Open AccessWall effects on the terminal velocity of spherical particles in Newtonian and non-Newtonian fluids
Author(s) -
Carlos Henrique Ataíde,
Fernando Lourenço Pereira,
M. A. S. Barrozo
Publication year - 1999
Publication title -
brazilian journal of chemical engineering/brazilian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.313
H-Index - 52
eISSN - 1678-4383
pISSN - 0104-6632
DOI - 10.1590/s0104-66321999000400007
Subject(s) - newtonian fluid , settling , non newtonian fluid , mechanics , spheres , reynolds number , physics , particle (ecology) , compressibility , classical mechanics , thermodynamics , materials science , geology , turbulence , oceanography , astronomy
The objective of this work is to study the effect of confining walls on the free settling of spherical particles along the axes of five vertical cylindrical tubes in Newtonian and non-Newtonian liquids. Experimental results were predominantly obtained in the particle flow region between the Stokes and the Newton regimes (intermediate region) and displayed Reynolds numbers in the ranges 0.7b<0.55. These results allowed to analyze the procedure for estimating vt¥ as a function of b based on vt data and present correlations for estimating the wall effects on the fall of spheres in Newtonian liquids as well as for the characteristic shear rate of spheres in non-Newtonian fluids