{"id":1851,"date":"2022-04-26T20:23:31","date_gmt":"2022-04-26T20:23:31","guid":{"rendered":"https:\/\/neu.striko.de\/encyclopedia\/reynolds-number\/"},"modified":"2022-04-26T20:23:31","modified_gmt":"2022-04-26T20:23:31","slug":"reynolds-number","status":"publish","type":"encyclopedia","link":"https:\/\/striko.de\/en\/encyclopedia\/reynolds-number\/","title":{"rendered":"Reynolds number"},"content":{"rendered":"<p>A dimensionless figure (symbol: Re) named after the physicist Osborne Reynolds. It is used in fluid mechanics and can be understood as the ratio between inertial and viscous forces. It has been shown that the turbulence characteristics of geometrically similar bodies are identical when the Reynolds number remains constant. This characteristic allows for instance realistic model tests in the wind and water channel.<\/p>\n<p>The Reynolds number is defined by Re = &rho; &sdot; v &sdot; d \/ &eta; = v &sdot; d \/ &nu;<\/p>\n<p>Where &rho; is the density of the liquid, v the flow velocity of the liquid with respect to the body and d the characteristic length of the body. The characteristic length, also known as reference length, is defined or must be defined for each problem. For flow bodies, the length of the body in the direction of the flow is usually chosen. The kinematic <a href=\"https:\/\/striko.de\/en\/encyclopedia\/viscosity\/\" target=\"_self\" title=\"The term viscosity relates back to the typically viscous juice from berries in the botanical systematics of mistletoes (viscum spp.) from which birdlime was gained. Viscosity is a physical value and gives information about the siziness of a liquid. Its reciprocal value is fluidity, measuring the flowability of a liquid. The larger the viscosity, the&hellip;\" class=\"encyclopedia\">viscosity<\/a> v of the liquid is differentiated from the dynamic <a href=\"https:\/\/striko.de\/en\/encyclopedia\/viscosity\/\" target=\"_self\" title=\"The term viscosity relates back to the typically viscous juice from berries in the botanical systematics of mistletoes (viscum spp.) from which birdlime was gained. Viscosity is a physical value and gives information about the siziness of a liquid. Its reciprocal value is fluidity, measuring the flowability of a liquid. The larger the viscosity, the&hellip;\" class=\"encyclopedia\">viscosity<\/a> &eta; = &nu; &sdot; &rho; by the factor &rho;.<\/p>\n<p>If the Reynolds number exceeds a (problem-dependent) critical value Re crit, a so far <a href=\"https:\/\/striko.de\/en\/encyclopedia\/laminar-flow\/\" target=\"_self\" title=\"Laminar flow refers to a type of flow in which a fluid moves in orderly, parallel layers. There is only minimal mass transfer between the individual flow layers. In contrast to turbulent flow, no significant vortices occur. This flow condition is influenced, among other factors, by the Reynolds number, viscosity, flow velocity, and the geometry&hellip;\" class=\"encyclopedia\">laminar flow<\/a> becomes prone to even the smallest disturbances. In accordance, for Re &gt; Re crit, a change from laminar to turbulent flow must be calculated.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>A dimensionless figure (symbol: Re) named after the physicist Osborne Reynolds. It is used in fluid mechanics and can be understood as the ratio between inertial and viscous forces. It has been shown that the turbulence characteristics of geometrically similar bodies are identical when the Reynolds number remains constant. This characteristic allows for instance realistic model tests in the wind &#8230; <a href=\"https:\/\/striko.de\/en\/encyclopedia\/reynolds-number\/\" class=\"more-link\">Read More<\/a><\/p>\n","protected":false},"author":3,"template":"","meta":{"_acf_changed":false,"inline_featured_image":false},"encyclopedia-tag":[],"class_list":["post-1851","encyclopedia","type-encyclopedia","status-publish","hentry","no-post-thumbnail"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.0 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Reynolds number | STRIKO Verfahrenstechnik GmbH<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/striko.de\/en\/encyclopedia\/reynolds-number\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Reynolds number | STRIKO Verfahrenstechnik GmbH\" \/>\n<meta property=\"og:description\" content=\"A dimensionless figure (symbol: Re) named after the physicist Osborne Reynolds. 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