Help me solving this differential equation please

[ahm_11]

μ[u_yy + u_zz] - ∂p/∂x = 0 ... (1)

∂u/∂x = 0 ;

i tried assuming u(y,z) = Y(y)Z(z)

so (1) becomes ... μ[ZY_yy + YZ_zz] - ∂p/∂x = 0

hence (1/Y)*Y_yy + (1/Z)*Z_zz = (R/YZ) = -λ²
where, R = (1/μ)*∂p/∂x

now Y_yy + λ²Y = 0 ... can be solved easily but what about the remaining part ... i couldn't solve it due to the constant ...

 

[Mark44]

μ[u_yy + u_zz] - ∂p/∂x = 0 ... (1)

∂u/∂x = 0 ;

i tried assuming u(y,z) = Y(y)Z(z)

so (1) becomes ... μ[ZY_yy + YZ_zz] - ∂p/∂x = 0

hence (1/Y)*Y_yy + (1/Z)*Z_zz = (R/YZ) = -λ²
where, R = (1/μ)*∂p/∂x

now Y_yy + λ²Y = 0 ... can be solved easily but what about the remaining part ... i couldn't solve it due to the constant ...

Is there any other information? In particular, is there anything known about p?

 

[ahm_11]

∂p/∂x = constant

Some boundary conditions:
x=0 , x=L ... ∂u/∂x = 0 , v=0 , w=0 , ∂p/∂x = constant
y=-a,y=a ... u=0,v=0,w=0, ∂p/∂y=0
z=-b,z=b ... u=0,v=0,w=0, ∂p/∂z = 0

 

[Ray Vickson]

μ[u_yy + u_zz] - ∂p/∂x = 0 ... (1)

∂u/∂x = 0 ;

i tried assuming u(y,z) = Y(y)Z(z)

so (1) becomes ... μ[ZY_yy + YZ_zz] - ∂p/∂x = 0

hence (1/Y)*Y_yy + (1/Z)*Z_zz = (R/YZ) = -λ²
where, R = (1/μ)*∂p/∂x

now Y_yy + λ²Y = 0 ... can be solved easily but what about the remaining part ... i couldn't solve it due to the constant ...

Since \partial{p}/\partial{x} = c (a constant) your DE is just
u_{yy} + u_{zz} = k,
where k = c/ \mu is a constant. Your condition u_x = 0 means that 'x' does not appear anywhere in the problem.

RGV