Research Papers

Thermorheological Characterization of Elastoviscoplastic Carbopol Ultrez 20 Gel

[+] Author and Article Information
M. A. Hassan, Mohd. Kaleem Khan

Department of Mechanical Engineering,
Indian Institute of Technology Patna,
Patna, Bihar 800013, India

Manabendra Pathak

Department of Mechanical Engineering,
Indian Institute of Technology Patna,
Patna, Bihar 800013, India
e-mail: mpathak@iitp.ac.in

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received June 8, 2014; final manuscript received February 21, 2015; published online March 25, 2015. Assoc. Editor: Marwan K. Khraisheh.

J. Eng. Mater. Technol 137(3), 031002 (Jul 01, 2015) (8 pages) Paper No: MATS-14-1129; doi: 10.1115/1.4030004 History: Received June 08, 2014; Revised February 21, 2015; Online March 25, 2015

The temperature and concentration play an important role on rheological parameters of the gel. In this work, an experimental investigation of thermorheological properties of aqueous gel Carbopol Ultrez 20 for various concentrations and temperatures has been presented. Both controlled stress ramps and controlled stress oscillatory sweeps were performed for obtaining the rheological data to find out the effect of temperature and concentration. The hysteresis or thixotropic seemed to have negligible effect. Yield stress, consistency factor, and power law index were found to vary with temperature as well as concentration. With gel concentration, the elastic effect was found to increase whereas viscous dissipation effect was found to decrease. Further, the change in elastic properties was insignificant with temperature in higher frequency range of oscillatory stress sweeps.

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Fig. 1

Concentration dependence of yield stress reported by different researchers

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Fig. 2

Carbopol gel visuals after t = 40 s of pouring. Concentrations: (a) 0.8 g/l, (b) 1.0 g/l, and (c) 2.0 g/l.

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Fig. 3

Hysteresis effect on viscosity variation with shear rate

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Fig. 4

Flow curve for various operating temperature for 1.0 g/l concentration

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Fig. 5

Viscosity variation with (a) temperature and (b) shear rate

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Fig. 6

Temperature dependence of (a) the yield stress, (b) consistency factor, and (c) power law index

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Fig. 7

Flow curves for different gel concentrations

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Fig. 8

Effect of gel concentration on (a) yield stress, (b) consistency factor, and (c) power law index

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Fig. 9

Variation of storage and loss moduli with strain for different gel concentrations: (a) 0.4 g/l, (b) 0.8 g/l, (c) 1.0 g/l, and (d) 2.0 g/l

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Fig. 10

Variation of storage and loss moduli with concentration at 1% strain

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Fig. 11

Variation of storage and loss moduli with frequency for different temperatures

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Fig. 12

Variation of Arrhenius parameters with gel concentration




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