Sliding droplets of Xanthan solutions: a joint experimental and numerical study

Autor:	Varagnolo, Silvia, Mistura, Giampaolo, Pierno, Matteo, Sbragaglia, Mauro
Rok vydání:	2015
Předmět:	Condensed Matter - Soft Condensed Matter Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter - Materials Science
Druh dokumentu:	Working Paper
Popis:	We have investigated the sliding of droplets made of solutions of Xanthan, a stiff rodlike polysaccharide exhibiting a non-newtonian behavior, notably characterized by a shear-rate dependence of the viscosity. These experimental results are quantitatively compared with those of newtonian fluids (water). The impact of the non-newtonian behavior on the sliding process was shown through the relation between the average dimensionless velocity (i.e. the Capillary number) and the dimensionless volume forces (i.e. the Bond number). To this aim, it is needed to define operative strategies to compute the Capillary number for the shear thinning fluids and compare with the corresponding newtonian case. Results from experiments were complemented with lattice Boltzmann numerical simulations of sliding droplets, aimed to disentangle the influence that non-newtonian flow properties have on the sliding. Comment: Submitted to: The European Physics Journal E - Special Issue "Multi-scale phenomena in complex flows and flowing matter". 8 pages, 7 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1509.07882 Zobrazit plný text záznamu View this record from Arxiv