{"id":679549,"date":"2024-10-25T23:03:42","date_gmt":"2024-10-25T22:03:42","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=679549"},"modified":"2024-10-25T23:03:42","modified_gmt":"2024-10-25T22:03:42","slug":"co-the-chenh-lech-nhiet-do-dieu-khien-cac-thiet-bi-vi-long-khong","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/co-the-chenh-lech-nhiet-do-dieu-khien-cac-thiet-bi-vi-long-khong\/","title":{"rendered":"C\u00f3 th\u1ec3 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 \u0111i\u1ec1u khi\u1ec3n c\u00e1c thi\u1ebft b\u1ecb vi l\u1ecfng kh\u00f4ng"},"content":{"rendered":"<p class=\"sidekick\">Ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 \u0111i\u1ec1u khi\u1ec3n c\u00e1c thi\u1ebft b\u1ecb vi l\u1ecfng b\u1eb1ng c\u00e1ch t\u1ea1o ra l\u1ef1c nhi\u1ec7t \u0111\u1ed9ng, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 \u1ee9ng d\u1ee5ng trong c\u00f4ng ngh\u1ec7 hi\u1ec7n \u0111\u1ea1i.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/co_the_chenh_lech_nhiet_do_dieu_khien_cac_thiet_bi_vi_long_khong.png\" alt=\"C\u00f3 th\u1ec3 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 \u0111i\u1ec1u khi\u1ec3n c\u00e1c thi\u1ebft b\u1ecb vi l\u1ecfng kh\u00f4ng\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>C\u00f3 th\u1ec3 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 \u0111i\u1ec1u khi\u1ec3n c\u00e1c thi\u1ebft b\u1ecb vi l\u1ecfng kh\u00f4ng?<\/h2>\n<p>C\u00e1c thi\u1ebft b\u1ecb vi l\u1ecfng (microfluidic devices) l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng trong sinh h\u1ecdc v\u00e0 y h\u1ecdc hi\u1ec7n \u0111\u1ea1i, gi\u00fap th\u1ef1c hi\u1ec7n c\u00e1c ph\u00e2n t\u00edch v\u00e0 th\u00ed nghi\u1ec7m tr\u00ean m\u1ed9t quy m\u00f4 r\u1ea5t nh\u1ecf. M\u1ed9t trong nh\u1eefng ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp c\u1eadn \u0111\u1ec3 \u0111i\u1ec1u khi\u1ec3n d\u00f2ng ch\u1ea3y v\u00e0 v\u1eadn chuy\u1ec3n trong c\u00e1c thi\u1ebft b\u1ecb vi l\u1ecfng l\u00e0 s\u1eed d\u1ee5ng ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9.<\/p>\n<h2>Nguy\u00ean l\u00fd ho\u1ea1t \u0111\u1ed9ng<\/h2>\n<p>Thi\u1ebft b\u1ecb vi l\u1ecfng ho\u1ea1t \u0111\u1ed9ng d\u1ef1a tr\u00ean c\u00e1c nguy\u00ean l\u00fd v\u1eadt l\u00fd kh\u00e1c nhau nh\u01b0 \u0111i\u1ec7n \u0111\u1ed9ng l\u1ef1c h\u1ecdc (electrohydrodynamics), t\u1eeb \u0111\u1ed9ng l\u1ef1c h\u1ecdc (magnetohydrodynamics), v\u00e0 nhi\u1ec7t \u0111\u1ed9ng l\u1ef1c h\u1ecdc (thermohydrodynamics). Trong tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9, nguy\u00ean l\u00fd ch\u00ednh l\u00e0 s\u1ef1 thay \u0111\u1ed5i n\u0103ng l\u01b0\u1ee3ng nhi\u1ec7t c\u00f3 th\u1ec3 t\u1ea1o ra s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a c\u00e1c h\u1ea1t ch\u1ea5t l\u1ecfng.<\/p>\n<h2>\u0110i\u1ec1u khi\u1ec3n d\u00f2ng ch\u1ea3y b\u1eb1ng nhi\u1ec7t \u0111\u1ed9<\/h2>\n<ul>\n<li><strong>Nhi\u1ec7t \u0111\u1ed9 Gradients:<\/strong> Khi c\u00f3 s\u1ef1 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 gi\u1eefa hai v\u00f9ng kh\u00e1c nhau trong m\u1ed9t thi\u1ebft b\u1ecb vi l\u1ecfng, c\u00e1c ph\u00e2n t\u1eed ch\u1ea5t l\u1ecfng s\u1ebd di chuy\u1ec3n t\u1eeb v\u00f9ng nhi\u1ec7t \u0111\u1ed9 cao sang v\u00f9ng nhi\u1ec7t \u0111\u1ed9 th\u1ea5p. Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 d\u00f2ng nhi\u1ec7t \u0111\u1ed9ng l\u1ef1c (thermocapillary flow) ho\u1eb7c hi\u1ec7u \u1ee9ng Marangoni.<\/li>\n<li><strong>S\u1ee9c c\u0103ng b\u1ec1 m\u1eb7t:<\/strong> S\u1ef1 ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 thay \u0111\u1ed5i s\u1ee9c c\u0103ng b\u1ec1 m\u1eb7t c\u1ee7a ch\u1ea5t l\u1ecfng. Khi s\u1ee9c c\u0103ng b\u1ec1 m\u1eb7t thay \u0111\u1ed5i kh\u00f4ng \u0111\u1ec1u, ch\u1ea5t l\u1ecfng s\u1ebd d\u1ecbch chuy\u1ec3n t\u1eeb v\u00f9ng c\u00f3 s\u1ee9c c\u0103ng b\u1ec1 m\u1eb7t th\u1ea5p \u0111\u1ebfn v\u00f9ng c\u00f3 s\u1ee9c c\u0103ng b\u1ec1 m\u1eb7t cao, t\u1ea1o ra s\u1ef1 di chuy\u1ec3n c\u1ee7a ch\u1ea5t l\u1ecfng.<\/li>\n<\/ul>\n<h2>\u1ee8ng d\u1ee5ng trong th\u1ef1c t\u1ebf<\/h2>\n<p>Nh\u1eefng \u1ee9ng d\u1ee5ng c\u1ee5 th\u1ec3 c\u1ee7a vi\u1ec7c \u0111i\u1ec1u khi\u1ec3n thi\u1ebft b\u1ecb vi l\u1ecfng b\u1eb1ng ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 bao g\u1ed3m:<\/p>\n<ol>\n<li><strong>\u0110i\u1ec1u khi\u1ec3n l\u1ea5y m\u1eabu v\u00e0 tr\u1ed9n:<\/strong> Ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u1ea5y m\u1eabu v\u00e0 tr\u1ed9n c\u00e1c ch\u1ea5t trong thi\u1ebft b\u1ecb vi l\u1ecfng, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c x\u00e9t nghi\u1ec7m y h\u1ecdc hay ph\u00e2n t\u00edch h\u00f3a h\u1ecdc.<\/li>\n<li><strong>\u0110i\u1ec1u khi\u1ec3n c\u1ea5u tr\u00fac:<\/strong> Trong qu\u00e1 tr\u00ecnh ch\u1ebf t\u1ea1o c\u00e1c vi c\u1ea7u (microspheres) hay vi h\u1ea1t (microcapsules), ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 \u0111i\u1ec1u khi\u1ec3n k\u00edch th\u01b0\u1edbc v\u00e0 h\u00ecnh d\u1ea1ng c\u1ee7a ch\u00fang.<\/li>\n<\/ol>\n<h2>Th\u00e1ch th\u1ee9c v\u00e0 tri\u1ec3n v\u1ecdng<\/h2>\n<p>M\u1eb7c d\u00f9 vi\u1ec7c s\u1eed d\u1ee5ng ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 mang l\u1ea1i nhi\u1ec1u l\u1ee3i \u00edch, nh\u01b0ng c\u0169ng \u0111i k\u00e8m v\u1edbi nh\u1eefng th\u00e1ch th\u1ee9c. V\u00ed d\u1ee5:<\/p>\n<ul>\n<li>Vi\u1ec7c ki\u1ec3m so\u00e1t ch\u00ednh x\u00e1c nhi\u1ec7t \u0111\u1ed9 tr\u00ean quy m\u00f4 nh\u1ecf l\u00e0 r\u1ea5t kh\u00f3 kh\u0103n.<\/li>\n<li>S\u1ef1 kh\u00f4ng \u0111\u1ed3ng nh\u1ea5t v\u1ec1 nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn s\u1ef1 kh\u00f4ng \u1ed5n \u0111\u1ecbnh trong d\u00f2ng ch\u1ea3y.<\/li>\n<\/ul>\n<p>Tuy nhi\u00ean, v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n kh\u00f4ng ng\u1eebng c\u1ee7a c\u00f4ng ngh\u1ec7, kh\u1ea3 n\u0103ng \u0111i\u1ec1u khi\u1ec3n c\u00e1c thi\u1ebft b\u1ecb vi l\u1ecfng b\u1eb1ng ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 h\u1ee9a h\u1eb9n s\u1ebd m\u1edf ra nhi\u1ec1u c\u01a1 h\u1ed9i m\u1edbi trong nghi\u00ean c\u1ee9u v\u00e0 \u1ee9ng d\u1ee5ng th\u1ef1c ti\u1ec5n.<\/p>\n<p>K\u1ebft lu\u1eadn l\u1ea1i, ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 \u0111i\u1ec1u khi\u1ec3n c\u00e1c thi\u1ebft b\u1ecb vi l\u1ecfng m\u1ed9t c\u00e1ch h\u1eefu hi\u1ec7u, khi bi\u1ebft t\u1eadn d\u1ee5ng \u0111\u00fang nguy\u00ean l\u00fd v\u1eadt l\u00fd v\u00e0 c\u00f4ng ngh\u1ec7 \u0111i\u1ec1u ch\u1ec9nh nhi\u1ec7t \u0111\u1ed9 hi\u1ec7n \u0111\u1ea1i. Vi\u1ec7c n\u00e0y kh\u00f4ng ch\u1ec9 gi\u00fap c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb vi l\u1ecfng m\u00e0 c\u00f2n m\u1edf ra nhi\u1ec1u c\u01a1 h\u1ed9i s\u00e1ng t\u1ea1o trong c\u00e1c l\u0129nh v\u1ef1c y h\u1ecdc, sinh h\u1ecdc v\u00e0 h\u00f3a h\u1ecdc.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 c\u00f3 th\u1ec3 \u0111i\u1ec1u khi\u1ec3n c\u00e1c thi\u1ebft b\u1ecb vi l\u1ecfng b\u1eb1ng c\u00e1ch t\u1ea1o ra l\u1ef1c nhi\u1ec7t \u0111\u1ed9ng, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 \u1ee9ng d\u1ee5ng trong c\u00f4ng ngh\u1ec7 hi\u1ec7n \u0111\u1ea1i.<\/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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