| 查看: 448 | 回复: 7 | |||
| 当前主题已经存档。 | |||
| 当前只显示满足指定条件的回帖，点击这里查看本话题的所有回帖 | |||
[交流]
viscous dissipation如解解释？
|
|||
| viscous dissipation如解解释？ |
回复此楼» 猜你喜欢
假如你的研究生提出不合理要求
已经有12人回复
-
实验室接单子
已经有7人回复
-
全日制（定向）博士
已经有5人回复
-
萌生出自己或许不适合搞科研的想法，现在跑or等等看？
已经有4人回复
-
Materials Today Chemistry审稿周期
已经有4人回复
-
参与限项
已经有3人回复
-
对氯苯硼酸纯化
已经有3人回复
-
所感
已经有4人回复
-
要不要辞职读博？
已经有7人回复
-
北核录用
已经有3人回复
xhzyyangyang
木虫 (正式写手)
- 应助: 0 (幼儿园)
- 金币: 3687.7
- 红花: 1
- 帖子: 724
- 在线: 4.5小时
- 虫号: 451858
- 注册: 2007-11-05
- 性别: MM
- 专业: 新药研发，申请国家项目资
4楼2007-12-27 21:12:21
lihx_susan
金虫 (正式写手)
- 翻译EPI: 1
- 应助: 3 (幼儿园)
- 金币: 2073.2
- 帖子: 454
- 在线: 33.8小时
- 虫号: 481622
- 注册: 2007-12-18
- 性别: MM
- 专业: 生物化工与食品化工
3楼2007-12-27 16:18:57
5楼2007-12-30 09:27:43
vbxn
木虫 (正式写手)
- 应助: 1 (幼儿园)
- 金币: 11827.3
- 红花: 1
- 帖子: 878
- 在线: 232.2小时
- 虫号: 51040
- 注册: 2004-07-15
- 性别: GG
- 专业: 外国语言
粘性耗散; 粘滞耗散(下面为英文释意）
|
dissipation—(Also called viscous dissipation.) In thermodynamics, the conversion of kinetic energy into internal energy by work done against the viscous stresses. Sometimes the rate of conversion per unit volume is meant. If the Navier–Stokes equations of viscous flow are employed, Rayleigh's mathematical expression for the rate of viscous (or frictional) dissipation per unit volume is where μ is the dynamic viscosity. The Navier–Stokes assumptions thus satisfy the primary requirement of the second law of thermodynamics that the rate of dissipation be positive and the process irreversible. In a turbulent fluid, which the atmosphere usually is, dissipation is the end result of the turbulent scale process, by which kinetic energy is transferred from its originating, or outer, scale to the dissipation scales by nonlinear dynamical interactions. Most dissipation occurs at scales near the Kolmogorov microscale λd, given by where ν is the kinematic viscosity and ε is the rate of energy dissipation per unit mass. See also stress tensor, energy equation. Brunt, D., 1941: Physical and Dynamical Meteorology, 285–286. |
6楼2007-12-30 12:33:47