{"id":26679,"date":"2025-04-05T03:21:28","date_gmt":"2025-04-05T03:21:28","guid":{"rendered":"https:\/\/www.metlaninst.com\/?p=26679"},"modified":"2025-07-12T02:33:00","modified_gmt":"2025-07-12T02:33:00","slug":"o-que-e-o-medidor-de-caudal-com-tubo-pitot","status":"publish","type":"post","link":"https:\/\/metlaninst.com\/pt\/o-que-e-o-medidor-de-caudal-com-tubo-pitot\/","title":{"rendered":"O que \u00e9 o medidor de caudal com tubo de Pitot"},"content":{"rendered":"<p>No mundo da din\u00e2mica de fluidos e do controlo de processos industriais, a medi\u00e7\u00e3o precisa do caudal \u00e9 fundamental para otimizar a efici\u00eancia, garantir a seguran\u00e7a e reduzir os custos operacionais. Entre as muitas ferramentas dispon\u00edveis, a&nbsp;<strong>Medidor de caudal com tubo de Pitot<\/strong>&nbsp;destaca-se pela sua simplicidade, fiabilidade e efic\u00e1cia de custos. Originalmente inventado no s\u00e9culo XVIII pelo engenheiro franc\u00eas Henri Pitot, este dispositivo continua a ser amplamente utilizado na avia\u00e7\u00e3o, em sistemas AVAC e em aplica\u00e7\u00f5es industriais.<\/p><div class=\"wp-block-rank-math-toc-block\" id=\"rank-math-toc\"><h2>\u00cdndice<\/h2><nav><ul><li><a href=\"#what-is-a-pitot-tube-flow-meter\">O que \u00e9 um medidor de caudal com tubo de Pitot?<\/a><\/li><li><a href=\"#principles-of-pitot-tube-flow-meters\">Princ\u00edpios dos medidores de caudal com tubo de Pitot<\/a><\/li><li><a href=\"#metlan-instruments-pitot-tube-gas-flow-meter\">Medidor de caudal de g\u00e1s com tubo Pitot da Metlan Instruments<\/a><\/li><li><a href=\"#suitable-mediums-for-pitot-tube-flow-meters\">Meios adequados para medidores de caudal com tubo de Pitot<\/a><\/li><li><a href=\"#applications-of-pitot-tube-flow-meters\">Aplica\u00e7\u00f5es dos medidores de caudal com tubo de Pitot<\/a><\/li><li><a href=\"#how-to-choose-a-pitot-tube-flow-meter\">Como escolher um medidor de caudal com tubo de Pitot<\/a><\/li><\/ul><\/nav><\/div><h2 class=\"wp-block-heading\" id=\"what-is-a-pitot-tube-flow-meter\"><strong>O que \u00e9 um medidor de caudal com tubo de Pitot?<\/strong><\/h2><p>Um medidor de caudal com tubo de Pitot \u00e9 um dispositivo que mede a velocidade do fluxo de fluido comparando&nbsp;<strong>press\u00e3o est\u00e1tica<\/strong>&nbsp;e&nbsp;<strong>press\u00e3o din\u00e2mica<\/strong>&nbsp;num fluxo de fluido. \u00c9 constitu\u00eddo por dois componentes principais:<\/p><ol class=\"wp-block-list\"><li><strong>Porto de press\u00e3o est\u00e1tica<\/strong>: Mede a press\u00e3o do fluido quando este se encontra em repouso.<\/li>\n\n<li><strong>Porta de press\u00e3o din\u00e2mica (tubo de Pitot)<\/strong>: Capta a press\u00e3o do fluido em movimento.<\/li><\/ol><p>A diferen\u00e7a entre estas duas press\u00f5es, conhecida como&nbsp;<strong>press\u00e3o de estagna\u00e7\u00e3o<\/strong>&nbsp;ou&nbsp;<strong>press\u00e3o total<\/strong>\u00e9 utilizado para calcular a velocidade do caudal. Os tubos de Pitot s\u00e3o particularmente eficazes para medir o caudal de ar na avia\u00e7\u00e3o e o caudal de g\u00e1s\/vapor em sistemas industriais.<\/p><h2 class=\"wp-block-heading\" id=\"principles-of-pitot-tube-flow-meters\"><strong>Princ\u00edpios dos medidores de caudal com tubo de Pitot<\/strong><\/h2><h3 class=\"wp-block-heading\" id=\"bernoullis-equation-the-foundation\"><strong>Equa\u00e7\u00e3o de Bernoulli: A base<\/strong><\/h3><p>O tubo de Pitot funciona com&nbsp;<strong>Princ\u00edpio de Bernoulli<\/strong>que afirma que, num fluxo constante e incompress\u00edvel, a energia total (soma da press\u00e3o est\u00e1tica, press\u00e3o din\u00e2mica e energia potencial gravitacional) permanece constante. Para um fluxo horizontal, a equa\u00e7\u00e3o simplifica-se para:<\/p><figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"100\" src=\"https:\/\/www.metlaninst.com\/wp-content\/uploads\/2025\/04\/Bernoullis-principle-for-pitot-tube-flow-meter-1024x100.png\" alt=\"Princ\u00edpio de Bernoulli para o caudal\u00edmetro com tubo de Pitot\" class=\"wp-image-26681\" srcset=\"https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Bernoullis-principle-for-pitot-tube-flow-meter-1024x100.png 1024w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Bernoullis-principle-for-pitot-tube-flow-meter-300x29.png 300w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Bernoullis-principle-for-pitot-tube-flow-meter-768x75.png 768w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Bernoullis-principle-for-pitot-tube-flow-meter-340x33.png 340w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Bernoullis-principle-for-pitot-tube-flow-meter-18x2.png 18w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Bernoullis-principle-for-pitot-tube-flow-meter-1000x98.png 1000w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Bernoullis-principle-for-pitot-tube-flow-meter-1300x127.png 1300w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Bernoullis-principle-for-pitot-tube-flow-meter.png 1490w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><p>Onde:<\/p><ul class=\"wp-block-list\"><li>Ptotal: Press\u00e3o total (medida pelo tubo de Pitot).<\/li>\n\n<li>Est\u00e1tica: Press\u00e3o est\u00e1tica.<\/li>\n\n<li>\u03c1: Densidade do fluido.<\/li>\n\n<li>v: Velocidade do fluxo.<\/li><\/ul><p>Reorganizando a equa\u00e7\u00e3o, a velocidade v<em>v<\/em>&nbsp;pode ser calculado como:<\/p><figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1024\" height=\"125\" src=\"https:\/\/www.metlaninst.com\/wp-content\/uploads\/2025\/04\/pitot-tube-flow-meter-working-principle-1024x125.jpg\" alt=\"princ\u00edpio de funcionamento do medidor de caudal com tubo pitot\" class=\"wp-image-26680\" srcset=\"https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/pitot-tube-flow-meter-working-principle-1024x125.jpg 1024w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/pitot-tube-flow-meter-working-principle-300x37.jpg 300w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/pitot-tube-flow-meter-working-principle-768x94.jpg 768w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/pitot-tube-flow-meter-working-principle-340x42.jpg 340w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/pitot-tube-flow-meter-working-principle-18x2.jpg 18w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/pitot-tube-flow-meter-working-principle-1000x122.jpg 1000w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/pitot-tube-flow-meter-working-principle-1300x159.jpg 1300w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/pitot-tube-flow-meter-working-principle.jpg 1392w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure><h3 class=\"wp-block-heading\" id=\"how-it-works\"><strong>Como funciona<\/strong><\/h3><ol start=\"1\" class=\"wp-block-list\"><li>O tubo de Pitot \u00e9 inserido no fluxo de fluido, alinhando a sua abertura com a dire\u00e7\u00e3o do fluxo.<\/li>\n\n<li>A porta de press\u00e3o din\u00e2mica capta a press\u00e3o total (Ptotal), enquanto a porta est\u00e1tica mede a press\u00e3o ambiente (Pstatic).<\/li>\n\n<li>Um sensor de press\u00e3o diferencial calcula a diferen\u00e7a (\u0394P).<\/li>\n\n<li>A velocidade do fluxo \u00e9 obtida atrav\u00e9s da equa\u00e7\u00e3o de Bernoulli.<\/li><\/ol><h2 class=\"wp-block-heading\" id=\"metlan-instruments-pitot-tube-gas-flow-meter\">Medidor de caudal de g\u00e1s com tubo Pitot da Metlan Instruments<\/h2><div class=\"wp-block-media-text is-stacked-on-mobile\"><figure class=\"wp-block-media-text__media\"><a href=\"https:\/\/metlaninst.com\/pt\/p\/medidor-de-caudal-de-gas-com-tubo-pitot-mtkb-201x\/\"><img decoding=\"async\" width=\"800\" height=\"800\" src=\"https:\/\/www.metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter.jpg\" alt=\"Medidor de caudal de g\u00e1s com tubo de Pitot\" class=\"wp-image-26683 size-full\" srcset=\"https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter.jpg 800w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter-300x300.jpg 300w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter-150x150.jpg 150w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter-768x768.jpg 768w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter-340x340.jpg 340w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter-120x120.jpg 120w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter-12x12.jpg 12w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter-600x600.jpg 600w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter-100x100.jpg 100w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter-46x46.jpg 46w, https:\/\/metlaninst.com\/wp-content\/uploads\/2025\/04\/Pitot-Tube-Gas-Flow-Meter-700x700.jpg 700w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><\/a><\/figure><div class=\"wp-block-media-text__content\"><p><strong>Carater\u00edsticas:<\/strong><\/p>\n\n<ul class=\"wp-block-list\"><li>N\u00e3o \u00e9 afetado pela vibra\u00e7\u00e3o da tubagem<\/li>\n\n<li>Aplic\u00e1vel \u00e0 medi\u00e7\u00e3o de ar sujo e h\u00famido<\/li>\n\n<li>A auto-calibra\u00e7\u00e3o em linha reduz o desvio de dados<\/li>\n\n<li>Alta sensibilidade, o limite inferior \u00e9 de at\u00e9 5 Nm\/s<\/li>\n\n<li>R\u00e1cio de abertura ampla de 1:60<\/li>\n\n<li>Medi\u00e7\u00e3o de caudal bidirecional<\/li>\n\n<li>Integra sensores de press\u00e3o e temperatura para monitorizar a press\u00e3o e a temperatura do g\u00e1s em linha<\/li>\n\n<li>Sem partes m\u00f3veis, baixa queda de press\u00e3o<\/li><\/ul><\/div><\/div><h2 class=\"wp-block-heading\" id=\"suitable-mediums-for-pitot-tube-flow-meters\"><strong>Meios adequados para medidores de caudal com tubo de Pitot<\/strong><\/h2><p>Os tubos de Pitot s\u00e3o excelentes em condi\u00e7\u00f5es de fluido espec\u00edficas:<\/p><h3 class=\"wp-block-heading\" id=\"ideal-fluids\"><strong>Fluidos ideais<\/strong><\/h3><ol class=\"wp-block-list\"><li><strong>Gases limpos<\/strong>:<ul class=\"wp-block-list\"><li>Ar, azoto, oxig\u00e9nio e vapor.<\/li>\n\n<li>O m\u00ednimo de part\u00edculas evita o entupimento dos orif\u00edcios de press\u00e3o.<\/li><\/ul><\/li>\n\n<li><strong>L\u00edquidos de baixa viscosidade<\/strong>:<ul class=\"wp-block-list\"><li>\u00c1gua, \u00f3leos leves e produtos qu\u00edmicos.<\/li><\/ul><\/li>\n\n<li><strong>Escoamento est\u00e1vel e turbulento<\/strong>:<ul class=\"wp-block-list\"><li>O fluxo laminar (movimento suave e ordenado) \u00e9 menos adequado devido a leituras de press\u00e3o inconsistentes.<\/li><\/ul><\/li><\/ol><h3 class=\"wp-block-heading\" id=\"unsuitable-fluids\"><strong>Fluidos inadequados<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Fluidos de alta viscosidade<\/strong>: Mel, \u00f3leos pesados (provocam desfasamento de press\u00e3o).<\/li>\n\n<li><strong>Fluidos sujos ou com lama<\/strong>: As part\u00edculas podem bloquear o tubo.<\/li>\n\n<li><strong>Escoamentos multif\u00e1sicos<\/strong>: Misturas de g\u00e1s e l\u00edquido (por exemplo, vapor h\u00famido).<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"applications-of-pitot-tube-flow-meters\"><strong>Aplica\u00e7\u00f5es dos medidores de caudal com tubo de Pitot<\/strong><\/h2><h3 class=\"wp-block-heading\" id=\"1-aviation\"><strong>1. Avia\u00e7\u00e3o<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Medi\u00e7\u00e3o da velocidade do ar<\/strong>: Os tubos de Pitot nas asas dos avi\u00f5es medem a velocidade do ar comparando as press\u00f5es atmosf\u00e9ricas e din\u00e2micas.<\/li>\n\n<li><strong>Fun\u00e7\u00e3o cr\u00edtica de seguran\u00e7a<\/strong>: As avarias (por exemplo, bloqueios devido ao gelo) podem levar a leituras erradas, o que real\u00e7a a necessidade de sistemas de aquecimento nos avi\u00f5es modernos.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"2-hvac-systems\"><strong>2. Sistemas HVAC<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Monitoriza\u00e7\u00e3o do fluxo de ar nas condutas<\/strong>: Assegura uma distribui\u00e7\u00e3o equilibrada do ar em edif\u00edcios comerciais.<\/li>\n\n<li><strong>Efici\u00eancia energ\u00e9tica<\/strong>: Detecta fugas ou inefici\u00eancias nos sistemas de ventila\u00e7\u00e3o.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"3-industrial-process-control\"><strong>3. Controlo de processos industriais<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Medi\u00e7\u00e3o do caudal de vapor<\/strong>: Monitoriza a produ\u00e7\u00e3o das caldeiras nas centrais el\u00e9ctricas.<\/li>\n\n<li><strong>Monitoriza\u00e7\u00e3o de gasodutos<\/strong>: Monitoriza o fluxo de g\u00e1s natural nas linhas de transporte.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"4-environmental-engineering\"><strong>4. Engenharia do ambiente<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Ensaios em t\u00fanel de vento<\/strong>: Mede a velocidade do fluxo de ar em investiga\u00e7\u00e3o aerodin\u00e2mica.<\/li>\n\n<li><strong>Controlo da polui\u00e7\u00e3o<\/strong>: Avalia as emiss\u00f5es de gases de chamin\u00e9 em f\u00e1bricas.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"5-water-management\"><strong>5. Gest\u00e3o da \u00e1gua<\/strong><\/h3><ul class=\"wp-block-list\"><li><strong>Escoamento em canal aberto<\/strong>: Os tubos de Pitot modificados medem o caudal de rios ou canais.<\/li><\/ul><h2 class=\"wp-block-heading\" id=\"how-to-choose-a-pitot-tube-flow-meter\"><strong>Como escolher um medidor de caudal com tubo de Pitot<\/strong><\/h2><h3 class=\"wp-block-heading\" id=\"1-fluid-compatibility\"><strong>1. Compatibilidade de fluidos<\/strong><\/h3><ul class=\"wp-block-list\"><li>Certifique-se de que o material do tubo (por exemplo, a\u00e7o inoxid\u00e1vel, lat\u00e3o) resiste \u00e0 corros\u00e3o do fluido.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"2-flow-profile\"><strong>2. Perfil do fluxo<\/strong><\/h3><ul class=\"wp-block-list\"><li>Utiliza\u00e7\u00e3o\u00a0<strong>m\u00e9dia dos tubos de Pitot<\/strong>\u00a0(por exemplo, Annubar\u00ae) para caudais n\u00e3o uniformes em tubos de grandes dimens\u00f5es.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"3-pressure-range\"><strong>3. Gama de press\u00e3o<\/strong><\/h3><ul class=\"wp-block-list\"><li>Selecionar um sensor capaz de suportar a press\u00e3o m\u00e1xima do sistema.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"4-temperature-conditions\"><strong>4. Condi\u00e7\u00f5es de temperatura<\/strong><\/h3><ul class=\"wp-block-list\"><li>As aplica\u00e7\u00f5es a alta temperatura podem exigir conjuntos de arrefecimento.<\/li><\/ul><h3 class=\"wp-block-heading\" id=\"5-output-requirements\"><strong>5. Requisitos de produ\u00e7\u00e3o<\/strong><\/h3><ul class=\"wp-block-list\"><li>Escolha sa\u00eddas anal\u00f3gicas (4-20 mA) ou digitais (Modbus, HART) para integra\u00e7\u00e3o com sistemas de controlo.<\/li><\/ul><p>Apesar das suas origens no s\u00e9culo XVIII, o medidor de caudal com tubo de Pitot continua a ser a pedra angular da medi\u00e7\u00e3o da velocidade de fluidos. A sua simplicidade, durabilidade e baixo custo tornam-no indispens\u00e1vel na avia\u00e7\u00e3o, AVAC e ambientes industriais. Embora as tecnologias mais recentes ofere\u00e7am maior precis\u00e3o para caudais complexos, a fiabilidade do tubo de Pitot em ambientes limpos e est\u00e1veis garante a sua relev\u00e2ncia cont\u00ednua.<\/p><p>Ao compreender os seus princ\u00edpios, limita\u00e7\u00f5es e aplica\u00e7\u00f5es ideais, os engenheiros podem tirar partido desta ferramenta intemporal para melhorar o desempenho e a sustentabilidade do sistema.<\/p>","protected":false},"excerpt":{"rendered":"<p>In the world of fluid dynamics and industrial process control, accurate flow measurement is critical for optimizing efficiency, ensuring safety, and reducing operational costs. Among the many tools available, the&nbsp;Pitot tube flow meter&nbsp;stands out for its simplicity, reliability, and cost-effectiveness. Originally invented in the 18th century by French engineer Henri Pitot, this device remains widely [&hellip;]<\/p>","protected":false},"author":1,"featured_media":26682,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[154,238],"tags":[],"class_list":["post-26679","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-air-flow-meters","category-pitot-tube-gas-flow-meter"],"_links":{"self":[{"href":"https:\/\/metlaninst.com\/pt\/wp-json\/wp\/v2\/posts\/26679","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/metlaninst.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/metlaninst.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/metlaninst.com\/pt\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/metlaninst.com\/pt\/wp-json\/wp\/v2\/comments?post=26679"}],"version-history":[{"count":1,"href":"https:\/\/metlaninst.com\/pt\/wp-json\/wp\/v2\/posts\/26679\/revisions"}],"predecessor-version":[{"id":26684,"href":"https:\/\/metlaninst.com\/pt\/wp-json\/wp\/v2\/posts\/26679\/revisions\/26684"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/metlaninst.com\/pt\/wp-json\/wp\/v2\/media\/26682"}],"wp:attachment":[{"href":"https:\/\/metlaninst.com\/pt\/wp-json\/wp\/v2\/media?parent=26679"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/metlaninst.com\/pt\/wp-json\/wp\/v2\/categories?post=26679"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/metlaninst.com\/pt\/wp-json\/wp\/v2\/tags?post=26679"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}