{"id":691288,"date":"2024-10-09T13:22:51","date_gmt":"2024-10-09T12:22:51","guid":{"rendered":"https:\/\/www.thermal-engineering.org\/?p=691288"},"modified":"2024-10-09T13:22:51","modified_gmt":"2024-10-09T12:22:51","slug":"khi-helium-mat-do-thap-dan-nhiet-ung-dung","status":"publish","type":"post","link":"https:\/\/www.thermal-engineering.org\/vi\/khi-helium-mat-do-thap-dan-nhiet-ung-dung\/","title":{"rendered":"Kh\u00ed Helium | M\u1eadt \u0110\u1ed9 Th\u1ea5p, D\u1eabn Nhi\u1ec7t & \u1ee8ng D\u1ee5ng"},"content":{"rendered":"

Kh\u00ed Helium: T\u00ecm hi\u1ec3u v\u1ec1 m\u1eadt \u0111\u1ed9 th\u1ea5p, kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t v\u01b0\u1ee3t tr\u1ed9i v\u00e0 nh\u1eefng \u1ee9ng d\u1ee5ng quan tr\u1ecdng trong c\u00f4ng nghi\u1ec7p v\u00e0 c\u00f4ng ngh\u1ec7.<\/p>\n

\"Kh\u00ed<\/p>\n

Kh\u00ed Helium | M\u1eadt \u0110\u1ed9 Th\u1ea5p, D\u1eabn Nhi\u1ec7t & \u1ee8ng D\u1ee5ng<\/h2>\n

Kh\u00ed helium (He) l\u00e0 m\u1ed9t nguy\u00ean t\u1ed1 v\u00f4 c\u00f9ng \u0111\u1ed9c \u0111\u00e1o v\u1edbi nhi\u1ec1u \u0111\u1eb7c t\u00ednh th\u00fa v\u1ecb, l\u00e0m cho n\u00f3 tr\u1edf n\u00ean quan tr\u1ecdng trong nhi\u1ec1u l\u0129nh v\u1ef1c k\u1ef9 thu\u1eadt nhi\u1ec7t. Trong b\u00e0i vi\u1ebft n\u00e0y, ch\u00fang ta s\u1ebd kh\u00e1m ph\u00e1 m\u1eadt \u0111\u1ed9 th\u1ea5p, kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t c\u1ee7a helium v\u00e0 c\u00e1c \u1ee9ng d\u1ee5ng ph\u1ed5 bi\u1ebfn c\u1ee7a n\u00f3.<\/p>\n

M\u1eadt \u0110\u1ed9 Th\u1ea5p<\/h3>\n

M\u1ed9t trong nh\u1eefng \u0111\u1eb7c t\u00ednh n\u1ed5i b\u1eadt c\u1ee7a helium l\u00e0 m\u1eadt \u0111\u1ed9 r\u1ea5t th\u1ea5p. V\u1edbi kh\u1ed1i l\u01b0\u1ee3ng ph\u00e2n t\u1eed ch\u1ec9 l\u00e0 4.0026 g\/mol, helium l\u00e0 m\u1ed9t trong nh\u1eefng kh\u00ed nh\u1eb9 nh\u1ea5t sau hydrogen. Trong \u0111i\u1ec1u ki\u1ec7n ti\u00eau chu\u1ea9n (0\u00b0C v\u00e0 1 atm), m\u1eadt \u0111\u1ed9 c\u1ee7a helium kho\u1ea3ng 0.1785 kg\/m3<\/sup>. Ch\u00ednh \u0111\u1ed9 nh\u1eb9 n\u00e0y l\u00e0m cho helium tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn l\u00fd t\u01b0\u1edfng cho c\u00e1c \u1ee9ng d\u1ee5ng c\u1ea7n kh\u00ed nh\u1eb9, v\u00ed d\u1ee5 nh\u01b0 b\u01a1m b\u00f3ng bay v\u00e0 kh\u00ed c\u1ea7u.<\/p>\n

Kh\u1ea3 N\u0103ng D\u1eabn Nhi\u1ec7t<\/h3>\n

Helium c\u0169ng c\u00f3 kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t cao. \u1ede \u0111i\u1ec1u ki\u1ec7n nhi\u1ec7t \u0111\u1ed9 v\u00e0 \u00e1p su\u1ea5t ti\u00eau chu\u1ea9n, h\u1ec7 s\u1ed1 d\u1eabn nhi\u1ec7t (thermal conductivity) c\u1ee7a helium l\u00e0 kho\u1ea3ng 0.151 W\/(m\u00b7K). S\u1ef1 d\u1eabn nhi\u1ec7t cao n\u00e0y l\u00e0 k\u1ebft qu\u1ea3 c\u1ee7a vi\u1ec7c c\u00e1c ph\u00e2n t\u1eed helium c\u00f3 th\u1ec3 di chuy\u1ec3n r\u1ea5t nhanh, gi\u00fap truy\u1ec1n nhi\u1ec7t hi\u1ec7u qu\u1ea3. \u0110i\u1ec1u n\u00e0y \u0111\u01b0\u1ee3c \u1ee9ng d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m l\u1ea1nh v\u00e0 l\u00e0m m\u00e1t.<\/p>\n

\u1ee8ng D\u1ee5ng c\u1ee7a Helium<\/h3>\n

<\/p>\n

  • B\u01a1m Kh\u00ed C\u1ea7u:<\/b> Do m\u1eadt \u0111\u1ed9 th\u1ea5p, helium th\u01b0\u1eddng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 b\u01a1m kh\u00ed c\u1ea7u, gi\u00fap ch\u00fang bay l\u01a1 l\u1eedng trong kh\u00f4ng kh\u00ed m\u00e0 kh\u00f4ng g\u00e2y nguy hi\u1ec3m nh\u01b0 hydrogen.<\/li>\n
  • L\u00e0m M\u00e1t:<\/b> Helium \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng l\u00e0m m\u00e1t cho nam ch\u00e2m si\u00eau d\u1eabn (superconducting magnets) trong m\u00e1y MRI v\u00e0 c\u00e1c thi\u1ebft b\u1ecb khoa h\u1ecdc.<\/li>\n
  • H\u00e0n:<\/b> \u1ee8ng d\u1ee5ng trong qu\u00e1 tr\u00ecnh h\u00e0n \u0111\u1ec3 b\u1ea3o v\u1ec7 v\u00f9ng h\u00e0n kh\u1ecfi b\u1ecb oxy h\u00f3a.<\/li>\n
  • Nghi\u00ean C\u1ee9u Khoa H\u1ecdc:<\/b> Helium l\u1ecfng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c nghi\u00ean c\u1ee9u v\u1ec1 nhi\u1ec7t \u0111\u1ed9ng h\u1ecdc v\u00e0 v\u1eadt l\u00fd th\u1ea5p nhi\u1ec7t \u0111\u1ed9.<\/li>\n

    <\/u1><\/p>\n

    K\u1ebft lu\u1eadn, v\u1edbi c\u00e1c \u0111\u1eb7c t\u00ednh v\u01b0\u1ee3t tr\u1ed9i v\u1ec1 m\u1eadt \u0111\u1ed9 th\u1ea5p v\u00e0 kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t, kh\u00ed helium c\u00f3 nhi\u1ec1u \u1ee9ng d\u1ee5ng quan tr\u1ecdng trong c\u00e1c l\u0129nh v\u1ef1c nhi\u1ec7t h\u1ecdc v\u00e0 c\u00f4ng ngh\u1ec7. \u0110i\u1ec1u n\u00e0y gi\u00fap n\u00e2ng cao hi\u1ec7u qu\u1ea3 v\u00e0 an to\u00e0n c\u1ee7a nhi\u1ec1u quy tr\u00ecnh k\u1ef9 thu\u1eadt v\u00e0 nghi\u00ean c\u1ee9u khoa h\u1ecdc.<\/p>\n","protected":false},"excerpt":{"rendered":"

    Kh\u00ed Helium: T\u00ecm hi\u1ec3u v\u1ec1 m\u1eadt \u0111\u1ed9 th\u1ea5p, kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t v\u01b0\u1ee3t tr\u1ed9i v\u00e0 nh\u1eefng \u1ee9ng d\u1ee5ng quan tr\u1ecdng trong c\u00f4ng nghi\u1ec7p v\u00e0 c\u00f4ng ngh\u1ec7.<\/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":"\nKh\u00ed Helium | M\u1eadt \u0110\u1ed9 Th\u1ea5p, D\u1eabn Nhi\u1ec7t & \u1ee8ng D\u1ee5ng<\/title>\n<meta name=\"description\" content=\"Kh\u00ed Helium: T\u00ecm hi\u1ec3u v\u1ec1 m\u1eadt \u0111\u1ed9 th\u1ea5p, kh\u1ea3 n\u0103ng d\u1eabn nhi\u1ec7t v\u01b0\u1ee3t tr\u1ed9i v\u00e0 nh\u1eefng \u1ee9ng d\u1ee5ng quan tr\u1ecdng trong c\u00f4ng nghi\u1ec7p v\u00e0 c\u00f4ng ngh\u1ec7.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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