Recent content by ranaroy

energy of impact dear all, i would like to calculate the energy loss of a spherical particle after it hits the wall. i know the pre- and post-impact velocties and the coefficients of restitution. simple E = E1 = 1/2*m*u^2 is not enough. can someone point me any exact references...

extremely sorry..i meant that the final expression is omega_c_x=0, omega_c_y=0, omega_c_z = dv_dx - du_dy this means i have only i set of real value for omega_c in 2D, while in 3-D i have all real values for omega_c_x, omega_c_y, omega_c_z am i right ?

dear Mentor, yes, i checked it now :) so, the axis of rotation is z. then i write omega_c_z=dv_dx - du_dy so, i will not get two components ? but why in 3D system, we get all 3 components of omega i.e., omega_c_x, omega_c_y, omega_c_z ? sorry, if i sound foolish ! hope to get ur...

hi all, let me make my problem more clear. my question is indeed to resolve the curl of u. where, u = linear velocity resolved into x- and y- cartesian cordinates. (del) cross (u) = curl(u) which measures a vector field's tendency to rotate about a point. Now, let us represent this...

Homework Statement omega_c = (nabla) cross (u) where omega_c is the rotational velocity of a particle nabla refers to the gradient operator u is the linear velocity of the particle Homework Equations what are the expressions of omega_c_x = omega_c_y = i.e, in x- and...

hi all, a similar post for me. pls help me. i need to calculate the energy lost by a solid sphere (~ 0.5 mm dia) on hitting the solid wall obliquely. i know the tangetial and normal velocities and the restitution coefficients. what other parameters do i need to know ?? help with the...

sir, yes, i am trying to calculate erosion caused by sand grain. there are may literature data available for various tyoes of sand, and so i am confused. i am using sand blown by air (maybe dry quicksand or something) at high velocities.. hope to get the values..a reference to online...

dear all, pls inform me the Young's modulus (in Pa) and Poisson's ration for sand. Pleae also inform the density of sand taken (as it affects the requested values). many thanks in advance kind regards, rana

sorry, the above velocity components should read V_y = 3 m/s , V_x = 4 m/s sorry for the mistake.

dear asaplease, thank you for your try. can u explain it once more in detail. i didnt understand well. you mean to say, first i will do theta = atan(V_y/V_x) and calculate the angle. then, what shoud i do ? to make it more clear for me, can u do one example case. say V_y = 3 m/s ...

dear all, i am working on a problem, but not having found the solution yet. i have a wall section (in a 2D x-y plane) on which spherical balls hit and get reflected. i know the x-velocity and y-velocity of the particle when it hits the wall. i need to calculate the impact (incident)...