What is the formula of Weber number?
The Weber number is defined as(1)We=ρg×ur2×d1σ1where ρg is the gas mass density (kg/m3), ur the relative velocity between gas and liquid (m/s), dl the drop or liquid jet diameter (m), and σl (N/m) the surface tension of the liquid.
What is Weber number used for?
The Weber number is a characteristic number used in fluid mechanics. As a dimensionless quantity, it describes the ratio between deforming inertial forces and stabilizing cohesive forces for liquids flowing through a fluid medium.
What does high Weber number mean?
The higher the Weber number the more dominant is the kinetic energy. This means that most of the inserted energy converts into kinetic energy, i. e. an ejected droplet is faster with higher Weber number.
What forces form a ratio to define the Weber number?
The Weber Number is the ratio between the inertial force and the surface tension force and the Weber number indicates whether the kinetic or the surface tension energy is dominant.
What is characteristic length in Weber number?
In this case the Weber number is defined as the ratio of the momentum in the vapor layer divided by the surface tension force restraining the liquid, where the characteristic length is the surface pore size.
What is significance of Mach number?
The Mach number is primarily used to determine the approximation with which a flow can be treated as an incompressible flow. The medium can be a gas or a liquid.
Is Weber’s equation dimensionless?
The Weber number (We) is a dimensionless number in fluid mechanics that is often useful in analysing fluid flows where there is an interface between two different fluids, especially for multiphase flows with strongly curved surfaces.
Does Mach number increase with temperature?
So, in short – the hotter the air, the higher the Mach number, and the faster you must travel over the ground to break the sound barrier. Also – sudden changes of temperature can change the way a jet engine works, but usually that kind of problem is only caused by other jet engines.
What is the highest Mach number?
Mach 9.6
It’s Official. Guinness World Records recognized NASA’s X-43A scramjet with a new world speed record for a jet-powered aircraft – Mach 9.6, or nearly 7,000 mph.
Why is Strouhal number important?
The Strouhal Number can be important when analyzing unsteady, oscillating flow problems. The Strouhal Number represents a measure of the ratio of the inertial forces due to the unsteadiness of the flow or local acceleration to the inertial forces due to changes in velocity from one point to an other in the flow field.
How is Scruton number calculated?
Scruton Number = cable diameter (m (ft)). This relationship shows that increasing the mass density and damping of the cables increases the Scruton number.