Development of Diffuser/Nozzle Based Valveless Micropump

Tanaka, Seiichi; Tsukamoto, Hiroshi; Miyazaki, Kôji

doi:10.1299/jfst.3.999

Cited by 9 publications

(8 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is in contradiction with the results of the steady flow regime where g decreases with increasing Re. • For the total pump, net flow rate increases with increasing Re, regardless the diffuser angle (Tanaka et al 2008;Sheen et al 2008;Hwang et al 2008). …”

Section: Effects Of Reynolds Numbermentioning

confidence: 95%

“…They found that net flow rate increased rapidly with increasing frequency, and reached the peak at f = 250 Hz, then decreased slowly with further increase in frequency. Tanaka et al (2008) developed a valveless micropump with a diffuser/nozzle shaped channel and a variable volume actuator which produced an oscillating flow. They measured the micropump characteristics for various angles of the microdiffuser (10°B h B 90°) and frequencies of the actuator (20 Hz B f B 140 Hz).…”

Section: Flow Separationmentioning

confidence: 99%

“…This is in contradiction with the results of the steady flow regime. • For the total pump, maximum net flow rate is achieved at a critical value of h (Tanaka et al 2008).…”

Section: Effects Of Diffuser Anglementioning

confidence: 99%

See 2 more Smart Citations

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

Nabavi

2009

Microfluid Nanofluid

View full text Add to dashboard Cite

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

show abstract

Section: Effects Of Reynolds Numbermentioning

confidence: 95%

Section: Flow Separationmentioning

confidence: 99%

See 1 more Smart Citation

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

Nabavi

2009

Microfluid Nanofluid

View full text Add to dashboard Cite

show abstract

“…Other contributions to the optimization of the nozzle/diffuser performance have been carried out numerically and experimentally over the last decade (e.g. [8,[12][13][14][15][16][17][18][19][20][21][22]). Gerlach and Wurmus [23] studied a piezoelectrically driven micropump in which a nozzle/diffuser valve was incorporated and concluded that the device could be used as a mixer/reactor chamber, in addition to operating as a micropump, due to the turbulence that was generated during its operation.…”

Section: Introductionmentioning

confidence: 99%

Efficient microfluidic rectifiers for viscoelastic fluid flow

Sousa

Pinho

Oliveira

et al. 2010

Journal of Non-Newtonian Fluid Mechanics

View full text Add to dashboard Cite

“…However, moving parts are prone to wear and difficult to manufacture. Besides, the movement of the passive valve and the volume change of the pump chamber are out of sync at high excitation frequency (Tanaka and Tsukamoto 2008). The mechanism of valveless piezoelectric micropump is based on the flow characteristics in the special tubes and avoid the disadvantages of the piezoelectric micropumps with valves.…”

mentioning

confidence: 99%