Difference between revisions of "Ball Drop"

Latest revision as of 13:02, 3 September 2018

Ball-Drop Multistage Fracturing

Equation used to calculate ball speed in fluid:

V=sqrt(4*g*d(rhos-rho)/rho/(3*Cd))

where

V - Velocity

g - gravitational accelerations

d - diameter of spherical object

rhos - density of object

rho - density of fluid

Cd - drag coefficient (Drag coefficient - follow wikipedia), calculated as:

re - Reynolds number

re=rho*V*d/mu

where

rho - density of the fluid

V - velocity of the fluid with respect to the object

d - diameter of spherical object

my - viscosity of the fluid

@@ Line 3: / Line 3: @@
 Equation used to calculate ball speed in fluid:
-<center><code>V=sqrt(4*g*d(rhos-rho)/rho/(3*Cd)</code></center>
+<center><code>V=sqrt(4*g*d(rhos-rho)/rho/(3*Cd))</code></center>
+[https://en.wikipedia.org/wiki/Terminal_velocity Terminal velocity - follow wikipedia]
 where
@@ Line 17: / Line 18: @@
 <code>rho</code> - density of fluid
-<code>Cd</code> - drag coefficient
+<code>Cd</code> - drag coefficient ([https://en.wikipedia.org/wiki/Drag_coefficient Drag coefficient - follow wikipedia]), calculated as:
+<center>[[File:Drag_vs_re.png]]</center>
+<code>re</code> - Reynolds number
+<center><code>re=rho*V*d/mu</code></center>
+where
+<code>rho</code> - density of the fluid
+<code>V</code> - velocity of the fluid with respect to the object
+<code>d</code> - diameter of spherical object
+<code>my</code> - viscosity of the fluid
+[https://en.wikipedia.org/wiki/Reynolds_number Reynolds number - follow wikipedia]