{"id":2191,"date":"2026-10-15T01:40:10","date_gmt":"2026-10-15T00:40:10","guid":{"rendered":"https:\/\/wpcalc.com\/pt\/engenharia\/numero-de-reynolds\/"},"modified":"2026-10-15T01:40:10","modified_gmt":"2026-10-15T00:40:10","slug":"numero-de-reynolds","status":"publish","type":"post","link":"https:\/\/wpcalc.com\/pt\/engenharia\/numero-de-reynolds\/","title":{"rendered":"N\u00famero de Reynolds"},"content":{"rendered":"<section class=\"not-prose calculator-box\" aria-labelledby=\"calculator-title\"><div class=\"flex items-baseline sm:items-center justify-between gap-2 sm:gap-3\"><div class=\"flex flex-col sm:flex-row sm:items-center gap-2\"><span class=\"icon icon-calculator text-primary-700! text-base! dark:text-primary-300!\" aria-hidden=\"true\"><\/span><h2 id=\"calculator-title\" class=\"text-lg font-display font-bold\">Verifique se o escoamento no tubo \u00e9 laminar ou turbulento<\/h2><\/div><div class=\"calcdash-favorite group\">\n  <button type=\"button\" class=\"favorite\" id=\"favorite\" data-favorite-id=\"2191\" data-favorite-title=\"N\u00famero de Reynolds\" data-favorite-url=\"https:\/\/wpcalc.com\/pt\/engenharia\/numero-de-reynolds\/\" data-favorite-excerpt=\"Informe a velocidade do fluido, o di\u00e2metro do tubo e a viscosidade para calcular o n\u00famero de Reynolds e descobrir imediatamente se o escoamento no tubo \u00e9 laminar, de transi\u00e7\u00e3o ou turbulento. Funciona com viscosidade cinem\u00e1tica ou din\u00e2mica e unidades m\u00e9tricas ou dos EUA.\" aria-label=\"Adicionar aos favoritos\" data-favorite-icon=\"icon icon-pipeline\">\n    <span class=\"icon icon-shape-star-empty\" aria-hidden=\"true\"><\/span>\n  <\/button>\n  <div class=\"calcdash-favorite__tip\" aria-hidden=\"true\">\n   <span class=\"favorite-tooltip\" id=\"favorite-tooltip\"><\/span>\n  <\/div>\n  <span class=\"sr-only\" role=\"status\" id=\"favorite-status\"><\/span>\n<\/div><\/div><form action=\"https:\/\/wpcalc.com\/pt\/engenharia\/numero-de-reynolds\/\" method=\"POST\" class=\"calculator\" id=\"calculator-2191\" data-post=\"2191\"><fieldset class=\"fieldset-input is-1\"><legend class=\"sr-only\">Campos de entrada<\/legend><div class=\"field has-term\" id=\"input-1\"><label for=\"field-1\">Velocidade do fluido (v)<\/label><div class=\"term\">v<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"velocidade_do_fluido_v\" id=\"field-1\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"1\"\/><div class=\"grid grid-cols-1\"><select id=\"field-2\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"ms\" selected>m\/s<\/option><option value=\"fts\">ft\/s<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field has-term\" id=\"input-2\"><label for=\"field-3\">Di\u00e2metro interno do tubo (D)<\/label><div class=\"term\">D<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"dimetro_interno_do_tubo_d\" id=\"field-3\" aria-describedby=\"calc-info-3\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"50\"\/><div class=\"grid grid-cols-1\"><select id=\"field-4\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"m\">m<\/option><option value=\"cm\">cm<\/option><option value=\"mm\" selected>mm<\/option><option value=\"in\">pol<\/option><option value=\"ft\">ft<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-3\">Comprimento caracter\u00edstico: di\u00e2metro interno do tubo para escoamento interno.<\/small><\/div><div class=\"field\" id=\"input-3\"><label for=\"field-5\">Entrada de viscosidade<\/label><div class=\"grid grid-cols-1\"><select id=\"field-5\" name=\"entrada_de_viscosidade\"><option value=\"kinematic\" selected>Viscosidade cinem\u00e1tica (\u03bd)<\/option><option value=\"dynamic\">Massa espec\u00edfica e viscosidade din\u00e2mica (\u03c1, \u03bc)<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><div class=\"field has-term\" id=\"input-4\"><label for=\"field-6\">Viscosidade cinem\u00e1tica (\u03bd)<\/label><div class=\"term\">\u03bd<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"viscosidade_cinemtica_\" id=\"field-6\" aria-describedby=\"calc-info-6\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"1\"\/><div class=\"grid grid-cols-1\"><select id=\"field-7\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"m2s\">m\u00b2\/s<\/option><option value=\"cst\" selected>cSt<\/option><option value=\"ft2s\">ft\u00b2\/s<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-6\">\u00c1gua a 20 \u00b0C \u2248 1 cSt; ar \u2248 15 cSt.<\/small><\/div><div class=\"field has-term\" id=\"input-5\" hidden><label for=\"field-8\">Massa espec\u00edfica (\u03c1)<\/label><div class=\"term\">\u03c1<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"massa_especfica_\" id=\"field-8\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"998\"\/><div class=\"grid grid-cols-1\"><select id=\"field-9\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"kgm3\" selected>kg\/m\u00b3<\/option><option value=\"gcm3\">g\/cm\u00b3<\/option><option value=\"lbft3\">lb\/ft\u00b3<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><\/div><div class=\"field has-term\" id=\"input-6\" hidden><label for=\"field-10\">Viscosidade din\u00e2mica (\u03bc)<\/label><div class=\"term\">\u03bc<\/div>  <div class=\"absolute bottom-0 left-16 top-8 w-2 h-0.5 bg-blue-500\"><\/div><div class=\"field-group\"><input type=\"text\" name=\"viscosidade_dinmica_\" id=\"field-10\" aria-describedby=\"calc-info-10\" data-number inputmode=\"decimal\" autocomplete=\"off\" spellcheck=\"false\" min=\"0\" value=\"0.001\"\/><div class=\"grid grid-cols-1\"><select id=\"field-11\" name=\"unidade\" aria-label=\"Unidade\"><option value=\"pas\" selected>Pa\u00b7s<\/option><option value=\"cp\">cP<\/option><option value=\"lbfts\">lb\/(ft\u00b7s)<\/option><\/select><svg class=\"pointer-events-none col-start-1 row-start-1 mr-2 size-5 self-center justify-self-end text-gray-500 sm:size-4\" viewBox=\"0 0 16 16\" fill=\"currentColor\" aria-hidden=\"true\" data-slot=\"icon\">\n              <path fill-rule=\"evenodd\" d=\"M4.22 6.22a.75.75 0 0 1 1.06 0L8 8.94l2.72-2.72a.75.75 0 1 1 1.06 1.06l-3.25 3.25a.75.75 0 0 1-1.06 0L4.22 7.28a.75.75 0 0 1 0-1.06Z\" clip-rule=\"evenodd\" \/>\n            <\/svg><\/div><\/div><small id=\"calc-info-10\">\u00c1gua a 20 \u00b0C \u2248 0,001 Pa\u00b7s = 1 cP.<\/small><\/div><\/fieldset><div class=\"buttons\"><button type=\"submit\" data-text=\"Recalcular\" id=\"calculate-button\" data-post=\"2191\">Calcular<\/button><button type=\"reset\">Redefinir<\/button><\/div><div class=\"field is-checkbox hidden!\" id=\"field-auto-calc\"><input type=\"checkbox\" id=\"auto-calc\"><label for=\"auto-calc\">Calcular automaticamente<\/label><small>Se ativado, o resultado \u00e9 atualizado automaticamente quando voc\u00ea altera qualquer valor.<\/small><\/div><div class=\"fieldset-result is-hidden\" aria-labelledby=\"result-title\" aria-live=\"polite\" role=\"region\"> <h3 class=\"result-title bg-gradient-to-r from-primary-50 to-gray-50 dark:from-primary-900 dark:to-gray-800\" id=\"result-title\"><span class=\"icon icon-s-pulse\" aria-hidden=\"true\"><\/span> Seus resultados<\/h3><div class=\"result-box\"><div class=\"field-result\" id=\"output-1\"><span class=\"field-title\"><span>N\u00famero de Reynolds<\/span><span class=\"result-term\">Re<\/span><\/span><span class=\"field-value\" id=\"result-1\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><div class=\"field-result is-column\" id=\"output-2\"><span class=\"field-title\"><span>Regime de escoamento (tubo)<\/span><\/span><span class=\"field-value\" id=\"result-2\"><\/span><button type=\"button\" class=\"copy-result\" data-tooltip=\"Copiar resultado\" aria-label=\"Copiar resultado\"><span class=\"copy-icon icon icon-document-copy\" aria-hidden=\"true\"><\/span><\/button><\/div><\/div><div class=\"result-actions\"><button type=\"button\" class=\"copy-link\"><svg viewBox=\"0 0 20 20\" fill=\"currentColor\" aria-hidden=\"true\"><path d=\"M12.232 4.232a2.5 2.5 0 0 1 3.536 3.536l-1.225 1.224a.75.75 0 0 0 1.061 1.06l1.224-1.224a4 4 0 0 0-5.656-5.656l-3 3a4 4 0 0 0 .225 5.865.75.75 0 0 0 .977-1.138 2.5 2.5 0 0 1-.142-3.667l3-3Z\"\/><path d=\"M11.603 7.963a.75.75 0 0 0-.977 1.138 2.5 2.5 0 0 1 .142 3.667l-3 3a2.5 2.5 0 0 1-3.536-3.536l1.225-1.224a.75.75 0 0 0-1.061-1.06l-1.224 1.224a4 4 0 1 0 5.656 5.656l3-3a4 4 0 0 0-.225-5.865Z\"\/><\/svg><span class=\"copy-link__text\">Copiar link para este c\u00e1lculo<\/span><\/button><span class=\"sr-only\" role=\"status\" id=\"copy-link-status\"><\/span><\/div><\/div><a href=\"#respond\" class=\"hidden transition-opacity duration-300 opacity-0 w-50 text-sm justify-center items-center gap-2 px-4 py-2 rounded bg-gray-200 text-gray-700 hover:bg-gray-300\" id=\"leave-comment\"><span class=\"icon icon-comments\" aria-hidden=\"true\"><\/span>Deixar um coment\u00e1rio<\/a><\/form><\/section><section id=\"calc-reactions\" class=\"not-prose hidden my-12 bg-gradient-to-r from-primary-50 to-gray-50 border border-indigo-100 rounded-xl px-6 py-4 shadow-sm\" data-post=\"2191\" aria-live=\"polite\" aria-labelledby=\"calc-reactions-title\"><p id=\"calc-reactions-title\" class=\"text-sm text-gray-500 text-center mb-2\">O que voc\u00ea achou deste resultado?<\/p><div role=\"group\" aria-labelledby=\"calc-reactions-title\" class=\"grid grid-cols-3 sm:flex sm:flex-row sm:justify-around gap-4 sm:items-center sm:flex-wrap\"><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"like\"><span class=\"reaction-count\" data-reaction-count=\"like\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude00 <\/span><span class=\"reaction-description font-medium\">Curti <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"helpful\"><span class=\"reaction-count\" data-reaction-count=\"helpful\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\udca1 <\/span><span class=\"reaction-description font-medium\">\u00datil <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"confused\"><span class=\"reaction-count\" data-reaction-count=\"confused\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude15 <\/span><span class=\"reaction-description font-medium\">Confuso <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"disappointed\"><span class=\"reaction-count\" data-reaction-count=\"disappointed\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\ud83d\ude1e <\/span><span class=\"reaction-description font-medium\">Decepcionado <\/span><\/button><button type=\"button\" aria-pressed=\"false\" class=\"reaction-btn flex flex-col items-center gap-1 text-sm text-gray-700 hover:text-primary-600 cursor-pointer transition-transform hover:scale-105\" data-reaction=\"inaccurate\"><span class=\"reaction-count\" data-reaction-count=\"inaccurate\">0<\/span><span class=\"reaction text-3xl\" aria-hidden=\"true\">\u274c <\/span><span class=\"reaction-description font-medium\">Impreciso <\/span><\/button><\/div><div id=\"reaction-message\" class=\"hidden mt-8 rounded-md border border-primary-100 bg-white\/50 backdrop-blur-sm px-4 py-2 text-sm text-center shadow-sm\"><\/div><\/section><div class=\"calcdash-ad not-prose calcdash-ad--calc_result calcdash-ad--in-article\"><ins class=\"adsbygoogle\" style=\"display:block\" data-ad-client=\"ca-pub-1721569815777345\" data-ad-slot=\"6317458308\" data-ad-layout=\"in-article\" data-ad-format=\"fluid\"><\/ins><script>(adsbygoogle = window.adsbygoogle || []).push({});<\/script><\/div>\n<style id=\"wpcoderpro-inline-1\">.formula-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section class=\"formula-box\" aria-labelledby=\"formula-title\">\r\n\t<div id=\"formula-title\" class=\"not-prose font-display mb-4\"><span class=\"icon icon-formula\" aria-hidden=\"true\"><\/span><h2>F\u00f3rmula do n\u00famero de Reynolds<\/h2><\/div>\r\n\t<figure class=\"not-prose formula\">\r\n\t\t<figcaption class=\"formula-title\">F\u00f3rmula<\/figcaption>\r\n\t\t<div class=\"text-base text-gray-800\" id=\"formula\">\n\\[ Re = \\frac{v\\,D}{\\nu} \\]\n<\/div>\r\n\t<\/figure>\r\n\t<\/p>\n<p><strong>Onde:<\/strong><\/p>\n<ul>\n<li>\\(Re\\) \u2014 n\u00famero de Reynolds (adimensional)<\/li>\n<li>\\(v\\) \u2014 velocidade m\u00e9dia do fluido no tubo (m\/s)<\/li>\n<li>\\(D\\) \u2014 comprimento caracter\u00edstico, ou seja, o di\u00e2metro interno do tubo no caso de escoamento interno (m)<\/li>\n<li>\\(\\nu\\) \u2014 viscosidade cinem\u00e1tica do fluido (m\u00b2\/s)<\/li>\n<\/ul>\n<p>A f\u00f3rmula compara as for\u00e7as inerciais (numerador) com as for\u00e7as viscosas (denominador). Se voc\u00ea preferir trabalhar com a densidade \\(\\rho\\) e a viscosidade din\u00e2mica \\(\\mu\\), substitua \\(\\nu = \\mu \/ \\rho\\):<\/p>\n<p>\\[ Re = \\frac{\\rho\\, v\\, D}{\\mu} \\]<\/p>\n<p>\r\n<\/section>\n<style id=\"wpcoderpro-inline-2\">.calculation-box {\r\n\tborder-bottom: none !important;\r\n}<\/style><section id=\"calculation\" class=\"calculation-box\" aria-labelledby=\"calculation-title\">\r\n\t<div id=\"calculation-title\" class=\"not-prose font-display\"><span class=\"icon icon-unordered-list\" aria-hidden=\"true\"><\/span><h2>N\u00famero de Reynolds \u2013 Exemplo de c\u00e1lculo<\/h2><\/div>\r\n\r\n<\/p>\n<p><strong>Exemplo:<\/strong> \u00e1gua a 20 \u00b0C escoa em um tubo com di\u00e2metro interno de 50 mm a uma velocidade de 1 m\/s. A viscosidade cinem\u00e1tica da \u00e1gua nessa temperatura \u00e9 de aproximadamente 1 cSt = \\(1\\times10^{-6}\\) m\u00b2\/s.<\/p>\n<p>\\[ Re = \\frac{v\\,D}{\\nu} = \\frac{1 \\times 0.05}{1\\times10^{-6}} = 50\\,000 \\]<\/p>\n<p><strong>Resultado:<\/strong> \\(Re = 50\\,000\\). Como \\(Re \\geq 4000\\), o regime de escoamento \u00e9 totalmente turbulento.<\/p>\n<p>\n\r\n<\/section>\n<h2>Como usar a calculadora<\/h2>\n<ol>\n<li>Digite a <strong>Velocidade do fluido (v)<\/strong> e escolha a unidade (m\/s ou ft\/s).<\/li>\n<li>Informe o <strong>Di\u00e2metro interno do tubo (D)<\/strong> \u2014 esse \u00e9 o comprimento caracter\u00edstico do escoamento em tubos \u2014 e selecione a unidade (m, cm, mm, in ou ft).<\/li>\n<li>Escolha o modo de <strong>entrada da viscosidade<\/strong>: <em>Viscosidade cinem\u00e1tica (\u03bd)<\/em> ou <em>Densidade e viscosidade din\u00e2mica (\u03c1, \u03bc)<\/em>. A calculadora exibe apenas os campos correspondentes \u00e0 sua escolha.<\/li>\n<li>Se voc\u00ea optou pela viscosidade cinem\u00e1tica, informe o valor em m\u00b2\/s, cSt ou ft\u00b2\/s. Para \u00e1gua a 20 \u00b0C, use cerca de 1 cSt; para o ar, aproximadamente 15 cSt.<\/li>\n<li>Se escolheu o modo densidade\/viscosidade din\u00e2mica, informe a <strong>Densidade (\u03c1)<\/strong> e a <strong>Viscosidade din\u00e2mica (\u03bc)<\/strong> em qualquer uma das unidades suportadas (para \u00e1gua a 20 \u00b0C: 998 kg\/m\u00b3 e 0,001 Pa\u00b7s).<\/li>\n<li>Leia o resultado do <strong>n\u00famero de Reynolds<\/strong> e do <strong>Regime de escoamento<\/strong>, que classifica o fluxo como laminar, de transi\u00e7\u00e3o ou turbulento.<\/li>\n<\/ol>\n<h2>O que \u00e9 o n\u00famero de Reynolds?<\/h2>\n<p>O n\u00famero de Reynolds \u00e9 uma grandeza adimensional que permite prever o padr\u00e3o de escoamento de um fluido. Ele expressa a raz\u00e3o entre as for\u00e7as inerciais, que tendem a manter o fluido em movimento e misturado, e as for\u00e7as viscosas, que amortecem o movimento e mant\u00eam o escoamento ordenado. Por ser adimensional, um mesmo valor indica o mesmo comportamento de escoamento, independentemente do fluido, do tamanho do tubo ou do sistema de unidades usado.<\/p>\n<p>No escoamento interno em tubos, distinguem-se tr\u00eas regimes. O <strong>escoamento laminar<\/strong> (\\(Re &lt; 2300\\)) \u00e9 suave e em camadas: o fluido se move em l\u00e2minas paralelas, sem correntes cruzadas, e os efeitos viscosos dominam. O <strong>escoamento turbulento<\/strong> (\\(Re \\geq 4000\\)) \u00e9 ca\u00f3tico, dominado por v\u00f3rtices e mistura r\u00e1pida. Entre os dois fica a faixa de <strong>transi\u00e7\u00e3o<\/strong> (\\(2300 \\leq Re &lt; 4000\\)), em que o escoamento \u00e9 inst\u00e1vel e pode alternar entre laminar e turbulento dependendo de perturba\u00e7\u00f5es, rugosidade do tubo e efeitos de entrada.<\/p>\n<p>O regime importa porque determina como o fluido se comporta na pr\u00e1tica. A perda de carga em tubos com escoamento laminar cresce linearmente com a velocidade, enquanto em tubos com escoamento turbulento ela cresce aproximadamente com o quadrado da velocidade. A transfer\u00eancia de calor, a efici\u00eancia de mistura, a eros\u00e3o e a escolha das correla\u00e7\u00f5es do fator de atrito (por exemplo, o fator de atrito de Darcy) dependem de o escoamento ser laminar ou turbulento. Se mais tarde voc\u00ea precisar dimensionar uma bomba para o sistema, esta <a href=\"https:\/\/wpcalc.com\/pt\/engenharia\/potencia-da-bomba\/\">calculadora de pot\u00eancia de bomba<\/a> pode ajudar a estimar a pot\u00eancia necess\u00e1ria quando voc\u00ea j\u00e1 conhece a vaz\u00e3o e a perda de carga.<\/p>\n<h2>Valores t\u00edpicos e pontos de refer\u00eancia<\/h2>\n<table>\n<thead>\n<tr>\n<th>Fluido (aprox. 20 \u00b0C)<\/th>\n<th>Viscosidade cinem\u00e1tica \u03bd<\/th>\n<th>Viscosidade din\u00e2mica \u03bc<\/th>\n<th>Densidade \u03c1<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>\u00c1gua<\/td>\n<td>1,0 cSt<\/td>\n<td>0,001 Pa\u00b7s (1 cP)<\/td>\n<td>998 kg\/m\u00b3<\/td>\n<\/tr>\n<tr>\n<td>Ar (atmosf\u00e9rico)<\/td>\n<td>15 cSt<\/td>\n<td>1,8\u00d710\u207b\u2075 Pa\u00b7s<\/td>\n<td>1,2 kg\/m\u00b3<\/td>\n<\/tr>\n<tr>\n<td>\u00d3leo de motor (SAE 30)<\/td>\n<td>\u2248 200\u2013500 cSt<\/td>\n<td>\u2248 0,3 Pa\u00b7s<\/td>\n<td>\u2248 890 kg\/m\u00b3<\/td>\n<\/tr>\n<tr>\n<td>Glicerina<\/td>\n<td>\u2248 1180 cSt<\/td>\n<td>1,5 Pa\u00b7s<\/td>\n<td>1260 kg\/m\u00b3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Premissas e limita\u00e7\u00f5es<\/h2>\n<ul>\n<li>Os valores cr\u00edticos 2300 e 4000 valem para <strong>escoamento totalmente desenvolvido em um tubo circular reto<\/strong>. Para outras geometrias (placas planas, dutos, ao redor de esferas ou asas de avi\u00e3o), o comprimento caracter\u00edstico e os n\u00fameros de Reynolds cr\u00edticos s\u00e3o diferentes.<\/li>\n<li>O comprimento caracter\u00edstico aqui \u00e9 o di\u00e2metro <em>interno<\/em> do tubo. Para um duto n\u00e3o circular, use o di\u00e2metro hidr\u00e1ulico \\(D_h = 4A\/P\\), onde \\(A\\) \u00e9 a \u00e1rea da se\u00e7\u00e3o transversal e \\(P\\), o per\u00edmetro molhado.<\/li>\n<li>A viscosidade varia bastante com a temperatura. Use sempre a viscosidade na temperatura real do fluido, caso contr\u00e1rio o n\u00famero de Reynolds calculado pode ficar significativamente errado.<\/li>\n<li>A calculadora assume um <strong>fluido newtoniano<\/strong> com uma \u00fanica velocidade m\u00e9dia. Fluidos n\u00e3o newtonianos (polpas, solu\u00e7\u00f5es de pol\u00edmeros, sangue) exigem defini\u00e7\u00f5es modificadas do n\u00famero de Reynolds.<\/li>\n<li>Efeitos de entrada, rugosidade do tubo e perturba\u00e7\u00f5es podem deslocar a faixa de transi\u00e7\u00e3o em algumas centenas de unidades de Reynolds para qualquer um dos lados; portanto, trate valores pr\u00f3ximos de 2300 ou 4000 como aproximados.<\/li>\n<\/ul>\n<p>Para outros c\u00e1lculos de engenharia \u2014 por exemplo, estimar o <a href=\"https:\/\/wpcalc.com\/pt\/engenharia\/trabalho-especifico-turbina-a-gas\/\">trabalho espec\u00edfico de uma turbina a g\u00e1s<\/a> \u2014 voc\u00ea pode explorar as demais calculadoras do site.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Informe a velocidade do fluido, o di\u00e2metro do tubo e a viscosidade para calcular o n\u00famero de Reynolds e descobrir imediatamente se o escoamento no tubo \u00e9 laminar, de transi\u00e7\u00e3o ou turbulento. Funciona com viscosidade cinem\u00e1tica ou din\u00e2mica e unidades m\u00e9tricas ou dos EUA.<\/p>\n","protected":false},"author":3168,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[6],"tags":[63],"class_list":["post-2191","post","type-post","status-publish","format-standard","hentry","category-engenharia","tag-tubagem"],"acf":[],"_links":{"self":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2191","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/users\/3168"}],"replies":[{"embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/comments?post=2191"}],"version-history":[{"count":0,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/posts\/2191\/revisions"}],"wp:attachment":[{"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/media?parent=2191"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/categories?post=2191"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wpcalc.com\/pt\/wp-json\/wp\/v2\/tags?post=2191"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}