Hydrodynamic Stability
Hydrodynamic Stability - Related Videos
10:13
A Microfluidic-based Hydrodynamic Trap for Single Particles
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Cited by 14 •
2011
In this article, we present a microfluidic-based method for particle confinement based on hydrodynamic flow. We demonstrate stable particle trapping at a fluid stagnation point using a feedback control mechanism, thereby enabling confinement and micromanipulation of arbitrary particles in an integrated microdevice.
12:54
Transient Expression of Proteins by Hydrodynamic Gene Delivery in Mice
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Cited by 25 •
2014
In vivo transfection of naked DNA by hydrodynamic gene delivery introduces genes into the tissue of an animal with minimal inflammatory response. Sufficient amounts of gene product are generated such that gene function and regulation as well as protein structure and function can be analyzed.
11:12
Protocol for Relative Hydrodynamic Assessment of Tri-leaflet Polymer Valves
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Cited by 5 •
2013
There has been renewed interest in developing polymer valves. Here, the objectives are to demonstrate the feasibility of modifying a commercial pulse duplicator to accommodate tri-leaflet geometries and to define a protocol to present polymer valve hydrodynamic data in comparison to native and prosthetic valve data collected under near-identical conditions.
06:56
An Ex Vivo Porcine Model for Hydrodynamic Testing of Experimental Aortic Valve Procedures and Novel Medical Devices
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Cited by 1 •
2023
We present a method for mounting a porcine aortic valve on a pulse duplicator to test its hydrodynamic properties. This method can be used to determine the change in hydrodynamics after the application of an experimental procedure or novel medical device prior to use in a large animal model.
03:18
Nuclear Stability
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2020
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters. To hold positively charged protons together in the...
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These factors determine whether a small disturbance is damped or amplified. Viscosity influences the fluid’s response to perturbations, while density differences and gravity affect stratified layers. Shear and flow speed modify how neighboring fluid regions move relative to one another. Together, these conditions control whether flow remains orderly or progresses toward instability and possible turbulence.
Linear stability analysis examines how small perturbations change under specified flow conditions. It identifies the conditions under which disturbances grow rather than remain controlled, providing a way to evaluate the onset of instability. This approach is especially useful for connecting changes in viscosity, density, gravity, shear, or speed with the possible transition from orderly flow to turbulence.
Density differences and gravity can organize fluids into stratified layers, meaning regions with distinct density arrangements. Stability analysis evaluates how disturbances interact with that structure and whether waves or other changes develop. In environmental systems, this helps explain patterns in oceans, lakes, rivers, and the atmosphere, where layering and gravitational effects influence mixing and transport.
Shear describes differences in motion between adjacent parts of a fluid, while flow speed characterizes how rapidly the system moves. Changes in either condition can alter the behavior of small disturbances and affect whether they grow. Examining these variables helps explain why environmental flows may shift from relatively orderly transport to more complex patterns associated with instability and turbulence.
An evaluation begins by identifying the relevant flow conditions, including viscosity, density differences, gravity, shear, and speed. Researchers then examine how small perturbations respond, often using linear stability analysis to determine whether they grow. The resulting stability assessment can be related to observed or expected waves, stratified layers, mixing, and transport patterns in the environment.
It is useful when researchers need to understand how fluids carry substances or particles through oceans, lakes, rivers, or the atmosphere. Stability principles support predictions of pollutant dispersion and sediment movement by linking flow conditions with mixing and transport patterns. They also help assess how changing conditions may influence aquatic and atmospheric behavior.