Build a 15,000 rpm Tesla Turbine using hard drive platters Here's a project that uses some of those dead hard drives you've got lying around. In the Tesla Turbine, air, steam, oil, or any other fluid is injected at the edge of a series of smooth parallel disks. The fluid spirals inwards and is exhausted through ventilation ports near the center of the disks. A regular blade turbine operates by transferring kinetic energy from the moving fluid to the turbine fan blades. In the Tesla Turbine, the kinetic energy transfer to the edges of the thin platters is very small. Instead, it uses the boundary layer effect, i.e. adhesion between the moving fluid and the rigid disk. To build a turbine like this, you need some dead hard drives, some stock material (aluminum, acrylic), a milling machine with a rotary table, and a lathe with a 4 jaw chuck. Wikipedia has a good review article ( as well as articles about I run my turbine on compressed air (40 psi), and it easily reaches speeds of 10-15,000 rpm.
Fluide parfait Un article de Wikipédia, l'encyclopédie libre. En mécanique des fluides, un fluide est dit parfait s'il est possible de décrire son mouvement sans prendre en compte les effets de viscosité et de la conductivité thermique[1]. Avec en plus l'hypothèse, de validité très générale, de conservation de la masse[2], le mouvement du fluide est donc isentropique[3]. Mathématiquement cela revient à annuler les termes correspondants dans l'équation de Navier-Stokes, on obtient ainsi l'équation d'Euler des fluides. Ce sont le produit des coefficients de viscosité et de conductivité thermique (et pas seulement ces coefficients) avec respectivement les cisaillements de vitesse et les gradients thermiques, qui doivent être négligeables. Tous les fluides ayant une viscosité (sauf un superfluide, ce qui en pratique ne concerne guère que l'hélium à très basse température et l'intérieur d'une étoile à neutrons), le fluide parfait ne peut être qu'une approximation pour une viscosité tendant vers zéro. où d'où
Stirling engine Alpha type Stirling engine. There are two cylinders. The expansion cylinder (red) is maintained at a high temperature while the compression cylinder (blue) is cooled. Beta type Stirling engine. Originally conceived in 1816 as an industrial prime mover to rival the steam engine, its practical use was largely confined to low-power domestic applications for over a century.[3] The Stirling engine is noted for its high efficiency compared to steam engines,[4] quiet operation, and the ease with which it can use almost any heat source. Name and classification[edit] Robert Stirling was a Scottish minister who invented the first practical example of a closed cycle air engine in 1816, and it was suggested by Fleeming Jenkin as early as 1884 that all such engines should therefore generically be called Stirling engines. There are many possible implementations of the Stirling engine most of which fall into the category of reciprocating piston engine. History[edit] Invention and early development[edit]
Tesla turbines for highschool students Here are some photos of some Tesla Turbines my Highschool Engineering students created as part of their studies into mechanisms and power transfer. Their brief was to investigate experimental power generation systems and create a prototype using available materials. I have provided the Task Overview below. Once the turbines where complete we tested their RPM and efficiency using a car timing light, changed and improved parts such as bearings etc and retested to see improvements in efficiency. Task Overview (scenario) Global - Tech Engineering are a socially conscious Engineering firm. The system must have the following considerations: high efficiency. made from available, cost efficient materials (preferably recycled or low impact materials). environmentally sound (no harmful by-products or toxic materials). small – scale or easily disassembled. be able to be mass produced in a standard workshop.
Superfluide Un article de Wikipédia, l'encyclopédie libre. La superfluidité est un état de la matière dans lequel celle-ci se comporte comme un fluide dépourvu de toute viscosité. Découverte en 1937 par Pyotr Leonidovitch Kapitsa, simultanément avec, semble-t-il, John F. Allen et A. Point lambda[modifier | modifier le code] Les physiciens mentionnés ci-dessus ont constaté qu'en dessous de la température critique de 2,17 kelvins, (soit -270,98 °C), qui est appelé le point lambda (λ), l'hélium 4 subissait une transition de phase. Des expériences plus spécifiques à la mécanique des fluides montrèrent ensuite que l'écoulement de cet hélium dans un tuyau était sensiblement indépendant de la pression appliquée sur les parois du tuyau, et de plus indépendant de la section du tuyau en question. Ceci ne pouvait s'expliquer que par une absence totale de viscosité, d'où le nom de superfluidité. Finalement, un liquide est dit superfluide s’il n'oppose aucune résistance à l'écoulement. Portail de la physique
forum • Index page It is currently Wed Apr 23, 2014 8:07 am View unanswered posts • View active topics Bus Pirate Support Hacking multi-tool. Get one for $30, including worldwide shipping. Subforums: Bus Pirate Development, Flashrom, OpenOCD JTAG, Pirate PIC programmer, AVRDude 1168 Topics 10269 Posts Last post by RaspbJan Sat Apr 19, 2014 4:59 pm Open Bench Logic Sniffer A cheap logic analyzer. General discussion Anything not related to a specific project. 999 Topics 9025 Posts Last post by EasyRider Tue Apr 22, 2014 3:30 pm Tools of the trade Reflow ovens, hot plates, pick and place machines, test rigs, solder stencils. Past projects Ian's previous project, including Dangerous Prototypes, Hack a Day, DIY Life, Instructables, and SourceForge projects. 38 Topics 250 Posts Last post by sqkybeaver Tue Apr 15, 2014 7:06 am Statistics Total posts 55306 • Total topics 5797 • Total members 3009 • Our newest member lakishaym60
Student invention lets Guatemalans pump water on the go University of Sheffield student Jon Leary was required to “make something useful out of rubbish” as part of his dissertation. What he ended up doing was transforming lives. As part of his studies as a Mechanical Engineering major, Leary spent four months in Guatemala. There, he introduced the locals to his bicibomba movil, a mobile bicycle-powered water pump. View all Leary developed the system while still in the UK. “The inspiration came from regular pannier racks that are used on touring bikes to carry things over the back wheel of a bike” Leary told us. The bicibomba movil was introduced with the help of Maya Pedal, a local organization that champions pedal-powered technology in the region. The mobile aspect of Leary’s invention, however, makes it attractive to farmers. Jon’s device can reportedly be made quite easily, using standard tools along with old bikes, bits of metal, and scrapped electric centrifugal water pumps.
Étoile à neutrons Un article de Wikipédia, l'encyclopédie libre. Historique[modifier | modifier le code] Le concept d'étoiles à neutrons est né immédiatement après la découverte du neutron en 1932 par James Chadwick. Le physicien Lev Landau proposa alors qu'il puisse exister des astres presque entièrement composés de neutrons et dont la structure serait déterminée par un effet de mécanique quantique appelé pression de dégénérescence, à l'instar d'une autre classe d'astres, les naines blanches dont la structure est déterminée par la pression de dégénérescence des électrons. Deux ans plus tard, en 1934, les astronomes Walter Baade et Fritz Zwicky eurent l'intuition que le passage d'une étoile ordinaire à une étoile à neutrons libèrerait une quantité considérable d'énergie et donc de rayonnement électromagnétique, donnant l'illusion de l'allumage d'un astre nouveau. L'étude des étoiles à neutrons n'a pris son essor qu'à partir de leur phénomène d'émission pulsée les révélant sous la forme de pulsar.
Build an Amazing Tesla CD Turbine Build a real working turbine from recycled CD's! This Tesla CD Turbine is based on the Tesla turbine, which was invented by Nikola Tesla in the early 1900's. Tesla's pumps and motors were unique in that they only used discs, and took advantage of the boundary layer effect. His smallest designs were over 100 horsepower. This Instructable is an introduction to my recently developed Tesla CD Turbine, which is made from CD's, CD spindle, pipe fittings and glue. The basic model Tesla CD Turbine shows how the boundary layer idea works to deliver power. The advanced model has many cool features, such as the use of neodymium magnets to separate the CD's with the correct gap and a Magnetic Coupler to attach implements, and much more. My next CD Turbine Instructable shows how to make a Magnetic Disc Pack and Magnetic Coupler for more advanced CD Turbine experimentation. However, please be forewarned that this turbine on air pressure is not really a kid's toy or particularly safe to operate.
Ball lightning A 1901 depiction of ball lightning Ball lightning is an unexplained atmospheric electrical phenomenon. The term refers to reports of luminous, spherical objects with diameters varying from pea-sized to several meters. It is usually associated with thunderstorms, but lasts considerably longer than the split-second flash of a lightning bolt. Many early reports say that the ball eventually explodes, sometimes with fatal consequences, leaving behind the odor of sulfur.[1][2] Many scientific hypotheses about ball lightning have been proposed over the centuries. In January 2014, spectrography data that were captured by chance (discussed below) lent support to the vaporized silicon hypothesis. Scientific data on natural ball lightning are scarce, owing to its infrequency and unpredictability. Historical accounts[edit] In a 1960 study, 5% of the population of the Earth reported having witnessed ball lightning.[7][8] Another study analyzed reports of 10,000 cases.[7][9] Wells, Somerset[edit] R.C.
The New Wizard of the West An interview with Tesla, the Modern Miracle-Worker, who is Harnessing the Rays of the Sun; has Discovered Ways of Transmitting Power without Wires and of Seeing by Telephone; has Invented a Means of Employing Electricity as a Fertiliser; and, Finally, is Able to Manufacture Artificial Daylight. From Pearson's Magazine, May 1899 Index to Illustrations [Tesla's proposed arrangement of balloon stations for transmitting electricity without wires.] NOT to stagger on being shown through the laboratory of Nikola Tesla requires the possession of an uncommonly sturdy mind. Fancy yourself seated in a large, well- lighted room, with mountains of curious-looking machinery on all sides. The odd flame having been extinguished as miraculously as it appeared, the tall, thin young man next signals to his assistants to close up all the windows. Scarcely have you begun to marvel when the light goes out by a touch on a button by the young man's hand. [Nikola Tesla holding in his hands balls of flame.]
Tesla reported in 1904 in the journal Electrical