{"id":699598,"date":"2024-10-11T15:16:00","date_gmt":"2024-10-11T14:16:00","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=699598"},"modified":"2024-10-11T15:16:00","modified_gmt":"2024-10-11T14:16:00","slug":"truyen-nhiet-trong-vat-lieu-hang-khong-vu-tru","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/truyen-nhiet-trong-vat-lieu-hang-khong-vu-tru\/","title":{"rendered":"Truy\u1ec1n nhi\u1ec7t trong v\u1eadt li\u1ec7u h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5"},"content":{"rendered":"<p class=\"sidekick\">Truy\u1ec1n nhi\u1ec7t trong v\u1eadt li\u1ec7u h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5: gi\u1ea3i th\u00edch c\u00e1c qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t v\u00e0 c\u00e1ch c\u1ea3i ti\u1ebfn v\u1eadt li\u1ec7u \u0111\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 kh\u1eafc nghi\u1ec7t trong kh\u00f4ng gian.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/truyen_nhiet_trong_vat_lieu_hang_khong_vu_tru.png\" alt=\"Truy\u1ec1n nhi\u1ec7t trong v\u1eadt li\u1ec7u h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Truy\u1ec1n nhi\u1ec7t trong v\u1eadt li\u1ec7u h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5<\/h2>\n<p>Trong ng\u00e0nh h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5, truy\u1ec1n nhi\u1ec7t l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 v\u00f4 c\u00f9ng quan tr\u1ecdng b\u1edfi v\u00ec c\u00e1c thi\u1ebft b\u1ecb v\u00e0 t\u00e0u v\u0169 tr\u1ee5 ph\u1ea3i ch\u1ecbu \u0111\u1ef1ng nh\u1eefng \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 kh\u1eafc nghi\u1ec7t. V\u1eadt li\u1ec7u s\u1eed d\u1ee5ng trong ch\u1ebf t\u1ea1o c\u1ea7n ph\u1ea3i c\u00f3 kh\u1ea3 n\u0103ng truy\u1ec1n nhi\u1ec7t t\u1ed1t \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o an to\u00e0n v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a thi\u1ebft b\u1ecb. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd t\u00ecm hi\u1ec3u v\u1ec1 c\u00e1c h\u00ecnh th\u1ee9c truy\u1ec1n nhi\u1ec7t v\u00e0 c\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u ph\u1ed5 bi\u1ebfn trong ng\u00e0nh n\u00e0y.<\/p>\n<h3>C\u00e1c h\u00ecnh th\u1ee9c truy\u1ec1n nhi\u1ec7t<\/h3>\n<p>C\u00f3 ba h\u00ecnh th\u1ee9c ch\u00ednh c\u1ee7a truy\u1ec1n nhi\u1ec7t trong v\u1eadt li\u1ec7u h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5:<\/p>\n<ul>\n<li><b>D\u1eabn nhi\u1ec7t (Conduction):<\/b> L\u00e0 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t t\u1eeb m\u1ed9t ph\u1ea7n c\u1ee7a v\u1eadt li\u1ec7u n\u00e0y sang ph\u1ea7n kh\u00e1c m\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 di chuy\u1ec3n c\u1ee7a v\u1eadt ch\u1ea5t. Trong c\u00e1c t\u00e0u v\u0169 tr\u1ee5, c\u00e1c b\u1ed9 ph\u1eadn kim lo\u1ea1i th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng v\u00ec ch\u00fang c\u00f3 kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t cao.<\/li>\n<li><b>\u0110\u1ed1i l\u01b0u (Convection):<\/b> L\u00e0 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t qua s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed. Trong kh\u00f4ng gian, do thi\u1ebfu kh\u00f4ng kh\u00ed, \u0111\u1ed1i l\u01b0u t\u1ef1 nhi\u00ean kh\u00f4ng th\u1ec3 x\u1ea3y ra n\u00ean \u0111\u1ed1i l\u01b0u c\u01b0\u1ee1ng b\u1ee9c th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng th\u00f4ng qua c\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t.<\/li>\n<li><b>B\u1ee9c x\u1ea1 (Radiation):<\/b> L\u00e0 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t qua s\u00f3ng \u0111i\u1ec7n t\u1eeb. \u0110\u00e2y l\u00e0 h\u00ecnh th\u1ee9c truy\u1ec1n nhi\u1ec7t ch\u1ee7 y\u1ebfu trong kh\u00f4ng gian v\u00ec kh\u00f4ng c\u00f3 m\u00f4i tr\u01b0\u1eddng \u0111\u1ec3 d\u1eabn nhi\u1ec7t ho\u1eb7c \u0111\u1ed1i l\u01b0u.<\/li>\n<\/ul>\n<h3>V\u1eadt li\u1ec7u s\u1eed d\u1ee5ng trong h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5<\/h3>\n<p>Vi\u1ec7c l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u ph\u1ee5 thu\u1ed9c v\u00e0o kh\u1ea3 n\u0103ng truy\u1ec1n nhi\u1ec7t v\u00e0 ch\u1ecbu nhi\u1ec7t c\u1ee7a ch\u00fang. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 v\u1eadt li\u1ec7u ph\u1ed5 bi\u1ebfn:<\/p>\n<ul>\n<li><b>Nh\u00f4m (Aluminium):<\/b> \u0110\u00e2y l\u00e0 v\u1eadt li\u1ec7u nh\u1eb9, c\u00f3 kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t t\u1ed1t v\u00e0 th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng l\u00e0m v\u1ecf t\u00e0u v\u0169 tr\u1ee5.<\/li>\n<li><b>Th\u00e9p kh\u00f4ng g\u1ec9 (Stainless Steel):<\/b> D\u00f9 n\u1eb7ng h\u01a1n nh\u00f4m, th\u00e9p kh\u00f4ng g\u1ec9 c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t v\u00e0 \u0103n m\u00f2n t\u1ed1t, th\u00edch h\u1ee3p cho c\u00e1c v\u1ecb tr\u00ed quan tr\u1ecdng.<\/li>\n<li><b>Graphite:<\/b> V\u1eadt li\u1ec7u n\u00e0y c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t cao v\u00e0 nh\u1eb9, th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c t\u1ea5m ch\u1eafn nhi\u1ec7t.<\/li>\n<li><b>G\u1ed1m (Ceramics):<\/b> G\u1ed1m c\u00f3 kh\u1ea3 n\u0103ng ch\u1ecbu nhi\u1ec7t c\u1ef1c k\u1ef3 cao v\u00e0 kh\u00f4ng ph\u1ea3n \u1ee9ng v\u1edbi nhi\u1ec1u h\u00f3a ch\u1ea5t.<\/li>\n<li><b>Composites Carbon-Carbon:<\/b> \u0110\u00e2y l\u00e0 lo\u1ea1i v\u1eadt li\u1ec7u \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng ch\u1ee7 y\u1ebfu trong t\u1ea5m ch\u1eafn nhi\u1ec7t c\u1ee7a t\u00e0u con thoi.<\/li>\n<\/ul>\n<h3>C\u00f4ng th\u1ee9c truy\u1ec1n nhi\u1ec7t<\/h3>\n<p>\u0110\u1ec3 t\u00ednh to\u00e1n l\u01b0\u1ee3ng nhi\u1ec7t truy\u1ec1n qua v\u1eadt li\u1ec7u, ta s\u1eed d\u1ee5ng c\u00f4ng th\u1ee9c Fourier cho d\u1eabn nhi\u1ec7t:<\/p>\n<p>\n    \\( q = -k \\cdot A \\cdot \\frac{\\Delta T}{\\Delta x} \\)\n<\/p>\n<p>\n    Trong \u0111\u00f3:<\/p>\n<ul>\n<li>q: L\u01b0\u1ee3ng nhi\u1ec7t truy\u1ec1n qua (W)<\/li>\n<li>k: H\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u (W\/m\u00b7K)<\/li>\n<li>A: Di\u1ec7n t\u00edch m\u1eb7t c\u1eaft ngang qua \u0111\u00f3 nhi\u1ec7t truy\u1ec1n (m<sup>2<\/sup>)<\/li>\n<li>\\(\\Delta T\\): S\u1ef1 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 (K)<\/li>\n<li>\\(\\Delta x\\): Chi\u1ec1u d\u00e0y c\u1ee7a v\u1eadt li\u1ec7u (m)<\/li>\n<\/ul>\n<p>\u1ede tr\u00ean, c\u00e1c gi\u00e1 tr\u1ecb c\u1ee7a \\( k \\) s\u1ebd kh\u00e1c nhau t\u00f9y theo lo\u1ea1i v\u1eadt li\u1ec7u, v\u00e0 \u0111\u00e2y l\u00e0 m\u1ed9t trong nh\u1eefng th\u00f4ng s\u1ed1 quan tr\u1ecdng \u0111\u1ec3 c\u00e1c k\u1ef9 s\u01b0 l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u ph\u00f9 h\u1ee3p cho thi\u1ebft k\u1ebf.<\/p>\n<h3>K\u1ebft lu\u1eadn<\/h3>\n<p>Truy\u1ec1n nhi\u1ec7t trong v\u1eadt li\u1ec7u h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5 l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 then ch\u1ed1t quy\u1ebft \u0111\u1ecbnh hi\u1ec7u su\u1ea5t v\u00e0 s\u1ef1 an to\u00e0n c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb. S\u1ef1 hi\u1ec3u bi\u1ebft v\u1ec1 c\u00e1c nguy\u00ean t\u1eafc truy\u1ec1n nhi\u1ec7t v\u00e0 t\u00ednh ch\u1ea5t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u gi\u00fap cho vi\u1ec7c thi\u1ebft k\u1ebf v\u00e0 ch\u1ebf t\u1ea1o tr\u1edf n\u00ean ch\u00ednh x\u00e1c v\u00e0 hi\u1ec7u qu\u1ea3 h\u01a1n. C\u00e1c k\u1ef9 s\u01b0 v\u00e0 nh\u00e0 nghi\u00ean c\u1ee9u trong ng\u00e0nh n\u00e0y kh\u00f4ng ng\u1eebng ph\u00e1t tri\u1ec3n c\u00e1c lo\u1ea1i v\u1eadt li\u1ec7u m\u1edbi \u0111\u1ec3 \u0111\u00e1p \u1ee9ng y\u00eau c\u1ea7u ng\u00e0y c\u00e0ng cao c\u1ee7a c\u00f4ng ngh\u1ec7 h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Truy\u1ec1n nhi\u1ec7t trong v\u1eadt li\u1ec7u h\u00e0ng kh\u00f4ng v\u0169 tr\u1ee5: gi\u1ea3i th\u00edch c\u00e1c qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t v\u00e0 c\u00e1ch c\u1ea3i ti\u1ebfn v\u1eadt li\u1ec7u \u0111\u1ec3 ch\u1ecbu \u0111\u01b0\u1ee3c nhi\u1ec7t \u0111\u1ed9 kh\u1eafc nghi\u1ec7t trong kh\u00f4ng gian.<\/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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