論文

査読有り
2018年

Experimental comparison of static rheological properties of non-newtonian food fluids with dynamic viscoelasticity

Nihon Reoroji Gakkaishi
  • Kanichi Suzuki
  • ,
  • Yoshio Hagura

46
1
開始ページ
1
終了ページ
12
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1678/rheology.46.1
出版者・発行元
Society of Rheology

Correlations between static rheological properties (G: shear modulus, μ: viscosity, μapp: apparent viscosity) of four food fluids (thickening agent solution, yoghurt, tomato puree and mayonnaise) measured employing a newly developed non-rotational concentric cylinder (NRCC) method and dynamic viscoelastic properties (|G*|: complex shear modulus, G': storage shear modulus, G": loss shear modulus, |η*|: complex viscosity, tand: loss tangent, μapph: apparent viscosity) measured by a conventional apparatus (HAAKE MARS III) were studied. μapp and μapph for each sample fluid agreed well. μapp≒|η*| obeying the Cox-Merz rule was obtained for the thickening agent solution, μapp &lt
|η*| for mayonnaise and μapp ≪ |η*| for tomato puree and yoghurt. μ was lower than μapp or μapph for all samples, and reached μapp with an increasing shear rate. Plotting G and |G*| against the shear rate and angular velocity respectively in the same figure revealed G &lt
|G*| for tomato puree, G≒|G*| for yoghurt and G &gt
|G*| for mayonnaise and thickening agent solution. The applicability of two-element models in analyzing the viscoelastic behavior of sample fluids was investigated by comparing two characteristic times τM = 1/(ωtanδ) and τK = tanδ/ω, corresponding to Maxwell and Kelvin-Voigt models respectively and evaluated from measurements of tanδ, with τ = μ/G and τapp = μapp /Gapp calculated from rheological properties measured by the NRCC method. Here Gapp (= G(μ/μapp) is an apparent shear modulus newly defined to evaluate the shear-rate dependency of the elasticity of Non-Newtonian fluids. Results show τK agreed well with τapp, suggesting the possibility of applying the Kelvin-Voigt model to the viscoelastic behavior of sample fluids.

リンク情報
DOI
https://doi.org/10.1678/rheology.46.1
ID情報
  • DOI : 10.1678/rheology.46.1
  • ISSN : 0387-1533
  • SCOPUS ID : 85045831903

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