{"id":1058,"date":"2019-10-23T16:03:13","date_gmt":"2019-10-23T19:03:13","guid":{"rendered":"https:\/\/www.ufrgs.br\/ppgeq\/?p=1058"},"modified":"2019-10-26T00:03:47","modified_gmt":"2019-10-26T03:03:47","slug":"convite-para-a-defesa-de-dissertacao-de-paulo-henrique-konat-gandolfi","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/ppgeq\/2019\/10\/23\/convite-para-a-defesa-de-dissertacao-de-paulo-henrique-konat-gandolfi\/","title":{"rendered":"Convite para a defesa de disserta\u00e7\u00e3o de PAULO HENRIQUE KONAT GANDOLFI"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"1058\" class=\"elementor elementor-1058\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-633a2f2e elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"633a2f2e\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-443102ca\" data-id=\"443102ca\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-39010a92 elementor-widget elementor-widget-text-editor\" data-id=\"39010a92\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>O Programa de P\u00f3s-Gradua\u00e7\u00e3o em Engenharia Qu\u00edmica da Universidade Federal do Rio Grande do Sul tem a satisfa\u00e7\u00e3o de convidar a Comunidade Universit\u00e1ria para assistir a defesa p\u00fablica da disserta\u00e7\u00e3o de mestrado do Engenheiro Qu\u00edmico <strong>PAULO HENRIQUE KONAT GANDOLFI<\/strong>\u00a0a realizar-se:<\/p><ul><li>Data: 25 de outubro de 2019 \u2013 sexta-feira<\/li><li>Hor\u00e1rio: 13h30min.<\/li><li>Local: Sala 222 (Sala de Reuni\u00f5es) \u2013 2\u00ba andar \u2013 Pr\u00e9dio 12.105 \u2013 Anexo III da Reitoria \u2013 Campus Centro\/UFRGS<\/li><\/ul><h2>T\u00cdTULO<\/h2><p><em>&#8220;ESTRAT\u00c9GIAS DE MODELAGEM DE TURBUL\u00caNCIA PARA SIMULA\u00c7\u00d5ES DE COLUNAS DE BOLHAS&#8221;<\/em><\/p><h2>BANCA<\/h2><ul><li>Prof. Evandro Steffani \u2013 DEQUI\/UFRGS<\/li><li>Prof\u00aa Ligia Damasceno Ferreira Marczak \u2013 DEQUI\/UFRGS<\/li><li>Prof\u00aa Rejane de C\u00e9saro Oliveski \u2013 UNISINOS<\/li><\/ul><h2>ORIENTADOR<\/h2><ul><li>Prof. Nilo S\u00e9rgio Medeiros Cardozo \u2013 DEQUI\/UFRGS<\/li><\/ul><h2>RESUMO<\/h2><p>Colunas\u00a0de\u00a0bolhas comp\u00f5em\u00a0uma\u00a0vasta gama\u00a0de processos industriais,\u00a0como\u00a0reatores de polimeriza\u00e7\u00e3o, biorreatores para\u00a0tratamentos\u00a0de fluentes\u00a0e opera\u00e7\u00f5es\u00a0presentes na\u00a0ind\u00fastria\u00a0do\u00a0petr\u00f3leo.\u00a0Seu\u00a0desempenho \u00e9\u00a0fortemente dependente das caracter\u00edsticas fluidodin\u00e2micas no\u00a0seu\u00a0interior,\u00a0pois par\u00e2metros\u00a0chave como\u00a0taxas de\u00a0rea\u00e7\u00e3o s\u00e3o\u00a0bastante\u00a0afetadas\u00a0pela\u00a0adequada\u00a0dispers\u00e3o\u00a0e\u00a0mistura de reagentes.\u00a0Contudo, a\u00a0natureza do\u00a0escoamento\u00a0no interior\u00a0deste\u00a0tipo de dispositivo\u00a0\u00e9\u00a0bastante\u00a0complexa visto\u00a0que\u00a0h\u00e1 a\u00a0presen\u00e7a de duas fases,\u00a0sendo\u00a0uma delas cont\u00ednua (liquida)\u00a0e\u00a0outra dispersa\u00a0(g\u00e1s).\u00a0Para auxiliar na\u00a0compreens\u00e3o\u00a0deste\u00a0estudo, ferramentas\u00a0de fluidodin\u00e2mica\u00a0computacional\u00a0foram utilizadas\u00a0para\u00a0esta an\u00e1lise.\u00a0Um dos pontos de\u00a0grande\u00a0import\u00e2ncia para a\u00a0correta\u00a0predi\u00e7\u00e3o dos resultados\u00a0\u00e9 em\u00a0rela\u00e7\u00e3o\u00a0\u00e0 correta\u00a0representa\u00e7\u00e3o dos fen\u00f4menos\u00a0que ocorrem\u00a0nas\u00a0colunas\u00a0de bolhas. Dentre os fen\u00f4menos,\u00a0\u00e9\u00a0poss\u00edvel\u00a0elencar\u00a0os\u00a0efeitos\u00a0da turbul\u00eancia como um dos\u00a0mais\u00a0importantes dentro deste\u00a0vi\u00e9s.\u00a0A\u00a0literatura\u00a0explora\u00a0bastante os diversos modelos\u00a0existentes em rela\u00e7\u00e3o\u00a0\u00e0s\u00a0colunas\u00a0de bolhas para uma\u00a0vasta gama\u00a0de\u00a0configura\u00e7\u00f5es geom\u00e9tricas e operacionais\u00a0do\u00a0equipamento.\u00a0Tanto os modelos de turbul\u00eancia da classe\u00a0RANS,\u00a0como\u00a0k-E\u00a0e\u00a0k-ro,\u00a0e\u00a0modelos da classe RSM tiveram\u00a0suas\u00a0performances\u00a0avaliadas frente\u00a0a\u00a0estrat\u00e9gias\u00a0de\u00a0modelagem\u00a0mais robustas,\u00a0como LES,\u00a0no\u00a0que\u00a0se\u00a0trata da representa\u00e7\u00e3o matem\u00e1tica de\u00a0colunas\u00a0de bolhas.\u00a0Entretanto,\u00a0no que\u00a0se\u00a0trata da abordagem LES,\u00a0pouca\u00a0aten\u00e7\u00e3o foi dada\u00a0na literatura\u00a0em\u00a0rela\u00e7\u00e3o\u00a0aos crit\u00e9rios\u00a0de\u00a0qualidade\u00a0de malha\u00a0e tamb\u00e9m\u00a0da\u00a0correta\u00a0discretiza\u00e7\u00e3o da regi\u00e3o que\u00a0comp\u00f5e a camada\u00a0limite,\u00a0fatores que\u00a0s\u00e3o\u00a0bastante cr\u00edticos\u00a0na\u00a0aquisi\u00e7\u00e3o de dados\u00a0para LES.\u00a0O modelo\u00a0Smagorinsky n\u00e3o\u00a0possui\u00a0capacidade\u00a0para\u00a0representar\u00a0bem o\u00a0escoamento\u00a0pr\u00f3ximo \u00e0 parede,\u00a0sendo\u00a0necess\u00e1rio\u00a0resolver esta zona,\u00a0por exemplo.\u00a0No\u00a0que\u00a0tange\u00a0os modelos da classe RANS,\u00a0pouca aten\u00e7\u00e3o foi dada\u00a0aos\u00a0modelos de parede\u00a0existentes. Sendo assim,\u00a0o\u00a0objetivo\u00a0deste\u00a0trabalho\u00a0foi preencher\u00a0as\u00a0lacunas\u00a0existentes a\u00a0respeito da modelagem de turbul\u00eancia\u00a0em\u00a0colunas de bolhas\u00a0atrav\u00e9s\u00a0do OpenFOAM,\u00a0um pacote\u00a0open source\u00a0de\u00a0CFD escrito em C++.\u00a0Para isso,\u00a0utilizou-se um sistema experimental\u00a0dispon\u00edvel\u00a0cujos\u00a0dados\u00a0est\u00e3o\u00a0dispon\u00edveis na literatura\u00a0e\u00a0bastante\u00a0estudado\u00a0para\u00a0a valida\u00e7\u00e3o\u00a0de\u00a0c\u00f3digos.\u00a0As\u00a0equa\u00e7\u00f5es governantes\u00a0utilizadas empregaram\u00a0a descri\u00e7\u00e3o\u00a0Euleriana\u00a0para o\u00a0sistema\u00a0multif\u00e1sico. Foram\u00a0geradas diversas\u00a0malhas\u00a0com\u00a0o intuito de\u00a0atender aos crit\u00e9rios\u00a0de qualidade impostos para LES\u00a0com\u00a0rela\u00e7\u00e3o \u00e0 discretiza\u00e7\u00e3o\u00a0adequada e a\u00a0correta representa\u00e7\u00e3o da regi\u00e3o pr\u00f3xima \u00e0 parede.\u00a0A\u00a0partir da\u00a0an\u00e1lise\u00a0de\u00a0vari\u00e1veis chave como a fra\u00e7\u00e3o\u00a0de\u00a0g\u00e1s e\u00a0a tens\u00e3o de cisalhamento nas paredes,\u00a0foi poss\u00edvel\u00a0atender\u00a0aos\u00a0crit\u00e9rios\u00a0de malha\u00a0exigidos\u00a0para\u00a0malha. De posse destes dados, foi\u00a0realizada\u00a0a compara\u00e7\u00e3o\u00a0frente aos modelos\u00a0k-E,\u00a0com\u00a0duas fun\u00e7\u00f5es de parede diferentes para\u00a0alto\u00a0e baixo Reynolds,\u00a0e\u00a0k-ro\u00a0SST.\u00a0Foi\u00a0observado que todos\u00a0os\u00a0modelos\u00a0representaram\u00a0bem os dados\u00a0experimentais\u00a0para a\u00a0velocidade\u00a0de\u00a0l\u00edquido,\u00a0tirando\u00a0o modelo k-w\u00a0SST.\u00a0Quanto\u00a0ao\u00a0modelo\u00a0k-E,\u00a0observou-se que\u00a0as\u00a0fun\u00e7\u00f5es de parede afetaram\u00a0as\u00a0predi\u00e7\u00f5es de\u00a0bacliflow\u00a0na proximidade da\u00a0superficie. A estrat\u00e9gia LES\u00a0mostrou-se\u00a0eficiente em representar\u00a0perturba\u00e7\u00f5es\u00a0locais\u00a0do\u00a0escoamento.\u00a0J\u00e1\u00a0em rela\u00e7\u00e3o aos\u00a0dados relativos\u00a0\u00e0 velocidade\u00a0de\u00a0g\u00e1s,\u00a0nota-se\u00a0que\u00a0todos\u00a0os modelos\u00a0apres\u00b7entaram\u00a0resultados distantes.\u00a0Contudo,\u00a0apenas a\u00a0estrat\u00e9gia\u00a0LES foi coerente em rela\u00e7\u00e3o\u00a0ao\u00a0perfil de\u00a0velocidades. Com rela\u00e7\u00e3o \u00e0s tens\u00f5es\u00a0de\u00a0cisalhamento, verificou-se\u00a0que\u00a0os\u00a0modelos RANS distanciaram-se muito dos valores preditos por LES.<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"O Programa de P\u00f3s-Gradua\u00e7\u00e3o em Engenharia Qu\u00edmica da Universidade Federal do Rio Grande do Sul tem a satisfa\u00e7\u00e3o de convidar a Comunidade Universit\u00e1ria \n<a class=\"moretag\" href=\"https:\/\/www.ufrgs.br\/ppgeq\/2019\/10\/23\/convite-para-a-defesa-de-dissertacao-de-paulo-henrique-konat-gandolfi\/\"> <br \/><\/a>","protected":false},"author":6,"featured_media":432,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26,31],"tags":[],"class_list":["post-1058","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-defesas-mestrado","category-noticias-arquivadas"],"publishpress_future_workflow_manual_trigger":{"enabledWorkflows":[]},"_links":{"self":[{"href":"https:\/\/www.ufrgs.br\/ppgeq\/wp-json\/wp\/v2\/posts\/1058","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ufrgs.br\/ppgeq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ufrgs.br\/ppgeq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgeq\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgeq\/wp-json\/wp\/v2\/comments?post=1058"}],"version-history":[{"count":4,"href":"https:\/\/www.ufrgs.br\/ppgeq\/wp-json\/wp\/v2\/posts\/1058\/revisions"}],"predecessor-version":[{"id":1062,"href":"https:\/\/www.ufrgs.br\/ppgeq\/wp-json\/wp\/v2\/posts\/1058\/revisions\/1062"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgeq\/wp-json\/wp\/v2\/media\/432"}],"wp:attachment":[{"href":"https:\/\/www.ufrgs.br\/ppgeq\/wp-json\/wp\/v2\/media?parent=1058"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgeq\/wp-json\/wp\/v2\/categories?post=1058"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ufrgs.br\/ppgeq\/wp-json\/wp\/v2\/tags?post=1058"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}