Premium
Start‐up Behavior of Viscoelastic Fluid Flow Near a Capillary Entry
Author(s) -
SHIRAKASHI MASATAKA,
TAKAHASHI TSUTOMU,
WATANABE ATSUSHI,
ARUGA YOHSUKE
Publication year - 2002
Publication title -
annals of the new york academy of sciences
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.712
H-Index - 248
eISSN - 1749-6632
pISSN - 0077-8923
DOI - 10.1111/j.1749-6632.2002.tb04556.x
Subject(s) - capillary action , viscoelasticity , flow (mathematics) , mechanics , chemistry , physics , thermodynamics
A bstract : The effect of elasticity on the capillary entry flow development process was investigated by applying a laser doppler velocimeter (LDV) and flow visualization. The fluid filling the test section was kept at rest under a pressure of compressed air or a natural head and then a valve below the capillary was quickly opened to start the flow. Although the development of the capillary entry flow field of a Newtonian fluid is virtually quasi‐steady, it takes a considerable time for a viscoelastic PAA‐solution to attain its terminal regime. The transient behavior of the flow rate of the PAA‐solution is attributed to the gradual development process of the flow field upstream from the entry.