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热扩散率

传热分析中,热扩散率(符号:,但注意都很常用)是热导率容积热容之比。

其中:

  • 热导率单位:W/(m K))
  • 容积热容(单位:J/(m3K))
  • 密度(单位:kg/(m3))
  • 比热容(单位:J/(kg K))

热扩散率的单位是m2/s。

对于普通的岩石来说, ~ 10-6 m2/s。在300K,空气的热扩散率是0.000024 m2/s。

对于空气的热扩散率与绝对温度之间的关系,参见。

部分材料與物質的熱擴散率 编辑

部分材料與物質的熱擴散率[1]
材質 熱擴散率 (mm2/s) 來源
Pyrolytic graphite, parallel to layers 1220
碳/碳纖維 at 25 °C 216.5 [2]
氦氣 (300 K, 1 atm) 190 [3]
純銀 (99.9%) 165.63
氫氣 (300 K, 1 atm) 160 [3]
127 [4]
at 25 °C 111 [2]
97 [4]
88 [4]
鋁-10矽-錳-鎂 (Silafont 36) at 20 °C 74.2 [5]
6061-T6 鋁合金 64 [4]
(99.95%) at 25 °C 54.3 [6]
鋁-5鎂-2矽-錳 (Magsimal-59) at 20 °C 44.0 [7]
40 [4]
水蒸氣 (1 atm, 400 K) 23.38
23 [4]
氬氣 (300 K, 1 atm) 22 [3]
氮氣 (300 K, 1 atm) 22 [3]
空氣 (300 K) 19 [4]
, AISI 1010 (0.1% carbon) 18.8 [8]
氧化鋁 (polycrystalline) 12.0
, 1% carbon 11.72
Si3N4 with CNTs 26 °C 9.142 [9]
Si3N4 without CNTs 26 °C 8.605 [9]
304不鏽鋼 at 27 °C 4.2 [4]
熱解石墨, normal to layers 3.6
310不鏽鋼 at 25 °C 3.352 [10]
Inconel 600 at 25 °C 3.428 [11]
石英 1.4 [4]
砂岩 1.15
冰 at 0 °C 1.02
二氧化矽 (polycrystalline) 0.83 [4]
磚塊, common 0.52
玻璃窗戶 0.34
磚塊, adobe 0.27
PC塑膠 (polycarbonate) at 25 °C 0.144 [12]
水 at 25 °C 0.143 [12]
PTFE塑膠 (Polytetrafluorethylene) at 25 °C 0.124 [13]
PP塑膠 (polypropylene) at 25 °C 0.096 [12]
尼龍 0.09
橡膠 0.089 - 0.13 [14]
木材 (黃松) 0.082
石蠟 at 25 °C 0.081 [12]
PVC塑膠 (polyvinyl chloride) 0.08 [4]
引擎用油 (saturated liquid, 100 °C) 0.0738
酒精 0.07 [4]


参见 编辑

  1. ^ Brown; Marco. Introduction to Heat Transfer 3rd. McGraw-Hill. 1958.  and Eckert; Drake. Heat and Mass Transfer. McGraw-Hill. 1959. ISBN 978-0-89116-553-8.  cited in Holman, J.P. Heat Transfer 9th. McGraw-Hill. 2002. ISBN 978-0-07-029639-8. 
  2. ^ 2.0 2.1 V. Casalegno; P. Vavassori; M. Valle; M. Ferraris; M. Salvo; G. Pintsuk. Measurement of thermal properties of a ceramic/metal joint by laser flash method. Journal of Nuclear Materials. 2010, 407 (2): 83. Bibcode:2010JNuM..407...83C. doi:10.1016/j.jnucmat.2010.09.032. 
  3. ^ 3.0 3.1 3.2 3.3 Lide, David R. (编). CDC Handbook of Chemistry and Physics 71st. Boston: Chemical Rubber Publishing Company. 1992.  cited in Baierlein, Ralph. Thermal Physics . Cambridge, UK: Cambridge University Press. 1999: 372 [1 December 2011]. ISBN 978-0-521-59082-2. 
  4. ^ 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 4.11 Jim Wilson. Materials Data. August 2007 [2021-11-07]. (原始内容于2021-11-08). 
  5. ^ P. Hofer; E. Kaschnitz. Thermal diffusivity of the aluminium alloy Al-10Si-Mn-Mg (Silafont 36) in the solid and liquid states. High Temperatures – High Pressures. 2011, 40 (3–4): 311 [2021-11-07]. (原始内容于2016-03-04). 
  6. ^ A. Lindemann; J. Blumm. Measurement of the Thermophysical Properties of Pure Molybdenum. 17th Plansee Seminar 3. 2009. 
  7. ^ E. Kaschnitz; M. Küblböck. Thermal diffusivity of the aluminium alloy Al-5Mg-2Si-Mn (Magsimal-59) in the solid and liquid states. High Temperatures – High Pressures. 2008, 37 (3): 221 [2021-11-07]. (原始内容于2016-03-04). 
  8. ^ Lienhard, John H. Lienhard, John H. A Heat Transfer Textbook 5th. Dover Pub. 2019: 715. 
  9. ^ 9.0 9.1 O. Koszor; A. Lindemann; F. Davin; C. Balázsi. Observation of thermophysical and tribological properties of CNT reinforced Si3 N4. Key Engineering Materials. 2009, 409: 354. S2CID 136957396. doi:10.4028/www.scientific.net/KEM.409.354. 
  10. ^ J. Blumm; A. Lindemann; B. Niedrig; R. Campbell. Measurement of Selected Thermophysical Properties of the NPL Certified Reference Material Stainless Steel 310. International Journal of Thermophysics. 2007, 28 (2): 674. Bibcode:2007IJT....28..674B. S2CID 120628607. doi:10.1007/s10765-007-0177-z. 
  11. ^ J. Blumm; A. Lindemann; B. Niedrig. Measurement of the thermophysical properties of an NPL thermal conductivity standard Inconel 600. High Temperatures – High Pressures. 2003–2007, 35/36 (6): 621 [2021-11-07]. doi:10.1068/htjr145. (原始内容于2015-09-24). 
  12. ^ 12.0 12.1 12.2 12.3 J. Blumm; A. Lindemann. Characterization of the thermophysical properties of molten polymers and liquids using the flash technique. High Temperatures – High Pressures. 2003–2007, 35/36 (6): 627. doi:10.1068/htjr144. 
  13. ^ J. Blumm; A. Lindemann; M. Meyer; C. Strasser. Characterization of PTFE Using Advanced Thermal Analysis Technique. International Journal of Thermophysics. 2011, 40 (3–4): 311. Bibcode:2010IJT....31.1919B. S2CID 122020437. doi:10.1007/s10765-008-0512-z. 
  14. ^ 引证错误:没有为名为AJP的参考文献提供内容

热扩散率, 在传热分析中, 符号, displaystyle, alpha, 但注意κ, displaystyle, kappa, displaystyle, 和k, displaystyle, 都很常用, 是热导率与容积热容之比, displaystyle, alpha, over, 其中, displaystyle, 热导率, 单位, displaystyle, 容积热容, 单位, displaystyle, 密度, 单位, displaystyle, 比热容, 单位, 的单位是m2, 对于普通的岩石来说, d. 在传热分析中 热扩散率 符号 a displaystyle alpha 但注意k displaystyle kappa D displaystyle D 和k displaystyle k 都很常用 是热导率与容积热容之比 a k r c p displaystyle alpha k over rho c p 其中 k displaystyle k 热导率 单位 W m K r c p displaystyle rho c p 容积热容 单位 J m3K r displaystyle rho 密度 单位 kg m3 c p displaystyle c p 比热容 单位 J kg K 热扩散率的单位是m2 s 对于普通的岩石来说 a displaystyle alpha 10 6 m2 s 在300K 空气的热扩散率是0 000024 m2 s 对于空气的热扩散率与绝对温度之间的关系 参见 1 部分材料與物質的熱擴散率 编辑部分材料與物質的熱擴散率 1 材質 熱擴散率 mm2 s 來源Pyrolytic graphite parallel to layers 1220碳 碳纖維 at 25 C 216 5 2 氦氣 300 K 1 atm 190 3 純銀 99 9 165 63氫氣 300 K 1 atm 160 3 金 127 4 銅 at 25 C 111 2 鋁 97 4 矽 88 4 鋁 10矽 錳 鎂 Silafont 36 at 20 C 74 2 5 6061 T6 鋁合金 64 4 鉬 99 95 at 25 C 54 3 6 鋁 5鎂 2矽 錳 Magsimal 59 at 20 C 44 0 7 錫 40 4 水蒸氣 1 atm 400 K 23 38鐵 23 4 氬氣 300 K 1 atm 22 3 氮氣 300 K 1 atm 22 3 空氣 300 K 19 4 钢 AISI 1010 0 1 carbon 18 8 8 氧化鋁 polycrystalline 12 0钢 1 carbon 11 72Si3N4 with CNTs 26 C 9 142 9 Si3N4 without CNTs 26 C 8 605 9 304不鏽鋼 at 27 C 4 2 4 熱解石墨 normal to layers 3 6310不鏽鋼 at 25 C 3 352 10 Inconel 600 at 25 C 3 428 11 石英 1 4 4 砂岩 1 15冰 at 0 C 1 02二氧化矽 polycrystalline 0 83 4 磚塊 common 0 52玻璃窗戶 0 34磚塊 adobe 0 27PC塑膠 polycarbonate at 25 C 0 144 12 水 at 25 C 0 143 12 PTFE塑膠 Polytetrafluorethylene at 25 C 0 124 13 PP塑膠 polypropylene at 25 C 0 096 12 尼龍 0 09橡膠 0 089 0 13 14 木材 黃松 0 082石蠟 at 25 C 0 081 12 PVC塑膠 polyvinyl chloride 0 08 4 引擎用油 saturated liquid 100 C 0 0738酒精 0 07 4 参见 编辑热扩散 热容 比热容 热传导方程式 热导率 Brown Marco Introduction to Heat Transfer 3rd McGraw Hill 1958 and Eckert Drake Heat and Mass Transfer McGraw Hill 1959 ISBN 978 0 89116 553 8 cited in Holman J P Heat Transfer 9th McGraw Hill 2002 ISBN 978 0 07 029639 8 2 0 2 1 V Casalegno P Vavassori M Valle M Ferraris M Salvo G Pintsuk Measurement of thermal properties of a ceramic metal joint by laser flash method Journal of Nuclear Materials 2010 407 2 83 Bibcode 2010JNuM 407 83C doi 10 1016 j jnucmat 2010 09 032 3 0 3 1 3 2 3 3 Lide David R 编 CDC Handbook of Chemistry and Physics 71st Boston Chemical Rubber Publishing Company 1992 cited in Baierlein Ralph Thermal Physics nbsp Cambridge UK Cambridge University Press 1999 372 1 December 2011 ISBN 978 0 521 59082 2 含有內容需登入查看的頁面 link 4 00 4 01 4 02 4 03 4 04 4 05 4 06 4 07 4 08 4 09 4 10 4 11 Jim Wilson Materials Data August 2007 2021 11 07 原始内容存档于2021 11 08 P Hofer E Kaschnitz Thermal diffusivity of the aluminium alloy Al 10Si Mn Mg Silafont 36 in the solid and liquid states High Temperatures High Pressures 2011 40 3 4 311 2021 11 07 原始内容存档于2016 03 04 A Lindemann J Blumm Measurement of the Thermophysical Properties of Pure Molybdenum 17th Plansee Seminar 3 2009 E Kaschnitz M Kublbock Thermal diffusivity of the aluminium alloy Al 5Mg 2Si Mn Magsimal 59 in the solid and liquid states High Temperatures High Pressures 2008 37 3 221 2021 11 07 原始内容存档于2016 03 04 Lienhard John H Lienhard John H A Heat Transfer Textbook 5th Dover Pub 2019 715 9 0 9 1 O Koszor A Lindemann F Davin C Balazsi Observation of thermophysical and tribological properties of CNT reinforced Si3 N4 Key Engineering Materials 2009 409 354 S2CID 136957396 doi 10 4028 www scientific net KEM 409 354 J Blumm A Lindemann B Niedrig R Campbell Measurement of Selected Thermophysical Properties of the NPL Certified Reference Material Stainless Steel 310 International Journal of Thermophysics 2007 28 2 674 Bibcode 2007IJT 28 674B S2CID 120628607 doi 10 1007 s10765 007 0177 z J Blumm A Lindemann B Niedrig Measurement of the thermophysical properties of an NPL thermal conductivity standard Inconel 600 High Temperatures High Pressures 2003 2007 35 36 6 621 2021 11 07 doi 10 1068 htjr145 原始内容存档于2015 09 24 12 0 12 1 12 2 12 3 J Blumm A Lindemann Characterization of the thermophysical properties of molten polymers and liquids using the flash technique High Temperatures High Pressures 2003 2007 35 36 6 627 doi 10 1068 htjr144 J Blumm A Lindemann M Meyer C Strasser Characterization of PTFE Using Advanced Thermal Analysis Technique International Journal of Thermophysics 2011 40 3 4 311 Bibcode 2010IJT 31 1919B S2CID 122020437 doi 10 1007 s10765 008 0512 z 引证错误 没有为名为AJP的参考文献提供内容 取自 https zh wikipedia org w index php title 热扩散率 amp oldid 76162447, 维基百科,wiki,书籍,书籍,图书馆,

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