<\/span><\/h2>\nH\u1ec7 s\u1ed1 nh\u1edbt c\u1ee7a d\u1ea7u nh\u1eddn <\/b>th\u01b0\u1eddng \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 \u0111\u1ed9 nh\u1edbt, m\u1ed9t \u0111\u1eb7c t\u00ednh quan tr\u1ecdng c\u1ee7a d\u1ea7u nh\u1eddn. N\u00f3 \u0111o l\u01b0\u1eddng kh\u1ea3 n\u0103ng c\u1ee7a d\u1ea7u nh\u1eddn ch\u1ed1ng l\u1ea1i s\u1ef1 tr\u00f4i qua nhanh ch\u00f3ng gi\u1eefa c\u00e1c b\u1ed9 ph\u1eadn \u0111\u1ed9ng c\u01a1 khi ch\u00fang ti\u1ebfp x\u00fac. H\u1ec7 s\u1ed1 nh\u1edbt x\u00e1c \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9 \u0111\u1eb7c ho\u1eb7c l\u1ecfng c\u1ee7a d\u1ea7u, l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng trong vi\u1ec7c b\u1ea3o v\u1ec7 v\u00e0 b\u1ea3o d\u01b0\u1ee1ng \u0111\u1ed9ng c\u01a1 xe h\u01a1i.<\/span><\/p>\n\u0110\u01a1n v\u1ecb th\u00f4ng th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 \u0111o l\u01b0\u1eddng h\u1ec7 s\u1ed1 nh\u1edbt l\u00e0 “cSt” (centistoke). <\/span>H\u1ec7 s\u1ed1 nh\u1edbt c\u1ee7a d\u1ea7u nh\u1eddn<\/b> \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn nhi\u1ec1u kh\u00eda c\u1ea1nh quan tr\u1ecdng c\u1ee7a ho\u1ea1t \u0111\u1ed9ng c\u1ee7a \u0111\u1ed9ng c\u01a1, bao g\u1ed3m kh\u1ea3 n\u0103ng b\u1ea3o v\u1ec7 b\u1ec1 m\u1eb7t b\u1ed9 ph\u1eadn \u0111\u1ed9ng c\u01a1, hi\u1ec7u su\u1ea5t nhi\u00ean li\u1ec7u, kh\u1ea3 n\u0103ng ho\u1ea1t \u0111\u1ed9ng c\u1ee7a d\u1ea7u nh\u1eddn \u1edf c\u00e1c nhi\u1ec7t \u0111\u1ed9 kh\u00e1c nhau. Vi\u1ec7c ch\u1ecdn d\u1ea7u nh\u1eddn v\u1edbi h\u1ec7 s\u1ed1 nh\u1edbt ph\u00f9 h\u1ee3p r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o \u0111\u1ed9ng c\u01a1 ho\u1ea1t \u0111\u1ed9ng hi\u1ec7u qu\u1ea3, b\u1ec1n b\u1ec9.<\/span><\/p>\n<\/p>\n
<\/span>II. M\u1ed9t s\u1ed1 c\u00f4ng th\u1ee9c t\u00ednh h\u1ec7 s\u1ed1 nh\u1edbt c\u1ee7a d\u1ea7u nh\u1eddn<\/b><\/span><\/h2>\nH\u1ec7 s\u1ed1 nh\u1edbt c\u1ee7a d\u1ea7u nh\u1eddn<\/b> th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111o b\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng c\u00e1c c\u00f4ng th\u1ee9c ho\u1eb7c ph\u01b0\u01a1ng ph\u00e1p th\u00ed nghi\u1ec7m. C\u00f3 m\u1ed9t s\u1ed1 c\u00f4ng th\u1ee9c ph\u1ed5 bi\u1ebfn \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 t\u00ednh h\u1ec7 s\u1ed1 nh\u1edbt c\u1ee7a d\u1ea7u nh\u1eddn:<\/span><\/p>\n<\/span>C\u00f4ng th\u1ee9c Kinematic Viscosity<\/b><\/span><\/h3>\n\u0110\u00e2y l\u00e0 c\u00f4ng th\u1ee9c ph\u1ed5 bi\u1ebfn \u0111\u1ec3 t\u00ednh \u0111\u1ed9 nh\u1edbt kinematic (\u0111o l\u01b0\u1eddng \u0111\u1ed9 nh\u1edbt d\u1ef1a tr\u00ean t\u1ed1c \u0111\u1ed9 tr\u00f4i qua c\u1ee7a d\u1ea7u). C\u00f4ng th\u1ee9c t\u00ednh nh\u01b0 sau:<\/span><\/p>\nH\u1ec7 s\u1ed1 nh\u1edbt kinematik (\u03bd) = \u0110\u1ed9 nh\u1edbt \u0111\u1ed9ng c\u01a1 (cSt) \/ M\u1eadt \u0111\u1ed9 (g\/cm\u00b3)<\/span><\/p>\n<\/span>C\u00f4ng th\u1ee9c Dynamic Viscosity<\/b><\/span><\/h3>\n\u0110\u1ed9 nh\u1edbt \u0111\u1ed9ng c\u01a1 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong nhi\u1ec1u tr\u01b0\u1eddng h\u1ee3p \u0111\u1ec3 \u0111o l\u01b0\u1eddng \u0111\u1ed9 nh\u1edbt t\u0129nh c\u1ee7a d\u1ea7u nh\u1eddn. C\u00f4ng th\u1ee9c t\u00ednh \u0111\u1ed9 nh\u1edbt \u0111\u1ed9ng nh\u01b0 sau:<\/span><\/p>\nH\u1ec7 s\u1ed1 nh\u1edbt \u0111\u1ed9ng (\u03b7) = H\u1ec7 s\u1ed1 nh\u1edbt kinematik (\u03bd) x M\u1eadt \u0111\u1ed9 (\u03c1)<\/span><\/p>\n<\/span>C\u00f4ng th\u1ee9c Saybolt Universal Viscosity (SUS)<\/b><\/span><\/h3>\n\u0110\u00e2y l\u00e0 m\u1ed9t \u0111\u01a1n v\u1ecb ph\u1ed5 bi\u1ebfn s\u1eed d\u1ee5ng t\u1ea1i M\u1ef9 \u0111\u1ec3 \u0111o l\u01b0\u1eddng \u0111\u1ed9 nh\u1edbt. C\u00f4ng th\u1ee9c t\u00ednh ASUS nh\u01b0 sau:<\/span><\/p>\nSUS = 100,000 \/ H\u1ec7 s\u1ed1 nh\u1edbt kinematik (\u03bd)<\/span><\/p>\n<\/span>C\u00f4ng th\u1ee9c Saybolt Furol Viscosity (SSF)<\/b><\/span><\/h3>\nC\u00f4ng th\u1ee9c n\u00e0y c\u0169ng s\u1eed d\u1ee5ng \u0111\u1ec3 t\u00ednh \u0111\u1ed9 nh\u1edbt t\u01b0\u01a1ng t\u1ef1 SUS, nh\u01b0ng d\u1ef1a tr\u00ean thang \u0111o Saybolt Furol. C\u00f4ng th\u1ee9c t\u00ednh SSF nh\u01b0 sau:<\/span><\/p>\nSSF = 100,000 \/ H\u1ec7 s\u1ed1 nh\u1edbt kinematik (\u03bd)<\/span><\/p>\nL\u01b0u \u00fd r\u1eb1ng c\u00f3 nhi\u1ec1u \u0111\u01a1n v\u1ecb \u0111o l\u01b0\u1eddng kh\u00e1c nhau \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng tr\u00ean kh\u1eafp th\u1ebf gi\u1edbi. C\u00f4ng th\u1ee9c tr\u00ean s\u1eed d\u1ee5ng c\u00e1c \u0111\u01a1n v\u1ecb th\u00f4ng d\u1ee5ng. \u0110\u1ec3 t\u00ednh ch\u00ednh x\u00e1c h\u1ec7 s\u1ed1 nh\u1edbt cho m\u1ed9t lo\u1ea1i d\u1ea7u nh\u1eddn c\u1ee5 th\u1ec3, b\u1ea1n c\u1ea7n bi\u1ebft \u0111\u1ed9 nh\u1edbt \u0111\u1ed9ng c\u01a1 v\u00e0 m\u1eadt \u0111\u1ed9 c\u1ee7a d\u1ea7u \u0111\u00f3, sau \u0111\u00f3 \u00e1p d\u1ee5ng c\u00f4ng th\u1ee9c t\u01b0\u01a1ng \u1ee9ng.<\/span><\/p>\n<\/p>\n
<\/span>III. C\u00e1c y\u1ebfu t\u1ed1 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn h\u1ec7 s\u1ed1 nh\u1edbt c\u1ee7a d\u1ea7u nh\u1eddn<\/b><\/span><\/h2>\nH\u1ec7 s\u1ed1 nh\u1edbt c\u1ee7a d\u1ea7u nh\u1eddn<\/b> \u0111\u01b0\u1ee3c \u1ea3nh h\u01b0\u1edfng b\u1edfi nhi\u1ec1u y\u1ebfu t\u1ed1 kh\u00e1c nhau. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 m\u1ed9t s\u1ed1 y\u1ebfu t\u1ed1 quan tr\u1ecdng m\u00e0 h\u1ec7 s\u1ed1 nh\u1edbt c\u1ee7a d\u1ea7u nh\u1eddn ph\u1ee5 thu\u1ed9c v\u00e0o:<\/span><\/p>\nNhi\u1ec7t \u0111\u1ed9<\/b><\/p>\n
Nhi\u1ec7t \u0111\u1ed9 l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn h\u1ec7 s\u1ed1 nh\u1edbt. D\u1ea7u nh\u1eddn th\u01b0\u1eddng tr\u1edf n\u00ean nh\u1eddn h\u01a1n \u1edf nhi\u1ec7t \u0111\u1ed9 th\u1ea5p, m\u1ecfng h\u01a1n \u1edf nhi\u1ec7t \u0111\u1ed9 cao. Vi\u1ec7c n\u00e0y \u0111\u01b0\u1ee3c m\u00f4 t\u1ea3 b\u1edfi h\u1ec7 s\u1ed1 nh\u1edbt \u0111\u1ed9ng, \u0111\u1ed9 nh\u1edbt kinematic, n\u00f3 th\u01b0\u1eddng \u0111\u01b0\u1ee3c \u0111o \u1edf m\u1ed9t nhi\u1ec7t \u0111\u1ed9 c\u1ed1 \u0111\u1ecbnh, ch\u1eb3ng h\u1ea1n nh\u01b0 40\u00b0C ho\u1eb7c 100\u00b0C.<\/span><\/p>\n\u00c1p su\u1ea5t<\/b><\/p>\n
\u00c1p su\u1ea5t c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn \u0111\u1ed9 nh\u1edbt c\u1ee7a d\u1ea7u nh\u1eddn. Trong c\u00e1c \u1ee9ng d\u1ee5ng n\u01a1i \u00e1p su\u1ea5t cao xu\u1ea5t hi\u1ec7n, d\u1ea7u tr\u1edf n\u00ean \u00edt nh\u1edbt h\u01a1n.<\/span><\/p>\nC\u1ea5u tr\u00fac ph\u00e2n t\u1eed<\/b><\/p>\n
C\u1ea5u tr\u00fac ph\u00e2n t\u1eed c\u1ee7a d\u1ea7u nh\u1eddn, bao g\u1ed3m k\u00edch th\u01b0\u1edbc, h\u00ecnh d\u1ea1ng, tr\u1ecdng l\u01b0\u1ee3ng ph\u00e2n t\u1eed, c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn h\u1ec7 s\u1ed1 nh\u1edbt. D\u1ea7u nh\u1eddn c\u00f3 c\u1ea5u tr\u00fac ph\u00e2n t\u1eed \u0111a d\u1ea1ng, t\u1eeb d\u1ea7u nh\u1eddn \u0111\u01a1n gi\u1ea3n \u0111\u1ebfn d\u1ea7u c\u00f3 ph\u00e2n t\u1eed ph\u1ee9c t\u1ea1p.<\/span><\/p>\nD\u1ea7u c\u01a1 b\u1ea3n<\/b><\/p>\n
Lo\u1ea1i d\u1ea7u c\u01a1 b\u1ea3n (d\u1ea7u g\u1ed1c) s\u1eed d\u1ee5ng \u0111\u1ec3 s\u1ea3n xu\u1ea5t d\u1ea7u nh\u1eddn c\u0169ng c\u00f3 t\u00e1c \u0111\u1ed9ng l\u1edbn \u0111\u1ebfn h\u1ec7 s\u1ed1 nh\u1edbt. D\u1ea7u c\u01a1 b\u1ea3n kh\u00e1c nhau c\u00f3 c\u00e1c t\u00ednh ch\u1ea5t nh\u1edbt kh\u00e1c nhau.<\/span><\/p>\nPh\u1ee5 gia v\u00e0 ch\u1ea5t t\u1ea1o \u0111\u1eb7c<\/b><\/p>\n
S\u1ef1 th\u00eam v\u00e0o c\u1ee7a c\u00e1c ph\u1ee5 gia, ch\u1ea5t t\u1ea1o \u0111\u1eb7c v\u00e0o d\u1ea7u nh\u1eddn thay \u0111\u1ed5i \u0111\u00e1ng k\u1ec3 h\u1ec7 s\u1ed1 nh\u1edbt c\u1ee7a n\u00f3. Ch\u1eb3ng h\u1ea1n, th\u00eam c\u00e1c ph\u1ee5 gia l\u00e0m gi\u1ea3m ma s\u00e1t l\u00e0m cho d\u1ea7u \u00edt nh\u1edbt h\u01a1n.<\/span><\/p>\nS\u1ef1 nhi\u1ec5u lo\u00e3ng, m\u00e0i m\u00f2n<\/b><\/p>\n
S\u1ef1 hi\u1ec7n di\u1ec7n c\u1ee7a b\u1ea5t k\u1ef3 t\u1ea1p ch\u1ea5t, b\u1ee5i b\u1ea9n, ho\u1eb7c c\u00e1c h\u1ea1t r\u1eafn trong d\u1ea7u nh\u1eddn c\u0169ng \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn h\u1ec7 s\u1ed1 nh\u1edbt. Nh\u1eefng t\u1ea1p ch\u1ea5t n\u00e0y c\u00f3 th\u1ec3 l\u00e0m t\u0103ng \u0111\u1ed9 nh\u1edbt,\u00a0 g\u00e2y m\u00e0i m\u00f2n.<\/span><\/p>\nTu\u1ed5i th\u1ecd, s\u1eed d\u1ee5ng tr\u01b0\u1edbc \u0111\u00f3<\/b><\/p>\n
D\u1ea7u nh\u1eddn s\u1ebd thay \u0111\u1ed5i theo th\u1eddi gian, s\u1eed d\u1ee5ng tr\u01b0\u1edbc \u0111\u00f3. \u0110\u1ed9 nh\u1edbt c\u1ee7a d\u1ea7u c\u0169ng b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi qu\u00e1 tr\u00ecnh oxi h\u00f3a v\u00e0 nhi\u1ec7t \u0111\u1ed9 cao trong qu\u00e1 tr\u00ecnh v\u1eadn h\u00e0nh \u0111\u1ed9ng c\u01a1.<\/span><\/p>\nNh\u1eefng y\u1ebfu t\u1ed1 tr\u00ean \u0111\u1ec1u c\u00f3 \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn <\/span>h\u1ec7 s\u1ed1 nh\u1edbt c\u1ee7a d\u1ea7u nh\u1eddn<\/b>, quy\u1ebft \u0111\u1ecbnh c\u00e1ch d\u1ea7u ho\u1ea1t \u0111\u1ed9ng trong h\u1ec7 th\u1ed1ng \u0111\u1ed9ng c\u01a1 ho\u1eb7c m\u00e1y m\u00f3c. \u0110i\u1ec1u quan tr\u1ecdng l\u00e0 ch\u1ecdn d\u1ea7u nh\u1eddn ph\u00f9 h\u1ee3p v\u1edbi y\u00eau c\u1ea7u c\u1ee5 th\u1ec3 c\u1ee7a \u1ee9ng d\u1ee5ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t v\u00e0 b\u1ea3o v\u1ec7 t\u1ed1t nh\u1ea5t cho thi\u1ebft b\u1ecb.<\/span><\/p>\n<\/p>\n
H\u1ec7 s\u1ed1 nh\u1edbt c\u1ee7a d\u1ea7u nh\u1eddn<\/b> l\u00e0 m\u1ed9t y\u1ebfu t\u1ed1 quan tr\u1ecdng trong vi\u1ec7c b\u1ea3o d\u01b0\u1ee1ng v\u00e0 b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 xe h\u01a1i. Vi\u1ec7c ch\u1ecdn d\u1ea7u v\u1edbi h\u1ec7 s\u1ed1 nh\u1edbt ph\u00f9 h\u1ee3p \u0111\u1ea3m b\u1ea3o r\u1eb1ng \u0111\u1ed9ng c\u01a1 ho\u1ea1t \u0111\u1ed9ng \u1ed5n \u0111\u1ecbnh, ti\u1ebft ki\u1ec7m nhi\u00ean li\u1ec7u, b\u1ec1n b\u1ec9. \u0110\u1eebng b\u1ecf qua vi\u1ec7c ki\u1ec3m tra, thay d\u1ea7u nh\u1eddn theo h\u01b0\u1edbng d\u1eabn c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t xe \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng b\u1ea1n \u0111ang b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 xe m\u1ed9t c\u00e1ch t\u1ed1t nh\u1ea5t.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"D\u1ea7u nh\u1eddn l\u00e0 m\u1ed9t ph\u1ea7n quan tr\u1ecdng c\u1ee7a h\u1ec7 th\u1ed1ng b\u1ea3o d\u01b0\u1ee1ng, b\u1ea3o v\u1ec7 \u0111\u1ed9ng c\u01a1 xe h\u01a1i. N\u00f3 \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c gi\u1ea3m ma s\u00e1t, nhi\u1ec7t \u0111\u1ed9 v\u00e0 m\u00e0i m\u00f2n gi\u1eefa c\u00e1c b\u1ed9 ph\u1eadn \u0111\u1ed9ng c\u01a1. M\u1ed9t kh\u00e1i ni\u1ec7m kh\u00f4ng th\u1ec3 thi\u1ebfu khi n\u00f3i v\u1ec1 d\u1ea7u nh\u1eddn l\u00e0 h\u1ec7 s\u1ed1 nh\u1edbt…..<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47,93],"tags":[],"_links":{"self":[{"href":"https:\/\/net-canada.com\/wp-json\/wp\/v2\/posts\/7649"}],"collection":[{"href":"https:\/\/net-canada.com\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/net-canada.com\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/net-canada.com\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/net-canada.com\/wp-json\/wp\/v2\/comments?post=7649"}],"version-history":[{"count":7,"href":"https:\/\/net-canada.com\/wp-json\/wp\/v2\/posts\/7649\/revisions"}],"predecessor-version":[{"id":8050,"href":"https:\/\/net-canada.com\/wp-json\/wp\/v2\/posts\/7649\/revisions\/8050"}],"wp:attachment":[{"href":"https:\/\/net-canada.com\/wp-json\/wp\/v2\/media?parent=7649"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/net-canada.com\/wp-json\/wp\/v2\/categories?post=7649"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/net-canada.com\/wp-json\/wp\/v2\/tags?post=7649"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}