{"id":699770,"date":"2024-09-24T04:07:19","date_gmt":"2024-09-24T03:07:19","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=699770"},"modified":"2024-09-24T04:07:19","modified_gmt":"2024-09-24T03:07:19","slug":"truyen-nhiet-trong-dong-chay-da-pha","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/truyen-nhiet-trong-dong-chay-da-pha\/","title":{"rendered":"Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y \u0111a pha"},"content":{"rendered":"<p class=\"sidekick\">Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y \u0111a pha: Gi\u1ea3i th\u00edch nguy\u00ean l\u00fd truy\u1ec1n nhi\u1ec7t, t\u1ea7m quan tr\u1ecdng v\u00e0 \u1ee9ng d\u1ee5ng trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t \u0111\u1ed9ng v\u00e0 c\u00f4ng nghi\u1ec7p.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/truyen_nhiet_trong_dong_chay_da_pha.png\" alt=\"Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y \u0111a pha\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Truy\u1ec1n Nhi\u1ec7t Trong D\u00f2ng Ch\u1ea3y \u0110a Pha<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y \u0111a pha l\u00e0 m\u1ed9t l\u0129nh v\u1ef1c quan tr\u1ecdng trong ng\u00e0nh c\u00f4ng nghi\u1ec7p v\u00e0 nghi\u00ean c\u1ee9u k\u1ef9 thu\u1eadt nhi\u1ec7t. D\u00f2ng ch\u1ea3y \u0111a pha bao g\u1ed3m hai ho\u1eb7c nhi\u1ec1u pha kh\u00e1c nhau nh\u01b0 kh\u00ed-l\u1ecfng, l\u1ecfng-l\u1ecfng, ho\u1eb7c r\u1eafn-l\u1ecfng. Vi\u1ec7c hi\u1ec3u r\u00f5 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y \u0111a pha gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng nhi\u1ec7t v\u00e0 quy tr\u00ecnh c\u00f4ng nghi\u1ec7p.<\/p>\n<h2>C\u00e1c Ph\u01b0\u01a1ng Th\u1ee9c Truy\u1ec1n Nhi\u1ec7t<\/h2>\n<p>Trong d\u00f2ng ch\u1ea3y \u0111a pha, truy\u1ec1n nhi\u1ec7t c\u00f3 th\u1ec3 x\u1ea3y ra qua nhi\u1ec1u ph\u01b0\u01a1ng th\u1ee9c nh\u01b0:<\/p>\n<ul>\n<li>Truy\u1ec1n d\u1eabn (Conduction): Nhi\u1ec7t truy\u1ec1n qua c\u00e1c ph\u00e2n t\u1eed ti\u1ebfp x\u00fac tr\u1ef1c ti\u1ebfp.<\/li>\n<li>\u0110\u1ed1i l\u01b0u (Convection): Nhi\u1ec7t truy\u1ec1n qua ch\u1ea5t l\u01b0u chuy\u1ec3n \u0111\u1ed9ng.<\/li>\n<li>Ph\u00e1t x\u1ea1 (Radiation): Nhi\u1ec7t truy\u1ec1n d\u01b0\u1edbi d\u1ea1ng s\u00f3ng \u0111i\u1ec7n t\u1eeb.<\/li>\n<\/ul>\n<h2>Y\u1ebfu T\u1ed1 \u1ea2nh H\u01b0\u1edfng \u0110\u1ebfn Truy\u1ec1n Nhi\u1ec7t<\/h2>\n<p>C\u00f3 nhi\u1ec1u y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y \u0111a pha, bao g\u1ed3m:<\/p>\n<ul>\n<li>\u0110\u1eb7c t\u00ednh v\u1eadt li\u1ec7u: Kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng.<\/li>\n<li>H\u1ec7 s\u1ed1 \u0111\u1ed1i l\u01b0u: S\u1ef1 m\u00e3nh li\u1ec7t c\u1ee7a d\u00f2ng ch\u1ea3y v\u00e0 h\u1ec7 s\u1ed1 chuy\u1ec3n \u0111\u1ed5i nhi\u1ec7t gi\u1eefa c\u00e1c pha.<\/li>\n<li>H\u1ec7 s\u1ed1 b\u1ee9c x\u1ea1: \u0110\u1ed9 ph\u00e1t x\u1ea1 v\u00e0 h\u1ea5p th\u1ee5 c\u1ee7a c\u00e1c pha.<\/li>\n<\/ul>\n<h2>C\u00f4ng Th\u1ee9c T\u00ednh To\u00e1n<\/h2>\n<p>Vi\u1ec7c t\u00ednh to\u00e1n truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y \u0111a pha th\u01b0\u1eddng ph\u1ee9c t\u1ea1p v\u00e0 \u0111\u00f2i h\u1ecfi s\u1ef1 k\u1ebft h\u1ee3p c\u1ee7a nhi\u1ec1u ph\u01b0\u01a1ng tr\u00ecnh. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 c\u00f4ng th\u1ee9c c\u01a1 b\u1ea3n:<\/p>\n<p><b>\u0110\u1ed1i v\u1edbi truy\u1ec1n d\u1eabn:<\/b><\/p>\n<p style=\"text-align: center;\">q = -k \\frac{dT}{dx}<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>q: L\u01b0u l\u01b0\u1ee3ng nhi\u1ec7t<\/li>\n<li>k: H\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t<\/li>\n<li>\\frac{dT}{dx}: Gradient nhi\u1ec7t \u0111\u1ed9 theo h\u01b0\u1edbng x<\/li>\n<\/ul>\n<p><b>\u0110\u1ed1i v\u1edbi \u0111\u1ed1i l\u01b0u:<\/b><\/p>\n<p style=\"text-align: center;\">q = h A (T_s &#8211; T_\\infty) <\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>q: L\u01b0u l\u01b0\u1ee3ng nhi\u1ec7t<\/li>\n<li>h: H\u1ec7 s\u1ed1 \u0111\u1ed1i l\u01b0u<\/li>\n<li>A: Di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t trao \u0111\u1ed5i nhi\u1ec7t<\/li>\n<li>T_s: Nhi\u1ec7t \u0111\u1ed9 b\u1ec1 m\u1eb7t<\/li>\n<li>T_\\infty: Nhi\u1ec7t \u0111\u1ed9 ch\u1ea5t l\u01b0u xung quanh<\/li>\n<\/ul>\n<h2>\u1ee8ng D\u1ee5ng Th\u1ef1c Ti\u1ec5n<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y \u0111a pha c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u1ef1c ti\u1ec5n nh\u01b0:<\/p>\n<ol>\n<li><b>L\u00f2 ph\u1ea3n \u1ee9ng h\u1ea1t nh\u00e2n:<\/b> Nhi\u1ec7t \u0111\u01b0\u1ee3c truy\u1ec1n t\u1eeb l\u00f5i l\u00f2 ph\u1ea3n \u1ee9ng qua m\u1ed9t h\u1ed7n h\u1ee3p g\u1ed3m n\u01b0\u1edbc v\u00e0 h\u01a1i n\u01b0\u1edbc.<\/li>\n<li><b>C\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m l\u1ea1nh:<\/b> H\u1ec7 th\u1ed1ng \u0111i\u1ec1u h\u00f2a v\u00e0 t\u1ee7 l\u1ea1nh s\u1eed d\u1ee5ng d\u00f2ng ch\u1ea3y c\u1ee7a ch\u1ea5t l\u1ecfng v\u00e0 ch\u1ea5t kh\u00ed \u0111\u1ec3 truy\u1ec1n nhi\u1ec7t.<\/li>\n<li><b>C\u00f4ng nghi\u1ec7p h\u00f3a ch\u1ea5t:<\/b> C\u00e1c qu\u00e1 tr\u00ecnh ph\u1ea3n \u1ee9ng h\u00f3a h\u1ecdc th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn vi\u1ec7c truy\u1ec1n nhi\u1ec7t gi\u1eefa c\u00e1c pha.<\/li>\n<\/ol>\n<h2>K\u1ebft Lu\u1eadn<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y \u0111a pha l\u00e0 m\u1ed9t l\u0129nh v\u1ef1c ph\u1ee9c t\u1ea1p nh\u01b0ng v\u00f4 c\u00f9ng quan tr\u1ecdng. Vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c nguy\u00ean l\u00fd v\u00e0 c\u00f4ng th\u1ee9c li\u00ean quan gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t v\u00e0 an to\u00e0n c\u1ee7a nhi\u1ec1u h\u1ec7 th\u1ed1ng c\u00f4ng nghi\u1ec7p. Hy v\u1ecdng b\u00e0i vi\u1ebft n\u00e0y \u0111\u00e3 cung c\u1ea5p m\u1ed9t c\u00e1i nh\u00ecn t\u1ed5ng quan v\u00e0 d\u1ec5 hi\u1ec3u v\u1ec1 ch\u1ee7 \u0111\u1ec1 n\u00e0y.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y \u0111a pha: Gi\u1ea3i th\u00edch nguy\u00ean l\u00fd truy\u1ec1n nhi\u1ec7t, t\u1ea7m quan tr\u1ecdng v\u00e0 \u1ee9ng d\u1ee5ng trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t \u0111\u1ed9ng v\u00e0 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 \u0111a pha<\/title>\n<meta name=\"description\" content=\"Truy\u1ec1n nhi\u1ec7t trong d\u00f2ng ch\u1ea3y 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