Weber Number
Weber Number - Related Videos
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12:43
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Cited by 12 •
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Innate defenses to virus infections are triggered by pattern recognition receptors (PRRs). The two cytoplasmic PRRs RIG-I and PKR bind to viral signature RNAs, change conformation, oligomerize, and activate antiviral signaling. Methods are described which allow to conveniently monitor the conformational switching and the oligomerization of these cytoplasmic PRRs.
FAQs
Because velocity is squared in We = ρv²L/σ, increasing the characteristic velocity can raise the Weber number much faster than an equal proportional change in a quantity that appears linearly. The resulting shift indicates a stronger inertial influence relative to surface tension, which can favor greater droplet deformation, breakup, or changes in jet and spray formation.
Density and characteristic length increase the Weber number linearly, whereas surface tension lowers it because it appears in the denominator. Velocity has a stronger mathematical effect because it is squared. In engineering analysis, selecting the relevant fluid properties and geometric scale is essential because the resulting value describes interfacial behavior for the specific moving-fluid situation being studied.
At low Weber numbers, surface tension has the stronger influence, so interfacial structures are more resistant to inertial distortion. At high Weber numbers, inertia becomes more influential, making deformation and breakup more likely in situations such as droplets, jets, and sprays. This distinction helps engineers anticipate whether an interface will remain comparatively coherent or become increasingly disrupted.
First identify the fluid density, characteristic velocity, characteristic length, and surface tension for the moving-fluid case. Substitute those quantities into We = ρv²L/σ, keeping the choices consistent with the system being analyzed. Interpret the resulting dimensionless value by determining whether surface tension or inertia has the stronger influence on the interface.
In fuel-injector and spray engineering, the value helps assess whether moving liquid structures are likely to deform, break up, or support atomization as operating conditions change. That information guides design and optimization of systems that must control how fluid is distributed into droplets. The same interfacial assessment is relevant to jet formation, where the balance affects the developing liquid structure.
The same analysis extends beyond sprays. Engineers can use it when examining coating processes, microfluidic devices, and two-phase flows, each of which involves fluid behavior at an interface. Comparing the balance between inertia and surface tension helps organize these different systems using a common dimensionless measure and supports decisions about fluid-handling design and optimization.