👉 The sand fluid, also known as a dilute brine or a porous fluid, is a mixture of water and fine-grained sand particles that behaves like a viscous fluid when subjected to pressure. This unique combination allows it to flow through the tiny pores within the sand, even against gravity, due to capillary forces. The fluid's properties are highly dependent on the size and distribution of the sand grains, as well as the salinity and temperature of the brine. This behavior is crucial in various natural and industrial processes, such as oil and gas extraction, where it helps in the displacement of hydrocarbons from rock pores.
