The darcy (or darcy unit ) and millidarcy (md or mD) are units of permeability , named after Henry Darcy . They are not SI units , but they are widely used in petroleum engineering and geology . The unit has also been used in biophysics and biomechanics, where the flow of fluids such as blood through capillary beds and cerebrospinal fluid through the brain interstitial space is being examined. A darcy has dimensions of length .
10-677: (Redirected from MDs ) [REDACTED] Look up Md or .md in Wiktionary, the free dictionary. MD , Md , mD or md may refer to: Medicine [ edit ] M.D. (from Latin Medicinae Doctor ) or Doctor of Medicine , a medical degree MD (Ayurveda) , a medical degree in India MD (Homeopathy) , a medical degree in India Ménière's disease ,
20-1009: A chemical warfare agent Millidarcy (mD), a unit of fluid permeability Molecular dynamics Membrane distillation Earthquake duration magnitude (M d ) Other uses [ edit ] MD, 1500 in Roman numerals Majority decision , in full-contact combat sports Managing director , of a company Marque déposée or trademark in Canada in Unicode subscripts and superscripts Match Director in International Practical Shooting Confederation match Military districts of Russia , sometimes abbreviated as MD Mandal , an administrative sub division (third-tier) in India MDMA , sometimes abbreviated as MD Topics referred to by
30-963: A disorder of the inner ear Muscular dystrophy , a group of diseases involving breakdown of skeletal muscles Places [ edit ] Moldova (ISO country code MD) Maryland (US postal abbreviation MD) Magdeburg (vehicle plate prefix MD), a city in Germany Mödling District (vehicle plate prefix MD), in Lower Austria, Austria People [ edit ] Muhammad (name) or Mohammed (Md) Arts, entertainment, and media [ edit ] Music [ edit ] Main droite or mano destra (MD or m.d.; "right hand"), in piano scores Music director Mini Disc Other arts, entertainment, and media [ edit ] MDs (TV series) , 2002 Materiali e discussioni per l'analisi dei testi classici , ("Materials and discussions for
40-592: A format Microdrive , a type of miniature hard drive mkdir or md , "make directory" command Multiple device, as in Linux mdadm device driver Sega Genesis or Mega Drive, a video game console Other uses in science and technology [ edit ] Mean absolute difference Mendelevium , symbol Md, a chemical element Mesoscale discussion in Storm Prediction Centers and Weather Prediction Centers Methyldichloroarsine ,
50-510: A permeability of approximately 1 darcy. Tissue permeability, whose measurement in vivo is still in its infancy, is somewhere in the range of 0.01 to 100 darcy. The darcy is named after Henry Darcy . Rock permeability is usually expressed in millidarcys (md) because rocks hosting hydrocarbon or water accumulations typically exhibit permeability ranging from 5 to 500 md. The odd combination of units comes from Darcy's original studies of water flow through columns of sand. Water has
60-428: A viscosity of 1.0019 cP at about room temperature. The unit abbreviation "d" is not capitalized (contrary to industry use). The American Association of Petroleum Geologists uses the following unit abbreviations and grammar in their publications: Converted to SI units, 1 darcy is equivalent to 9.869 233 × 10 m or 0.9869233 μm . This conversion is usually approximated as 1 μm . This
70-535: Is different from Wikidata All article disambiguation pages All disambiguation pages Md">Md Too Many Requests If you report this error to the Wikimedia System Administrators, please include the details below. Request from 172.68.168.226 via cp1108 cp1108, Varnish XID 223842927 Upstream caches: cp1108 int Error: 429, Too Many Requests at Thu, 28 Nov 2024 08:00:16 GMT Millidarcy Permeability measures
80-543: The ability of fluids to flow through rock (or other porous media). The darcy is defined using Darcy's law , which can be written as: where: The darcy is referenced to a mixture of unit systems. A medium with a permeability of 1 darcy permits a flow of 1 cm /s of a fluid with viscosity 1 cP (1 mPa·s ) under a pressure gradient of 1 atm/cm acting across an area of 1 cm . Typical values of permeability range as high as 100,000 darcys for gravel, to less than 0.01 microdarcy for granite. Sand has
90-427: The analysis of classical texts"), an Italian journal Murder Drones , an Australian animated web series Brands and enterprises [ edit ] Air Madagascar , IATA airline code McDonnell Douglas aircraft model prefix MD Helicopters Science and technology [ edit ] Computing [ edit ] .md , Internet top-level domain for Moldova Markdown (file extension .md),
100-533: The same term [REDACTED] This disambiguation page lists articles associated with the title MD . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=MD&oldid=1227190001 " Category : Disambiguation pages Hidden categories: Articles containing French-language text Articles containing Italian-language text Articles using Md magnitude scale Short description
#663336