Entrainment of fine particles from surfaces by impinging shock waves

Smedley, G. T.; Phares, Denis J.; Flagan, Richard C.

doi:10.1007/s003480050270

Cited by 28 publications

(11 citation statements)

References 32 publications

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“…Loureiro and Freire (2009) used two different ways to quantify the wall shear stress using a Micro-sensor (an optical MEMS-based velocity gradient sensor) from Measurement Science Enterprise Inc. (Fourguette et al 2001;Gharib et al 2002) and the slope of the velocity distribution in the logarithmic sublayer (Clauser 1956). Smedley et al (1999) described an experimental study of the removal of fine (8.3 lm) polystyrene particles from a glass substrate using a gas impinging jet. Results suggest that the particles act as nearly quantized shear stress sensors that provide a direct, though as yet uncalibrated, measure of the surface shear stress.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the wall shear stress and the vortex dynamics in a circular impinging jet

et al. 2012

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The wall shear stress and the vortex dynamics in a circular impinging jet are investigated experimentally for Re = 1,260 and 2,450. The wall shear stress is obtained at different radial locations from the stagnation point using the polarographic method. The velocity field is given from the time resolved particle image velocimetry (TR-PIV) technique in both the free jet region and near the wall in the impinging region. The distribution of the momentum thickness is also inspected from the jet exit toward the impinged wall. It is found that the wall shear stress is correlated with the large-scale vortex passing. Both the primary vortices and the secondary structures strongly affect the variation of the wall shear stress. The maximum mean wall shear stress is obtained just upstream from the secondary vortex generation where the primary structures impinge the wall. Spectral analysis and cross-correlations between the wall shear stress fluctuations show that the vortex passing influences the wall shear stress at different locations simultaneously. Analysis of cross-correlations between temporal fluctuations of the wall shear stress and the transverse vorticity brings out the role of different vortical structures on the wall shear stress distribution for the two Reynolds numbers.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of the wall shear stress and the vortex dynamics in a circular impinging jet

et al. 2012

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“…The case where each jet interacts with previous jets must represent the vibrating air jet. Another method studied by Smedley et al [15] is the removal of particles by impinging shock waves. The shock waves are generated in an open-ended shock tube, thus producing ultrasonic velocity pulses with large time intervals.…”

Section: Other Removal Methodsmentioning

confidence: 99%

Cleaning Using a High-speed Impinging Jet

Gotoh¹

2008

Developments in Surface Contamination and Cleaning

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“…The pulse jet devices for such purposes are now in commercial production or have recently been used for a variety of industrial fields. For example, in the semi-conductor industries or coal-based power plants, removal of fine particles from surfaces is practical important both for surface cleaning and for contamination detection [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of duct geometry on shock wave discharge

et al. 2006

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This paper describes computational work to understand the unsteady flow-field of a shock wave discharging from an exit of a duct and impinging upon a flat plate. A flat plate is located downstream, and normal to the axis of the duct. The distance between the exit of the duct and flat plate is changed. In the present study, two different duct geometries (i.e., square and cross section) are simulated to investigate the effect of duct geometry on the un-steady flows of a shock wave. In computation, the total variation diminishing (TVD) scheme is employed to solve three-dimensional, unsteady, compressible, Euler equations. Computations are performed over the range of shock Mach number from 1.05 to 1.75. Computational results can predict the three-dimensional dynamic behaviour of the shock wave impinging upon the flat plate. The results obtained show that the pressure increase generated on the plate by the shock impingement depends on the duct geometry and the distance between the duct exit and plate, as well as the shock Mach number. It is also found that for the duct with cross-section, the unsteady loads acting on the flat plate are less, compared with the square duct.

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Entrainment of fine particles from surfaces by impinging shock waves

Cited by 28 publications

References 32 publications

Experimental investigation of the wall shear stress and the vortex dynamics in a circular impinging jet

Experimental investigation of the wall shear stress and the vortex dynamics in a circular impinging jet

Cleaning Using a High-speed Impinging Jet

Effect of duct geometry on shock wave discharge

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