Measurement of oil entrainment rates and drop size spectra from coalescence filter media

Wurster, Sebastian; Kampa, D.; Meyer, Jörg; Müller, Thierry; Mullins, Benjamin J.; Kasper, Gerhard

doi:10.1016/j.ces.2015.04.012

Cited by 25 publications

(8 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The homogeneity of the LLS is measured by placing a fibre perpendicular to the LLS at different positions. The average photomultiplier anode voltage for the different fibre positions is measured to be 425 mV, and the maximum deviation of the photomultiplier anode voltage is 22% at a photomultiplier amplification voltage of 356 V. This LLS homogeneity is in accordance with Wurster et al, who measured a maximum deviation of 20 % [5].…”

Section: Calibration and Characterization Resultssupporting

confidence: 87%

“…A similar LLS-OPC was first presented by Wurster et al [ 5 , 6 ] for the detection of oil drops entrained from filter media at ambient temperature and without simultaneous video recording. Wurster expanded a 1 W, 532 nm laser beam (MGL-FN-532, manufacturer PhotonTec Berlin GmbH, Berlin, Germany) with a Gaussian intensity distribution to a 400 mm light sheet using a cylindrical lens.…”

Section: Introductionmentioning

confidence: 88%

See 1 more Smart Citation

A Novel Apparatus for Simultaneous Laser-Light-Sheet Optical Particle Counting and Video Recording in the Same Measurement Chamber at High Temperature

Zoller

Zargaran

Braschke

et al. 2022

Sensors

View full text Add to dashboard Cite

A novel apparatus was developed, to investigate the detachment of particle structures consisting of soot and ash from a single fibre or a fibre array in hot gas flow. Key features of the novel apparatus are operation at high temperatures while two different measurement techniques are applied simultaneously in the same measurement chamber to observe particle structure detachment from a loaded fibre array. A heated inlet can heat the air stream at the position of the fibre array up to 470 °C, allowing detachment investigations at temperatures relevant for the operation of, e.g., soot particle filters. The first measurement technique integrated in the setup is video recording of the fibre array, which gives qualitative information on the rearrangement or detachment of particulate matter on the fibre. Because it is often difficult to distinguish rearrangement and detachment from pure visual observations, a second measurement technique is applied. This technique is a laser-light-sheet optical particle counter, which can detect detached particle structures and determine their size. The measurable size range is 257 to 1523 µm for glass spheres. This paper presents and discusses the novel apparatus, its calibration and first detachment measurement results.

show abstract

Section: Calibration and Characterization Resultssupporting

confidence: 87%

Section: Introductionmentioning

confidence: 88%

A Novel Apparatus for Simultaneous Laser-Light-Sheet Optical Particle Counting and Video Recording in the Same Measurement Chamber at High Temperature

Zoller

Zargaran

Braschke

et al. 2022

Sensors

View full text Add to dashboard Cite

show abstract

“…The measurement technique to characterize the size and moment of detachment of particle structures was constructed based on the measurement method designed by Wurster et al for continuous online detection of entrained oil droplets [20,21]. Moreover, the size of the detached particle structures gives a rough estimation of whether the structures will remain somewhere on the surface of the filter, re-deposit in the subsequent filter matrix of the filter or penetrate through the whole filter medium.…”

Section: Introductionmentioning

confidence: 99%

Experimental Detection of Particle Structures Detachment from a Stretchable Single Fiber during Multiple Consecutive Stretching Cycles

2022

View full text Add to dashboard Cite

The deposited particulate material within a fibrous filter affects the pressure drop which develops through three different stages. The implementation of a time-adjustable matrix is intended to cause detachment of particle structures from fibers within the upstream layers at low flow velocities. The deposited particle structures are transported further within the filter and clear up void space for an extension of filter service life. As in previous studies observed fiber stretching initiate cracks and following detachment of particle structures with a simultaneously applied airflow. For complete detachment of the particle structure, five consecutive stretching cycles are performed in this study. The elongation velocity, the flow velocity and the particle loading are varied. Using an image analysis technique and a laser-light measurement technique simultaneously, the cumulative fraction of detached particle structures and the size of detached particle structures are determined. A high initial particle loading on the fiber induces early detachment of larger structures from the fiber. The size of detached structures is increased by the increase of the elongation velocity. The mean value remains almost constant whether the elongation velocity or superficial velocity are increased. For small initial structures on the fiber, a decrease in superficial velocity causes detachment of larger particle fragments.

show abstract

“…Fibrous materials have by far been the most prominent means of droplet separation from a flowing gas or liquid. Such fibrous filters, referred to as coalescing filtration media, are used to remove aerosolized oil droplets from compressed gas (downstream of a compressor), remove oil droplets from fume gases (furnaces, engines, chemical reactions...), and separate dispersed water droplets from diesel/oils, among many other applications. , Coalescing media are designed to collect fine droplets from the flow and allow them to coalesce and grow on the fibers and eventually migrate (drain) out of the system with the help of gravity. − Engineering high-efficiency coalescence filtration media requires a clear understanding of the dynamics of droplet migration in a fibrous structure, and that in turn requires the ability to quantify the force of adhesion between a droplet and a fiber (or an assembly of fibers). In fact, the performance deterioration of coalescence filtration media has been a long-standing problem in the separation/purification industry.…”

Section: Introductionmentioning

confidence: 99%

Centrifugal Detachment of Compound Droplets from Fibers

2021

View full text Add to dashboard Cite

This article presents the first experimental− computational study on the centrifugal detachment of a compound droplet (e.g., a primary water droplet cloaked by an immiscible oil) from a fiber. The work was intended to establish a method for quantifying the force needed to detach compound droplets of different compositions from a fiber. More importantly, our study was aimed at improving the understanding of the interplay between interfacial and external forces acting on a compound droplet during forceful detachment. The experiments were conducted using DI water, for the primary droplet, and silicone or mineral oil, for the cloaking fluid. It was observed from the experiments that the silicone-oil-cloaked droplets behave differently from the mineral-oil-cloaked droplets. It was also observed that detachment force decreases with increasing the oil-to-water volume ratio. The simulations were performed using the Surface Evolver (SE) finite element code programmed for the complicated four-phase (air, water, oil, and solid) interfacial problem at hand. Our simulations revealed the evolution of the interfacial forces between the interacting phases under an increasing external body force on the droplet. The simulations also allowed us to define effective interfacial tensions and contact angles for detaching compound droplets, for the first time. Reasonable agreement was observed between the experimental measurements and computational results.

show abstract

Measurement of oil entrainment rates and drop size spectra from coalescence filter media

Cited by 25 publications

References 44 publications

A Novel Apparatus for Simultaneous Laser-Light-Sheet Optical Particle Counting and Video Recording in the Same Measurement Chamber at High Temperature

A Novel Apparatus for Simultaneous Laser-Light-Sheet Optical Particle Counting and Video Recording in the Same Measurement Chamber at High Temperature

Experimental Detection of Particle Structures Detachment from a Stretchable Single Fiber during Multiple Consecutive Stretching Cycles

Centrifugal Detachment of Compound Droplets from Fibers

Contact Info

Product

Resources

About