dynamic viscosity

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dynamic viscosity

A scientist measures the dynamic viscosity of a honey sample.

Definition
  1. Noun:
    • A measure of a fluid's internal resistance to flow when a shear force is applied: Dynamic viscosity quantifies how much a fluid resists deformation or movement when subjected to a tangential force. It describes the "thickness" or "stickiness" of a fluid in motion.
    • A key property in fluid mechanics: It is a fundamental parameter used to characterize how fluids behave under stress, influencing flow rates, energy losses, and heat transfer.
Usage Examples
  • Noun:
    • Engine oil has a higher dynamic viscosity than water, which is why it flows more slowly.
    • The engineer calculated the dynamic viscosity of the polymer solution to design the pump correctly.
    • A change in temperature significantly affects the dynamic viscosity of most fluids.
Advanced Usage

  • "Shear-dependent dynamic viscosity": Refers to fluids whose viscosity changes with the applied shear rate (e.g., non-Newtonian fluids like ketchup or blood).

    • The non-Newtonian fluid exhibited shear-thinning behavior, meaning its dynamic viscosity decreased as the shear rate increased.

  • "Kinematic viscosity vs. dynamic viscosity": Kinematic viscosity is the ratio of dynamic viscosity to fluid density.

    • While dynamic viscosity measures internal resistance, kinematic viscosity accounts for both resistance and inertial effects by incorporating density.
Variants and Related Words

  • Viscosity (n): A more general term for a fluid's resistance to flow. Dynamic viscosity is a specific type of viscosity.

    • The viscosity of honey is what makes it drip slowly.

  • Absolute viscosity (n): Another term for dynamic viscosity.

    • The data sheet lists the absolute viscosity of the lubricant at various temperatures.

  • Newtonian fluid (n): A fluid whose dynamic viscosity remains constant regardless of the applied shear rate.

    • Water and air are common examples of Newtonian fluids.
Synonyms
  • Absolute viscosity: The direct synonym for dynamic viscosity.
  • Shear viscosity: Emphasizes that the property is defined in response to shear stress.
Related Phrases

  • Viscosity coefficient: Often used interchangeably with dynamic viscosity in equations.

    • The Navier-Stokes equations include the viscosity coefficient to model fluid motion.

  • Dynamic viscosity measurement: The process of determining this property.

    • The lab is equipped for precise dynamic viscosity measurement using a rotational viscometer.
dynamic viscosity

A scientist measures the dynamic viscosity of a honey sample.

Noun
  1. a measure of the resistance to flow of a fluid under an applied force

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