6506-4 - WHAT IS VISCOSITY Observation A high-viscosity...

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1 WHAT IS VISCOSITY ? Observation : A high-viscosity material flows at a slower rate under the same stress. Viscosity is the resistance of a material to flow under stress. Y τ V Material Shear Rate = V/Y =d γ /dt Shear Stress = τ Viscosity, η = τ / (d γ /dt) Shear Stress vs. Shear Rate Relationship (for Newtonian Fluid) τ = η 1.0 (d γ /dt) C
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2 Log Shear Stress vs Log Shear Rate (for a Newtonian Fluid) Pseudoplastic Flow Characteristics
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3 Log Shear Stress vs. Log Shear Rate (for a Pseudoplastic Fluid) Bingham Plastic Flow Characteristics
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4 Dilatant Flow Characteristics Log τ vs. Log d γ /dt for a Dilatant Fluid
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5 Flow Characteristics of a Thixotropic Fluid • The viscosity of the fluid appears to increase with time, from long time of storage or inactivity. (e.g. A can of asphalt has been in storage for a long time with no or little exposure to air or heat) • The original viscosity can be restored by application of strain energy or heat.
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6506-4 - WHAT IS VISCOSITY Observation A high-viscosity...

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