## Bulk enthalpy

Ratio of the enthalpy transported by the entire mass of flowing fluid per unit time across a given flow cross section and the mass flow rate.

*h*is the enthalph of the fluid per unit mass,

*ρ*is the density of the fluid,

*u*is the velocity component perpendicular to the flow cross section, and

*s*is the area of flow cross section.

Heat & Mass Transfer, and Fluids Engineering