Fluid Mechanics
For Laminar flow through a packed bed, the pressure drop is proportional to (Vs is the superficial liquid velocity and Dp is the particle diameter)

Vs/Dp²
Vs²/Dp³
Vs/Dp³
Vs²/Dp²

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Fluid Mechanics
A stream line is

A line connecting the mid points of flow cross-section
Fixed in space in steady flow
Always the path of particle
Drawn normal to the velocity vector at every point

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