Flow analyses of highly concentrated xhantan gum fluid

Abstract

The concentration effect of Xanthan gum (XG) solutions (1.0, 1.5, 2.0, 2.5% w/v) on the rheological flow parameters are examined using stress controlled rheometer and gravity driven flow set-up measurement at 25°C. Concentrated XG solutions has yielding behavior obtained by fitting results through Herschel-Bulkley (HB) model with highest regression coefficient R2 = 0.995 and R2 = 0.993 respectively by rheometer and set-up measurement. The results agreed well each other from these measurements. Increasing the concentration of XG solutions promote dynamic and static yield stresses due to increase of entanglement structure density of XG solutions. Also, the magnitudes of consistency index, K, have increasing trend with XG concentration as a result of increasing entanglement density of XG structure. Static yield stress values are much closely dynamic stress values getting from under gravity dynamic flow indicating that supplies undisturbed moleculer structure of XG due to nature of creeping flow.