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Process engineers use Poiseuille's law to calculate fluid flow in pipes, specifically for incompressible, laminar flow through cylindrical tubes. It helps them:

1. Design fluid transport systems: By calculating the volumetric flow rate, they can optimize pipe sizes, fluid viscosity, and pressure drops.
2. Optimize energy efficiency: Knowing how pressure affects flow allows engineers to minimize energy consumption in pumping fluids.
3. Assess flow behavior: It's applied in processes like chemical reactors, heat exchangers, or any system where precise fluid flow control is needed.

Poiseuille’s law is especially useful for small-diameter, low-flow applications.