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Related Concept Videos

Excess Pressure Inside a Drop and a Bubble01:13

Excess Pressure Inside a Drop and a Bubble

The shape of a small drop of liquid can be considered spherical, neglecting the effect of gravity. This drop can further be considered as two equal hemispherical drops put together due to surface tension. The forces acting on the spherical drop are due to the pressure of the liquid inside the drop, the pressure due to air outside the drop, and the force due to the surface tension acting on the two hemispherical drops.
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As with waves on a string, the speed of sound or a mechanical wave in a fluid depends on the fluid's elastic modulus and inertia. The two relevant physical quantities are the bulk modulus and the density of the material. Indeed, it turns out that the relationship between speed and the bulk modulus and density in fluids is the same as that between the speed and the Young's modulus and density in solids.
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Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
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Surface Tension of Fluid01:22

Surface Tension of Fluid

Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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Turbulent Flow: Problem Solving01:09

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Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
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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 achieved...

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Droplet acoustofluidics: Recent progress and challenges.

Mushtaq Ali1, Woohyuk Kim1, Muhammad Soban Khan1

  • 1Department of Mechanical Engineering, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju 61186, Republic of Korea.

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Summary
This summary is machine-generated.

Acoustofluidics uses sound waves for precise, contact-free droplet manipulation in biology and medicine. This review explores techniques for droplet generation, separation, merging, and more, highlighting future prospects.

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Area of Science:

  • Biotechnology
  • Microfluidics
  • Acoustics

Background:

  • Acoustofluidics enables contact-free manipulation of micro-objects.
  • Recent progress focuses on droplet manipulation using acoustic waves.

Purpose of the Study:

  • To review acoustofluidic techniques for droplet manipulation.
  • To provide a balanced perspective on applications and future directions.

Main Methods:

  • Exploration of acoustic forces on droplets.
  • Discussion of techniques for droplet generation, separation, merging, splitting, steering, and trapping.
  • Coverage of in-droplet sample manipulation and digital acoustofluidics.

Main Results:

  • Acoustofluidics offers precise control over essential droplet operations.
  • The platform is versatile across diverse biological and medical applications.
  • Key unit operations are detailed, including generation, separation, and merging.

Conclusions:

  • Acoustofluidics is a powerful tool for droplet manipulation in microfluidic systems.
  • The review discusses current prospects and limitations, guiding future research in droplet acoustofluidics.