Particle behavior on surfaces subjected to external excitations

Ziskind, G.; Fichman, M.; Gutfinger, C.

doi:10.1016/s0021-8502(99)00554-6

Cited by 48 publications

(35 citation statements)

References 19 publications

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“…The pulsed flow was generated by imposing a harmonic pressure gradient to a steady flow, thus increasing local shear rate and pressure at the interface deposit/liquid (Gillham et al, 2000). Ziskind et al (2000) studied the effect of mean and fluctuating shear stress components on the particles removal from the wall. They have shown the interest of oscillating flows in particles removal when the mean shear stress is not high enough.…”

Section: Introductionmentioning

confidence: 99%

Application of turbulent pulsating flows to the bacterial removal during a cleaning in place procedure. Part 2: Effects on cleaning efficiency

Blel

Legentilhomme

Bénézech³

et al. 2009

Journal of Food Engineering

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Pulsating turbulent flows effects on cleaning in place procedure of straight pipes were investigated for various pulsations parameters (frequency and amplitude) and mean velocities of the flow. Pulsations generation was made with a new system which allows high amplitude of pulsations. Experiments showed the contribution of the different pulsation parameters, in the removal of adhered bacterial spores, in addition to the effect of the mean velocity of the flow. A high level of the cleaning rate is observed despite the reduction of the magnitude of the mean velocity. This result can be explained by the effect of the two pulsations parameters (amplitude and frequency) which ensure a high wall shear rate. The study of the cleaning kinetics has shown the increase of the removal constant rate of spores using pulsed flow in comparison with the use of a steady turbulent flow.

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Section: Introductionmentioning

confidence: 99%

Application of turbulent pulsating flows to the bacterial removal during a cleaning in place procedure. Part 2: Effects on cleaning efficiency

Blel

Legentilhomme

Bénézech³

et al. 2009

Journal of Food Engineering

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“…As seen, the experimental data do not collapse into a single curve. The Strouhal number de ned above takes into account only the hydrodynamics of the jet, while jet-particle and particle-surface interactions (see Ziskind et al 2000), which play an important role in particle removal, are not accounted for.…”

Section: Resultsmentioning

confidence: 99%

“…Since total prevention of deposition cannot be achieved in practice, it becomes necessary to consider particle removal by various means, including uid ow over the particle-laden surface, high velocity air jets, or high-frequency sonic waves on the uid above the surface (Ziskind et al 1995(Ziskind et al , 1997(Ziskind et al , 2000. In the present work, we study particle removal by means of a pulsed high-speed air jet.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of Particle Removal from Surfaces by Pulsed Air Jets

Ziskind

Yarin

Peles

et al. 2002

Aerosol Science and Technology

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This work presents an experimental study of particle removal from surfaces by means of a pulsed air jet directed toward the particle-laden surface. During the experiments, solid particles were dispersed over the surface, forming a layer of particles that did not touch each other. Under these conditions, resuspension of an individual particle was independent of the number of particles and their location.We attempt to explain the observed phenomena by analogy to heat transfer enhancement by pulsed jets. It is expected that since pulsed jets are effective in surface cooling, their application to improved surface cleaning should be promising.For a pulsed jet, we investigated the effect of pulse frequency on particle removal. It was found that particle removal ef ciency could be signi cantly affected by the frequency of the jet. In particular, for a xed jet velocity, the ef ciency increases with frequency, reaches a maximum, and then decreases.

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“…The resuspension model is based on data reported by Reeks et al (1988) and Ziskind et al (2000). The Authors assumed that the adhesion and elastic reaction forces can be described by an equation of harmonic movement with dumping effect.…”

Section: Resuspension Modelmentioning

confidence: 99%

“…The stiffness coefficient and dumping coefficient can be calculated from material properties of particles, surface and fluid . The re-entrainment occurs when the distance between the surfaces of bodies exceeds value (Ziskind et al, 2000). 3.…”

Section: Resuspension Modelmentioning

confidence: 99%

Dynamics of particle loading in deep-bed filter. Transport, deposition and reentrainment

Przekop

Gradoń

2016

Chemical and Process Engineering

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Deep bed filtration is an effective method of submicron and micron particle removal from the fluid stream. There is an extensive body of literature regarding particle deposition in filters, often using the classical continuum approach. However, the approach is not convenient for studying the influence of particle deposition on filter performance (filtration efficiency, pressure drop) when nonsteady state boundary conditions have to be introduced. For the purposes of this work the latticeBoltzmann model describes fluid dynamics, while the solid particle motion is modeled by the Brownian dynamics. For aggregates the effect of their structure on displacement is taken into account. The possibility of particles rebound from the surface of collector or reentrainment of deposits to fluid stream is calculated by energy balanced oscillatory model derived from adhesion theory. The results show the evolution of filtration efficiency and pressure drop of filters with different internal structure described by the size of pores. The size of resuspended aggregates and volume distribution of deposits in filter were also analyzed. The model enables prediction of dynamic filter behavior. It can be a very useful tool for designing filter structures which optimize maximum lifetime with the acceptable values of filtration efficiency and pressure drop.

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Particle behavior on surfaces subjected to external excitations

Cited by 48 publications

References 19 publications

Application of turbulent pulsating flows to the bacterial removal during a cleaning in place procedure. Part 2: Effects on cleaning efficiency

Application of turbulent pulsating flows to the bacterial removal during a cleaning in place procedure. Part 2: Effects on cleaning efficiency

Experimental Investigation of Particle Removal from Surfaces by Pulsed Air Jets

Dynamics of particle loading in deep-bed filter. Transport, deposition and reentrainment

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