Experimental Investigation of Particle Removal from Surfaces by Pulsed Air Jets

Ziskind, G.; Yarin, L. P.; Peles, S.; Gutfinger, C.

doi:10.1080/02786820252883883

Cited by 39 publications

(19 citation statements)

References 21 publications

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“…Monolayer deposits were examined in studies on the aerodynamic resuspension of particles by Corn and Stein (1965), Wen and Kasper (1989), Braaten et al (1990), John et al (1991), Wu et al (1992), Taheri and Bragg (1992), Nicholson (1993), Braaten (1994), Otani et al (1995), Smedley et al (1999), Reeks and Hall (2001), Ziskind et al (2002), Ibrahim et al (2003), Ibrahim et al (2004), Miguel et al (2005), Ibrahim and Dunn (2006), Ibrahim et al (2008), Jiang et al (2008), Goldasteh et al (in press), and Kassab et al (2013). For these studies, dust loads are on the order of 10 −5 to 1 g/m 2 .…”

Section: Wind Tunnel Studiesmentioning

confidence: 99%

Monolayer and Multilayer Particle Deposits on Hard Surfaces: Literature Review and Implications for Particle Resuspension in the Indoor Environment

Boor

Siegel

Novoselac

2013

Aerosol Science and Technology

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Particle deposits on indoor surfaces can be as complex and diverse as the indoor environments in which they exist. Dust loading can range over several orders of magnitude, suggesting the existence of different types of particle deposits. These deposits can be broadly classified as either a monolayer, in which particles are sparsely deposited on a surface, or a multilayer, in which particles are deposited on top of one another and there is particle-toparticle adhesion and interaction. Particles within these diverse structures of settled indoor dust can become airborne through a process known as resuspension, which can occur due to airflow in ventilation ducts or human activity indoors. The dust loading and deposit structure on an indoor surface may have important implications for resuspension in the indoor environment. This literature review provides a summary of dust loads found on indoor surfaces in field studies and classifies each dust load as either a monolayer or multilayer particle deposit. The article highlights the unique attributes associated with resuspension from both types of particle deposits by summarizing key findings of the experimental resuspension literature. The fundamental differences in the resuspension process between monolayer and multilayer deposits suggest that resuspension may vary considerably among the broad spectrum of dust loads found on indoor surfaces.

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Section: Wind Tunnel Studiesmentioning

confidence: 99%

Monolayer and Multilayer Particle Deposits on Hard Surfaces: Literature Review and Implications for Particle Resuspension in the Indoor Environment

Boor

Siegel

Novoselac

2013

Aerosol Science and Technology

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“…When cleaning a surface, the resuspension of deposited particles is promoted. The used gas is ordinary pressured air (Ziskind et al 2002) or CO 2 from dry ice (Liu et al 2012). The studied particle materials range from polystyrene latex (Otani et al 1995;Smedley et al 1999), styrene/divinylbenzene (Masuda et al 1994), wax (Otani et al 1995), to glass (Zhang et al 2002).…”

Section: Introductionmentioning

confidence: 99%

“…The particle-deposited substrate materials are glass (Smedley et al 1999), silicon (Otani et al 1995), copper (Gotoh et al 1996), and steel (Zhang et al 2002), among others. To enhance the particle removal, the jet impingement at different angles (Gotoh et al 1996), for different durations (Smedley et al 1999;Ziskind et al 2002), and for different pretreatments of deposited particles (Gotoh et al 1996;Gotoh and Masuda 1998), was extensively studied.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of jet-induced resuspension of indoor deposited particles

Mei

Zhang

Wang

2016

Aerosol Science and Technology

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Particles deposited on indoor surfaces may be resuspended and become airborne when disturbed by intensive jets. Depending on the intended purpose, the resuspension of deposited particles may be minimized or promoted. This investigation experimentally measured the resuspension of Arizona test dusts (ATDs) after a jet impingement. The simulating pulsed jets were created by a tube using compressed nitrogen gas. The jets were released into the test section in a wind tunnel that was cleaned by high-efficiency particulate air (HEPA) filters. The particle resuspension was evaluated by the dust-removal zone shapes on particle-laden plates, total dust-removal mass, and the number of airborne particles. The effects of the jet impingement heights, surface dust loads, and particle-laden plate surface roughness on particle resuspension were examined. This study revealed that sparsely deposited dusts indoors are more difficult to resuspend by jets than are densely deposited dusts. The jet impingement to a surface whose roughness is comparable to the particle diameters may cause severer airborne particle exposure than to surfaces with extremely small or large roughness values. For a high surface dust load, there is an optimal jet impingement height that can resuspend the maximum amount of the deposited dusts.

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“…The experimental results showed how the standoff distance, the impinging jet angle, inlet pressure and time elapsed strongly affect the particle removal efficiency. It was found that the most efficient particle removal occurred at 30° impinging angle, in conjunction with impinging distances from 13D to 20D (39 to 60mm) [15,16]. Vachon et al, conducted a study on dust mitigation where particulate matter strongly adheres to surfaces such as solar panels, clothing, equipment and mechanical devices by imposing a bound vortex surface impingement method [17].…”

Section: Introductionmentioning

confidence: 99%

A numerical study on high-pressure water-spray cleaning for CSP reflectors

Anglani¹,

Barry²,

Dekkers³

2016

AIP Conference Proceedings

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Abstract. Mirror cleaning for concentrated solar thermal (CST) systems is an important aspect of operation and maintenance (O&M), which affects solar field efficiency. The cleaning process involves soil removal by erosion, resulting from droplet impingement on the surface. Several studies have been conducted on dust accumulation and CSP plant reflectivity restoration, demonstrating that parameters such as nozzle diameter, jet impingement angle, interaxial distance between nozzles, standoff distance, water velocity, nozzle pressure and others factors influence the extent of reflectance restoration . In this paper we aim at identifying optimized cleaning strategies suitable for CST plants, able to restore mirror reflectance by high-pressure water-spray systems through the enhancement of shear stress over reflectors' surface. In order to evaluate the forces generated by water-spray jet impingement during the cleaning process, fluid dynamics simulations have been undertaken with ANSYS CFX software. In this analysis, shear forces represent the "critical phenomena" within the soil removal process. Enhancing shear forces on a particular area of the target surface, varying the angle of impingement in combination with the variation of standoff distances, and managing the interaxial distance of nozzles can increase cleaning efficiency. This procedure intends to improve the cleaning operation for CST mirrors reducing spotted surface and increasing particles removal efficiency. However, turbulence developed by adjacent flows decrease the shear stress generated on the reflectors surface. The presence of turbulence is identified by the formation of "fountain regions" which are mostly responsible of cleaning inefficiency. By numerical analysis using ANSYS CFX, we have modelled a stationary water-spray system with an array of three nozzles in line, with two angles of impingement: θ = 90° and θ = 75°. Several numerical tests have been carried out, varying the interaxial distance of nozzles, standoff distance, jet pressure and jet impingement angle in order to identify effective and efficient cleaning procedures to restore collectors' reflectance, decrease turbulence and improve CST plant efficiency. Results show that the forces generated over the flat target surface are proportional to the inlet pressure and to the water velocity over the surface, and that the shear stresses decrease as the standoff distance increases.

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Experimental Investigation of Particle Removal from Surfaces by Pulsed Air Jets

Cited by 39 publications

References 21 publications

Monolayer and Multilayer Particle Deposits on Hard Surfaces: Literature Review and Implications for Particle Resuspension in the Indoor Environment

Monolayer and Multilayer Particle Deposits on Hard Surfaces: Literature Review and Implications for Particle Resuspension in the Indoor Environment

Experimental investigation of jet-induced resuspension of indoor deposited particles

A numerical study on high-pressure water-spray cleaning for CSP reflectors

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