{"id":688752,"date":"2024-08-20T03:47:18","date_gmt":"2024-08-20T02:47:18","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=688752"},"modified":"2024-08-20T03:47:18","modified_gmt":"2024-08-20T02:47:18","slug":"chat-long-treo-do-nhot-giam-chan-cac-loai","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/chat-long-treo-do-nhot-giam-chan-cac-loai\/","title":{"rendered":"Ch\u1ea5t L\u1ecfng Treo | \u0110\u1ed9 Nh\u1edbt, Gi\u1ea3m Ch\u1ea5n &#038; C\u00e1c Lo\u1ea1i"},"content":{"rendered":"<p class=\"sidekick\">Ch\u1ea5t l\u1ecfng treo trong k\u1ef9 thu\u1eadt nhi\u1ec7t: T\u00ecm hi\u1ec3u v\u1ec1 \u0111\u1ed9 nh\u1edbt, ch\u1ee9c n\u0103ng gi\u1ea3m ch\u1ea5n v\u00e0 c\u00e1c lo\u1ea1i ch\u1ea5t l\u1ecfng treo ph\u1ed5 bi\u1ebfn trong c\u00e1c \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt v\u00e0 c\u00f4ng nghi\u1ec7p.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/chat_long_treo_do_nhot_giam_chan_cac_loai.png\" alt=\"Ch\u1ea5t L\u1ecfng Treo | \u0110\u1ed9 Nh\u1edbt, Gi\u1ea3m Ch\u1ea5n &#038; C\u00e1c Lo\u1ea1i\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>Ch\u1ea5t L\u1ecfng Treo | \u0110\u1ed9 Nh\u1edbt, Gi\u1ea3m Ch\u1ea5n &#038; C\u00e1c Lo\u1ea1i<\/h2>\n<p>Trong l\u0129nh v\u1ef1c <b>k\u1ef9 thu\u1eadt nhi\u1ec7t<\/b>, ch\u1ea5t l\u1ecfng treo \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng t\u1eeb c\u00f4ng nghi\u1ec7p \u0111\u1ebfn \u0111\u1eddi s\u1ed1ng h\u00e0ng ng\u00e0y. C\u00e1c \u0111\u1eb7c t\u00ednh ch\u00ednh nh\u01b0 \u0111\u1ed9 nh\u1edbt, kh\u1ea3 n\u0103ng gi\u1ea3m ch\u1ea5n v\u00e0 c\u00e1c lo\u1ea1i ch\u1ea5t l\u1ecfng treo c\u1ee5 th\u1ec3 s\u1ebd \u0111\u01b0\u1ee3c tr\u00ecnh b\u00e0y chi ti\u1ebft d\u01b0\u1edbi \u0111\u00e2y.<\/p>\n<h2>\u0110\u1ed9 Nh\u1edbt<\/h2>\n<p>\u0110\u1ed9 nh\u1edbt l\u00e0 m\u1ed9t \u0111\u1eb7c t\u00ednh v\u1eadt l\u00fd \u0111\u1ecbnh ngh\u0129a m\u1ee9c \u0111\u1ed9 tr\u1edf l\u1ef1c c\u1ee7a ch\u1ea5t l\u1ecfng \u0111\u1ed1i v\u1edbi s\u1ef1 chuy\u1ec3n \u0111\u1ed9ng c\u1ee7a b\u1ea3n th\u00e2n n\u00f3 ho\u1eb7c v\u1eadt ch\u1ea5t kh\u00e1c trong n\u00f3. \u0110\u1ed9 nh\u1edbt cao ngh\u0129a l\u00e0 ch\u1ea5t l\u1ecfng r\u1ea5t &#8220;d\u00ednh&#8221; v\u00e0 s\u1ebd ch\u1ea3y ch\u1eadm, trong khi \u0111\u1ed9 nh\u1edbt th\u1ea5p ngh\u0129a l\u00e0 ch\u1ea5t l\u1ecfng d\u1ec5 d\u00e0ng ch\u1ea3y v\u00e0 \u00edt d\u00ednh h\u01a1n.<\/p>\n<ul>\n<li><i>V\u00ed d\u1ee5:<\/i> M\u1eadt ong c\u00f3 \u0111\u1ed9 nh\u1edbt cao h\u01a1n n\u01b0\u1edbc.<\/li>\n<\/ul>\n<p>C\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9 nh\u1edbt theo ph\u01b0\u01a1ng tr\u00ecnh Newton:<\/p>\n<math >\n  <mrow>\n    <mtext>\u0110\u1ed9 nh\u1edbt (<\/mtext>\n    <mi>&eta;<\/mi>\n    <mtext>) = <\/mtext>\n    <mfrac>\n      <mrow>\n        <mo>&tau;<\/mo>\n      <\/mrow>\n      <mrow>\n        <mo>&#x2202;<\/mo>\n        <mi>u<\/mi>\n        <mo>\/<\/mo>\n        <mo>&#x2202;<\/mo>\n        <mi>y<\/mi>\n      <\/mrow>\n    <\/mfrac>\n  <\/mrow>\n<\/math>\n<p>Trong \u0111\u00f3, &tau; l\u00e0 s\u1ee9c kh\u00e1ng c\u1eaft (shear stress) v\u00e0 &#038;frac(&#x2202;u \/ &#x2202;y), gradient v\u1eadn t\u1ed1c.<\/p>\n<h2>Gi\u1ea3m Ch\u1ea5n<\/h2>\n<p>Ch\u1ea5t l\u1ecfng treo c\u0169ng c\u00f3 t\u00e1c d\u1ee5ng gi\u1ea3m ch\u1ea5n, ngh\u0129a l\u00e0 ch\u00fang c\u00f3 th\u1ec3 h\u1ea5p th\u1ee5 v\u00e0 ti\u00eau t\u00e1n n\u0103ng l\u01b0\u1ee3ng t\u1eeb c\u00e1c chuy\u1ec3n \u0111\u1ed9ng dao \u0111\u1ed9ng ho\u1eb7c rung \u0111\u1ed9ng. Gi\u1ea3m ch\u1ea5n n\u00e0y r\u1ea5t quan tr\u1ecdng trong c\u00e1c h\u1ec7 th\u1ed1ng nh\u01b0 \u00f4 t\u00f4, h\u1ec7 th\u1ed1ng treo v\u00e0 thi\u1ebft b\u1ecb c\u01a1 kh\u00ed \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o b\u1ec1n v\u1eefng v\u00e0 ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh.<\/p>\n<ul>\n<li>V\u00ed d\u1ee5: D\u1ea7u d\u00f9ng trong gi\u1ea3m ch\u1ea5n c\u1ee7a h\u1ec7 th\u1ed1ng treo xe h\u01a1i gi\u00fap gi\u1ea3m rung \u0111\u1ed9ng khi di chuy\u1ec3n qua c\u00e1c \u0111o\u1ea1n \u0111\u01b0\u1eddng g\u1ed3 gh\u1ec1.<\/li>\n<\/ul>\n<h2>C\u00e1c Lo\u1ea1i Ch\u1ea5t L\u1ecfng Treo<\/h2>\n<h3>1. Ch\u1ea5t L\u1ecfng Newton<\/h3>\n<ul>\n<li>\u0110\u1ecbnh ngh\u0129a: C\u00e1c ch\u1ea5t l\u1ecfng c\u00f3 \u0111\u1ed9 nh\u1edbt kh\u00f4ng thay \u0111\u1ed5i theo t\u1ed1c \u0111\u1ed9 c\u1eaft.<\/li>\n<li>V\u00ed d\u1ee5: N\u01b0\u1edbc, d\u1ea7u kho\u00e1ng.<\/li>\n<\/ul>\n<h3>2. Ch\u1ea5t L\u1ecfng Kh\u00f4ng Newton<\/h3>\n<ul>\n<li>\u0110\u1ecbnh ngh\u0129a: C\u00e1c ch\u1ea5t l\u1ecfng c\u00f3 \u0111\u1ed9 nh\u1edbt thay \u0111\u1ed5i khi t\u1ed1c \u0111\u1ed9 c\u1eaft thay \u0111\u1ed5i.<\/li>\n<li>C\u00e1c lo\u1ea1i:\n<ul>\n<li>Ch\u1ea5t l\u1ecfng d\u1ebbo (Pseudoplastic): \u0110\u1ed9 nh\u1edbt gi\u1ea3m khi t\u1ed1c \u0111\u1ed9 c\u1eaft t\u0103ng, v\u00ed d\u1ee5: s\u01a1n, s\u1eefa chua.<\/li>\n<li>Ch\u1ea5t l\u1ecfng gi\u00e3n n\u1edf (Dilatant): \u0110\u1ed9 nh\u1edbt t\u0103ng khi t\u1ed1c \u0111\u1ed9 c\u1eaft t\u0103ng, v\u00ed d\u1ee5: huy\u1ec1n ph\u00f9 tinh b\u1ed9t.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>3. Ch\u1ea5t L\u1ecfng Thixotropic<\/h3>\n<ul>\n<li>\u0110\u1ecbnh ngh\u0129a: \u0110\u1ed9 nh\u1edbt c\u1ee7a ch\u1ea5t l\u1ecfng n\u00e0y gi\u1ea3m theo th\u1eddi gian d\u01b0\u1edbi t\u00e1c d\u1ee5ng c\u1eaft li\u00ean t\u1ee5c.<\/li>\n<li>V\u00ed d\u1ee5: Gel, nh\u1ef1a \u0111\u01b0\u1eddng.<\/li>\n<\/ul>\n<p>Hi\u1ec3u r\u00f5 v\u1ec1 c\u00e1c lo\u1ea1i ch\u1ea5t l\u1ecfng treo v\u00e0 \u0111\u1eb7c t\u00ednh c\u1ee7a ch\u00fang gi\u00fap ch\u00fang ta \u1ee9ng d\u1ee5ng ch\u00fang m\u1ed9t c\u00e1ch ch\u00ednh x\u00e1c trong c\u00e1c ng\u00e0nh c\u00f4ng nghi\u1ec7p v\u00e0 k\u1ef9 thu\u1eadt. \u0110i\u1ec1u n\u00e0y kh\u00f4ng ch\u1ec9 n\u00e2ng cao hi\u1ec7u su\u1ea5t l\u00e0m vi\u1ec7c c\u1ee7a m\u00e1y m\u00f3c m\u00e0 c\u00f2n gi\u00fap ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 chi ph\u00ed.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ch\u1ea5t l\u1ecfng treo trong k\u1ef9 thu\u1eadt nhi\u1ec7t: T\u00ecm hi\u1ec3u v\u1ec1 \u0111\u1ed9 nh\u1edbt, ch\u1ee9c n\u0103ng gi\u1ea3m ch\u1ea5n v\u00e0 c\u00e1c lo\u1ea1i ch\u1ea5t l\u1ecfng treo ph\u1ed5 bi\u1ebfn trong c\u00e1c \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt v\u00e0 c\u00f4ng nghi\u1ec7p.<\/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>Ch\u1ea5t L\u1ecfng Treo | \u0110\u1ed9 Nh\u1edbt, Gi\u1ea3m Ch\u1ea5n &amp; C\u00e1c Lo\u1ea1i<\/title>\n<meta name=\"description\" content=\"Ch\u1ea5t l\u1ecfng treo trong k\u1ef9 thu\u1eadt nhi\u1ec7t: T\u00ecm hi\u1ec3u v\u1ec1 \u0111\u1ed9 nh\u1edbt, ch\u1ee9c n\u0103ng gi\u1ea3m ch\u1ea5n v\u00e0 c\u00e1c lo\u1ea1i ch\u1ea5t l\u1ecfng treo ph\u1ed5 bi\u1ebfn trong c\u00e1c \u1ee9ng d\u1ee5ng k\u1ef9 thu\u1eadt v\u00e0 c\u00f4ng nghi\u1ec7p.\" \/>\n<meta name=\"robots\" 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