{"id":48545,"date":"2019-11-11T02:11:54","date_gmt":"2019-11-11T01:11:54","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/o-que-e-controle-de-volume-analise-de-volume-de-controle-definicao\/"},"modified":"2020-01-29T13:41:58","modified_gmt":"2020-01-29T12:41:58","slug":"o-que-e-controle-de-volume-analise-de-volume-de-controle-definicao","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/pt-br\/o-que-e-controle-de-volume-analise-de-volume-de-controle-definicao\/","title":{"rendered":"O que \u00e9 controle de volume – An\u00e1lise de volume de controle – Defini\u00e7\u00e3o"},"content":{"rendered":"
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Um volume de controle \u00e9 uma regi\u00e3o fixa no espa\u00e7o escolhido para o estudo termodin\u00e2mico de balan\u00e7os de massa e energia para sistemas de fluxo.\u00a0O limite do volume de controle pode ser um envelope real ou imagin\u00e1rio.\u00a0Engenharia T\u00e9rmica<\/div>\n<\/div>\n
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Controle de volume – An\u00e1lise de volume de controle<\/h2>\n

\"Conserva\u00e7\u00e3o<\/a>Um\u00a0volume de controle<\/strong>\u00a0\u00e9 uma regi\u00e3o fixa no espa\u00e7o escolhido para o estudo termodin\u00e2mico de balan\u00e7os de massa e energia para sistemas de fluxo.\u00a0O limite do\u00a0volume de controle<\/strong>\u00a0pode ser um\u00a0envelope<\/strong>\u00a0real ou imagin\u00e1rio\u00a0.\u00a0A superf\u00edcie de controle \u00e9 o limite do volume de controle.<\/p>\n

Uma an\u00e1lise de volume de controle pode ser usada, por exemplo, para determinar a taxa de mudan\u00e7a de momento de um fluido.\u00a0Nesta an\u00e1lise, consideraremos um tubo de\u00a0fluxo<\/strong>\u00a0(\u00a0volume de controle<\/strong>\u00a0) como fizemos para a\u00a0equa\u00e7\u00e3o de Bernoulli<\/a>\u00a0.\u00a0Neste\u00a0volume de controle,<\/strong>\u00a0qualquer altera\u00e7\u00e3o no momento do fluido dentro de um volume de controle \u00e9 devida \u00e0 a\u00e7\u00e3o de for\u00e7as externas no fluido dentro do volume.<\/p>\n

Veja tamb\u00e9m:\u00a0F\u00f3rmula Momentum<\/a><\/p>\n

Como pode ser visto na figura, o\u00a0m\u00e9todo do volume de controle<\/strong>\u00a0pode ser usado para analisar a lei de conserva\u00e7\u00e3o do momento no fluido.\u00a0O volume de controle<\/strong>\u00a0\u00e9 uma\u00a0superf\u00edcie imagin\u00e1ria que<\/strong>\u00a0encerra um volume de interesse.\u00a0O volume de controle pode ser fixo ou m\u00f3vel, e pode ser r\u00edgido ou deform\u00e1vel.\u00a0Para determinar todas as for\u00e7as que atuam nas superf\u00edcies do volume de controle, temos que resolver as leis de conserva\u00e7\u00e3o nesse volume de controle.<\/p>\n

Escolhendo um volume de controle<\/h2>\n

Um volume de controle pode ser selecionado como qualquer volume arbitr\u00e1rio atrav\u00e9s do qual o fluido flui.\u00a0Esse volume pode ser est\u00e1tico, em movimento e at\u00e9 deformar durante o fluxo.\u00a0Para resolver qualquer problema, precisamos resolver as\u00a0leis<\/a>\u00a0b\u00e1sicas de\u00a0conserva\u00e7\u00e3o<\/a>\u00a0neste volume.\u00a0\u00c9 muito importante conhecer todas as velocidades de fluxo relativas \u00e0 superf\u00edcie de controle e, portanto, \u00e9 muito importante definir exatamente os limites do volume de controle durante uma an\u00e1lise.<\/p>\n<\/div>\n<\/div>\n

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Exemplo: jato de \u00e1gua atingindo uma placa estacion\u00e1ria<\/h2>\n

\"Equa\u00e7\u00e3o<\/a><\/strong><\/p>\n

Uma placa estacion\u00e1ria<\/span><\/strong>\u00a0\u00a0(por exemplo, l\u00e2mina de um moinho de \u00e1gua) \u00e9 usada para desviar o fluxo de \u00e1gua a uma velocidade de\u00a0\u00a0<\/span>1 m \/ se<\/span><\/strong>\u00a0\u00a0a um \u00e2ngulo de\u00a0\u00a0<\/span>90 \u00b0<\/span><\/strong>\u00a0.\u00a0Ocorre \u00e0 press\u00e3o atmosf\u00e9rica e a vaz\u00e3o m\u00e1ssica \u00e9 igual a\u00a0\u00a0<\/span>Q = 1 m\u00a0<\/span>3<\/span><\/sup>\u00a0\/ s<\/span><\/strong>\u00a0.<\/span><\/p>\n

    \n
  1. Calcule a for\u00e7a da press\u00e3o.<\/span><\/strong><\/li>\n
  2. Calcule a for\u00e7a do corpo.<\/span><\/strong><\/li>\n
  3. Calcule a for\u00e7a total.<\/span><\/strong><\/li>\n
  4. Calcule a for\u00e7a resultante.<\/span><\/strong><\/li>\n<\/ol>\n

    Solu\u00e7\u00e3o<\/span><\/strong><\/p>\n

      \n
    1. A\u00a0\u00a0<\/span>for\u00e7a da press\u00e3o<\/span><\/strong>\u00a0\u00a0\u00e9 zero, pois a press\u00e3o na entrada e nas sa\u00eddas do volume de controle \u00e9 atmosf\u00e9rica.<\/span><\/li>\n
    2. Como o volume de controle \u00e9 pequeno, podemos ignorar a\u00a0<\/span>for\u00e7a<\/span><\/strong>\u00a0do\u00a0\u00a0corpo<\/strong>\u00a0\u00a0devido ao peso da gravidade.<\/span><\/li>\n
    3. F\u00a0<\/span>x<\/span><\/sub><\/strong>\u00a0\u00a0= \u03c1.Q. (w\u00a0<\/span>1x<\/span><\/sub>\u00a0\u00a0– w\u00a0<\/span>2x<\/span><\/sub>\u00a0) = 1000.\u00a01\u00a0(1 – 0) =\u00a0\u00a0<\/span>1000 N<\/span><\/strong>
      \nF\u00a0<\/span>y<\/span><\/sub><\/strong>\u00a0\u00a0=\u00a0\u00a0<\/span>0<\/span><\/strong>
      \nF<\/span><\/strong>\u00a0\u00a0=\u00a0\u00a0<\/span>(1000, 0)<\/span><\/strong><\/li>\n
    4. A\u00a0\u00a0<\/span>for\u00e7a resultante<\/span><\/strong>\u00a0\u00a0no plano \u00e9 da mesma magnitude, mas na dire\u00e7\u00e3o oposta \u00e0 for\u00e7a total\u00a0\u00a0<\/span>F<\/span><\/strong>\u00a0\u00a0(atrito e peso s\u00e3o negligenciados).<\/span><\/li>\n<\/ol>\n

      O jato de \u00e1gua exerce sobre a placa a for\u00e7a de\u00a0<\/span>1000 N<\/span><\/strong>\u00a0na dire\u00e7\u00e3o x.<\/span><\/p>\n

      \u00a0<\/strong><\/p>\n<\/div>\n

      ……………………………………………………………………………………………………………………………….<\/p>\n

      Este artigo \u00e9 baseado na tradu\u00e7\u00e3o autom\u00e1tica do artigo original em ingl\u00eas. Para mais informa\u00e7\u00f5es, consulte o artigo em ingl\u00eas. Voc\u00ea pode nos ajudar. Se voc\u00ea deseja corrigir a tradu\u00e7\u00e3o, envie-a para: translations@nuclear-power.com ou preencha o formul\u00e1rio de tradu\u00e7\u00e3o on-line. Agradecemos sua ajuda, atualizaremos a tradu\u00e7\u00e3o o mais r\u00e1pido poss\u00edvel. Obrigado.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

      Um volume de controle \u00e9 uma regi\u00e3o fixa no espa\u00e7o escolhido para o estudo termodin\u00e2mico de balan\u00e7os de massa e energia para sistemas de fluxo.\u00a0O limite do volume de controle pode ser um envelope real ou imagin\u00e1rio.\u00a0Engenharia T\u00e9rmica Controle de volume – An\u00e1lise de volume de controle Um\u00a0volume de controle\u00a0\u00e9 uma regi\u00e3o fixa no espa\u00e7o … Ler mais<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[14],"tags":[],"yoast_head":"\nO que \u00e9 controle de volume - An\u00e1lise de volume de controle - Defini\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Um volume de controle \u00e9 uma regi\u00e3o fixa no espa\u00e7o escolhido para o estudo termodin\u00e2mico de balan\u00e7os de massa e energia para sistemas de fluxo. 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