{"id":687163,"date":"2024-08-09T19:05:16","date_gmt":"2024-08-09T18:05:16","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=687163"},"modified":"2024-08-09T19:05:16","modified_gmt":"2024-08-09T18:05:16","slug":"mo-hinh-truyen-nhiet-trong-che-bien-thuc-pham","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/mo-hinh-truyen-nhiet-trong-che-bien-thuc-pham\/","title":{"rendered":"M\u00f4 h\u00ecnh truy\u1ec1n nhi\u1ec7t trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m"},"content":{"rendered":"<p class=\"sidekick\">M\u00f4 h\u00ecnh truy\u1ec1n nhi\u1ec7t trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m: Cung c\u1ea5p ki\u1ebfn th\u1ee9c chi ti\u1ebft v\u1ec1 c\u00e1ch th\u1ee9c nhi\u1ec7t \u0111\u01b0\u1ee3c truy\u1ec1n trong qu\u00e1 tr\u00ecnh n\u1ea5u \u0103n v\u00e0 b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/mo_hinh_truyen_nhiet_trong_che_bien_thuc_pham.png\" alt=\"M\u00f4 h\u00ecnh truy\u1ec1n nhi\u1ec7t trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>M\u00f4 h\u00ecnh truy\u1ec1n nhi\u1ec7t trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m<\/h2>\n<p>Trong l\u0129nh v\u1ef1c ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m, truy\u1ec1n nhi\u1ec7t \u0111\u00f3ng vai tr\u00f2 v\u00f4 c\u00f9ng quan tr\u1ecdng. Qu\u00e1 tr\u00ecnh n\u00e0y \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn ch\u1ea5t l\u01b0\u1ee3ng, an to\u00e0n v\u00e0 gi\u00e1 tr\u1ecb dinh d\u01b0\u1ee1ng c\u1ee7a s\u1ea3n ph\u1ea9m. \u0110\u1ec3 hi\u1ec3u r\u00f5 h\u01a1n v\u1ec1 c\u00e1c h\u00ecnh th\u1ee9c truy\u1ec1n nhi\u1ec7t trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m, ch\u00fang ta c\u1ea7n xem x\u00e9t ba h\u00ecnh th\u1ee9c ch\u00ednh: d\u1eabn nhi\u1ec7t, \u0111\u1ed1i l\u01b0u v\u00e0 b\u1ee9c x\u1ea1 nhi\u1ec7t.<\/p>\n<h2>D\u1eabn nhi\u1ec7t<\/h2>\n<p>D\u1eabn nhi\u1ec7t l\u00e0 qu\u00e1 tr\u00ecnh truy\u1ec1n n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t t\u1eeb v\u00f9ng c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao sang v\u00f9ng c\u00f3 nhi\u1ec7t \u0111\u1ed9 th\u1ea5p m\u00e0 kh\u00f4ng c\u00f3 s\u1ef1 di chuy\u1ec3n c\u1ee7a v\u1eadt ch\u1ea5t. Trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m, d\u1eabn nhi\u1ec7t th\u01b0\u1eddng x\u1ea3y ra qua c\u00e1c b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac nh\u01b0 khi n\u01b0\u1edbng b\u00e1nh trong l\u00f2 ho\u1eb7c r\u00e1n th\u1ee9c \u0103n trong ch\u1ea3o.<\/p>\n<ul>\n<li>Ph\u01b0\u01a1ng tr\u00ecnh Fourier cho d\u1eabn nhi\u1ec7t trong m\u1ed9t chi\u1ec1u:<\/li>\n<\/ul>\n<p>\n\\[ q = -k \\frac{dT}{dx} \\]\n<\/p>\n<ul>\n<li><b>q:<\/b> D\u00f2ng nhi\u1ec7t (W\/m\u00b2)<\/li>\n<li><b>k:<\/b> H\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t (W\/m\u00b7K)<\/li>\n<li><b>dT\/dx:<\/b> Gradient nhi\u1ec7t \u0111\u1ed9 (K\/m)<\/li>\n<\/ul>\n<h2>\u0110\u1ed1i l\u01b0u nhi\u1ec7t<\/h2>\n<p>\u0110\u1ed1i l\u01b0u nhi\u1ec7t l\u00e0 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t b\u1eb1ng s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a ch\u1ea5t l\u1ecfng ho\u1eb7c kh\u00ed. Trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m, \u0111\u1ed1i l\u01b0u th\u01b0\u1eddng x\u1ea3y ra khi \u0111un s\u00f4i n\u01b0\u1edbc ho\u1eb7c n\u1ea5u s\u00fap, n\u01a1i nhi\u1ec7t truy\u1ec1n t\u1eeb ngu\u1ed3n nhi\u1ec7t sang ch\u1ea5t l\u1ecfng v\u00e0 \u0111\u01b0\u1ee3c ph\u00e2n ph\u1ed1i \u0111\u1ec1u kh\u1eafp.<\/p>\n<ul>\n<li>Ph\u01b0\u01a1ng tr\u00ecnh c\u01a1 b\u1ea3n c\u1ee7a \u0111\u1ed1i l\u01b0u nhi\u1ec7t:<\/li>\n<\/ul>\n<p>\n\\[ q = h A(T_s &#8211; T_\\infty) \\]\n<\/p>\n<ul>\n<li><b>q:<\/b> D\u00f2ng nhi\u1ec7t (W)<\/li>\n<li><b>h:<\/b> H\u1ec7 s\u1ed1 truy\u1ec1n nhi\u1ec7t \u0111\u1ed1i l\u01b0u (W\/m\u00b2\u00b7K)<\/li>\n<li><b>A:<\/b> Di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac (m\u00b2)<\/li>\n<li><b>T_s:<\/b> Nhi\u1ec7t \u0111\u1ed9 b\u1ec1 m\u1eb7t (K)<\/li>\n<li><b>T_\\infty:<\/b> Nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng xung quanh (K)<\/li>\n<\/ul>\n<h2>B\u1ee9c x\u1ea1 nhi\u1ec7t<\/h2>\n<p>B\u1ee9c x\u1ea1 nhi\u1ec7t l\u00e0 qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t qua s\u1ef1 ph\u00e1t x\u1ea1 c\u1ee7a s\u00f3ng \u0111i\u1ec7n t\u1eeb, th\u01b0\u1eddng li\u00ean quan \u0111\u1ebfn b\u01b0\u1edbc s\u00f3ng h\u1ed3ng ngo\u1ea1i. Trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m, b\u1ee9c x\u1ea1 nhi\u1ec7t c\u00f3 th\u1ec3 th\u1ea5y r\u00f5 khi s\u1eed d\u1ee5ng l\u00f2 vi s\u00f3ng ho\u1eb7c khi th\u1ef1c ph\u1ea9m h\u1ea5p th\u1ee5 n\u0103ng l\u01b0\u1ee3ng t\u1eeb c\u00e1c ngu\u1ed3n s\u00e1ng c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao.<\/p>\n<ul>\n<li>Ph\u01b0\u01a1ng tr\u00ecnh Stefan-Boltzmann cho b\u1ee9c x\u1ea1 nhi\u1ec7t:<\/li>\n<\/ul>\n<p>\n\\[ q = \\sigma \\epsilon A(T_s^4 &#8211; T_\\infty^4) \\]\n<\/p>\n<ul>\n<li><b>q:<\/b> D\u00f2ng nhi\u1ec7t (W)<\/li>\n<li><b>\\sigma:<\/b> H\u1eb1ng s\u1ed1 Stefan-Boltzmann (5.67 \u00d7 10^(-8) W\/m\u00b2\u00b7K^4)<\/li>\n<li><b>\\epsilon:<\/b> H\u1ec7 s\u1ed1 ph\u00e1t x\u1ea1<\/li>\n<li><b>A:<\/b> Di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t b\u1ee9c x\u1ea1 (m\u00b2)<\/li>\n<li><b>T_s:<\/b> Nhi\u1ec7t \u0111\u1ed9 b\u1ec1 m\u1eb7t (K)<\/li>\n<li><b>T_\\infty:<\/b> Nhi\u1ec7t \u0111\u1ed9 m\u00f4i tr\u01b0\u1eddng xung quanh (K)<\/li>\n<\/ul>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Hi\u1ec3u r\u00f5 v\u1ec1 c\u00e1c m\u00f4 h\u00ecnh truy\u1ec1n nhi\u1ec7t trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m kh\u00f4ng ch\u1ec9 gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u qu\u1ea3 c\u1ee7a qu\u00e1 tr\u00ecnh ch\u1ebf bi\u1ebfn m\u00e0 c\u00f2n \u0111\u1ea3m b\u1ea3o s\u1ea3n ph\u1ea9m \u0111\u1ea1t ch\u1ea5t l\u01b0\u1ee3ng t\u1ed1t nh\u1ea5t. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p d\u1eabn nhi\u1ec7t, \u0111\u1ed1i l\u01b0u v\u00e0 b\u1ee9c x\u1ea1 nhi\u1ec7t \u0111\u1ec1u c\u00f3 vai tr\u00f2 ri\u00eang v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3 trong vi\u1ec7c n\u1ea5u \u0103n v\u00e0 b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m. B\u1eb1ng vi\u1ec7c \u00e1p d\u1ee5ng \u0111\u00fang c\u00e1ch, ng\u01b0\u1eddi ch\u1ebf bi\u1ebfn c\u00f3 th\u1ec3 t\u1ea1o ra nh\u1eefng m\u00f3n \u0103n ngon, an to\u00e0n v\u00e0 b\u1ed5 d\u01b0\u1ee1ng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>M\u00f4 h\u00ecnh truy\u1ec1n nhi\u1ec7t trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m: Cung c\u1ea5p ki\u1ebfn th\u1ee9c chi ti\u1ebft v\u1ec1 c\u00e1ch th\u1ee9c nhi\u1ec7t \u0111\u01b0\u1ee3c truy\u1ec1n trong qu\u00e1 tr\u00ecnh n\u1ea5u \u0103n v\u00e0 b\u1ea3o qu\u1ea3n th\u1ef1c ph\u1ea9m.<\/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>M\u00f4 h\u00ecnh truy\u1ec1n nhi\u1ec7t trong ch\u1ebf bi\u1ebfn th\u1ef1c ph\u1ea9m<\/title>\n<meta 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