{"id":699559,"date":"2024-09-24T02:48:09","date_gmt":"2024-09-24T01:48:09","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=699559"},"modified":"2024-09-24T02:48:09","modified_gmt":"2024-09-24T01:48:09","slug":"cac-ky-thuat-tang-cuong-truyen-nhiet-2","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/cac-ky-thuat-tang-cuong-truyen-nhiet-2\/","title":{"rendered":"C\u00e1c k\u1ef9 thu\u1eadt t\u0103ng c\u01b0\u1eddng truy\u1ec1n nhi\u1ec7t"},"content":{"rendered":"<p class=\"sidekick\">K\u1ef9 thu\u1eadt t\u0103ng c\u01b0\u1eddng truy\u1ec1n nhi\u1ec7t: t\u00ecm hi\u1ec3u c\u00e1ch c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t trao \u0111\u1ed5i nhi\u1ec7t trong h\u1ec7 th\u1ed1ng c\u00f4ng nghi\u1ec7p, ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 chi ph\u00ed.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/cac_ky_thuat_tang_cuong_truyen_nhiet.png\" alt=\"C\u00e1c k\u1ef9 thu\u1eadt t\u0103ng c\u01b0\u1eddng truy\u1ec1n nhi\u1ec7t\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>C\u00e1c K\u1ef9 Thu\u1eadt T\u0103ng C\u01b0\u1eddng Truy\u1ec1n Nhi\u1ec7t<\/h2>\n<p>Truy\u1ec1n nhi\u1ec7t l\u00e0 m\u1ed9t trong nh\u1eefng m\u1ea3ng quan tr\u1ecdng c\u1ee7a ng\u00e0nh k\u1ef9 thu\u1eadt nhi\u1ec7t. \u0110\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t l\u00e0m vi\u1ec7c v\u00e0 t\u1ed1i \u01b0u h\u00f3a c\u00e1c qu\u00e1 tr\u00ecnh c\u00f4ng nghi\u1ec7p, c\u00e1c k\u1ef9 thu\u1eadt t\u0103ng c\u01b0\u1eddng truy\u1ec1n nhi\u1ec7t \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng ph\u00f2ng ng\u1eeba s\u1ef1 truy\u1ec1n nhi\u1ec7t kh\u00f4ng hi\u1ec7u qu\u1ea3. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 k\u1ef9 thu\u1eadt ph\u1ed5 bi\u1ebfn:<\/p>\n<p><u1><\/p>\n<li> <strong>C\u00e1c c\u00e1nh t\u1ea3n nhi\u1ec7t<\/strong>: C\u00e1c c\u00e1nh t\u1ea3n nhi\u1ec7t (fins) th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u0103ng di\u1ec7n t\u00edch b\u1ec1 m\u1eb7t ti\u1ebfp x\u00fac, gi\u00fap t\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t \u0111\u01b0\u1ee3c truy\u1ec1n t\u1eeb ho\u1eb7c \u0111\u1ebfn kh\u00f4ng kh\u00ed xung quanh. <\/li>\n<li> <strong>Ch\u1ea5t l\u1ecfng d\u1eabn nhi\u1ec7t t\u1ed1t<\/strong>: S\u1eed d\u1ee5ng c\u00e1c ch\u1ea5t l\u1ecfng c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t cao h\u01a1n gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t truy\u1ec1n nhi\u1ec7t. V\u00ed d\u1ee5, n\u01b0\u1edbc c\u00f3 \u0111\u1ed9 d\u1eabn nhi\u1ec7t cao h\u01a1n so v\u1edbi kh\u00f4ng kh\u00ed, n\u00ean th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t. <\/li>\n<li> <strong>B\u1ec1 m\u1eb7t n\u00e2ng cao<\/strong>: C\u00e1c b\u1ec1 m\u1eb7t thay \u0111\u1ed5i v\u1ec1 h\u00ecnh h\u1ecdc (nh\u01b0 b\u1ec1 m\u1eb7t g\u1ee3n s\u00f3ng, nh\u0103n ho\u1eb7c x\u1ed1p) s\u1ebd t\u1ea1o ra l\u01b0u l\u01b0\u1ee3ng r\u1ed1i trong d\u00f2ng ch\u1ea3y, gi\u00fap t\u0103ng t\u1ef7 l\u1ec7 truy\u1ec1n nhi\u1ec7t. <\/li>\n<li> <strong>\u1ed0ng xo\u1eafn<\/strong>: C\u00e1c \u1ed1ng xo\u1eafn (helix tubes) v\u00e0 c\u00e1c c\u1ea5u tr\u00fac d\u00f2ng ch\u1ea3y xo\u00e1y gi\u00fap t\u0103ng c\u01b0\u1eddng s\u1ef1 khu\u1ea5y \u0111\u1ed9ng trong d\u00f2ng ch\u1ea3y, gi\u00fap truy\u1ec1n nhi\u1ec7t t\u1ed1t h\u01a1n. <\/li>\n<li> <strong>\u00d4n \u0111\u1ecbnh l\u1edbp bi\u00ean<\/strong>: K\u1ef9 thu\u1eadt \u00f4n \u0111\u1ecbnh l\u1edbp bi\u00ean (boundary layer stabilization) l\u00e0m gi\u1ea3m l\u1edbp bi\u00ean d\u00e0y \u0111\u1eb7c, t\u1eeb \u0111\u00f3 t\u0103ng t\u1ed1c \u0111\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t.<\/li>\n<p><\/u1><\/p>\n<h2>Ph\u01b0\u01a1ng Tr\u00ecnh Haven &#8211; Taylor<\/h2>\n<p>Ph\u01b0\u01a1ng tr\u00ecnh Schlichting-Taylor c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n s\u1ef1 truy\u1ec1n nhi\u1ec7t t\u0103ng c\u01b0\u1eddng trong \u1ed1ng xo\u1eafn so v\u1edbi \u1ed1ng th\u1eb3ng:<\/p>\n<p><em>Nu<sub>sp<\/sub> = C * Re<sup>m<\/sup> * Pr<sup>n<\/sup> * f (l\/d)<\/em><\/p>\n<p>\u1ede \u0111\u00e2y:<\/p>\n<p><u1><\/p>\n<li>Nu<sub>sp<\/sub>: Nusselt number \u0111\u1eb7c th\u00f9<\/li>\n<li>C, m, n: H\u1eb1ng s\u1ed1 ph\u1ee5 thu\u1ed9c v\u00e0o h\u00ecnh \u1ea3nh \u1ed1ng<\/li>\n<li>Re: S\u1ed1 Reynolds<\/li>\n<li>Pr: S\u1ed1 Prandtl<\/li>\n<li>f(l\/d): H\u00e0m c\u1ee7a t\u1ef7 s\u1ed1 chi\u1ec1u d\u00e0i\/\u0111\u01b0\u1eddng k\u00ednh<\/li>\n<p><\/u1><\/p>\n<h2>\u1ee8ng D\u1ee5ng<\/h2>\n<ul>\n<li><strong>Ng\u00e0nh c\u00f4ng nghi\u1ec7p h\u00f3a ch\u1ea5t:<\/strong> C\u00e1c l\u00f2 ph\u1ea3n \u1ee9ng v\u00e0 b\u1ed9 trao \u0111\u1ed5i nhi\u1ec7t s\u1eed d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt n\u00e0y \u0111\u1ec3 t\u0103ng c\u01b0\u1eddng hi\u1ec7u su\u1ea5t nhi\u1ec7t, gi\u1ea3m chi ph\u00ed v\u1eadn h\u00e0nh.<\/li>\n<li><strong>Ng\u00e0nh \u0111i\u1ec7n l\u1ea1nh v\u00e0 \u0111i\u1ec1u h\u00f2a kh\u00f4ng kh\u00ed:<\/strong> T\u1eadn d\u1ee5ng c\u00e1c c\u00e1nh t\u1ea3n nhi\u1ec7t v\u00e0 b\u1ec1 m\u1eb7t t\u0103ng c\u01b0\u1eddng \u0111\u1ec3 t\u1ed1i \u01b0u ho\u00e1 qu\u00e1 tr\u00ecnh l\u00e0m m\u00e1t.<\/li>\n<li><strong>Ng\u00e0nh \u00f4 t\u00f4:<\/strong> S\u1eed d\u1ee5ng c\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t t\u0103ng c\u01b0\u1eddng \u0111\u1ec3 duy tr\u00ec nhi\u1ec7t \u0111\u1ed9 \u0111\u1ed9ng c\u01a1 \u1edf m\u1ee9c an to\u00e0n, gi\u00fap k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd \u0111\u1ed9ng c\u01a1.<\/li>\n<\/ul>\n<p>B\u1eb1ng c\u00e1ch l\u1ef1a ch\u1ecdn k\u1ef9 thu\u1eadt ph\u00f9 h\u1ee3p, ch\u00fang ta c\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a qu\u00e1 tr\u00ecnh truy\u1ec1n nhi\u1ec7t, t\u1eeb \u0111\u00f3 n\u00e2ng cao hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng c\u00f4ng nghi\u1ec7p v\u00e0 d\u00e2n d\u1ee5ng.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>K\u1ef9 thu\u1eadt t\u0103ng c\u01b0\u1eddng truy\u1ec1n nhi\u1ec7t: t\u00ecm hi\u1ec3u c\u00e1ch c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t trao \u0111\u1ed5i nhi\u1ec7t trong h\u1ec7 th\u1ed1ng c\u00f4ng nghi\u1ec7p, ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 chi ph\u00ed.<\/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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