期刊
EXPERIMENTAL THERMAL AND FLUID SCIENCE
卷 39, 期 -, 页码 167-175出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.expthermflusci.2012.01.021
关键词
Shear rate; Cylinder; Electro-diffusional flow diagnostics; Shear-thinning fluids; Micro-electrodes
Micro-electrodes made of platinum have been used to measure the local shear rate on the surface of a cylinder (length-to-diameter ratio of 11-12) exposed to the fully developed laminar flow of power-law fluids in a vertical pipe. Two Newtonian and two shear-thinning solutions are used as model test fluids to ascertain the influence of shear-thinning viscosity on the distribution of shear rare on the surface of the cylinder. The results reported herein encompass a wide range of Reynolds numbers 0.16 <= Re <= 75 based on the cylinder diameter and centreline velocity. Over the range of conditions, it is observed that the shear rate is a maximum at about theta = 130 degrees and it tends to be higher in shear-thinning fluids than that in Newtonian fluids otherwise under identical conditions. (C) 2012 Elsevier Inc. All rights reserved.
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