laminar

Examples of laminar in the following topics:

• Poiseuille's Equation and Viscosity

  • Poiseuille's equation can be used to determine the pressure drop of a constant viscosity fluid exhibiting laminar flow through a rigid pipe.
  • This is generally split into two categories, laminar and turbulent flow.
  • At the lower limit of this mixed turbulent–laminar flow Reynolds number region there is another critical threshold value, below which only laminar flow is possible.
  • In practice, Poiseuille's equation holds for most systems involving laminar flow of a fluid, except at regions where features disrupting laminar flow, such as at the ends of a pipe, are present.
  • Laminar fluid flow in a circular pipe at the same direction.

• Turbulence Explained

  • It is possible to predict if flow will be laminar or turbulent.
  • At low velocity, flow in a very smooth tube or around a smooth, streamlined object will be laminar.
  • In fact, at intermediate velocities, flow may oscillate back and forth indefinitely between laminar and turbulent.
  • Flow is laminar in the large part of this blood vessel and turbulent in the part narrowed by plaque, where velocity is high.
  • In the transition region, the flow can oscillate chaotically between laminar and turbulent flow.

• Motionof an Object in a Viscous Field

  • If N′R is less than about 1, flow around the object can be laminar, particularly if the object has a smooth shape.
  • Depending on the surface, there can be a turbulent wake behind the object with some laminar flow over its surface.
  • For an N′R between 10 and 10^6, the flow may be either laminar or turbulent and may oscillate between the two.
  • (See . ) Laminar flow occurs mostly when the objects in the fluid are small, such as raindrops, pollen, and blood cells in plasma.
  • Here the flow is laminar with N′R less than 1.

• Factors Affecting Pulmonary Ventilation: Airway Resistance

  • The air flow can either be turbulant, transitional or laminar based on the airway.
  • Laminar flow involves an orderly and concentric distribution of layers of air particles and tends to occur in smaller airways, and has lower resistance.
  • Transitional flow occurs in places that branch within smaller airways, in which the air flow becomes in between laminar and turbulent flow and has moderate resistance.
  • Laminar flow (a) has orderly layers and low resistance.

• Viscosity

  • This is called laminar flow (also known as streamlined flow), and the velocity of the fluid's flow varies from close to zero near the pipe's boundaries to its greatest in the center.
  • where F is the force required to move the plate (at constant speed), A is the area of the plate, $\frac {dv_x} {dy}$is the change in laminar velocity with respect to the perpendicular distance to the plate (y-direction).

• Flow Rate and Velocity

  • These factors affect fluid velocity depending on the nature of the fluid flow—particularly whether the flow is turbulent or laminar in nature.
  • In the case of Laminar flow, however, fluid flow is much simpler and flow velocity can be accurately calculated using Poiseuille's Law.

• Cell Migration in Multicellular Organisms

  • Observations in common include cytoplasmic displacement at the leading front and laminar removal of dorsally-accumulated debris toward trailing end.

• Radiation

  • UV light is commonly used to irradiate and sterilize laminar flow cabinets between uses.