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maistral

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- Do I add the potential energy term?

I am quite familiar with the Ergun equation's formulation.

My question is, do I need to subtract the potential term

Thanks.

My question is, do I need to subtract the potential term

**ΔP/Δz = -ρg/g**after the Ergun equation's own ΔP/Δz , assuming that the fluid is to be pumped upward, from the bottom of the bed to the top of the bed? I was thinking it should be negative because the fluid is counteracting gravity (fluid is flowing upward), which means that the pressure drop is greater._{c}Thanks.