Settling and spreading behaviour of particle clusters in quiescent liquids in confined vessels--颗粒学报PARTICUOLOGY

Pal, S., & Kulkarni, A. A. (2023). Settling and spreading behaviour of particle clusters in quiescent liquids in confined vessels. Particuology, 83, 91-100. https://doi.org/10.1016/j.partic.2023.01.019

Settling and spreading behaviour of particle clusters in quiescent liquids in confined vessels

Sayan Pal ^{a b c *}, Amol A. Kulkarni ^{a b *}

a Chemical Engineering & Process Development Division, CSIR-National Chemical Laboratory, Pune, 411008, India
b Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
c University College London, Torrington Place, London, WC1E 7JE, UK

10.1016/j.partic.2023.01.019

Volume 83, December 2023, Pages 91-100

Received 23 August 2022, Revised 17 January 2023, Accepted 31 January 2023, Available online 17 February 2023, Version of Record 14 March 2023.

E-mail: sayan.pal@ucl.ac.uk; pal.sayan3@gmail.com; aa.kulkarni@ncl.res.in

Highlights

• Particle cluster settles at high Reynolds number in quiescent liquid in a vessel.

• Particles spread in a near-circular annular shape at the vessel bottom surface.

• The near-circular shape doesn't depend on vessel cross-section shape or particle properties.

• Hemispherical bottom cap of the cluster was responsible for circular annular shape.

• For high viscosity liquid, cluster breakage was responsible for asymmetric shapes.

Abstract

Here we report experiments on particle cluster settling at high Reynolds number in quiescent liquid contained in a vessel. The particles were observed to spread at the vessel bottom surface in a near-circular annular shape after settling irrespective of the shape of the vessel cross-section and particle shape, size, and types. Effect of different parameters such as mass, type and aspect ratio of the particles, height, and viscosity of liquid was investigated on spreading behaviour. Formation of the hemispherical bottom cap of the cluster that bounces upon hitting the vessel bottom surface was found to be responsible for the final circular annular shape of the settled structure. Particle leakage from the cluster was seen in the form of a tail. In the liquid having viscosity beyond 100 cP, cluster breakage was observed that resulted in hindered settling and asymmetric shapes of finally settled particles. The observations are useful to understand the overall area over which settling and spreading of such clusters can be observed.

Graphical abstract

Keywords

Particle cluster; Temporal evolution; Settling; Spreading

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