Further measurements of the bouncing of small latex spheres

Dahneke, Barton

doi:10.1016/0021-9797(75)90083-1

Cited by 135 publications

(71 citation statements)

References 6 publications

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“…The interested reader is referred to the works of Dahneke (1971Dahneke ( , 1975Dahneke ( , 1995 and Tsai et al (1990) for fundamental reviews of interfacial physical phenomena that govern particle rebound. In summary, conservation of energy arguments are employed to facilitate calculations of coefficients of restitution (ratio of final to initial particle velocity) considering material properties, plastic and elastic deformation, surface adhesion, surface roughness, and the flexural work done if the surface is a thin flexible body (e.g., fiber).…”

Section: Introductionmentioning

confidence: 99%

High-Volume Aerosol Filtration and Mitigation of Inertial Particle Rebound

Hubbard

Salazar

Crown

et al. 2014

Aerosol Science and Technology

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The performance of electrostatically charged blown microfiber filter media was characterized for high-volume sampling applications. Pressure drop and aerosol collection efficiency were measured at air pressures of 55.2 and 88.7 kilopascals (kPa) and filter face velocities ranging from 2.5 to 11.25 meters per second (m/s). Particle penetration was significant for particles above 0.5 micrometers (μm) in aerodynamic diameter where the onset of particle rebound was observed as low as 200 nanometers (nm). Particle retention was enhanced by treating filters in an aqueous solution of glycerol. Adding this retention agent eliminated electrostatic capture mechanisms but mitigated inertial rebound. Untreated filters had higher nanoparticle collection efficiencies at lower filter face velocities where electrostatic capture was still significant. At higher filter face velocities, nanoparticle collection efficiencies were higher for treated filters where inertial capture was dominant and particle rebound was mitigated. Significant improvements to microparticle collection efficiency were observed for treated filters at all air flow conditions. At high air pressure, filter efficiency was greater than 95% for particles less than 5 μm. At low air pressure, performance enhancements were not as significant since air velocities were significantly higher through the fiber mat. Measured single fiber efficiencies were normalized by the theoretical single fiber efficiency to calculate adhesion probability. The small fiber diameter (1.77 μm) of this particular filter gave large Stokes numbers and interception parameters forcing the single fiber efficiency to its maximum theoretical value. The adhesion probability was plotted as a function of the ratio of Stokes and interception parameter similar to the works of others. Single fiber efficiencies for inertial nanoparticle collection were compared to existing theories and correlations.Received 30 September 2013; accepted 9 February 2014. Sandia National Laboratories is a multiprogram laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.Address correspondence to Josh Hubbard, Sandia National Laboartaories, P.O. Box 5800 MS 1148, Albuquerque, NM 87185-1148, USA. E-mail: jahubba@sandia.gov INTRODUCTIONA large number of works have examined the performance of fibrous filtration media at filter face velocities greater than 1.0 meter per second (m/s). In a previous work, we have shown that nanoparticle collection efficiencies via impaction and interception deviate from the predictions of Stechkina et al. (1969) for viscous flow when filter face velocities are significantly higher than 0.01-0.1 m/s (Hubbard et al. 2012). Increased penetration has been observed and attributed to inertial particle rebound from the fiber surface. The objectives of this study were to (1) characterize the performance of eBMF (electrostatically charged ...

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Section: Introductionmentioning

confidence: 99%

High-Volume Aerosol Filtration and Mitigation of Inertial Particle Rebound

Hubbard

Salazar

Crown

et al. 2014

Aerosol Science and Technology

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“…To better understand these problems, the impact between a fine particle and a flat surface has been extensively studied. The pioneering work of direct measurement of particle velocity during the impact with a flat surface was conducted by Dahneke [18][19][20]. However, the accurate measurement of final bouncing velocity near the capture threshold (i.e., the critical velocity), where the adhesion effect plays a predominant role, was not achieved in that work.…”

Section: Introductionmentioning

confidence: 99%

“…Equations (16), (18) and (19) show that the elastic deformation occuring, the adhesion force and the thermophoretic force play an important role in v c < v i,n ≤ v y . The particle's incoming kinetic energy exceeds the work done by the adhesion and thermophoretic force, and the particle rebounds The v t in Equation (16) is partially differentiated to obtain Equation (20):…”

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confidence: 99%

An Experimental Investigation on the Influence of Temperature on the Normal Impact of Fine Particles with a Plane Surface

et al. 2014

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This study investigated the rebound behavior of SiO 2 particles normally impacting a planar surface under different temperature conditions. The system has been characterized for an aerosol inlet temperature range of 20-190 °C, flow velocities of 0-20 ms , and an impaction surface temperature range of 20-140 °C. For the first time, while keeping the same temperature gradient from the high-to low-temperature regions, the influences of varying temperature on the rebound behavior of SiO 2 particles normally impacting a plane surface were examined. At increased temperatures, the plastic deformation increases and the coefficient of restitution reduces. The critical velocity is between 0.542 and 0.546 m/s under condition 1 (the carrier gas temperature (T g ) and the impaction surface temperature (T W ) remain at room temperature of 20 °C), which increases to between 0.829 and 0.847 m/s under condition 4 (T g and T W remain at temperatures of 190 °C and 140 °C, respectively). The experimental results show that the critical velocity increases with increasing temperature.

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“…Gillespie and Rideal (1955) examined the impact and bounce of liquid (dioctylphthallate-DOP) particles on glass slides and attempted to quantify bounce by examining the traces left on the impact slide and droplets which fell onto another slide. Other experiments have been conducted using more advanced techniques such as laser Doppler velocimetry to measure the bounce of polystyrene latex (PSL) particles on polished quartz and stainless steel surfaces (Dahneke 1973(Dahneke , 1975Li et al 1999). Techniques involving impaction of aerosols on flat plates to compare bounce properties have also been developed (Wang and Walter 1987;Xu and Willeke 1993).…”

Section: Introductionmentioning

confidence: 99%

Particle Bounce During Filtration of Particles on Wet and Dry Filters

Mullins

Agranovski

Braddock

2003

Aerosol Science and Technology

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This paper experimentally examines the bounce and immediate re-entrainment of liquid and solid monodisperse aerosols under a stable filtration regime (precake formation) by wet and dry fibrous filters. PSL and DEHS were the solid and liquid aerosols, respectively, used in four monodisperse sizes of 0.52, 0.83, 1.50, and 3.00 µm. Three different fibrous filters were used to filter the aerosol streams, and the efficiency of the filtration process for each aerosol type under dry and wet regimes was measured. It was found that the solid particles generally exhibited a lower fractional filtration efficiency than liquid particles, although this difference decreased in the smaller size fractions. The difference between solid and liquid efficiencies was found to be greatest in the 1.5 µm size range. As particle sizes of liquid/solid aerosols and filtration parameters were similar, this difference is most likely to be due to the effect of particle bounce and or immediate re-entrainment occurring inside the filter, with the greater efficiency of filtration of the liquid particles being due to their greater capacity to plastically/elastically deform in order to absorb the impact forces. However, for the wet filtration regime (each fibre of the filter was coated by a film of water), no significant difference in filtration efficiency was detectable between solid and liquid aerosols. Therefore, the conclusion can be drawn that the either the bounce effect of the particles is inhibited by the liquid film, or the filtration conditions in the wet filter are so different that the aerosol properties are less significant with respect to capture.

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Further measurements of the bouncing of small latex spheres

Cited by 135 publications

References 6 publications

High-Volume Aerosol Filtration and Mitigation of Inertial Particle Rebound

High-Volume Aerosol Filtration and Mitigation of Inertial Particle Rebound

An Experimental Investigation on the Influence of Temperature on the Normal Impact of Fine Particles with a Plane Surface

Particle Bounce During Filtration of Particles on Wet and Dry Filters

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