小样品低温动态传热双相滞后模型的理论分析  

Study on the characteristics of cryogenic dynamic heat transfer for a small sample by dual-phase-lagging model

作　　者：刘红姣[1] 吴锋[1] 

机构地区：[1]武汉工程大学理学院,湖北武汉430074

出　　处：《武汉化工学院学报》2006年第4期86-89,共4页Journal of Wuhan Institute of Chemical Technology

基　　金：湖北省教育厅重点项目(No.2003A010)

摘　　要：采用双相滞后模型描述小样品在过冷液氮中快速运动时的温度分布,并同双曲型模型的结果进行了比较.研究结果表明,双相滞后模型和双曲型模型得到的温度分布的定性规律基本一致,但有定量的差别;当τT/τq=0.1时,DPL模型和C—V模型得到的温降最大相差10℃,当τT/τq=0.001时,DPL模型和C—V模型得到的温度变化并没有明显的区别,当τT/τq=0时,DPL模型退化成C—V模型.对于生物材料而言,其松弛时间τq一般较大,因此对于生物样品的低温动态传热,采用DPL模型比C—V模型在定量上更为精确.The dual-phase- lagging （DPL） model of thermal conduction is used to describe the characteristics of the temperature field when a small sample moves at high speed in a sub cooled liquid nitrogen. The result indictated that, under the provided conditions, the trend of the temperature field from the C-V model agrees with the field from the DPL model, but there are some quantitative differences between them. When,there is 10℃ difference in variation of temperature between DPL model and C-V model. When, there isn＇t obvious difference in variation of temperature between DPL model and C-V model. When, DPL model changes into C-V model. The relaxation time is often long for specimen, so the result from the DPL model is more accurate than that from the C-V model as to the cryogenic dynamic heat transfer for a small sample.

关 键 词：微尺寸 低温 动态导热 双曲型模型 双相滞后模型 

分 类 号：O514[理学—低温物理]