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I am a non technical innovator trying to develop a new product. Can someone help me calculate pressure drop and flowrate across a cylinder packed with uniform spheres of 10mm diameter.

I found this online but unable to calculate: https://neutrium.net/fluid_flow/pressure-drop-through-a-packed-bed/

Fluid: Air

Required flowrate: 500 CFM

Inlet Pressure: 4 to 12 inches water column

Outlet Pressure: Atmosphere

Cylinder size: 12 inch diameter

Cylinder height: 12 inches

Packed Spheres diameter: 10mm (attached is a reference of how the media is packed)

What should be the required inlet pressure to achieve a flow rate of 500 CFM ?

or

What will be the flow rate of inlet pressure is 4 inches water column ?

Earliest help/assistance appreciated. Thank you

I found this online but unable to calculate: https://neutrium.net/fluid_flow/pressure-drop-through-a-packed-bed/

Fluid: Air

Required flowrate: 500 CFM

Inlet Pressure: 4 to 12 inches water column

Outlet Pressure: Atmosphere

Cylinder size: 12 inch diameter

Cylinder height: 12 inches

Packed Spheres diameter: 10mm (attached is a reference of how the media is packed)

What should be the required inlet pressure to achieve a flow rate of 500 CFM ?

or

What will be the flow rate of inlet pressure is 4 inches water column ?

Earliest help/assistance appreciated. Thank you