Exploring the precision of backlight optical imaging in microfluidics close to the diffraction limit

Vega, E. J.; Montanero, J. M.; Ferrera, C.

doi:10.1016/j.measurement.2011.03.020

Cited by 30 publications

(16 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 9 shows the minimum value F min of the free-surface radius as a function of the time to the pinching τ measured for several values of liquid bridge slenderness and volume. As can be observed, the free-surface radius was measured with a small spatial uncertainty for values down to 4 μm (about 2 times the pixel size), which shows the capabilities of the image processing technique [50]. The figure also shows the numerical solution of the full Navier-Stokes equations.…”

Section: Breakupmentioning

confidence: 72%

“…To this end, we combined the solutions of both the linearized and full Navier-Stokes equations with experimental data obtained with a superresolution image processing technique [50]. The critical role played by the liquid bridge volume in this stability limit was verified experimentally.…”

Section: Discussionmentioning

confidence: 99%

“…The images of the liquid bridge at equilibrium were processed by the theoretical image fitting analysis axisymmetric interface method [49] to measure the surface tension. The free-surface position was determined by processing the images with a superresolution technique at the subpixel level [50]. In the experiments, the liquid bridge volume was reduced in steps of 0.1 μl by suctioning the liquid at a flow rate of 36 μl/h.…”

Section: Experimental Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Dynamics of an axisymmetric liquid bridge close to the minimum-volume stability limit

et al. 2014

Self Cite

View full text Add to dashboard Cite

We analyze both theoretically and experimentally the dynamical behavior of an isothermal axisymmetric liquid bridge close to the minimum-volume stability limit. First, the nature of this stability limit is investigated experimentally by determining the liquid bridge response to a mass force pulse for volumes just above that limit. In our experiments, the liquid bridge breakup takes place only when the critical volume is surpassed and is never triggered by the mass force pulse. Second, the growth of the small-amplitude perturbation mode initiating the liquid bridge breakage is measured experimentally and calculated from the linearized Navier-Stokes equations. The results of the linear stability analysis allow one to explain why liquid bridges with volumes just above the stability limit are so robust. Finally, the nonlinear process leading to the liquid bridge breakup is described from both experimental data and the solution of the full Navier-Stokes equations. Special attention is paid to the free-surface pinchoff. The results show that the flow becomes universal (independent of both the initial and boundary conditions) sufficiently close to that singularity and suggest that the transition from the inviscid to the viscous regime is about to take place in the final stage of both the experiments and numerical simulations.

show abstract

Section: Breakupmentioning

confidence: 72%

Section: Discussionmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Dynamics of an axisymmetric liquid bridge close to the minimum-volume stability limit

et al. 2014

Self Cite

View full text Add to dashboard Cite

show abstract

“…Small non-axisymmetric perturbations of the free-surface were ignored by considering the axisymmetric contour F = (x r − x l )/2. Details of the image processing technique are given elsewhere [14,15]. Finally, the jet's diameter d j was obtained as the average of 2F over a region where this quantity reached an almost constant value.…”

Section: Experimental Methodsmentioning

confidence: 99%

On the use of hypodermic needles in electrospray

Rebollo-Muñnoz

Montanero

Gañán‐Calvo

2013

EPJ Web of Conferences

Self Cite

View full text Add to dashboard Cite

Abstract.We present an experimental analysis of electrospray where the standard feeding capillary was replaced with a hypodermic needle. Both the current intensity and the jet diameter were measured for a variety of leaky-dielectric liquids. The results obtained with a feeding capillary and a hypodermic needle of similar dimensions were compared. An increase of the liquid conductivity was measured by assuming that the electric current obeys the same scaling law in both configurations. That increase was likely due to the electrochemical reaction taking place in the needle tip.

show abstract

“…Non-standard image processing techniques are to be used in order to get reliable results, especially for small-amplitude perturbations. Super-resolution methods for free surface detection have been sucesfully applied to both equilibrium [9,10] and dynamic [11,12] liquid shapes by using backlight illumination. In the present paper, we describe an experimental method to produce micrometer electrically charged jets (Sec.…”

Section: Introductionmentioning

confidence: 99%

An experimental technique to measure the capillary waves in electrified microjets

Vega

Montanero

Rebollo-Muñoz

2012

EPJ Web of Conferences

View full text Add to dashboard Cite

show abstract

Exploring the precision of backlight optical imaging in microfluidics close to the diffraction limit

Cited by 30 publications

References 45 publications

Dynamics of an axisymmetric liquid bridge close to the minimum-volume stability limit

Dynamics of an axisymmetric liquid bridge close to the minimum-volume stability limit

On the use of hypodermic needles in electrospray

An experimental technique to measure the capillary waves in electrified microjets

Contact Info

Product

Resources

About