小样品低温动态传热的行波解  

Traveling wave solution of cryogenic dynamic heat transfer for a small sample

作　　者：刘红姣[1] 吴锋[2] 

机构地区：[1]武汉科技大学化工与资源环境学院,湖北武汉430081 [2]武汉化工学院理学院,湖北武汉430074

出　　处：《武汉化工学院学报》2005年第5期90-93,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：研究了小样品在过冷液氮中快速运动时瞬时动态传热特性,根据双曲型热传输理论推导了该系统中温度场的行波解,结果表明小样品的传热明显遵循波的特性;同时导出了无量纲的冷却速率随热马赫数的增加而增加,说明提高小样品的运动速率有利于提高冷却速率.比较了理论和实验温降曲线,两种曲线的一致性,说明按双曲线模型理论计算小样品的低温动态传热是可行的.The characteristics of transient dynamic thermal conduction wave are studied when a small sample moves at high speed in a sub -cooled liquid nitrogen. From the hyperbolic model, we derived the traveling wave solutions of the temperature field in this system indicating the heat transport of small sample follows obvious wave characteristics; and we also derived the dimensionless cooling rate increases as the thermal Mach number increases, whict demonstrates that building up the speed is one effective method to increase the cooling rate. The temperature curve from the calculation agrees well with the curve from the experiments. This addresses that it is reliable to calculation the cryogenic heat of small sample from the hyperbolic model.

关 键 词：小样品 过冷液氮 动态传热 行波解 

分 类 号：O514[理学—低温物理]