It is the ratio of inertial forces acting on the fluid to the surface tension acting forces. ‘D’ is characteristic length,  fluid density,  fluid velocity and  is surface tension acting on the fluid. |
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Saturday, 6 April 2013
Weber Number
Reynolds Number
| Reynolds number is ratio of the inertial forces in a flowing fluid to the viscous forces acting on the fluid. |
Mach Number
| Mach number for a moving object is the ratio of speed of that object moving in a fluid (u) to the speed of sound in the fluid (a). |
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