Bistable diverter valve in microfluidics

Tesař, Václav; Bandalusena, H C Hemaka

doi:10.1007/s00348-010-0983-0

Cited by 48 publications

(30 citation statements)

References 22 publications

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“…In this grid there are total 368,522 cells, of which 9752 cells are pentahedrons, and the others are hexahedrons. The flow fields of fluidic oscillators are similar to that of the fluidic devices which have been numerically andexperimentally investigated.Tesař and Bandalusena [26] performed a study, by means of CFD computations and PIV (Particle Image Velocimetry) measurements, aimed at clarifying the behavior of a typical fluidic valve at low Reynolds numbers. By using simplified 2D computation CFD models, Wang et al [27] investigated the effect of varying structural parameters on the flow characteristics of the fluidic flowmeter, and they found that the numerical results were consistent with the experimental results.…”

Section: Methodology Of Simulation and Computational Domainsmentioning

confidence: 99%

“…As the dynamic mesh method only works with the first-order time advancement at present, the first-order upwind scheme was employed for the discretization [34]. As for the turbulence models in the simulation, the successful applications of the RNG-based κ-ε turbulence model for predicting the complex flow in the fluidic devices has been reported [26]. Thus, the RNG-based κ-ε turbulence model was used in this study.…”

Section: Boundary Conditions and Solving Strategiesmentioning

confidence: 99%

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Performance Study of a Fluidic Hammer Controlled by an Output-Fed Bistable Fluidic Oscillator

Zhang

Peng

et al. 2016

Applied Sciences

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Using a no-moving-component output-fed bistable fluidic oscillator to control fluid flows into a parallel path has been recognized for a considerable time, but as yet it is not so widely adopted as its obvious benefits would deserve. This may be attributed to the encountered problems associated with its jet behavior, complicated by its loading characteristics. In order to investigate a typical case for the application of the output-fed fluidic oscillator, this paper elaborates on the computational fluid dynamics (CFD) simulation method for studying the performance of a fluidic hammer controlled by an output-fed bistable fluidic oscillator. Given that couple mechanism exists between the flow field in the fluidic oscillator and the impact body, dynamic mesh technique and a user-defined function written in C programming language were used to update the mesh in the simulations. In terms of the evaluation of performance, the focus is on the single-impact energy and output power of the fluidic hammer in this study, to investigate the effect of different parameters of the impact body on them. Experimental tests based on the noncontact measuring method were conducted to verify the simulation results, by which the accuracy and reliability of this CFD simulation method was proved.

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Section: Methodology Of Simulation and Computational Domainsmentioning

confidence: 99%

Section: Boundary Conditions and Solving Strategiesmentioning

confidence: 99%

Performance Study of a Fluidic Hammer Controlled by an Output-Fed Bistable Fluidic Oscillator

Zhang

Peng

et al. 2016

Applied Sciences

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“…The mode of operation is this twopositional -ON and OFF. This is no shortcoming because the currently most popular fluidic device, bistable diverter amplifiers, operate in the very same mode [19]. It is therefore useful to copy on the fluidic side of the transducer the symmetric configuration of such amplifiers -as is seen in Fig.…”

Section: Transducer Proposalmentioning

confidence: 99%

Proposal for an electro/fluidic no-moving-part transducer based on wall-jet separation from a heated curved surface

Tesař

2015

EPJ Web of Conferences

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Abstract. Transducers for varying output flow from a fluidic device in dependence on electric input signal are increasing in importance -and yet no their design has been so far fully satisfactory. Except those that handle very extraordinary liquids (e.g. electro-rheologic), the transducers operate in two stages. The first stage is conversion into a motion or deformation of a mechanical component. In the second stage this mechanical effect acts on the output fluid flow. This signal conversion involving mechanical movements is a weak link between no-moving-parts electronics as well as no-moving-parts fluidics. Mechanical components complicate manufacturing, have tendency to get stuck or become worn -or, if deformed, may break (e.g. due to material fatigue). Their inertia limits the frequency range. Author here proposes a new transducer idea. The electric input heats the wall to which is attached a fluid jet, causing separation of the jet from the surface. Preliminary experiments show that relatively small heating suffices to change the flowfield substantially -and the reduction of the attachment wall to a thin metal foil can make the frequency range quite acceptable.

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“…The design of the valve was adapted from that previously designed by Tesar 6 . The dimensions were scaled up and some modifications to the geometry were incorporated to allow the additional SJ components to be incorporated.…”

Section: Design Of the Fluidic Switch And Synthetic Jet A Fluidmentioning

confidence: 99%