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Main Author:	José Carmen León Conejo
Format:	Artículo científico
Language:	es
Published:	Sociedad Mexicana de Ingeniería Mecánica 2007
Subjects:	Ingeniería flujo de calor efectos capilares número de Nusselt resistencia térmica Microcanal trapezoidal
Online Access:	https://www.redalyc.org/articulo.oa?id=76816765005
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Disipación de calor en microcanales de tipo trapezoidal con diferentes razones de aspecto José Carmen León Conejo Carlos Alberto Rubio Jiménez Abel Hernández Guerrero José Cuauhtémoc Rubio Arana Ingeniería flujo de calor efectos capilares número de Nusselt resistencia térmica Microcanal trapezoidal Este trabajo muestra un análisis numérico de disipadores de calor tipo microcanal con sección transversal trapezoidal sujeta a un flujo calor constante, disipación similar a la que se presenta en los dispositivos electrónicos de alto desempeño. Se realiza el análisis del efecto de la razón de aspecto entre la base mayor y la base menor de la sección transversal del canal, así comodel efecto de la razón de aspecto entre la base mayor y la altura del mismo. Agua como fluido de trabajo, entra al dispositivo por medio de un actuador de flujo, considerándose variables las propiedades térmicas del fluido de trabajo y del material base con respecto a la temperatura. También son despreciables los efectos capilares presentes en estos dispositivos. Los resultados muestran los perfiles de temperatura a lo largo del disipador de calor, así como la resistencia térmica en esta dirección, así como del número de Nusselt local respecto a la longitud del canal. El número de Nusselt es el parámetro más indicativo para definir el comportamiento térmico en la disipación de calor. 2007 artículo científico 1665-7381 https://www.redalyc.org/articulo.oa?id=76816765005 es http://www.redalyc.org/revista.oa?id=768 Ingeniería Mecánica. Tecnología y Desarrollo application/pdf Sociedad Mexicana de Ingeniería Mecánica Ingeniería Mecánica. Tecnología y Desarrollo (México) Num.5 Vol.2

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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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