{"id":106235,"date":"2011-11-01T00:00:00","date_gmt":"2011-11-01T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/study-of-jet-fires-geometry-and-radiative-features\/"},"modified":"2011-11-01T00:00:00","modified_gmt":"2011-11-01T00:00:00","slug":"study-of-jet-fires-geometry-and-radiative-features","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/procesos-quimicos\/study-of-jet-fires-geometry-and-radiative-features\/","title":{"rendered":"Study of jet fires geometry and radiative features"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Adriana Palacios Rosas <\/strong><\/h2>\n<p>Among the major accidents that can occur in processing plants or in the transportation of hazardous  materials, jet fires are of particular interest. Although they have a relatively shorter distance of  influence than other major accidents, they are characterized by high heat fluxes and if there is flame  impingement they can originate a domino effect, leading to a subsequent explosion, large fire, or other  events with severe effects. Several experimental and theoretical studies have been carried out;  however, most of those works have been focused on small-scale jet fires, subsonic flames or flares,  the conditions of which significantly differ from those found in real accidental jet fires, usually reaching  larger flame lengths and sonic exit velocities. This lack of research is the reason to explain why the  current knowledge of jet fires was still rather poor and the accurate prediction of their effects and  consequences was still a problem. The present thesis has been addressed to produce a significant  amount of novel and useful information on jet fires, by improving understanding of jet fire structure,  reach and radiative features, through analyses, experiment and mathematical modelling. This study  has been focused on both existing and also new experimental jet flame data, comprising all together,  turbulent non-premixed jet flames vertically and horizontally released into still air, involving several  fuels (hydrogen, methane and propane), over a wide  range of operational conditions (jet exit  velocities, release pressures and pipe diameters). The experimental study developed in this thesis has  concerned relatively large jet fires with flames of up to 10.3 m in length and 1.5 m in width. The fuel  was propane, and both sonic and subsonic jet exit velocities were obtained from different outlet  diameters. The jet fires were filmed with two videocameras registering visible light (vhs) and a  thermographic camera (ir). The main geometrical features of the flames were analyzed as a function  of the fuel velocity, mass flow rate and jet outlet diameter: jet flame size and flame shape. The  treatment of infrared images and measurements obtained from three heat flow sensors located at  different distances from the jet fire outlet also led the main radiative features of jet fires to be obtained:  incident thermal radiation heat over a target, surface emissive power and emissivity of the flames.  expressions for estimating jet flame reach as a function of several variables (mass flow rate, orifice  exit diameter, froude and reynolds numbers) have also been proposed. The results and the  expressions obtained in this study contribute to a  better understanding of jet fires for accurate risk  assessment, allowing the obtention of important advances in risk assessment methodologies and the  establishment of new measures, regulations, and risk planning policies for the prevention and\/or  control of this type of major fire, occurred world-wide in industrial establishments and in the  transportation of hazardous materials.<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Study of jet fires geometry and radiative features<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Study of jet fires geometry and radiative features <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Adriana Palacios Rosas <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de catalunya<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 11\/01\/2011<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Joaquim Casal F\u00c1\u00a0brega<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: j. angel Irabien gulias <\/li>\n<li>valerio Cozzani (vocal)<\/li>\n<li>micaela Demichela (vocal)<\/li>\n<li>Miguel angel Mu\u00f1oz messineo (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Adriana Palacios Rosas Among the major accidents that can occur in processing plants or in the transportation [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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