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Related Concept Videos

Bernoulli's Principle: Applications01:17

Bernoulli's Principle: Applications

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There are many devices and situations in which fluid flows at a constant height and so can be analyzed using Bernoulli's principle. These devices include, but are not limited to, entrainment devices and fluid flow measuring devices.
Entrainment devices use a high fluid speed to create low pressures and, thus, entrain one fluid into another. Some examples of these devices are given below:
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Pipe Flowrate Measurement: Problem Solving01:28

Pipe Flowrate Measurement: Problem Solving

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A spray tank system is engineered to uniformly distribute a pest-control liquid across plants by using a pressurized mechanism. The tank, pressurized to 150 kPa, holds the pesticide at a height of 0.80 meters. Liquid flows from the tank through a 1.9 meter pipe with a diameter of 0.015 meters, angled at 0.698 radians, ultimately reaching a 0.007 meter nozzle that sprays the pesticide. Accurate calculation of the system's flow rate is crucial to ensure uniform application, and this is...
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Free Jet01:14

Free Jet

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Free jets describe the flow of liquid exiting a reservoir through an opening into the atmosphere without resistance. The velocity (v) of the liquid jet is derived using Bernoulli's principle and expressed as:
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Bernoulli's Equation for Flow Normal to a Streamline01:16

Bernoulli's Equation for Flow Normal to a Streamline

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Bernoulli's equation for flow normal to a streamline explains how pressure varies across curved streamlines due to the outward centrifugal forces induced by the fluid's curvature. The pressure is higher on the inner side of the curve, near the center of curvature, and decreases outward to balance these centrifugal forces.
The pressure difference depends on the fluid's velocity and radius of curvature. The pressure variation is minimal in flows with nearly straight streamlines.
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Steady, Laminar Flow in Circular Tubes01:23

Steady, Laminar Flow in Circular Tubes

391
Hagen-Poiseuille flow describes a viscous fluid's steady, incompressible flow through a cylindrical tube with a constant radius R. This flow profile is often applied to understand fluid transport in narrow channels, such as capillaries. It serves as a foundational example of laminar flow. In this model, cylindrical coordinates (r,θ,z) are used to describe the radial (r), angular (θ), and axial (z) dimensions within the tube. For Hagen-Poiseuille flow, the velocity profile is...
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Bernoulli's Principle01:01

Bernoulli's Principle

10.2K
Bernoulli's equation incorporates how fluid pressure changes across a static, incompressible fluid by equating the kinetic energy contribution to zero. It is also helpful in analyzing horizontal flows in which the gravitational energy density is constant throughout. The latter equation is so useful that it is called Bernoulli's principle. According to Bernoulli's principle, the fluid pressure drops if the speed increases and vice versa.
Bernoulli's principle has several...
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Related Experiment Video

Updated: Sep 13, 2025

Modeling and Simulations of Olfactory Drug Delivery with Passive and Active Controls of Nasally Inhaled Pharmaceutical Aerosols
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Increasing Nebulizer Spray Efficiency Using a Baffle with a Conical Surface: A Computational Fluid Dynamics Analysis.

Hung-Chieh Wu1, Fu-Lun Chen2, Yuan-Ching Chiang3

  • 1School of Dentistry, Taipei Medical University, Taipei 11031, Taiwan.

Bioengineering (Basel, Switzerland)
|July 29, 2025
PubMed
Summary
This summary is machine-generated.

Conical baffles in breath-actuated nebulizers improve medication delivery by optimizing internal pressure and flow. This enhancement is crucial for effective aerosol therapy in children and patients with disabilities.

Keywords:
CFDbafflebreath-actuated nebulizer

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Area of Science:

  • Biomedical Engineering
  • Fluid Dynamics
  • Medical Device Design

Background:

  • Breath-actuated nebulizers are essential for aerosol therapy, particularly for pediatric and disabled patients.
  • Nebulizer performance is assessed by medication mass output and droplet size.
  • Optimizing nebulizer design can improve drug delivery efficiency and reduce waste.

Purpose of the Study:

  • To investigate the impact of baffle impact surface geometries on internal pressure and flow streamlines within breath-actuated nebulizers.
  • To determine how different baffle designs influence nebulizer performance for aerosol therapy.

Main Methods:

  • Computational fluid dynamics (CFD) simulations were employed to analyze nebulizer internal fluid dynamics.
  • Computer-aided design (CAD) models of conical symmetric, conical asymmetric, and arc-shaped baffles were simulated.
  • Nebulizer spray output was validated by measuring mass differences.

Main Results:

  • Conical baffle designs demonstrated superior pressure distribution and output streamlines compared to other geometries.
  • Optimal performance was observed with a 0.25 cm protrusion for conical baffles.
  • CFD analysis revealed significant differences in mass output correlating with baffle design.

Conclusions:

  • The geometry of the baffle impact surface significantly affects nebulizer performance.
  • Conical baffles show promise for enhancing nebulizer spray performance and medication delivery efficiency.
  • These findings provide valuable insights for the future design and optimization of aerosol therapy devices.