Aerosol-mist coalescing filters – A review

Mead-Hunter, Ryan; King, Andrew; Mullins, Benjamin J.

doi:10.1016/j.seppur.2014.06.057

Cited by 101 publications

(50 citation statements)

References 107 publications

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“…Aerosol oil mists, tiny oil colloid suspending in air, are generated from a diversity of industrial processes where oil are involved, such as power generation, gas transmittance, machine sealing and lubrication . Oil mist emission often causes damage to machines, corrosion, contamination of working areas, and air pollution contributing to the ill health .…”

Section: Introductionmentioning

confidence: 99%

“…The overall capture efficiency (η T ) of a fibrous filter can be theoretically described as:

η_{normalT} = 1 - \exp ([], - \frac{4 η_{F} α Z f}{π false(1 - α false) false(1 - S_{e} false) d_{f}})

(where Z is filter thickness, α is packing density, and d f is mean fiber diameter). Here η F is single fiber efficiency, which is determined by different mechanisms such as inertia impaction, interception, diffusion and gravitational setting . The saturation ( S e ) can be calculated by the equation:

S_{normale} = 0.0829 {(\frac{α Z}{d_{f}})}^{- 0.321} C a_{normaln}^{- 0.431}

, and

C a_{normaln} = (\frac{Q μ}{A σ \cos θ}) (\frac{normalΔ P_{w}}{normalΔ P_{0}})

is capillary number (where Q is volumetric flow rate, μ is liquid viscosity, A is contact area, σ is liquid surface tension, θ is the contact angle of oil on fiber surface, Δ P w is the pressure drop of the saturated filter, and Δ P 0 is the pressure drop across a clean filter).…”

Section: Introductionmentioning

confidence: 99%

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High‐Efficiency Low‐Resistance Oil‐Mist Coalescence Filtration Using Fibrous Filters with Thickness‐Direction Asymmetric Wettability

Wei

Zhou

Chen

et al. 2018

Adv Funct Materials

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Conventional aerosol filters typically have homogeneous wettability with limited filtration ability especially for small oil mists. Increasing filtration efficiency using thicker filter pad or finer fibers both result in considerable increase of pressure drop, which adversely increases energy consumption. It remains a challenge to develop effective filter materials that can effectively remove oil mists from air at a low flow resistance. Here, a novel concept about improving oil mist filtration efficiency without apparently increasing pressure drop using a fibrous filter with asymmetric wettability across the thickness is demonstrated. Dip-coating and single-side electrospraying are used to make fibrous filter have a homogeneous superoleophobicity or directional oil-transport function. When the two are combined together, they show a filtration efficiency as high as 99.45% for small oil mists (size 0.01-0.8 µm) and nearly 100% for large oil mists (size 0.5-20 µm) with a pressure drop of 9.29 kPa. With the same thickness and fibrous structure, our directional oil-transport/superoleophobic filter has higher quality factor than those with homogeneous oleophilic, superoleophobic, and asymmetric wettability of other superoleophilic/superoleophobic combinations, for both small and large oil mists. Directional oil transport-superoleophobic filters may lead to a novel, high-performance, low energy consumption oil mist separation technology.

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Section: Introductionmentioning

confidence: 99%

“…The overall capture efficiency (η T ) of a fibrous filter can be theoretically described as:

η_{normalT} = 1 - \exp ([], - \frac{4 η_{F} α Z f}{π false(1 - α false) false(1 - S_{e} false) d_{f}})

S_{normale} = 0.0829 {(\frac{α Z}{d_{f}})}^{- 0.321} C a_{normaln}^{- 0.431}

, and

C a_{normaln} = (\frac{Q μ}{A σ \cos θ}) (\frac{normalΔ P_{w}}{normalΔ P_{0}})

Section: Introductionmentioning

confidence: 99%

High‐Efficiency Low‐Resistance Oil‐Mist Coalescence Filtration Using Fibrous Filters with Thickness‐Direction Asymmetric Wettability

Wei

Zhou

Chen

et al. 2018

Adv Funct Materials

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show abstract

“…According to the results of that investigations, the initial efficiency may be described by means of the same mathematical apparatus as the filtration of solid particles (2). The reason is that a small droplet behaves in the same manner as spherical solid particles.…”

Section: Introductionmentioning

confidence: 99%

“…(2). However, we should remember that some amount of liquid is collected near the intersections of the fibers and some other places which play a minor role in the gas flow and droplet deposition.…”

mentioning

confidence: 99%

A simple numerical model of pressure drop dynamics during the filtration of liquid aerosols on fibrous filters

Gac

2015

Separation Science and Technology

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We present a new numerical model of filtration of liquid aerosols on fibrous filters.The main goal of the model is to describe the dependence of pressure drop on time during the nonstationary filtration process. The main difference between the current model and another ones, present in the literature is that it contains very few parameters -in its minimal form only two -and still describes the results of experimental measurements with a very good accuracy.We also estimate the dependence of the parameters of the model on the process conditions (i.e. gas flow velocity and the geometrical parameters of the filter) what enables to use the presented model to predict filtration process evolution in any fibrous filters.

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“…It is utilized in many branches of industry to obtain a pure gas for various applications as well as in environment protection processes to remove solid or liquid impurities from an exhausted gas. Thus, the mechanism of this process has been a subject of numerous experimental and numerical investigations recently [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%