysis in microdiffusers and micropumps: a critical review

Nabavi

2009

Microfluid Nanofluid

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“…For spiral-channel viscous pumps, the channel has a spiral shape and a rotating upper boundary is used to drive the flow around the spiral. Spiral curvature and stream function solutions for analyzing the spiralchannel pump have been reported by Kilani and AlSalaymeh (2007) and Haik, Kilani, Hendrix, Rifai, and Galambos (2007). Compared to disk and spiral-channel viscous pumps, the structure of the cylinder pump is much simpler.…”

Section: Introductionmentioning

confidence: 98%

Flow dynamical behavior and performance of a micro viscous pump with unequal inlet and outlet areas

et al. 2016

Engineering Applications of Computational Fluid Mechanics

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The micro viscous pump is an important type of fluidic device. Optimizing the working performance of the pump is crucial for its wider application. A micro viscous pump design with unequal inlet and outlet areas is proposed in this paper. The flow field of the viscous pump is investigated using 2D laminar simulations. The mass flow rate and driving power are studied with different opening angles. The effects of the Reynolds number and the pressure load on the working performance are discussed in detail. Flow structures and vortex evolution are analyzed. With larger inlet and outlet areas, a higher mass flow rate is obtained and less driving power is achieved. A high pressure load results in a reduction in mass flow rate and an increase in driving power. Pumps with large opening angles are more susceptive to the Reynolds number and the pressure load. The adverse impact of the pressure load can be reduced by increasing the rotor speed. The vortex structure is affected by the geometric and operating parameters in the flow field. The flow dynamical behavior of the viscous pump exerts significant influence on its pumping ability. The present work gives rise to performance improvements for the micro viscous pump.

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“…12 Non-mechanical micropumps have no moving parts and drive the fluid directly using electric, magnetic, or other energy. Electrohydrodynamic, 13 magnetohydrodynamic, 14 electroosmotic, 15 electrowetting, 16 and viscous 17 micropumps, all fall into this category.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical study of flow characteristics of flat-walled diffuser/nozzles for valveless piezoelectric micropumps

Cai

Deng

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part C:

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The flat-walled diffuser/nozzles are classified into two types, i.e. Tube I and Tube II, based on their different flow resistance characteristics. Tube I has less pressure loss coefficients in the diffuser direction than the nozzle direction, and Tube II has larger pressure loss coefficients in the diffuser direction than the nozzle direction. This work focuses on the characterization of the diffuser efficiency, and flow rectification of these two types of diffuser/nozzles. The characterization is performed with diverging angles in the range of 5°–60° and length–width ratios in the range of 1–20, and the pressure drop ranging from 1 to 10 kPa. The results show that with the increase in pressure drop and the decrease in length–width ratio, Tube I type of diffuser/nozzles can change to Tube II. For Tube I type of diffuser/nozzles, the smaller the diverging angle and the longer the length, the better the performance. For Tube II type of diffuser/nozzles, the larger the diverging angle and shorter the length, the better the flow rectification performance. Simulation results match well with the experiment data. Of particular interest, simulation of the diffuser flow fields suggests that the flow separation has a significant impact on pressure loss coefficients in the diffuser direction.

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Flow field analysis in a spiral viscous micropump

Cited by 9 publications

References 10 publications

Steady and unsteady flow analysis in microdiffusers and micropumps: a critical review

Steady and unsteady flow analysis in microdiffusers and micropumps: a critical review

Flow dynamical behavior and performance of a micro viscous pump with unequal inlet and outlet areas

Experimental and numerical study of flow characteristics of flat-walled diffuser/nozzles for valveless piezoelectric micropumps

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