Numerical modelling of dielecrophoresis (DEP) effect in microchannel flow controller - comparison of calculation methods

Lackowski, M.; Nowakowska, H.

doi:10.15199/48.2016.08.26

Cited by 2 publications

(3 citation statements)

References 4 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The results agreed perfectly in all cases. The calculations were performed for the same liquid that was used in the microchannel described in [21][22][23], namely isopropanol. Its physical properties were taken assuming a temperature of 25 °C and are as follows (Dortmund Data Bank http://ddbonline.ddbst.com): the density 786 kg m −3 , surface tension 20.9 mN m −1 , dynamic viscosity 2.34 mPa s, relative electric permittivity 19.9 and contact angle 0 rad [46].…”

Section: Numerical Resultsmentioning

confidence: 99%

“…However, an optim ization of this device, particularly with the goal to control its time-response properties, is required because the controller is meant as a part of a feedback system for temperature regulation. To this end, knowledge of the influence of the forces on the liquid height-of-rise is necessary because its value is correlated with the liquid flow rate in the controller [21][22][23].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamics of dielectric liquid rise between parallel electrodes under capillary and dielectrophoretic forces

Lackowski¹,

Nowakowska²

2018

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

An electric field can affect a dielectric fluid flow and this effect can be used especially in micro-devices. A differential second order equation for a temporal dependence of the liquid height-of-rise in a microchannel made of two parallel plates is modified to account for a liquid dielectrophoretic (LDEP) force, which is a result of an electric field occurring between the plates. This equation takes into account capillary, LDEP, inertial and gravitational forces for viscous, incompressible fluid. It is shown that the LDEP force between parallel electrodes does not depend on the meniscus shape. Time dependences of the height-of-rise, velocity of the liquid front and forces acting on the liquid are obtained for two cases of the initial liquid height and several voltage values applied to the plates, and presented in a dimensionless form. Numerical calculations and experimental verification are performed for isopropanol as a working liquid. We have found that for this liquid, adverse effects such as strong heating and boiling are small enough to observe the LDEP phenomenon between parallel electrodes. Results of the experiment conducted for a 5 mm long and 300 µm wide channel with walls made of copper in the time interval 0-10 s, which is sufficient to achieve a stationary state, are presented. They are consistent with the theory within the voltage range up to 330 V. The highest achieved LDEP height-of-rise was about 13 mm. For higher voltage, Joule heating prevents from reaching a stationary state.

show abstract

Section: Numerical Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Dynamics of dielectric liquid rise between parallel electrodes under capillary and dielectrophoretic forces

Lackowski¹,

Nowakowska²

2018

J. Phys. D: Appl. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

“…However, optimization of this device, particularly with the goal to control its time-response properties, is required if the controller is to be treated as a part of a feed-back system for temperature regulation. To this end, knowledge of the influence of the forces on the fluid height of rise is necessary because its value is correlated with the liquid flow rate in the controller [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of the dielectrophoretic forces influence on height of rise of fluid in a capillary system for boiling control in microchannel

Lackowski

Karwacki

2017

ZN PRz Mechanika

Self Cite

View full text Add to dashboard Cite

Flow control in microchannels is one of the key issues in many areas of modern technology, such as medicine, bio-engineering, chemistry and, in recent years, also in problems of thermodynamic processes control. This paper presents the results of experimental studies on the dynamics of liquid movement between the walls of a microchannel, which is the effect of the electric field applied to the walls (the dielectrophoresis phenomenon). The presented results fill a gap in the literature, being also an important material for the determination of the device key parameters, such as the height of the microchannel electrodes, frequency and amplitude of applied voltage, the selection of periods with and without voltage, all of which affect the operation of the device.

show abstract

Numerical modelling of dielecrophoresis (DEP) effect in microchannel flow controller - comparison of calculation methods

Cited by 2 publications

References 4 publications

Dynamics of dielectric liquid rise between parallel electrodes under capillary and dielectrophoretic forces

Dynamics of dielectric liquid rise between parallel electrodes under capillary and dielectrophoretic forces

Experimental analysis of the dielectrophoretic forces influence on height of rise of fluid in a capillary system for boiling control in microchannel

Contact Info

Product

Resources

About