{"id":51784,"date":"2023-02-08T15:11:39","date_gmt":"2023-02-08T18:11:39","guid":{"rendered":"https:\/\/www.ufrgs.br\/amlef\/?p=51784"},"modified":"2023-03-22T16:34:47","modified_gmt":"2023-03-22T19:34:47","slug":"movimento-hidrodinamica-algumas-aplicacoes","status":"publish","type":"post","link":"https:\/\/www.ufrgs.br\/amlef\/2023\/02\/08\/movimento-hidrodinamica-algumas-aplicacoes\/","title":{"rendered":"Movimento: Hidrodin\u00e2mica \u2014 algumas aplica\u00e7\u00f5es"},"content":{"rendered":"\n<p class=\"has-text-align-justify wp-block-paragraph\">Final\u00admente che\u00adga\u00admos na hidro\u00addi\u00adn\u00e2\u00admica, ou seja, fluidos em movi\u00admento. Mas esse \u00e9 um tema BASTANTE com\u00adpli\u00adcado e antes, pre\u00adci\u00adsa\u00admos assumir certas con\u00addi\u00ad\u00e7\u00f5es para o fluido que estamos ana\u00adli\u00adsando: ele deve ser um \u201cfluido ideal\u201d. Ele deve ter esco\u00ada\u00admento laminar (seu padr\u00e3o de velo\u00adci\u00adda\u00addes deve per\u00adma\u00adne\u00adcer cons\u00adtante com o passar do tempo), ele deve ser incom\u00adpres\u00ads\u00ed\u00advel (sua den\u00adsi\u00addade \u00e9 a mesma em qual\u00adquer um de seus pontos), seu esco\u00ada\u00admento n\u00e3o \u00e9 viscoso (ou seja, n\u00e3o resiste ao esco\u00ada\u00admento, n\u00e3o gruda nas coisas e \u201cn\u00e3o molha\u201d) e seu esco\u00ada\u00admento deve ser irro\u00adta\u00adci\u00ado\u00adnal (ou seja, n\u00e3o h\u00e1 giro ao redor do centro de massa das par\u00adt\u00ed\u00adcu\u00adlas com\u00adpo\u00adnen\u00adtes do fluido). Dito isso, ini\u00adci\u00ada\u00adre\u00admos nossa aven\u00adtura&nbsp;final.<\/p>\n\n\n\n<div style=\"height:0px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">Conserva\u00e7\u00e3o de Volume aplicada ao&nbsp;MAL<\/h2>\n\n\n\n<figure class=\"wp-block-image alignright size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2023\/01\/762px-Fluid-dynamics-continuity-equation.svg_-2.png\" alt class=\"wp-image-51799\" width=\"421\" height=\"157\" srcset=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2023\/01\/762px-Fluid-dynamics-continuity-equation.svg_-2.png 762w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2023\/01\/762px-Fluid-dynamics-continuity-equation.svg_-2-300x112.png 300w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2023\/01\/762px-Fluid-dynamics-continuity-equation.svg_-2-205x77.png 205w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2023\/01\/762px-Fluid-dynamics-continuity-equation.svg_-2-480x180.png 480w\" sizes=\"auto, (max-width: 421px) 100vw, 421px\"><figcaption class=\"wp-element-caption\">Figura 1. Repre\u00adsen\u00adta\u00ad\u00e7\u00e3o da equa\u00e7\u00e3o da con\u00adti\u00adnui\u00addade. Fonte: MikeRun, <a rel=\"noreferrer noopener\" href=\"https:\/\/creativecommons.org\/licenses\/by-sa\/4.0\" target=\"_blank\">CC BY-SA 4.0<\/a>, via <a rel=\"noreferrer noopener\" href=\"https:\/\/commons.wikimedia.org\/wiki\/Main_Page\" target=\"_blank\">Wiki\u00adme\u00addia Commons<\/a>.<\/figcaption><\/figure>\n\n\n\n<p class=\"has-text-align-justify wp-block-paragraph\">Suponha que voc\u00ea e um amigo est\u00e3o cui\u00addando de seu jardim. Voc\u00ea est\u00e1 encar\u00adre\u00adgado de regar as plantas com man\u00adgueira, enquanto seu amigo realiza as podas. Em um deter\u00admi\u00adnado ins\u00adtante, devido a um \u00edmpeto de mau-cara\u00adtismo e per\u00adver\u00adsi\u00addade acima da m\u00e9dia, voc\u00ea decide molhar seu amigo com a man\u00adgueira que deveria regar o jardim. A fim de p\u00f4r em pr\u00e1tica seu infa\u00adl\u00ed\u00advel plano mal\u00e9\u00adfico digno de uma his\u00adt\u00f3\u00adria em qua\u00addri\u00adnhos infan\u00adtil, voc\u00ea tampa uma parte do bico da man\u00adgueira com seu dedo, fazendo com que a \u00e1gua que sai da man\u00adgueira ganhe mais velo\u00adci\u00addade e atinja em cheio seu ino\u00adcente amigo. Brin\u00adca\u00addei\u00adras \u00e0 parte, qual seria a expli\u00adca\u00ad\u00e7\u00e3o f\u00edsica para esse c\u00f4mico e correto, por\u00e9m errado, fen\u00f4\u00admeno? O que foi visto aqui, foi uma apli\u00adca\u00ad\u00e7\u00e3o pr\u00e1tica da Equa\u00e7\u00e3o da Con\u00adti\u00adnui\u00addade (1), mas essa exige um pouco de conhe\u00adci\u00admento pr\u00e9vio.<\/p>\n\n\n<p style=\"text-align: center;\"><img decoding=\"async\" src=\"https:\/\/latex.codecogs.com\/gif.latex?\\overrightarrow{\\nabla}\\cdot&amp;space;\\overrightarrow{J}=-\\frac{\\partial&amp;space;\\rho}{\\partial&amp;space;t}\\;,&amp;space;\\;&amp;space;\\;&amp;space;(1)\" alt=\"\\overrightarrow{\\nabla}\\cdot \\overrightarrow{J}=-\\frac{\\partial \\rho}{\\partial t}\\;, \\; \\; (1)\" align=\"absmiddle\"><\/p>\n<p>No caso espe\u00adc\u00ed\u00adfico de um fluido ideal, a equa\u00e7\u00e3o se reduz \u00e0 Con\u00adser\u00adva\u00ad\u00e7\u00e3o de Volume (2), a qual demons\u00adtra que a velo\u00adci\u00addade de um fluido \u00e9 inver\u00adsa\u00admente pro\u00adpor\u00adci\u00ado\u00adnal a \u00e1rea da sec\u00e7\u00e3o trans\u00adver\u00adsal de um tubo no qual um fluido escoa. Logo, ao tapar\u00admos uma parcela do bico da man\u00adgueira, esta\u00adre\u00admos dimi\u00adnuindo sua \u00e1rea, a qual ser\u00e1 menor que as sec\u00e7\u00f5es trans\u00adver\u00adsais ao longo da man\u00adgueira, o que acar\u00adre\u00adtar\u00e1 na emiss\u00e3o de \u00e1gua com maior velocidade.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/latex.codecogs.com\/gif.latex?v\\cdot&amp;space;A=cte&amp;space;\\:&amp;space;\\therefore&amp;space;\\:&amp;space;v&amp;space;\\propto&amp;space;\\frac{1}{A}\\;&amp;space;,\\;&amp;space;\\;&amp;space;(2)\" alt=\"v\\cdot A=cte \\: \\therefore \\: v \\propto \\frac{1}{A}\\; ,\\; \\; (2)\" align=\"absmiddle\"><\/p>\n\n\n<div style=\"height:0px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">E o que isso tudo tem a ver com os avi\u00f5es?<\/h2>\n\n\n<p>Por \u00faltimo, imagine agora que deter\u00admi\u00adnado fluido escoa em um tubo com uma certa dife\u00adren\u00e7a de altura entre suas extre\u00admi\u00adda\u00addes, como na figura 2. Ao escoar, o fluido ir\u00e1 adqui\u00adrir energia cin\u00e9\u00adtica e poten\u00adcial; logo, pelo Teorema Tra\u00adba\u00adlho-Energia obtemos a seguinte equa\u00e7\u00e3o:<img decoding=\"async\" class=\"aligncenter\" src=\"https:\/\/latex.codecogs.com\/gif.latex?P_1+\\frac{1}{2}\\rho_1v_1^2+\\rho_1gh_1&amp;space;=&amp;space;P_2+\\frac{1}{2}\\rho_2v_2^2+\\rho_2gh_2\\:&amp;space;,\" alt=\"P_1+\\frac{1}{2}\\rho_1v_1^2+\\rho_1gh_1 = P_2+\\frac{1}{2}\\rho_2v_2^2+\\rho_2gh_2\\: ,\" align=\"absmiddle\"><span style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\">onde <\/span><img decoding=\"async\" style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\" src=\"https:\/\/latex.codecogs.com\/gif.latex?\\inline&amp;space;P_i\" alt=\"\\inline P_i\" align=\"absmiddle\"><span style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\"> repre\u00adsenta a press\u00e3o, <\/span><img decoding=\"async\" style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\" src=\"https:\/\/latex.codecogs.com\/gif.latex?\\rho_i\" alt=\"\\rho_i\" align=\"absmiddle\"><span style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\"> a den\u00adsi\u00addade do fluido, <\/span><img decoding=\"async\" style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\" src=\"https:\/\/latex.codecogs.com\/gif.latex?v_i\" alt=\"v_i\" align=\"absmiddle\"><span style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\"> a velo\u00adci\u00addade de esco\u00ada\u00admento, <\/span><img decoding=\"async\" style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\" src=\"https:\/\/latex.codecogs.com\/gif.latex?\\inline&amp;space;g\" alt=\"\\inline g\" align=\"absmiddle\"><span style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\"> a ace\u00adle\u00adra\u00ad\u00e7\u00e3o da gra\u00advi\u00addade e <\/span><img decoding=\"async\" style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\" src=\"https:\/\/latex.codecogs.com\/gif.latex?h_i\" alt=\"h_i\" align=\"absmiddle\"><span style=\"font-size: revert; color: initial; font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;\"> a altura dos pontos em quest\u00e3o.<\/span><\/p>\n\n\n<figure class=\"wp-block-image aligncenter size-full\"><img loading=\"lazy\" decoding=\"async\" width=\"512\" height=\"240\" src=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2023\/02\/BernoullisLawDerivationDiagram.png\" alt class=\"wp-image-52187\" srcset=\"https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2023\/02\/BernoullisLawDerivationDiagram.png 512w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2023\/02\/BernoullisLawDerivationDiagram-300x141.png 300w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2023\/02\/BernoullisLawDerivationDiagram-205x96.png 205w, https:\/\/www.ufrgs.br\/amlef\/wp-content\/uploads\/2023\/02\/BernoullisLawDerivationDiagram-480x225.png 480w\" sizes=\"auto, (max-width: 512px) 100vw, 512px\"><figcaption class=\"wp-element-caption\">Figura 2. Tubo com des\u00adn\u00ed\u00advel de altura pre\u00aden\u00adchido por um fluido em movi\u00admento, uti\u00adli\u00adzado para deduzir a Equa\u00e7\u00e3o de Ber\u00adnoulli. Fonte: Manny\u00adMax (ori\u00adgi\u00adnal), <a href=\"http:\/\/creativecommons.org\/licenses\/by-sa\/3.0\/\">CC BY-SA 3.0<\/a>, via <a href=\"https:\/\/commons.wikimedia.org\/wiki\/File:BernoullisLawDerivationDiagram.svg\">Wiki\u00adme\u00addia Commons<\/a>.<\/figcaption><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Uma das v\u00e1rias carac\u00adte\u00adr\u00eds\u00adti\u00adcas com\u00adpli\u00adca\u00addas dos fluidos \u00e9 a vis\u00adco\u00adsi\u00addade, a resis\u00adt\u00ean\u00adcia do fluido ao esco\u00ada\u00admento. Podemos dizer que um fluido bem com\u00adpor\u00adtado se adere a uma super\u00adf\u00ed\u00adcie e, quando um jato desse passa pr\u00f3ximo a uma asa, por exemplo, ele tende a seguir o perfil (ou desenho) da asa, o que faz com que ele seja dire\u00adci\u00ado\u00adnado por ela. Esse \u00e9 o Efeito Coanda, um dos res\u00adpon\u00ads\u00e1\u00adveis pelo voo dos avi\u00f5es e pelo \u201cefeito\u201d que joga\u00addo\u00adres colocam nas bolas, fazendo com que elas fa\u00e7am um trajeto curvo at\u00e9 o gol. O voo dos avi\u00f5es \u00e9 um efeito extre\u00adma\u00admente com\u00adplexo, e \u00e9 mais f\u00e1cil entend\u00ea-lo assis\u00adtindo ao v\u00eddeo abaixo:<\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"COMO O AVI\u00c3O VOA DE VERDADE SEM C\u00c1LCULO EP. 209\" width=\"1400\" height=\"788\" src=\"https:\/\/www.youtube.com\/embed\/UpU6QdspDcY?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<p class=\"has-text-align-justify wp-block-paragraph\">E assim fina\u00adli\u00adza\u00admos nossa fas\u00adci\u00adnante viagem aqu\u00e1\u00adtico-gasosa pelo vasto mundo da Mec\u00e2\u00adnica dos Fluidos, des\u00adven\u00addando os mis\u00adt\u00e9\u00adrios rela\u00adti\u00advos \u00e0s ele\u00adva\u00addas alti\u00adtu\u00addes da atmos\u00adfera at\u00e9 as pro\u00adfun\u00adde\u00adzas dos oceanos. Espero que a fluidez do texto tenha sido viscosa o sufi\u00adci\u00adente para prender sua aten\u00e7\u00e3o.<\/p>\n\n\n\n<h5 class=\"has-text-align-right wp-block-heading\">Francisco Baguinski e Gabriel Cury Perrone \/ Equipe AMLEF&nbsp;2023<\/h5>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-4adc9cd0 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\"><\/div>\n<\/div>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-wide\">\n\n\n\n<h2 class=\"wp-block-heading\">Curiosidades:<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=ItZwYNWUONw\">Incr\u00ed\u00advel gol de Roberto Carlos pela Sele\u00e7\u00e3o<\/a><\/li>\n\n\n\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=2OSrvzNW9FE&amp;t=0s\">Veri\u00adta\u00adsium: Bola de Bas\u00adquete com Backs\u00adpin Voa de uma Represa (Legenda em portugu\u00eas)<\/a><\/li>\n\n\n\n<li><a rel=\"noreferrer noopener\" href=\"https:\/\/www.youtube.com\/watch?v=E3i_XHlVCeU\" target=\"_blank\">Enten\u00addendo a sus\u00adten\u00adta\u00ad\u00e7\u00e3o aero\u00addi\u00adn\u00e2\u00admica (em ingl\u00eas)<\/a><\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-css-opacity is-style-wide\">\n\n\n\n<h2 class=\"wp-block-heading\">Refer\u00eancias:<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Wiki\u00adpe\u00addia: Efeito Coanda (<a rel=\"noreferrer noopener\" href=\"https:\/\/pt.wikipedia.org\/wiki\/Efeito_Coand%C4%83\" target=\"_blank\">PT<\/a>\/<a rel=\"noreferrer noopener\" href=\"https:\/\/en.wikipedia.org\/wiki\/Coand%C4%83_effect\" target=\"_blank\">EN<\/a>)<\/li>\n\n\n\n<li>Wiki\u00adpe\u00addia: Vis\u00adco\u00adsi\u00addade (<a rel=\"noreferrer noopener\" href=\"https:\/\/pt.wikipedia.org\/wiki\/Viscosidade\" target=\"_blank\">PT<\/a>\/<a rel=\"noreferrer noopener\" href=\"https:\/\/en.wikipedia.org\/wiki\/Viscosity\" target=\"_blank\">EN<\/a>)<\/li>\n\n\n\n<li>Wiki\u00adpe\u00addia: Equa\u00e7\u00e3o da Con\u00adti\u00adnui\u00addade (<a href=\"https:\/\/pt.wikipedia.org\/wiki\/Equa%C3%A7%C3%A3o_de_continuidade\">BR<\/a>\/<a href=\"https:\/\/en.wikipedia.org\/wiki\/Continuity_equation\">EN<\/a>)<\/li>\n\n\n\n<li>Wiki\u00adpe\u00addia: Equa\u00e7\u00e3o de Ber\u00adnoulli (<a href=\"https:\/\/pt.wikipedia.org\/wiki\/Equa%C3%A7%C3%A3o_de_Bernoulli\">PT<\/a>\/EN)<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Che\u00adga\u00admos \u00e0 hidro\u00addi\u00adn\u00e2\u00admica, o estudo dos fluidos em movi\u00admento. Esse \u00e9 um tema MUITO com\u00adplexo, mas pre\u00adten\u00adde\u00admos dar uma pin\u00adce\u00adlada no assunto. Quer saber como voa um avi\u00e3o, como Roberto Carlos (da Sele\u00e7\u00e3o, n\u00e3o o cantor) espan\u00adtou o mundo e como molhar seus amigos? D\u00ea uma olhada nesse artigo!<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_editorskit_title_hidden":false,"_editorskit_reading_time":0,"_editorskit_is_block_options_detached":false,"_editorskit_block_options_position":"{}","wp_typography_post_enhancements_disabled":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[432,582,583],"tags":[586,591,492,593],"class_list":["post-51784","post","type-post","status-publish","format-standard","hentry","category-destaques","category-expo2024-o-acervo-contra-ataca","category-exposicoes","tag-expo2022","tag-mecanica-classica","tag-mecanica-de-fluidos","tag-movimento"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.8 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Movimento: Hidrodin\u00e2mica - algumas aplica\u00e7\u00f5es - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ufrgs.br\/amlef\/2023\/02\/08\/movimento-hidrodinamica-algumas-aplicacoes\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Movimento: Hidrodin\u00e2mica - algumas aplica\u00e7\u00f5es - Museu dos Laborat\u00f3rios de Ensino de F\u00edsica - Em Transi\u00e7\u00e3o\" \/>\n<meta property=\"og:description\" content=\"Chegamos \u00e0 hidrodin\u00e2mica, o estudo dos fluidos em movimento. Esse \u00e9 um tema MUITO complexo, mas pretendemos dar uma pincelada no assunto. Quer saber como voa um avi\u00e3o, como Roberto Carlos (da Sele\u00e7\u00e3o, n\u00e3o o cantor) espantou o mundo e como molhar seus amigos? 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