{"id":700217,"date":"2024-09-12T22:16:02","date_gmt":"2024-09-12T21:16:02","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=700217"},"modified":"2024-09-12T22:16:02","modified_gmt":"2024-09-12T21:16:02","slug":"truyen-nhiet-trong-lop-hat-kin","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/truyen-nhiet-trong-lop-hat-kin\/","title":{"rendered":"Truy\u1ec1n nhi\u1ec7t trong l\u1edbp h\u1ea1t k\u00edn"},"content":{"rendered":"<p class=\"sidekick\">Truy\u1ec1n nhi\u1ec7t trong l\u1edbp h\u1ea1t k\u00edn: T\u1ed5ng quan v\u1ec1 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p truy\u1ec1n nhi\u1ec7t, c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c ti\u1ec5n trong c\u00f4ng nghi\u1ec7p nhi\u1ec7t.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/truyen_nhiet_trong_lop_hat_kin.png\" alt=\"Truy\u1ec1n nhi\u1ec7t trong l\u1edbp h\u1ea1t k\u00edn\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Truy\u1ec1n Nhi\u1ec7t Trong L\u1edbp H\u1ea1t K\u00edn<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t l\u00e0 qu\u00e1 tr\u00ecnh trao \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t gi\u1eefa c\u00e1c v\u1eadt ho\u1eb7c trong c\u00f9ng m\u1ed9t v\u1eadt. Trong nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc v\u00e0 k\u1ef9 thu\u1eadt nhi\u1ec7t, truy\u1ec1n nhi\u1ec7t \u0111\u00f3ng vai tr\u00f2 r\u1ea5t quan tr\u1ecdng. B\u00e0i vi\u1ebft n\u00e0y s\u1ebd gi\u1edbi thi\u1ec7u v\u1ec1 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t trong l\u1edbp h\u1ea1t k\u00edn, m\u1ed9t hi\u1ec7n t\u01b0\u1ee3ng ph\u1ed5 bi\u1ebfn trong c\u00e1c \u1ee9ng d\u1ee5ng c\u00f4ng nghi\u1ec7p nh\u01b0 s\u1ea5y kh\u00f4, gia nhi\u1ec7t ho\u1eb7c c\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t.<\/p>\n<h2>C\u00e1c C\u01a1 Ch\u1ebf Truy\u1ec1n Nhi\u1ec7t<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t trong l\u1edbp h\u1ea1t k\u00edn c\u00f3 th\u1ec3 di\u1ec5n ra th\u00f4ng qua ba c\u01a1 ch\u1ebf ch\u00ednh:<\/p>\n<ul>\n<li><strong>D\u1eabn nhi\u1ec7t:<\/strong> L\u00e0 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t qua c\u00e1c va ch\u1ea1m ph\u00e2n t\u1eed trong h\u1ea1t v\u1eadt li\u1ec7u. H\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ed1c \u0111\u1ed9 truy\u1ec1n nhi\u1ec7t.<\/li>\n<li><strong>\u0110\u1ed1i l\u01b0u:<\/strong> L\u00e0 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t th\u00f4ng qua s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed bao quanh. Trong l\u1edbp h\u1ea1t k\u00edn, \u0111\u1ed1i l\u01b0u th\u01b0\u1eddng di\u1ec5n ra gi\u1eefa c\u00e1c h\u1ea1t v\u00e0 m\u00f4i tr\u01b0\u1eddng xung quanh ch\u00fang.<\/li>\n<li><strong>B\u1ee9c x\u1ea1:<\/strong> L\u00e0 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t qua s\u00f3ng \u0111i\u1ec7n t\u1eeb, kh\u00f4ng c\u1ea7n c\u00f3 m\u00f4i tr\u01b0\u1eddng v\u1eadt ch\u1ea5t. M\u1ee9c \u0111\u1ed9 b\u1ee9c x\u1ea1 ph\u1ee5 thu\u1ed9c v\u00e0o nhi\u1ec7t \u0111\u1ed9 v\u00e0 t\u00ednh ch\u1ea5t b\u1ec1 m\u1eb7t c\u1ee7a c\u00e1c h\u1ea1t.<\/li>\n<\/ul>\n<h2>Ph\u01b0\u01a1ng Tr\u00ecnh Truy\u1ec1n Nhi\u1ec7t<\/h2>\n<p>H\u1ec7 ph\u01b0\u01a1ng tr\u00ecnh c\u01a1 b\u1ea3n \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh truy\u1ec1n nhi\u1ec7t trong l\u1edbp h\u1ea1t k\u00edn d\u1ef1a v\u00e0o \u0111\u1ecbnh lu\u1eadt Fourrier, \u0111\u1ecbnh lu\u1eadt Newton v\u00e0 c\u00f4ng th\u1ee9c Stefan-Boltzmann:<\/p>\n<ul>\n<li><strong>\u0110\u1ecbnh lu\u1eadt Fourier (D\u1eabn nhi\u1ec7t):<\/strong> \\( q = -k \\cdot \\frac{dT}{dx} \\)<\/li>\n<li><strong>\u0110\u1ecbnh lu\u1eadt Newton (\u0110\u1ed1i l\u01b0u):<\/strong> \\( q = h \\cdot A \\cdot (T_{surface} &#8211; T_{fluid}) \\)<\/li>\n<li><strong>Ph\u01b0\u01a1ng tr\u00ecnh Stefan-Boltzmann (B\u1ee9c x\u1ea1):<\/strong> \\( q = \\epsilon \\cdot \\sigma \\cdot A \\cdot (T^4 &#8211; T_{surrounding}^4) \\)<\/li>\n<\/ul>\n<h2>\u1ee8ng D\u1ee5ng C\u1ee7a Truy\u1ec1n Nhi\u1ec7t Trong L\u1edbp H\u1ea1t K\u00edn<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t trong l\u1edbp h\u1ea1t k\u00edn \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong nhi\u1ec1u l\u0129nh v\u1ef1c c\u00f4ng nghi\u1ec7p:<\/p>\n<ul>\n<li><strong>S\u1ea5y kh\u00f4:<\/strong> C\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p th\u1ef1c ph\u1ea9m, h\u00f3a ch\u1ea5t th\u01b0\u1eddng s\u1eed d\u1ee5ng s\u1ea5y kh\u00f4 \u0111\u1ec3 gi\u1ea3m \u0111\u1ed9 \u1ea9m c\u1ee7a s\u1ea3n ph\u1ea9m.<\/li>\n<li><strong>Gia nhi\u1ec7t:<\/strong> Trong c\u00e1c l\u00f2 nung, gia nhi\u1ec7t \u0111\u1ed3ng \u0111\u1ec1u cho v\u1eadt li\u1ec7u l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 then ch\u1ed1t.<\/li>\n<li><strong>H\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t:<\/strong> Trong c\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t, truy\u1ec1n nhi\u1ec7t trong l\u1edbp h\u1ea1t gi\u00fap ki\u1ec3m so\u00e1t v\u00e0 duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 c\u1ee7a v\u1eadt li\u1ec7u.<\/li>\n<\/ul>\n<p>Trong t\u1ea5t c\u1ea3 c\u00e1c \u1ee9ng d\u1ee5ng n\u00e0y, vi\u1ec7c hi\u1ec3u r\u00f5 c\u00e1c c\u01a1 ch\u1ebf v\u00e0 ph\u01b0\u01a1ng tr\u00ecnh truy\u1ec1n nhi\u1ec7t gi\u00fap k\u1ef9 s\u01b0 t\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh, ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 n\u00e2ng cao ch\u1ea5t l\u01b0\u1ee3ng s\u1ea3n ph\u1ea9m.<\/p>\n<h2>K\u1ebft Lu\u1eadn<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t trong l\u1edbp h\u1ea1t k\u00edn l\u00e0 m\u1ed9t kh\u00eda c\u1ea1nh quan tr\u1ecdng trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t. B\u1eb1ng c\u00e1ch n\u1eafm v\u1eefng c\u00e1c c\u01a1 ch\u1ebf truy\u1ec1n nhi\u1ec7t v\u00e0 ph\u01b0\u01a1ng tr\u00ecnh c\u01a1 b\u1ea3n, ch\u00fang ta c\u00f3 th\u1ec3 \u00e1p d\u1ee5ng hi\u1ec7u qu\u1ea3 c\u00e1c nguy\u00ean l\u00fd n\u00e0y v\u00e0o th\u1ef1c t\u1ebf \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 k\u1ef9 thu\u1eadt v\u00e0 c\u00f4ng nghi\u1ec7p.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Truy\u1ec1n nhi\u1ec7t trong l\u1edbp h\u1ea1t k\u00edn: T\u1ed5ng quan v\u1ec1 c\u00e1c ph\u01b0\u01a1ng ph\u00e1p truy\u1ec1n nhi\u1ec7t, c\u01a1 ch\u1ebf ho\u1ea1t \u0111\u1ed9ng v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c ti\u1ec5n trong c\u00f4ng nghi\u1ec7p nhi\u1ec7t.<\/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 - 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