{"id":708246,"date":"2024-10-12T01:54:21","date_gmt":"2024-10-12T00:54:21","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=708246"},"modified":"2024-10-12T01:54:21","modified_gmt":"2024-10-12T00:54:21","slug":"so-reynolds-trong-dong-chay-chat-long-la-gi","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/so-reynolds-trong-dong-chay-chat-long-la-gi\/","title":{"rendered":"S\u1ed1 Reynolds trong D\u00f2ng Ch\u1ea3y Ch\u1ea5t L\u1ecfng L\u00e0 G\u00ec?"},"content":{"rendered":"<p class=\"sidekick\">S\u1ed1 Reynolds trong d\u00f2ng ch\u1ea3y ch\u1ea5t l\u1ecfng l\u00e0 g\u00ec? T\u00ecm hi\u1ec3u v\u1ec1 ch\u1ec9 s\u1ed1 Reynolds \u0111\u1ec3 hi\u1ec3u c\u00e1ch x\u00e1c \u0111\u1ecbnh lo\u1ea1i d\u00f2ng ch\u1ea3y: t\u1ea7ng, r\u1ed1i v\u00e0 \u1ee9ng d\u1ee5ng trong th\u1ef1c t\u1ebf.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/so_reynolds_trong_dong_chay_chat_long_la_gi.png\" alt=\"S\u1ed1 Reynolds trong D\u00f2ng Ch\u1ea3y Ch\u1ea5t L\u1ecfng L\u00e0 G\u00ec?\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>S\u1ed1 Reynolds trong D\u00f2ng Ch\u1ea3y Ch\u1ea5t L\u1ecfng L\u00e0 G\u00ec?<\/h2>\n<p>S\u1ed1 Reynolds (Re) l\u00e0 m\u1ed9t \u0111\u1ea1i l\u01b0\u1ee3ng quan tr\u1ecdng trong c\u01a1 h\u1ecdc ch\u1ea5t l\u1ecfng, gi\u00fap ch\u00fang ta hi\u1ec3u \u0111\u01b0\u1ee3c b\u1ea3n ch\u1ea5t c\u1ee7a d\u00f2ng ch\u1ea3y ch\u1ea5t l\u1ecfng, li\u1ec7u n\u00f3 l\u00e0 d\u00f2ng ch\u1ea3y t\u1ea7ng hay d\u00f2ng ch\u1ea3y r\u1ed1i. N\u00f3 \u0111\u01b0\u1ee3c \u0111\u1eb7t theo t\u00ean c\u1ee7a Osborne Reynolds, ng\u01b0\u1eddi \u0111\u00e3 kh\u00e1m ph\u00e1 ra nguy\u00ean l\u00fd n\u00e0y v\u00e0o cu\u1ed1i th\u1ebf k\u1ef7 19. <\/p>\n<p>S\u1ed1 Reynolds \u0111\u01b0\u1ee3c t\u00ednh b\u1eb1ng c\u00f4ng th\u1ee9c:<\/p>\n<p>\\(Re = \\frac{\\rho v L}{\\mu}\\)<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li><b>\\(\\rho\\)<\/b> l\u00e0 m\u1eadt \u0111\u1ed9 c\u1ee7a ch\u1ea5t l\u1ecfng (kg\/m<sup>3<\/sup>)<\/li>\n<li><b>v<\/b> l\u00e0 v\u1eadn t\u1ed1c d\u00f2ng ch\u1ea3y trung b\u00ecnh c\u1ee7a ch\u1ea5t l\u1ecfng (m\/s)<\/li>\n<li><b>L<\/b> l\u00e0 chi\u1ec1u d\u00e0i \u0111\u1eb7c tr\u01b0ng (m), th\u01b0\u1eddng l\u00e0 \u0111\u01b0\u1eddng k\u00ednh c\u1ee7a \u1ed1ng d\u1eabn d\u00f2ng ch\u1ea3y<\/li>\n<li><b>\\(\\mu\\)<\/b> l\u00e0 \u0111\u1ed9 nh\u1edbt \u0111\u1ed9ng h\u1ecdc c\u1ee7a ch\u1ea5t l\u1ecfng (Ns\/m<sup>2<\/sup> ho\u1eb7c Pa.s)<\/li>\n<\/ul>\n<p>Gi\u00e1 tr\u1ecb c\u1ee7a S\u1ed1 Reynolds x\u00e1c \u0111\u1ecbnh lo\u1ea1i d\u00f2ng ch\u1ea3y:<\/p>\n<ol>\n<li>N\u1ebfu \\(Re < 2000\\), d\u00f2ng ch\u1ea3y l\u00e0 <b>d\u00f2ng ch\u1ea3y t\u1ea7ng<\/b> (laminar flow), t\u1ee9c l\u00e0 d\u00f2ng ch\u1ea3y m\u1ecbn v\u00e0 l\u1edbp ch\u1ea5t l\u1ecfng tr\u01b0\u1ee3t qua nhau m\u1ed9t c\u00e1ch \u0111\u1ed3ng \u0111\u1ec1u.<\/li>\n<li>N\u1ebfu \\(Re > 4000\\), d\u00f2ng ch\u1ea3y l\u00e0 <b>d\u00f2ng ch\u1ea3y r\u1ed1i<\/b> (turbulent flow), t\u1ee9c l\u00e0 d\u00f2ng ch\u1ea3y v\u1edbi nhi\u1ec1u xo\u00e1y v\u00e0 h\u1ed7n lo\u1ea1n.<\/li>\n<li>Gi\u1eefa 2000 v\u00e0 4000, tr\u1ea1ng th\u00e1i d\u00f2ng ch\u1ea3y kh\u00f4ng \u1ed5n \u0111\u1ecbnh v\u00e0 c\u00f3 th\u1ec3 l\u00e0 l\u1edbp ranh gi\u1edbi gi\u1eefa d\u00f2ng ch\u1ea3y t\u1ea7ng v\u00e0 d\u00f2ng ch\u1ea3y r\u1ed1i, g\u1ecdi l\u00e0 <b>d\u00f2ng ch\u1ea3y chuy\u1ec3n ti\u1ebfp<\/b> (transitional flow).<\/li>\n<\/ol>\n<p>Hi\u1ec3u \u0111\u01b0\u1ee3c S\u1ed1 Reynolds kh\u00f4ng ch\u1ec9 quan tr\u1ecdng trong nghi\u00ean c\u1ee9u c\u01a1 h\u1ecdc ch\u1ea5t l\u1ecfng m\u00e0 c\u00f2n r\u1ea5t c\u1ea7n thi\u1ebft trong \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf. V\u00ed d\u1ee5, trong ng\u00e0nh c\u00f4ng nghi\u1ec7p h\u00f3a ch\u1ea5t, vi\u1ec7c ki\u1ec3m so\u00e1t d\u00f2ng ch\u1ea3y t\u1ea7ng v\u00e0 r\u1ed1i c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng l\u1edbn \u0111\u1ebfn qu\u00e1 tr\u00ecnh ph\u1ea3n \u1ee9ng v\u00e0 hi\u1ec7u qu\u1ea3 t\u1ed5ng th\u1ec3. Trong ng\u00e0nh h\u00e0ng kh\u00f4ng, vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a d\u00f2ng ch\u1ea3y t\u1ea7ng tr\u00ean b\u1ec1 m\u1eb7t c\u00e1nh m\u00e1y bay gi\u00fap gi\u1ea3m l\u1ef1c c\u1ea3n v\u00e0 ti\u1ebft ki\u1ec7m nhi\u00ean li\u1ec7u.<\/p>\n<p>Nh\u01b0 v\u1eady, S\u1ed1 Reynolds l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 m\u1ea1nh m\u1ebd gi\u00fap ch\u00fang ta ph\u00e2n t\u00edch v\u00e0 d\u1ef1 \u0111o\u00e1n h\u00e0nh vi c\u1ee7a ch\u1ea5t l\u1ecfng trong c\u00e1c h\u1ec7 th\u1ed1ng kh\u00e1c nhau, t\u1eeb c\u00e1c \u1ed1ng d\u1eabn c\u00f4ng nghi\u1ec7p \u0111\u1ebfn c\u00e1c d\u00f2ng s\u00f4ng t\u1ef1 nhi\u00ean.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>S\u1ed1 Reynolds trong d\u00f2ng ch\u1ea3y ch\u1ea5t l\u1ecfng l\u00e0 g\u00ec? T\u00ecm hi\u1ec3u v\u1ec1 ch\u1ec9 s\u1ed1 Reynolds \u0111\u1ec3 hi\u1ec3u c\u00e1ch x\u00e1c \u0111\u1ecbnh lo\u1ea1i d\u00f2ng ch\u1ea3y: t\u1ea7ng, r\u1ed1i v\u00e0 \u1ee9ng d\u1ee5ng trong th\u1ef1c t\u1ebf.<\/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>S\u1ed1 Reynolds trong D\u00f2ng Ch\u1ea3y Ch\u1ea5t L\u1ecfng L\u00e0 G\u00ec?<\/title>\n<meta name=\"description\" content=\"S\u1ed1 Reynolds trong d\u00f2ng ch\u1ea3y ch\u1ea5t l\u1ecfng l\u00e0 g\u00ec? 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