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Henry Darcy
Henry Philibert Gaspard Darcy (; 10 June 1803 – 3 January 1858) was a French engineer who made several important contributions to hydraulics, including Darcy’s law for flow in porous media. Early life Darcy was born in Dijon, France, on June 10, 1803. His first given name is ''Henry''; although the French spelling ''Henri'' appears in multiple sources such as necrological notices, Darcy used the Anglicized spelling. Despite his father's death in 1817 when he was 14, his mother was able to borrow money to pay for his tutors. In 1821 he enrolled at the ''École Polytechnique'' (Polytechnic School) in Paris, and transferred two years later to the School of Bridges and Roads, which led to employment in the Corps of Bridges and Roads. Darcy met an English woman, Henriette Carey, whose family had been living in Dijon, and married her in 1828. Engineering career As a member of the Corps, he built an adequate pressurized water distribution system in Dijon following the failu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dijon
Dijon (, ; ; in Burgundian language (Oïl), Burgundian: ''Digion'') is a city in and the Prefectures in France, prefecture of the Côte-d'Or Departments of France, department and of the Bourgogne-Franche-Comté Regions of France, region in eastern France. the Communes of France, commune had a population of 156,920. The earliest archaeological finds within the city limits of Dijon date to the Neolithic Period (geology), period. Dijon later became a Roman Empire, Roman settlement named ''Divio'', located on the road between Lyon and Paris. The province was home to the Duke of Burgundy, Dukes of Burgundy from the early 11th until the late 15th centuries, and Dijon became a place of tremendous wealth and power, one of the great European centres of art, learning, and science. The city has retained varied architectural styles from many of the main periods of the past millennium, including Capetian, Gothic architecture, Gothic, and Renaissance architecture, Renaissance. Many still-i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Units Of Measurement
A unit of measurement, or unit of measure, is a definite magnitude (mathematics), magnitude of a quantity, defined and adopted by convention or by law, that is used as a standard for measurement of the same kind of quantity. Any other quantity of that kind can be expressed as a multiple of the unit of measurement. For example, a length is a physical quantity. The metre (symbol m) is a unit of length that represents a definite predetermined length. For instance, when referencing "10 metres" (or 10 m), what is actually meant is 10 times the definite predetermined length called "metre". The definition, agreement, and practical use of units of measurement have played a crucial role in human endeavour from early ages up to the present. A multitude of System of measurement, systems of units used to be very common. Now there is a global standard, the International System of Units (SI), the modern form of the metric system. In trade, weights and measures are often a su ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deaths From Pneumonia In France
Death is the end of life; the Irreversible process, irreversible cessation of all biological process, biological functions that sustain a living organism. Death eventually and inevitably occurs in all organisms. The remains of a former organism normally begin to Decomposition, decompose shortly after death. Some organisms, such as ''Turritopsis dohrnii'', are Biological immortality, biologically immortal; however, they can still die from means other than Senescence, aging. Death is generally applied to whole organisms; the equivalent for individual components of an organism, such as Cell (biology), cells or Tissue (biology), tissues, is necrosis. Something that is not considered an organism, such as a virus, can be physically destroyed but is not said ''to die'', as a virus is not considered alive in the first place. As of the early 21st century, 56 million people die per year. The most common reason is aging, followed by cardiovascular disease, which is a disease that af ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Corps Des Ponts , a commune in the Seine-Maritime department in the Haute-Normandie region in France.
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Ponts may refer to: *Ponts, Lleida, a municipality in the province of Lleida, Catalonia, Spain. *Ponts, Manche, a commune in the Manche department in the Lower Normandy region in France. *Ponts-et-Marais Ponts-et-Marais () is a commune in the Seine-Maritime department in the Normandy region in northern France. Geography A village of forestry, light industry and farming situated by the banks of the river Bresle in the Pays de Caux at the junc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Knights Of The Legion Of Honour
A knight is a person granted an honorary title of a knighthood by a head of state (including the pope) or representative for service to the monarch, the church, or the country, especially in a military capacity. The concept of a knighthood may have been inspired by the ancient Greek ''hippeis'' (ἱππεῖς) and Roman ''equites''. In the Early Middle Ages in Western Christian Europe, knighthoods were conferred upon mounted warriors. During the High Middle Ages, a knighthood was considered a class of petty nobility. By the Late Middle Ages, the rank had become associated with the ideals of chivalry, a code of conduct for the perfect Royal court, courtly Christian warrior. Often, a knight was a vassal who served as an elite fighter or a bodyguard for a lord, with payment in the form of land holdings. The lords trusted the knights, who were skilled in Horses in warfare, battle on horseback. In the Middle Ages, a knighthood was closely linked with horsemanship (and especially ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1858 Deaths
Events January–March * January 9 ** Revolt of Rajab Ali: British forces finally defeat Rajab Ali Khan of Chittagong. ** Anson Jones, the last president of the Republic of Texas, commits suicide. * January 14 – Orsini affair: Piedmontese revolutionary Felice Orsini and his accomplices fail to assassinate Napoleon III in Paris, but their bombs kill eight and wound 142 people. Because of the involvement of French émigrés living in Britain, there is a brief anti-British feeling in France, but the emperor refuses to support it. * January 25 – The '' Wedding March'' by Felix Mendelssohn becomes a popular wedding recessional, after it is played on this day at the marriage of Queen Victoria's daughter Victoria, Princess Royal, to Prince Friedrich of Prussia in St James's Palace, London. * January **Benito Juárez becomes the Liberal President of Mexico and its first indigenous president. At the same time, the conservatives installed Félix María Zuloaga as a riv ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1803 Births
Events January–March * January 1 – The first edition of Alexandre Balthazar Laurent Grimod de La Reynière's ''Almanach des gourmands'', the first guide to restaurant cooking, is published in Paris. * January 4 – William Symington demonstrates his ''Charlotte Dundas'', the "first practical steamboat", in Scotland. * January 30 – James Monroe, Monroe and Livingston sail for Paris to discuss, and possibly buy, New Orleans; they end up completing the Louisiana Purchase. * February 19 ** An Act of Mediation, issued by Napoleon Bonaparte, establishes the Swiss Confederation (Napoleonic), Swiss Confederation to replace the Helvetic Republic. Under the terms of the act, Graubünden, Canton of St. Gallen, St. Gallen, Thurgau, the Ticino and Vaud become Swiss cantons. ** Ohio is admitted as the 17th U.S. state. * February 20 – Kandyan Wars: Kandy, Ceylon is taken by a British detachment. * February 21 – Edward Despard and six others are hanged and beheaded for plotti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pitot Tube
A pitot tube ( ; also pitot probe) measures fluid flow velocity. It was invented by French engineer Henri Pitot during his work with aqueducts and published in 1732, and modified to its modern form in 1858 by Henry Darcy. It is widely used to determine the airspeed of aircraft; the water speed of boats; and the flow velocity of liquids, air, and gases in industry. Theory of operation The basic pitot tube consists of a tube pointing directly into the oncoming fluid flow. Pressure in the tube can be measured as the moving fluid cannot escape and stagnates. This pressure is the stagnation pressure of the fluid, also known as the total pressure or (particularly in aviation) the pitot pressure. The measured stagnation pressure cannot just by itself be used to determine the fluid flow velocity (airspeed in aviation) directly. However, with a measured static pressure as well it can be determined by the use of Bernoulli's equation which states: :Stagnation pressure = static pr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hydrogeology
Hydrogeology (''hydro-'' meaning water, and ''-geology'' meaning the study of the Earth) is the area of geology that deals with the distribution and movement of groundwater in the soil and rock (geology), rocks of the Earth's crust (geology), crust (commonly in aquifers). The terms groundwater hydrology, geohydrology, and hydrogeology are often used interchangeably, though hydrogeology is the most commonly used. Hydrogeology is the study of the laws governing the movement of subterranean water, the mechanical, chemical, and thermal interaction of this water with the porous solid, and the transport of energy, chemical constituents, and particulate matter by flow (Domenico and Schwartz, 1998). Groundwater engineering, another name for hydrogeology, is a branch of engineering which is concerned with groundwater movement and design of Well, wells, Pump, pumps, and drains. The main concerns in groundwater engineering include groundwater contamination, conservation of suppli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Darcy Number
In fluid dynamics through porous media, the Darcy number (Da) represents the relative effect of the permeability of the medium versus its cross-sectional area—commonly the diameter squared. The number is named after Henry Darcy and is found from nondimensionalizing the differential form of Darcy's law. This number should not be confused with the Darcy friction factor which applies to pressure drop in a pipe. It is defined as : \mathrm = \frac where * ''K'' is the permeability of the medium ( SI units: ); * ''d'' is the characteristic length, e.g. the diameter of the particle (SI units: ). Alternative forms of this number do exist depending on the approach by which Darcy's Law is made dimensionless and the geometry of the system. The Darcy number is commonly used in heat transfer through porous media. See also * Capillary pressure * Dimensionless quantity Dimensionless quantities, or quantities of dimension one, are quantities implicitly defined in a manner that p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Darcy Friction Factor Formulae
In fluid dynamics, the Darcy friction factor formulae are equations that allow the calculation of the ''Darcy friction factor'', a dimensionless quantity used in the Darcy–Weisbach equation, for the description of friction losses in pipe flow as well as open-channel flow. The Darcy friction factor is also known as the ''Darcy–Weisbach friction factor'', ''resistance coefficient'' or simply ''friction factor''; by definition it is four times larger than the Fanning friction factor. Notation In this article, the following conventions and definitions are to be understood: * The Reynolds number Re is taken to be Re = ''V'' ''D'' / ν, where ''V'' is the mean velocity of fluid flow, ''D'' is the pipe diameter, and where ν is the kinematic viscosity μ / ρ, with μ the fluid's Dynamic viscosity, and ρ the fluid's density. * The pipe's relative roughness ε / ''D'', where ε is the pipe's effective roughness height and ''D'' the pipe (inside) diameter. * ''f'' stands for the D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Darcy (unit)
The darcy (or darcy unit) and millidarcy (md or mD) are Units of measurement, units of Permeability (earth sciences), permeability, named after Henry Darcy. They are not SI, 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 Dimensional analysis, dimensions of length2. Definition Permeability measures the ability of fluids to Fluid flow through porous media, flow through rock (or other porous media). The darcy is defined using Darcy's law, which can be written as: :Q = \frac where: : The darcy is referenced to a mixture of unit systems. A medium with a permeability of 1 darcy permits a flow of 1 cm3/s of a fluid with viscosity 1 Poise (unit), cP (1 pascal second, mPa·s) under a pressure gradient of 1 atm/cm acting across an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
