Dynamic Viscoelastic Properties of Foods in Texture Control
作者:
K. L. Bistany,
J. L. Kokini,
期刊:
Journal of Rheology
(AIP Available online 1983)
卷期:
Volume 27,
issue 6
页码: 605-620
ISSN:0148-6055
年代: 1983
DOI:10.1122/1.549732
出版商: The Society of Rheology
数据来源: AIP
摘要:
Small‐amplitude dynamic viscoelastic properties of ten fluid and semisolid food products such as butter, canned frosting, ketchup, and whipped cream cheese have been compared with their respective properties in steady shear. The complex viscosity (η*) and dynamic viscosity (η′) were always found to be larger than steady viscosities (η), resulting in relationships of the form:η*(ω)=C⋅η(γ̇)α,η′(ω)=C′⋅η(γ̇)α′whereCandC′are constants(Pa1−α s1−α, Pa1−α′ s1−α′),α and α′ are constants (dimensionless), ω is the frequency(s−1),and γ̇ is the shear rate(s−1).The primary normal stress coefficient(ψ1)was found to correlate well withG′/ω2which is larger thanψ1in all cases, andG′/ω2can be related to the primary normal stress coefficient by a power relationship of the form:G′/ω2=C*⋅ψ1(γ̇)α*,whereC*is a constant(Pa1−α* s2(1−α*))and α*is a constant (dimensionless). This makes it possible to relate dynamic viscoelastic properties to steady properties for the fluid and semisolid foods studied.
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