Viscosity Behavior
Viscosity Behavior - Related Videos
08:04
Viscosity of Propylene Glycol Solutions
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2023
Source: Michael G. Benton and Kerry M. Dooley, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Viscosity is a measure of a fluid's resistance to flow, and it is a useful parameter in the design of efficient product processing and quality control in a wide range of industries. A variety of viscometers are used to obtain the most accurate readings of experimental materials. The standard method of measuring viscosity is through a glass tube viscometer, which...
01:17
Viscosity
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2023
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup. The SI unit of viscosity is...
01:27
Viscosity
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2026
Viscosity is a property of fluids that measures their resistance to flow. It is influenced by factors such as the surface area of contact, the gradient of flow speed, and the fluid's viscosity constant, called the coefficient of viscosity. The coefficient of viscosity, also known as dynamic viscosity, is denoted by the symbol η. It determines the proportionality between the viscous force and the gradient of flow speed.Newton's law of viscosity states that the viscous force on a faster-moving...
02:57
Surface Tension, Capillary Action, and Viscosity
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2020
Surface Tension The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
01:19
Viscosity of Fluid
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2025
Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
FAQs
The key distinction is whether viscosity stays fixed as shear rate changes. In a Newtonian fluid, increasing shear rate does not change viscosity, while non-Newtonian behavior can produce thinning or thickening. This difference affects predicted flow resistance and determines whether a constant-property description or a rate-dependent model is appropriate for an engineering analysis.
Temperature and pressure can alter a fluid’s resistance to flow, so operating conditions must be considered when predicting performance. A viscosity value measured under one condition may not represent behavior under another. Accounting for these effects helps engineers select suitable materials, estimate flow response, and maintain processing or transport conditions within the intended operating range.
Viscosity models represent how flow resistance changes with conditions such as shear rate, allowing engineers to translate rheological measurements into calculations. For fluids that thin or thicken under shear, a constant viscosity assumption may misrepresent performance. Choosing a model that reflects the measured response improves predictions used in equipment design and process control.
Rheological measurements examine the relationship between fluid response and controlled conditions, particularly changes in shear rate, temperature, or pressure. Engineers use the resulting data to determine whether behavior is Newtonian or non-Newtonian and to select an appropriate viscosity model. That characterization provides the basis for predicting performance in a specific engineering system.
Viscosity behavior influences the resistance a fluid presents during transport, which affects how engineers size pipes and pumps. If viscosity changes with shear rate or operating conditions, design calculations must reflect those variations rather than rely on a single fixed value. Better characterization supports more reliable predictions of transport performance and operating requirements.
Engineers apply viscosity behavior when designing lubrication systems, chemical processing equipment, coatings, polymer manufacturing operations, and transport networks. In each case, the fluid’s response helps guide material selection, equipment design, or processing conditions. Understanding how resistance changes also supports control of product handling and system operation across different engineering environments.