Bulk flow意思

"Bulk flow" is a term used in fluid mechanics and specifically in the context of fluid transport through porous media. It refers to the movement of fluid through a porous medium due to a pressure gradient, where the fluid moves as a continuous mass or body rather than as individual molecules or particles.

In bulk flow, the fluid is driven by a pressure difference between two points, and the velocity of the fluid within the pores of the porous medium is relatively high compared to the Darcy velocity, which is the average velocity of the fluid through the medium. Bulk flow is characterized by its ability to transport large amounts of fluid quickly through the porous medium.

Bulk flow is an important concept in a variety of applications, including groundwater hydrology, soil science, and petroleum engineering, where it is used to understand how fluids such as water, oil, and gas move through underground formations.