Extensional behavior of hydroxypropyl guar solutions: Optical rheometry in opposed jets and flow through porous media

J. P. Tatham, S. Carrington, J. A. Odell, A. C. Gamboa, A. J. MÜller, Avelino E Saez

Research output: Contribution to journalArticle

24 Citations (Scopus)

Abstract

In this work we perform an experimental characterization of the rheology of hydroxypropyl guar (HPG) solutions. The flow situations investigated are shear rheometry, elongational flow in opposed jets, and flow through porousm edia.T he resultso f the experimentss how that hydroxypropyl guar behaves as a semiflexible molecule in aqueous solutions under elongational flow situations. In shear flows and under semidilute conditions, the HPG solutions have a shear-thinning behavior, whereas in opposed-jets flow they exhibit extension thickening. In porous media flows, semidilute solutions behave as shear thinning, but there is evidence that extension thickening is present. We have developed a technique in which a linear charged-coupled device (CCD) array is used as a retardation detector to measure birefringence profiles in opposed-jets flow. This technique has shown that HPG molecules are stretched in the flow field, which confirms that the HPG molecules are semiflexible. The addition of a cross-linking agent to HPG solutions was found to have a pronounced effect on their flow behavior in extensional flows. Filtered dilute solutions exhibit intramolecular cross links that reduce the apparent viscosity of the solution in both opposed jets and porous media flows. On the other hand, semidilute solutions (as well as filtered solutions of low concentrations) exhibit intermolecular cross links that, in porous media flows, result in a sizable increase in pressure drops.

Original languageEnglish (US)
Pages (from-to)961-986
Number of pages26
JournalJournal of Rheology
Volume39
Issue number5
DOIs
StatePublished - Sep 1995
Externally publishedYes

Fingerprint

Porous materials
shear thinning
Shear thinning
jet flow
Molecules
hydroxypropyl guar
molecules
Shear flow
Birefringence
pressure drop
Rheology
rheology
shear flow
Pressure drop
birefringence
low concentrations
Flow fields
flow distribution
Viscosity
viscosity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Materials Science(all)

Cite this

Extensional behavior of hydroxypropyl guar solutions : Optical rheometry in opposed jets and flow through porous media. / Tatham, J. P.; Carrington, S.; Odell, J. A.; Gamboa, A. C.; MÜller, A. J.; Saez, Avelino E.

In: Journal of Rheology, Vol. 39, No. 5, 09.1995, p. 961-986.

Research output: Contribution to journalArticle

Tatham, J. P. ; Carrington, S. ; Odell, J. A. ; Gamboa, A. C. ; MÜller, A. J. ; Saez, Avelino E. / Extensional behavior of hydroxypropyl guar solutions : Optical rheometry in opposed jets and flow through porous media. In: Journal of Rheology. 1995 ; Vol. 39, No. 5. pp. 961-986.
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