{"id":701906,"date":"2024-10-17T08:55:04","date_gmt":"2024-10-17T07:55:04","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=701906"},"modified":"2024-10-17T08:55:04","modified_gmt":"2024-10-17T07:55:04","slug":"may-phan-tich-do-dan-nhiet-kiem-tra-vat-lieu","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/may-phan-tich-do-dan-nhiet-kiem-tra-vat-lieu\/","title":{"rendered":"M\u00e1y ph\u00e2n t\u00edch \u0111\u1ed9 d\u1eabn nhi\u1ec7t | Ki\u1ec3m tra v\u1eadt li\u1ec7u"},"content":{"rendered":"<p class=\"sidekick\">M\u00e1y ph\u00e2n t\u00edch \u0111\u1ed9 d\u1eabn nhi\u1ec7t: C\u00f4ng c\u1ee5 ki\u1ec3m tra v\u1eadt li\u1ec7u hi\u1ec7u qu\u1ea3, x\u00e1c \u0111\u1ecbnh \u0111\u1eb7c t\u00ednh nhi\u1ec7t c\u00e1c v\u1eadt li\u1ec7u, \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t nhi\u1ec7t trong \u1ee9ng d\u1ee5ng th\u1ef1c t\u1ebf.<\/p>\n<p><img src=\"https:\/\/www.thermal-engineering.org\/wp-content\/uploads\/2024\/07\/may_phan_tich_do_dan_nhiet_kiem_tra_vat_lieu.png\" alt=\"M\u00e1y ph\u00e2n t\u00edch \u0111\u1ed9 d\u1eabn nhi\u1ec7t | Ki\u1ec3m tra v\u1eadt li\u1ec7u\" style=\"display: block; margin-left: auto; margin-right: auto;\"\/><\/p>\n<h2>M\u00e1y Ph\u00e2n T\u00edch \u0110\u1ed9 D\u1eabn Nhi\u1ec7t | Ki\u1ec3m Tra V\u1eadt Li\u1ec7u<\/h2>\n<p>M\u00e1y ph\u00e2n t\u00edch \u0111\u1ed9 d\u1eabn nhi\u1ec7t l\u00e0 m\u1ed9t c\u00f4ng c\u1ee5 quan tr\u1ecdng trong ng\u00e0nh k\u1ef9 thu\u1eadt nhi\u1ec7t, gi\u00fap \u0111o l\u01b0\u1eddng v\u00e0 \u0111\u00e1nh gi\u00e1 kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t c\u1ee7a c\u00e1c v\u1eadt li\u1ec7u. Kh\u1ea3 n\u0103ng n\u00e0y r\u1ea5t quan tr\u1ecdng trong nhi\u1ec1u \u1ee9ng d\u1ee5ng nh\u01b0 x\u00e2y d\u1ef1ng, c\u00f4ng ngh\u1ec7 \u0111i\u1ec7n t\u1eed v\u00e0 c\u00f4ng nghi\u1ec7p \u00f4 t\u00f4.<\/p>\n<h2>\u0110\u1ed9 D\u1eabn Nhi\u1ec7t L\u00e0 G\u00ec?<\/h2>\n<p>\u0110\u1ed9 d\u1eabn nhi\u1ec7t (thermal conductivity) l\u00e0 m\u1ed9t t\u00ednh ch\u1ea5t v\u1eadt li\u1ec7u cho bi\u1ebft kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u \u0111\u00f3. \u0110\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng th\u01b0\u1eddng l\u00e0 W\/m\u00b7K (Watt tr\u00ean m\u00e9t Kelvin). \u0110\u1ed9 d\u1eabn nhi\u1ec7t cao cho th\u1ea5y v\u1eadt li\u1ec7u c\u00f3 kh\u1ea3 n\u0103ng truy\u1ec1n nhi\u1ec7t t\u1ed1t, trong khi \u0111\u1ed9 d\u1eabn nhi\u1ec7t th\u1ea5p cho th\u1ea5y kh\u1ea3 n\u0103ng truy\u1ec1n nhi\u1ec7t k\u00e9m.<\/p>\n<h2>C\u00e1ch Ho\u1ea1t \u0110\u1ed9ng C\u1ee7a M\u00e1y Ph\u00e2n T\u00edch \u0110\u1ed9 D\u1eabn Nhi\u1ec7t<\/h2>\n<p>M\u00e1y ph\u00e2n t\u00edch \u0111\u1ed9 d\u1eabn nhi\u1ec7t ho\u1ea1t \u0111\u1ed9ng b\u1eb1ng c\u00e1ch t\u1ea1o ra m\u1ed9t gradient nhi\u1ec7t \u0111\u1ed9 trong v\u1eadt li\u1ec7u c\u1ea7n \u0111o v\u00e0 \u0111o l\u01b0\u1eddng l\u01b0\u1ee3ng nhi\u1ec7t truy\u1ec1n qua v\u1eadt li\u1ec7u \u0111\u00f3. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p th\u00f4ng d\u1ee5ng bao g\u1ed3m:<\/p>\n<p><u1><\/p>\n<li>Ph\u01b0\u01a1ng ph\u00e1p d\u00f2ng nhi\u1ec7t \u1ed5n \u0111\u1ecbnh (Steady-State Method)<\/li>\n<li>Ph\u01b0\u01a1ng ph\u00e1p d\u00f2ng nhi\u1ec7t bi\u1ebfn \u0111\u1ed5i (Transient Method)<\/li>\n<p><\/u1><\/p>\n<h3>Ph\u01b0\u01a1ng Ph\u00e1p D\u00f2ng Nhi\u1ec7t \u1ed4n \u0110\u1ecbnh<\/h3>\n<p>Ph\u01b0\u01a1ng ph\u00e1p d\u00f2ng nhi\u1ec7t \u1ed5n \u0111\u1ecbnh d\u1ef1a tr\u00ean nguy\u00ean l\u00fd Fourier v\u1ec1 d\u1eabn nhi\u1ec7t, \u0111\u00f3 l\u00e0 l\u01b0\u1ee3ng nhi\u1ec7t truy\u1ec1n qua m\u1ed9t v\u1eadt li\u1ec7u \u1ed5n \u0111\u1ecbnh theo th\u1eddi gian:<\/p>\n<p>Q = -k * A * \\(\\frac{\\Delta T}{\\Delta x}\\)<\/p>\n<p>Trong \u0111\u00f3:<\/p>\n<ul>\n<li>Q: L\u01b0\u1ee3ng nhi\u1ec7t truy\u1ec1n qua (W)<\/li>\n<li>k: \u0110\u1ed9 d\u1eabn nhi\u1ec7t (W\/m\u00b7K)<\/li>\n<li>A: Di\u1ec7n t\u00edch truy\u1ec1n nhi\u1ec7t (m<sup>2<\/sup>)<\/li>\n<li>\\(\\Delta T\\): Ch\u00eanh l\u1ec7ch nhi\u1ec7t \u0111\u1ed9 (K)<\/li>\n<li>\\(\\Delta x\\): \u0110\u1ed9 d\u00e0y c\u1ee7a v\u1eadt li\u1ec7u (m)<\/li>\n<\/ul>\n<h3>Ph\u01b0\u01a1ng Ph\u00e1p D\u00f2ng Nhi\u1ec7t Bi\u1ebfn \u0110\u1ed5i<\/h3>\n<p>Ph\u01b0\u01a1ng ph\u00e1p d\u00f2ng nhi\u1ec7t bi\u1ebfn \u0111\u1ed5i s\u1eed d\u1ee5ng l\u00fd thuy\u1ebft v\u1ec1 ph\u00e2n t\u00e1n nhi\u1ec7t \u0111\u1ec3 t\u00ednh to\u00e1n \u0111\u1ed9 d\u1eabn nhi\u1ec7t. D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c thu th\u1eadp th\u00f4ng qua c\u00e1c c\u1ea3m bi\u1ebfn nhi\u1ec7t v\u00e0 h\u1ec7 th\u1ed1ng \u0111i\u1ec1u khi\u1ec3n ph\u1ee9c t\u1ea1p \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh nhi\u1ec7t \u0111\u1ed9 t\u1ea1i c\u00e1c \u0111i\u1ec3m kh\u00e1c nhau trong v\u1eadt li\u1ec7u theo th\u1eddi gian.<\/p>\n<h2>\u1ee8ng D\u1ee5ng C\u1ee7a M\u00e1y Ph\u00e2n T\u00edch \u0110\u1ed9 D\u1eabn Nhi\u1ec7t<\/h2>\n<p>M\u00e1y ph\u00e2n t\u00edch \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c, bao g\u1ed3m:<\/p>\n<ul>\n<li><b>X\u00e2y d\u1ef1ng:<\/b> \u0110\u00e1nh gi\u00e1 ch\u1ea5t l\u01b0\u1ee3ng c\u00e1ch nhi\u1ec7t c\u1ee7a v\u1eadt li\u1ec7u x\u00e2y d\u1ef1ng nh\u01b0 g\u1ea1ch, xi m\u0103ng v\u00e0 c\u00e1ch nhi\u1ec7t.<\/li>\n<li><b>C\u00f4ng ngh\u1ec7 \u0111i\u1ec7n t\u1eed:<\/b> \u0110\u00e1nh gi\u00e1 v\u1eadt li\u1ec7u t\u1ea3n nhi\u1ec7t cho c\u00e1c thi\u1ebft b\u1ecb \u0111i\u1ec7n t\u1eed nh\u01b0 b\u1ed9 x\u1eed l\u00fd m\u00e1y t\u00ednh v\u00e0 \u0111i\u1ec7n tho\u1ea1i di \u0111\u1ed9ng.<\/li>\n<li><b>Ng\u00e0nh \u00f4 t\u00f4:<\/b> Ki\u1ec3m tra c\u00e1c v\u1eadt li\u1ec7u c\u00e1ch nhi\u1ec7t v\u00e0 h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t trong xe \u00f4 t\u00f4.<\/li>\n<\/ul>\n<h2>K\u1ebft Lu\u1eadn<\/h2>\n<p>M\u00e1y ph\u00e2n t\u00edch \u0111\u1ed9 d\u1eabn nhi\u1ec7t \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c \u0111\u00e1nh gi\u00e1 v\u00e0 l\u1ef1a ch\u1ecdn v\u1eadt li\u1ec7u trong nhi\u1ec1u ng\u00e0nh c\u00f4ng nghi\u1ec7p. N\u00f3 kh\u00f4ng ch\u1ec9 gi\u00fap x\u00e1c \u0111\u1ecbnh ch\u1ea5t l\u01b0\u1ee3ng v\u00e0 hi\u1ec7u su\u1ea5t c\u1ee7a v\u1eadt li\u1ec7u m\u00e0 c\u00f2n \u0111\u00f3ng g\u00f3p v\u00e0o vi\u1ec7c ti\u1ebft ki\u1ec7m n\u0103ng l\u01b0\u1ee3ng v\u00e0 t\u0103ng c\u01b0\u1eddng hi\u1ec7u qu\u1ea3 l\u00e0m vi\u1ec7c c\u1ee7a c\u00e1c s\u1ea3n ph\u1ea9m v\u00e0 c\u00f4ng tr\u00ecnh.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>M\u00e1y ph\u00e2n t\u00edch \u0111\u1ed9 d\u1eabn nhi\u1ec7t: C\u00f4ng c\u1ee5 ki\u1ec3m tra v\u1eadt li\u1ec7u hi\u1ec7u qu\u1ea3, x\u00e1c \u0111\u1ecbnh \u0111\u1eb7c t\u00ednh nhi\u1ec7t c\u00e1c v\u1eadt li\u1ec7u, \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t nhi\u1ec7t trong \u1ee9ng d\u1ee5ng 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 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