Inertial Focusing
Inertial Focusing - Related Videos
08:08
Oscillation and Reaction Board Techniques for Estimating Inertial Properties of a Below-knee Prosthesis
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Cited by 35 •
2014
Body segmental inertial properties are required for inverse dynamics modeling. Using an oscillation and reaction board technique, inertial properties of below-knee prostheses were measured. Using direct measures of prosthesis inertia in the inverse dynamics model of the prosthetic leg resulted in lower magnitudes of resultant joint forces and moments.
01:03
Inertial Frames of Reference
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2023
Newton’s first law is usually considered to be a statement about reference frames. It provides a method for identifying a special type of reference frame: the inertial reference frame. In principle, we can make the net force on a body zero. If its velocity relative to a given frame is constant, then that frame is said to be inertial. So, by definition, an inertial reference frame is a reference frame where Newton's first law holds valid. Newton's first law applies to objects with constant...
01:27
Non-inertial Frames of Reference
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2023
A reference frame accelerating or decelerating relative to an inertial frame is a non-inertial frame. To help understand this, consider what taking off in an airplane, turning a corner in a car, riding a merry-go-round, and the circular motion of a tropical cyclone all have in common. All these systems are accelerating, decelerating, or rotating relative to the Earth; hence, they all are non-inertial frames. All these systems exhibit inertial forces, which merely seem to arise from motion,...
09:30
Focused Ion Beams
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2023
Source: Sina Shahbazmohamadi and Peiman Shahbeigi-Roodposhti-Roodposhti, School of Engineering, University of Connecticut, Storrs, CT As electron microscopes become more complex and widely used in research labs, it becomes more of a necessity to introduce their capabilities. Focused ion beam (FIB) is an instrument that can be employed in order to fabricate, trim, analyze and characterize materials on mico- and nano-scales in a wide variety of fields from nano-electronics to medicine. FIB...
01:16
Focusing of Light in the Eye
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2024
Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
FAQs
Inertial lift forces result from interactions among a suspended cell or particle, the channel walls, and the local velocity profile. At finite Reynolds numbers, these interactions create predictable migration toward particular locations in the flowing channel. The resulting spatial organization allows biological samples to become concentrated and aligned without requiring an externally applied field.
Curved channels generate secondary Dean flows that modify particle migration in addition to the inertial lift forces already present. These cross-sectional flows can influence where cells move and how they become ordered within the channel. Accounting for this interaction is important when using curved microfluidic designs for separation, enrichment, or alignment of biological samples.
Inertial focusing relies on fluid motion, channel walls, velocity profiles, and, in curved channels, secondary Dean flows. It therefore positions suspended cells through passive hydrodynamic effects rather than an external field. This distinction is relevant in bioengineering because the same flow-based approach can support continuous, high-throughput handling while concentrating and aligning biological samples.
The flowing channel provides the environment in which inertial lift forces act on suspended cells or particles. Its walls and velocity profile directly participate in migration, while curvature can add Dean-flow effects. Together, these features determine whether the sample becomes concentrated, aligned, separated, enriched, counted, or ordered for a downstream bioengineering task.
A sample containing suspended cells or particles is introduced into a microfluidic channel and carried by a flow operating at finite Reynolds number. Inertial interactions then drive migration toward predictable locations, with curved channels potentially adding Dean-flow effects. The focused and aligned output can be directed toward separation, enrichment, counting, or ordering applications.
The technique can concentrate and align cells, producing organized sample streams that support separation, enrichment, counting, and ordering. These outcomes make the method useful when researchers need to handle biological samples at high throughput. Its passive operation also allows integration with downstream diagnostic and therapeutic systems described in bioengineering workflows.
Inertial focusing is useful when a bioengineering workflow requires passive handling of complex biological samples for cell isolation or analysis. The overview identifies circulating tumor cell isolation and blood analysis as relevant applications, alongside cell sorting. Focused cell streams can also be integrated with downstream diagnostic or therapeutic systems, extending the method beyond initial positioning.