Question: I need help with this problem. Use Darcy's Law to derive an equation for the volumetric flow rate ( Q v ) through a porous

I need help with this problem.
Use Darcy's Law to derive an equation for the volumetric flow rate (Qv) through a porous
sphere. The sphere has a radius Re and a hollow core with radius Ri. A cross-section of
the sphere is provided below. Assume that the pressure inside the sphere (Pi) is greater
than the pressure outside the sphere (Pe), thus driving the flow outward radially.
I need help with this problem. Use Darcy's Law to derive

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