NDLI: Flow of soft solids squeezed between planar and spherical surfaces

Content Provider	Springer Nature Link
Author	Meeten, Gerald Henry
Copyright Year	2005
Abstract	The force to squeeze a Herschel–Bulkley material without slip between two approaching surfaces of various curvature is calculated. The Herschel–Bulkley yield stress requires an infinite force to make plane–plane and plane–concave surfaces touch. However, for plane–convex surfaces this force is finite, which suggests experiments to access the mesoscopic thickness region (1–100 μm) of non-Newtonian materials using squeeze flow between a plate and a convex lens. Compared to the plane–parallel surfaces that are used most often for squeeze flow, the dependence of the separation h′ and approach speed V on the squeezing-time is more complicated. However, when the surfaces become close, a simplification occurs and the near-contact approach speed is found to vary as V ∝ h′0 if the Herschel–Bulkley index is n<1/3, and V ∝ h′(3n-1)/(2n) if n≥ 1/3. Using both plane–plane and plane–convex surfaces, concordant measurements are made of the Herschel–Bulkley index n and yield stress τ0 for two soft solids. Good agreement is also found between τ0 measured by the vane and by each squeeze-flow method. However, one of the materials shows a limiting separation and a V(h′) behaviour not predicted by theory for h′<10 μm, possibly owing to an interparticle structure of similar lengthscale.
Starting Page	563
Ending Page	572
Page Count	10
File Format	PDF
ISSN	00354511
Journal	Rheologica Acta
Volume Number	44
Issue Number	6
e-ISSN	14351528
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-06-02
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Rheometry Squeeze flow Slip Stick Yield stress Viscosity Herschel–Bulkley Structured fluids Non-Newtonian materials Soft solids Vane Characterization and Evaluation of Materials Polymer Sciences Soft and Granular Matter, Complex Fluids and Microfluidics Mechanical Engineering Food Science
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Condensed Matter Physics Materials Science

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