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Bibliographic Details
Main Author:	Alberto Osorio
Format:	Artículo científico
Language:	es
Published:	Universidad de Pamplona 2009
Subjects:	Química PMT FFT Velocidad de un Fluido Franjas de Interferencia Anemometría Láser Doppler
Online Access:	https://www.redalyc.org/articulo.oa?id=90312180004
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Determinación del Gradiente de Velocidad en un Flujo Real por Medio de Técnicas Unidimensionales de Anemometría Láser Doppler Alberto Osorio Efraín Solarte Química PMT FFT Velocidad de un Fluido Franjas de Interferencia Anemometría Láser Doppler Los sistemas ópticos de anemometría Láser Doppler (LDA: Laser Doppler Anemometry)constituyen una alternativa no invasiva y de alta resolución para determinar la dinámica de fluidos. Estos sistemas permiten diseños que difícilmente pueden ser superados por otros anemómetros. Su principio de funcionamiento se basa en la detección de los cambios en la frecuencia de la luz esparcida, efecto Doppler, por las partículas del fluido iluminadas por una fuente de luz coherente. Los corrimientos de frecuencia son proporcionales a la velocidad de las partículas o del fluido, si se consideran partículas dispersoras de baja densidad y no son afectados por parámetros externos al fluido como la presión o la temperatura. En este trabajo, se presentan las medidas de los cambios en la frecuencia Doppler, entregadas por un sistema LDA unidimensional. Estos datos permitieron calcular las diferentes velocidades del líquido, a lo largo de la sección trasversal de un tubo circular, hallándose un aumento progresivo desde 0.05 cm.s-1, para posiciones cercanas a las paredes del tubo, hasta valores de 0.30 cm/s, para la posición central. Con estos datos se obtuvo un perfil o gradiente de velocidad parabólico, finalmente se muestra la dinámica del flujo real utilizado, forzado por acción gravitatoria. 2009 artículo científico 0120-4211 https://www.redalyc.org/articulo.oa?id=90312180004 es http://www.redalyc.org/revista.oa?id=903 Bistua: Revista de la Facultad de Ciencias Básicas application/pdf Universidad de Pamplona Bistua: Revista de la Facultad de Ciencias Básicas (Colombia) Num.2 Vol.7

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// Anecdotal testing Today and Yesterday seems to indicate destroy() // is called by the garbage collector and everything is good. // Something to keep in mind though. return 0; } /** * Write function that is called when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ public function write($sessId, $data): bool { if ($this->writesDisabled) { return true; } return $this->saveSession($sessId, $data); } /** * A function that is called internally when session data is to be saved. * * @param string $sessId The current session ID * @param string $data The session data to write * * @return bool */ abstract protected function saveSession($sessId, $data): bool; }

* * @return void */ public function writeClose() { // The assumption is that we're using PHP's ext/session. // session_write_close() will actually overwrite $_SESSION with an // empty array on completion -- which leads to a mismatch between what // is in the storage object and $_SESSION. To get around this, we // temporarily reset $_SESSION to an array, and then re-link it to // the storage object. // // Additionally, while you _can_ write to $_SESSION following a // session_write_close() operation, no changes made to it will be // flushed to the session handler. As such, we now mark the storage // object isImmutable. $storage = $this->getStorage(); if (! $storage->isImmutable()) { $_SESSION = $storage->toArray(true); session_write_close(); $storage->fromArray($_SESSION); $storage->markImmutable(); } } /** * Attempt to set the session name * * If the session has already been started, or if the name provided fails * validation, an exception will be raised. * * @param string $name * @return SessionManager * @throws Exception\InvalidArgumentException */ public function setName($name) { if ($this->sessionExists()) { throw new Exception\InvalidArgumentException( 'Cannot set session name after a session has already started'

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