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Mullins BJ, Braddock RD, Agranovski IE, et al. Observation and modelling of clamshell droplets on vertical fibres subjected to gravitational and drag forces. J Colloid Interface Sci. 2005;284(1):245-54doi: 10.1016/j.jcis.2004.10.013.
Mullins, B. J., Braddock, R. D., Agranovski, I. E., Cropp, R. A., & O'Leary, R. A. (2005). Observation and modelling of clamshell droplets on vertical fibres subjected to gravitational and drag forces. Journal of colloid and interface science, 284(1), 245-54. https://doi.org/10.1016/j.jcis.2004.10.013
Mullins, Benjamin J, et al. "Observation and modelling of clamshell droplets on vertical fibres subjected to gravitational and drag forces." Journal of colloid and interface science vol. 284,1 (2005): 245-54. doi: https://doi.org/10.1016/j.jcis.2004.10.013
Mullins BJ, Braddock RD, Agranovski IE, Cropp RA, O'Leary RA. Observation and modelling of clamshell droplets on vertical fibres subjected to gravitational and drag forces. J Colloid Interface Sci. 2005 Apr 01;284(1):245-54. doi: 10.1016/j.jcis.2004.10.013. PMID: 15752809.
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J Colloid Interface Sci. 2005 Apr 01;284(1):245-54. doi: 10.1016/j.jcis.2004.10.013.

Observation and modelling of clamshell droplets on vertical fibres subjected to gravitational and drag forces.

Journal of colloid and interface science

Benjamin J Mullins, Roger D Braddock, Igor E Agranovski, Roger A Cropp, Rebecca A O'Leary

Affiliations

  1. School of Environmental Engineering, Faculty of Environmental Sciences, Griffith University, Nathan QLD 4111, Australia. [email protected]

PMID: 15752809 DOI: 10.1016/j.jcis.2004.10.013

Abstract

Extensive experimental investigation of the wetting processes of fibre-liquid systems during air filtration (when drag and gravitational forces are acting) has shown many important features, including droplet extension, oscillatory motion, and detachment of drops from fibres as airflow velocity increases, and also movement or flow of droplets along fibres. A detailed experimental study of the processes was conducted using stainless steel filter fibres and H2O aerosol, which coalesce on the fibre to form clamshell droplets. The droplets were predominantly observed in the Reynolds transition flow region, since this is the region where most of the above features occur. The droplet oscillation is believed to be induced by the onset of the transition from laminar to turbulent flow as the increasing droplet size increases Reynolds number for the flow around the droplet. Two-dimensional flow in this region is usually modelled using the classical Karman vortex street, however there exist no 3D equivalents. Therefore to model such oscillation it was necessary to create a new conceptual model to account for the forces both inducing and preventing such oscillation. The agreement between the model and experimental results is very good for both the radial and transverse oscillations.

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