Influence of Particle Size, Applied Compression, and Substratum Material on Particle−Surface Adhesion Force Using the Centrifuge Technique

Abstract

The centrifuge technique was used to investigate the influence of particle size, applied compression, and substrate material (stainless steel, glass, Teflon, and poly(vinyl chloride)) on particle-surface adhesion force. For this purpose, phosphatic rock (F p ) 3090 kg/m 3 ) and manioc starch particles (F p ) 1480 kg/m 3 ) were used as test particles. A microcentrifuge that reached a maximum rotation speed of 14 000 rpm and which contained specially designed centrifuge tubes was used in the adhesion force measurements. The curves showed that the adhesion force profile followed a normal log distribution. The adhesion force increased linearly with particle size and with the increase of each increment of compression force. The manioc starch particles presented greater adhesion forces than the phosphatic rock particles for all particle sizes studied. The glass substrate showed a higher adherence than the other materials, probably due to its smoother topographic surface roughness in relation to the other substrata.

Statistical Analysis of Fine Particle Resuspension from Rough Surfaces by Turbulent Flows

“…The Weibull and log-normal distributions were further validated in the study by Li et al (2006) which measured the adhesion forces between alumina particles and silica substrates with different coatings. Lognormal distributions were also found in a number of other experimental studies (Lam and Newton, 1992;Louey et al, 2001;Salazar-Banda et al, 2007;Felicetti et al, 2008) involving surfaces with significant roughness. Perni (2010, 2011) numerically and experimentally showed that the adhesion forces between PBT particles and glass and silicone surfaces follow a Gaussian distribution.…”

“…The Kolmogorov-Smirnov (KS) test is conducted to rank the goodness-of-fit of the three distributions and the rankings are shown in Table 2. The modelled adhesion force distributions have the parameters in the range of experimentally measured ones by the existing studies (e.g., Lam and Newton (1992), Louey et al (2001), SalazarBanda et al (2007), and Felicetti et al (2008)). It is shown in Table 2 that the theoretical data of adhesion forces is best represented by log-normal distributions as indicated by the KS statistics, which measure the maximum vertical differences between the cumulative distribution functions of the theoretical models and the actual data.…”

Surface interactions of aerosols and their impact on infectious disease transmission

“…Then, the drum rotor was capped and the centrifuge was switched on to the designated rotational speed for 2 minutes. The duration of 2 minutes is used because the study of Felicetti et al [67] suggested that a longer duration had no effect on the observed adhesion force from the centrifuge experiments.…”

“…Apart from the inherent limitations as discussed above, the application of the mean adhesion force models is also limited due to the fact that the actual adhesion force between particles and a surface generally follows a distribution rather than a single value [50,[67][68][69][70][71][72][73][74][75][76][77]. Therefore, solely understanding the mean adhesion force is not enough for accurate depiction of the actual particle-surface adhesion relevant phenomena (e.g., particle resuspension).…”

“…Towards understanding adhesion force distribution, despite significant experimental effort has been taken [50,[67][68][69][70][71][72][73][74][75][76][77], few models have been proposed for the time being.…”