Measurement of the average shear rate around a microparticle in the shear thinning medium with laser tweezers. (4th July 2018)

• Record Type: Journal Article
• Authors: Domagalski, Piotr; Dziubinski, Marek; Pawlak, Ryszard; Tomczyk, Mariusz
• Is Part Of: Particulate science and technology. Volume 36:Number 5(2018)
• Page Start: 529
• Page End: 533
• Publication Date: 2018-07-04
• Subjects: Measurement -- optical tweezers -- properties -- rheology -- sedimentation; Particles -- Periodicals; 620.43
• DOI: 10.1080/02726351.2016.1267288
• Languages: English
• ISSNs: 0272-6351

Abstract

ABSTRACT: A novel method for the determination of the average shear rate around a microparticle moving in the fluid is presented. Although the shear rate around a particle moving in the fluid is a parameter of paramount importance in sedimentation studies, its determination is time-consuming, thus model-based solutions are preferred. However, the current literature models require still rigorous validation. The presented technique relies on optical tracking of a laser-tweezers trapped particle suspended in the liquid medium. The obtained experimental results for spherical particles of 1 micron diameter show a good agreement with the classical rheology and literature correlation models. The new method is a valuable tool for determination of sedimentation parameters as it reduces the time of experiments and the sample volume by order(s) of magnitude when compared to classical methods.