China
Africa
Explore chapters and articles related to this topic
Glossary of scientific and technical terms in bioengineering and biological engineering
Published in Megh R. Goyal, Scientific and Technical Terms in Bioengineering and Biological Engineering, 2018
Imbibition (L. imbibere, to drink) refers to: (1) The absorption of liquids or vapors into the ultramicroscopic spaces or pores found in materials; (2) The initial water uptake by seeds starting germination.
On the consequences of shale desaturation: physicochemical and mechanical perspectives
Published in Petroleum Science and Technology, 2023
In the absence of a hydraulic pressure gradient, it is fair to say that water transport into or out of shale during drilling (in situ conditions) is mainly controlled by chemical osmosis and diffusion osmosis. Thus, many laboratory researchers have focused on solving shale swelling problems by exploiting these two phenomena: chemical osmosis and diffusion osmosis. However, shale swelling data observed in the laboratory could be misleading and do not necessarily result from chemical osmosis and diffusion osmosis (Santarelli and Carminati 1995). Such data could be mainly due to spontaneous imbibition of water in dry shale samples. Imbibition is defined as a movement in which wetting fluid occupies pore space through displacement of non-wetting fluid. The inappropriate preservation and poor mishandling of shale cores during coring and transportation could dry out shale and introduce air inside its pores network (Chenevert and Amanullah 1997). When dry shale is exposed to aqueous solutions, water will be imbibed spontaneously into the shale by capillary forces. This spontaneous imbibition could be misread as water transport by chemical or diffusion osmosis. The capillary “suction” pressure responsible for imbibition is given by: where; Pc is the capillary suction pressure; is surface tension forces developed at the air–water interfaces; θ is the contact angle and r is the pore throat radius.
Solution based freeze cast polymer derived ceramics for isothermal wicking - relationship between pore structure and imbibition
Published in Science and Technology of Advanced Materials, 2019
Daniel Schumacher, Dawid Zimnik, Michaela Wilhelm, Michael Dreyer, Kurosch Rezwan
Besides these applications, the aerospace industry uses porous materials in propellant management devices or liquid acquisition devices for phase separation to ensure gas-free liquid delivery to the engines [8,9]. The liquid is transported by the capillary pressure in the pores of the porous material to rewet parts of the screen that dry out. A saturated porous medium prevents the penetration of gas, as long as the bubble point pressure is not exceeded. Imbibition is commonly defined as the displacement of a non-wetting fluid by a wetting fluid in a porous medium. Wicking is used to make a statement about the capillary-driven transport ability in porous materials.