{"id":699464,"date":"2024-09-20T20:16:20","date_gmt":"2024-09-20T19:16:20","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=699464"},"modified":"2024-09-20T20:16:20","modified_gmt":"2024-09-20T19:16:20","slug":"nghien-cuu-ve-truyen-nhiet-trong-dieu-kien-cryo","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/nghien-cuu-ve-truyen-nhiet-trong-dieu-kien-cryo\/","title":{"rendered":"Nghi\u00ean c\u1ee9u v\u1ec1 truy\u1ec1n nhi\u1ec7t trong \u0111i\u1ec1u ki\u1ec7n cryo"},"content":{"rendered":"<p class=\"sidekick\">Nghi\u00ean c\u1ee9u v\u1ec1 truy\u1ec1n nhi\u1ec7t trong \u0111i\u1ec1u ki\u1ec7n cryo gi\u00fap hi\u1ec3u r\u00f5 c\u01a1 ch\u1ebf truy\u1ec1n nhi\u1ec7t \u1edf nhi\u1ec7t \u0111\u1ed9 c\u1ef1c th\u1ea5p, \u1ee9ng d\u1ee5ng trong c\u00f4ng ngh\u1ec7 v\u00e0 y h\u1ecdc.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/nghien_cuu_ve_truyen_nhiet_trong_dieu_kien_cryo.png\" alt=\"Nghi\u00ean c\u1ee9u v\u1ec1 truy\u1ec1n nhi\u1ec7t trong \u0111i\u1ec1u ki\u1ec7n cryo\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Nghi\u00ean c\u1ee9u v\u1ec1 truy\u1ec1n nhi\u1ec7t trong \u0111i\u1ec1u ki\u1ec7n cryo<\/h2>\n<p>Trong l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t, truy\u1ec1n nhi\u1ec7t l\u00e0 m\u1ed9t ch\u1ee7 \u0111\u1ec1 c\u1ef1c k\u1ef3 quan tr\u1ecdng v\u00e0 ph\u1ee9c t\u1ea1p, \u0111\u1eb7c bi\u1ec7t l\u00e0 khi \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 \u0111\u1ea1t t\u1edbi m\u1ee9c c\u1ef1c k\u1ef3 th\u1ea5p, hay c\u00f2n g\u1ecdi l\u00e0 \u0111i\u1ec1u ki\u1ec7n cryo. Truy\u1ec1n nhi\u1ec7t trong \u0111i\u1ec1u ki\u1ec7n cryo kh\u00f4ng ch\u1ec9 \u00e1p d\u1ee5ng v\u00e0o ng\u00e0nh c\u00f4ng nghi\u1ec7p m\u00e0 c\u00f2n c\u00f3 \u00fd ngh\u0129a l\u1edbn trong nghi\u00ean c\u1ee9u khoa h\u1ecdc, nh\u01b0 l\u0129nh v\u1ef1c v\u1eadt l\u00fd h\u1ea1t nh\u00e2n, y h\u1ecdc, v\u00e0 c\u00f4ng ngh\u1ec7 v\u0169 tr\u1ee5.<\/p>\n<h2>T\u00ednh ch\u1ea5t truy\u1ec1n nhi\u1ec7t trong \u0111i\u1ec1u ki\u1ec7n cryo<\/h2>\n<ul>\n<li><b>\u0110\u1ed9 d\u1eabn nhi\u1ec7t<\/b>: \u0110\u1ed9 d\u1eabn nhi\u1ec7t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u t\u1ea1i nhi\u1ec7t \u0111\u1ed9 r\u1ea5t th\u1ea5p (cryo) c\u00f3 th\u1ec3 thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3 so v\u1edbi \u1edf nhi\u1ec7t \u0111\u1ed9 b\u00ecnh th\u01b0\u1eddng. V\u00ed d\u1ee5, \u0111\u1ed9 d\u1eabn nhi\u1ec7t c\u1ee7a m\u1ed9t s\u1ed1 kim lo\u1ea1i nh\u01b0 \u0111\u1ed3ng ho\u1eb7c nh\u00f4m c\u00f3 th\u1ec3 t\u0103ng l\u00ean do s\u1ef1 gi\u1ea3m \u0111\u1ed9 tr\u1edf kh\u00e1ng \u0111i\u1ec7n.<\/li>\n<li><b>Truy\u1ec1n nhi\u1ec7t qua b\u1ee9c x\u1ea1<\/b>: Truy\u1ec1n nhi\u1ec7t qua b\u1ee9c x\u1ea1 trong \u0111i\u1ec1u ki\u1ec7n cryo c\u00f3 th\u1ec3 b\u1ecb h\u1ea1n ch\u1ebf do m\u1ee9c \u0111\u1ed9 nhi\u1ec7t th\u1ea5p l\u00e0m gi\u1ea3m s\u1ef1 ph\u00e1t x\u1ea1 nhi\u1ec7t.<\/li>\n<li><b>Truy\u1ec1n nhi\u1ec7t qua \u0111\u1ed1i l\u01b0u<\/b>: \u0110\u1ed1i v\u1edbi ch\u1ea5t kh\u00ed \u1edf nhi\u1ec7t \u0111\u1ed9 cryo, hi\u1ec7n t\u01b0\u1ee3ng \u0111\u1ed1i l\u01b0u th\u01b0\u1eddng \u00edt \u0111\u00e1ng k\u1ec3 do m\u1eadt \u0111\u1ed9 kh\u00ed th\u1ea5p \u1edf nhi\u1ec7t \u0111\u1ed9 n\u00e0y, l\u00e0m gi\u1ea3m s\u1ef1 truy\u1ec1n nhi\u1ec7t qua c\u01a1 ch\u1ebf n\u00e0y.<\/li>\n<\/ul>\n<h2>C\u00f4ng ngh\u1ec7 v\u00e0 \u1ee9ng d\u1ee5ng trong \u0111i\u1ec1u ki\u1ec7n cryo<\/h2>\n<p>C\u00e1c \u1ee9ng d\u1ee5ng c\u1ee7a k\u1ef9 thu\u1eadt cryo r\u1ea5t \u0111a d\u1ea1ng, bao g\u1ed3m t\u1eeb l\u01b0u tr\u1eef kh\u00ed h\u00f3a l\u1ecfng t\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m l\u1ea1nh si\u00eau d\u1eabn. Sau \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 v\u00ed d\u1ee5:<\/p>\n<ol>\n<li><b>L\u01b0u tr\u1eef kh\u00ed h\u00f3a l\u1ecfng<\/b>: N\u01b0\u1edbc ng\u01b0ng t\u1ee5 v\u00e0 kh\u00ed h\u00f3a l\u1ecfng nh\u01b0 hydrogen v\u00e0 helium y\u00eau c\u1ea7u \u0111i\u1ec1u ki\u1ec7n cryo \u0111\u1ec3 duy tr\u00ec tr\u1ea1ng th\u00e1i l\u1ecfng. \u0110i\u1ec1u n\u00e0y \u0111\u00f2i h\u1ecfi c\u00e1c h\u1ec7 th\u1ed1ng c\u00e1ch nhi\u1ec7t r\u1ea5t t\u1ed1t \u0111\u1ec3 ng\u0103n ch\u1eb7n s\u1ef1 m\u1ea5t nhi\u1ec7t.<\/li>\n<li><b>C\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m l\u1ea1nh si\u00eau d\u1eabn<\/b>: C\u00e1c v\u1eadt li\u1ec7u si\u00eau d\u1eabn ch\u1ec9 ho\u1ea1t \u0111\u1ed9ng \u1edf nhi\u1ec7t \u0111\u1ed9 c\u1ef1c k\u1ef3 th\u1ea5p, do \u0111\u00f3 vi\u1ec7c l\u00e0m l\u1ea1nh t\u1edbi nhi\u1ec7t \u0111\u1ed9 cryo l\u00e0 c\u1ea7n thi\u1ebft \u0111\u1ec3 duy tr\u00ec tr\u1ea1ng th\u00e1i si\u00eau d\u1eabn.<\/li>\n<li><b>\u1ee8ng d\u1ee5ng trong y h\u1ecdc<\/b>: K\u1ef9 thu\u1eadt cryo \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong ph\u1eabu thu\u1eadt l\u1ea1nh v\u00e0 b\u1ea3o qu\u1ea3n t\u1ebf b\u00e0o v\u00e0 m\u00f4.<\/li>\n<\/ol>\n<h2>C\u00f4ng th\u1ee9c v\u00e0 ph\u01b0\u01a1ng tr\u00ecnh truy\u1ec1n nhi\u1ec7t<\/h2>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh c\u01a1 b\u1ea3n c\u1ee7a truy\u1ec1n nhi\u1ec7t l\u00e0 ph\u01b0\u01a1ng tr\u00ecnh d\u1eabn nhi\u1ec7t Fourier:<\/p>\n<p><b>q<\/b> = -k \\(*\\) \\(\\frac{\\partial T}{\\partial x}\\) <\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li><b>q<\/b>: M\u1eadt \u0111\u1ed9 d\u00f2ng nhi\u1ec7t (W\/m\u00b2)<\/li>\n<li><b>k<\/b>: H\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u (W\/(m\u00b7K))<\/li>\n<li><b>\\(\\frac{\\partial T}{\\partial x}\\)<\/b>: \u0110\u1ed9 bi\u1ebfn thi\u00ean nhi\u1ec7t \u0111\u1ed9 theo chi\u1ec1u d\u00e0i (K\/m)<\/li>\n<\/ul>\n<p>Khi nghi\u00ean c\u1ee9u v\u1ec1 truy\u1ec1n nhi\u1ec7t trong \u0111i\u1ec1u ki\u1ec7n cryo, c\u1ea7n ph\u1ea3i ch\u1ec9nh s\u1eeda ph\u01b0\u01a1ng tr\u00ecnh n\u00e0y \u0111\u1ec3 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c bi\u1ebfn \u0111\u1ed5i nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc t\u1ea1i nhi\u1ec7t \u0111\u1ed9 r\u1ea5t th\u1ea5p. C\u00e1c c\u00f4ng th\u1ee9c ph\u1ee9c t\u1ea1p h\u01a1n nh\u01b0 ph\u01b0\u01a1ng tr\u00ecnh Navier-Stokes v\u00e0 ph\u01b0\u01a1ng tr\u00ecnh n\u0103ng l\u01b0\u1ee3ng c\u0169ng c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 m\u00f4 t\u1ea3 chi ti\u1ebft c\u00e1c qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t v\u00e0 \u0111\u1ed1i l\u01b0u trong \u0111i\u1ec1u ki\u1ec7n cryo.<\/p>\n<h2>K\u1ebft lu\u1eadn<\/h2>\n<p>Nghi\u00ean c\u1ee9u v\u1ec1 truy\u1ec1n nhi\u1ec7t trong \u0111i\u1ec1u ki\u1ec7n cryo l\u00e0 m\u1ed9t l\u0129nh v\u1ef1c th\u00fa v\u1ecb v\u1edbi nhi\u1ec1u \u1ee9ng d\u1ee5ng th\u1ef1c ti\u1ec5n v\u00e0 l\u00fd thuy\u1ebft. Hi\u1ec3u r\u00f5 c\u00e1c c\u01a1 ch\u1ebf truy\u1ec1n nhi\u1ec7t v\u00e0 \u1ee9ng d\u1ee5ng c\u1ee7a n\u00f3 trong \u0111i\u1ec1u ki\u1ec7n n\u00e0y gi\u00fap ch\u00fang ta ph\u00e1t tri\u1ec3n c\u00e1c c\u00f4ng ngh\u1ec7 ti\u00ean ti\u1ebfn h\u01a1n, t\u1eeb \u0111\u00f3 m\u1edf ra nh\u1eefng kh\u1ea3 n\u0103ng m\u1edbi trong khoa h\u1ecdc v\u00e0 k\u1ef9 thu\u1eadt.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nghi\u00ean c\u1ee9u v\u1ec1 truy\u1ec1n nhi\u1ec7t trong \u0111i\u1ec1u ki\u1ec7n cryo gi\u00fap hi\u1ec3u r\u00f5 c\u01a1 ch\u1ebf truy\u1ec1n nhi\u1ec7t \u1edf nhi\u1ec7t \u0111\u1ed9 c\u1ef1c th\u1ea5p, \u1ee9ng d\u1ee5ng trong c\u00f4ng ngh\u1ec7 v\u00e0 y h\u1ecdc.<\/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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