{"id":699885,"date":"2024-10-09T11:40:36","date_gmt":"2024-10-09T10:40:36","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=699885"},"modified":"2024-10-09T11:40:36","modified_gmt":"2024-10-09T10:40:36","slug":"truyen-nhiet-trong-dong-chay-tang","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/truyen-nhiet-trong-dong-chay-tang\/","title":{"rendered":"Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y t\u1ea7ng"},"content":{"rendered":"<p class=\"sidekick\">Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y t\u1ea7ng: t\u00ecm hi\u1ec3u c\u01a1 ch\u1ebf truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea5t l\u1ecfng, c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng v\u00e0 \u1ee9ng d\u1ee5ng trong c\u00f4ng nghi\u1ec7p.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/truyen_nhiet_trong_dong_chay_tang.png\" alt=\"Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y t\u1ea7ng\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Truy\u1ec1n Nhi\u1ec7t Trong D\u00f2ng Ch\u1ea3y T\u1ea7ng<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y t\u1ea7ng l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong ng\u00e0nh k\u1ef9 thu\u1eadt nhi\u1ec7t. \u0110\u00e2y l\u00e0 qu\u00e1 tr\u00ecnh m\u00e0 nhi\u1ec7t \u0111\u01b0\u1ee3c chuy\u1ec3n t\u1eeb v\u00f9ng c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao sang v\u00f9ng c\u00f3 nhi\u1ec7t \u0111\u1ed9 th\u1ea5p trong m\u1ed9t ch\u1ea5t l\u1ecfng ch\u1ea3y theo l\u1edbp m\u1ecfng ho\u1eb7c d\u00f2ng ch\u1ea3y t\u1ea7ng.<\/p>\n<h2>Kh\u00e1i Ni\u1ec7m D\u00f2ng Ch\u1ea3y T\u1ea7ng<\/h2>\n<p>D\u00f2ng ch\u1ea3y t\u1ea7ng (laminar flow) l\u00e0 d\u00f2ng ch\u1ea3y trong \u0111\u00f3 ch\u1ea5t l\u1ecfng di chuy\u1ec3n trong nh\u1eefng l\u1edbp song song v\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 tr\u1ed9n l\u1eabn gi\u1eefa c\u00e1c l\u1edbp n\u00e0y. \u0110i\u1ec1u n\u00e0y th\u01b0\u1eddng x\u1ea3y ra khi ch\u1ea5t l\u1ecfng di chuy\u1ec3n v\u1edbi t\u1ed1c \u0111\u1ed9 th\u1ea5p v\u00e0 l\u1ef1c qu\u00e1n t\u00ednh c\u1ee7a n\u00f3 c\u0169ng nh\u1ecf so v\u1edbi l\u1ef1c nh\u1edbt.<\/p>\n<ul>\n<li>Re <sub>c<\/sub> &lt; 2100: D\u00f2ng ch\u1ea3y t\u1ea7ng<\/li>\n<li>Re <sub>c<\/sub> &gt; 4000: D\u00f2ng ch\u1ea3y r\u1ed1i<\/li>\n<li>2100 &lt; Re <sub>c<\/sub> &lt; 4000: Khu v\u1ef1c chuy\u1ec3n ti\u1ebfp<\/li>\n<\/ul>\n<p>\u1ede \u0111\u00e2y, <i>Re<sub>c<\/sub><\/i> l\u00e0 s\u1ed1 Reynolds, \u0111\u01b0\u1ee3c \u0111\u1ecbnh ngh\u0129a nh\u01b0 sau:<\/p>\n<p><i>Re = \\(\\frac{\\rho vD}{\\mu}\\)<\/i><\/p>\n<p>V\u1edbi:<\/p>\n<ul>\n<li>\\(\\rho\\): Kh\u1ed1i l\u01b0\u1ee3ng ri\u00eang c\u1ee7a ch\u1ea5t l\u1ecfng (kg\/m<sup>3<\/sup>)<\/li>\n<li>v: V\u1eadn t\u1ed1c d\u00f2ng ch\u1ea3y (m\/s)<\/li>\n<li>D: \u0110\u01b0\u1eddng k\u00ednh \u0111\u1eb7c tr\u01b0ng c\u1ee7a \u1ed1ng (m)<\/li>\n<li>\\(\\mu\\): \u0110\u1ed9 nh\u1edbt \u0111\u1ed9ng h\u1ecdc c\u1ee7a ch\u1ea5t l\u1ecfng (Pa.s ho\u1eb7c N.s\/m<sup>2<\/sup>)<\/li>\n<\/ul>\n<h2>C\u00e1ch Truy\u1ec1n Nhi\u1ec7t Trong D\u00f2ng Ch\u1ea3y T\u1ea7ng<\/h2>\n<p>Trong d\u00f2ng ch\u1ea3y t\u1ea7ng, s\u1ef1 truy\u1ec1n nhi\u1ec7t ch\u00ednh di\u1ec5n ra qua s\u1ef1 d\u1eabn nhi\u1ec7t gi\u1eefa c\u00e1c l\u1edbp ch\u1ea5t l\u1ecfng. C\u00f4ng th\u1ee9c \u0111\u1ec3 t\u00ednh s\u1ef1 truy\u1ec1n nhi\u1ec7t qua m\u1ed9t \u1ed1ng tr\u00f2n \u0111\u01b0\u1ee3c m\u00f4 ph\u1ecfng d\u01b0\u1edbi d\u1ea1ng ph\u01b0\u01a1ng tr\u00ecnh Nusselt nh\u01b0 sau:<\/p>\n<p>Nu = 3.66 (\u0111\u1ed1i v\u1edbi m\u1ed9t \u1ed1ng tr\u01a1n, d\u00e0i)<\/p>\n<p>\u1ede \u0111\u00e2y:<\/p>\n<ul>\n<li>Nu: S\u1ed1 Nusselt, l\u00e0 t\u1ef7 l\u1ec7 c\u1ee7a s\u1ef1 d\u1eabn nhi\u1ec7t \u0111\u1ed1i v\u1edbi s\u1ef1 \u0111\u1ed1i l\u01b0u nhi\u1ec7t<\/li>\n<\/ul>\n<p>H\u1ec7 s\u1ed1 truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ednh t\u1eeb s\u1ed1 Nusselt theo c\u00f4ng th\u1ee9c:<\/p>\n<p>h = \\(\\frac{Nu \\cdot k}{D}\\)<\/p>\n<p>V\u1edbi:<\/p>\n<ul>\n<li>h: H\u1ec7 s\u1ed1 truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u (W\/m<sup>2<\/sup>.K)<\/li>\n<li>k: H\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t c\u1ee7a ch\u1ea5t l\u1ecfng (W\/m.K)<\/li>\n<\/ul>\n<h2>\u1ee8ng D\u1ee5ng Th\u1ef1c Ti\u1ec5n<\/h2>\n<p>D\u00f2ng ch\u1ea3y t\u1ea7ng v\u00e0 truy\u1ec1n nhi\u1ec7t \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt nh\u01b0:<\/p>\n<ol>\n<li>H\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t \u0111\u1ed9ng c\u01a1<\/li>\n<li>Thi\u1ebft k\u1ebf b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t<\/li>\n<li>H\u1ec7 th\u1ed1ng s\u01b0\u1edfi \u1ea5m v\u00e0 \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed<\/li>\n<\/ol>\n<p>Vi\u1ec7c hi\u1ec3u v\u00e0 \u1ee9ng d\u1ee5ng hi\u1ec7u qu\u1ea3 c\u00e1c nguy\u00ean t\u1eafc truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y t\u1ea7ng gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng trong c\u00e1c h\u1ec7 th\u1ed1ng k\u1ef9 thu\u1eadt.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y t\u1ea7ng: t\u00ecm hi\u1ec3u c\u01a1 ch\u1ebf truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea5t l\u1ecfng, c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng v\u00e0 \u1ee9ng d\u1ee5ng trong c\u00f4ng nghi\u1ec7p.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[132],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v15.4 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y t\u1ea7ng<\/title>\n<meta name=\"description\" content=\"Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y t\u1ea7ng: t\u00ecm hi\u1ec3u c\u01a1 ch\u1ebf truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea5t l\u1ecfng, c\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng v\u00e0 \u1ee9ng d\u1ee5ng trong c\u00f4ng nghi\u1ec7p.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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