液氮冻结管壁温度的分布规律  

The temperature distribution along a freezing pipe wall during liquid nitrogen freezing

作　　者：石荣剑[1] 岳丰田[1] 张勇[1] 陆路[1] 

机构地区：[1]中国矿业大学深部岩土力学与地下工程国家重点实验室力学与建筑工程学院,江苏徐州221008

出　　处：《中国矿业大学学报》2013年第1期12-18,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(41171065);上海市科学技术委员会科研计划项目(10231200400)

摘　　要：分析了冻结管的材质、结构、布置方式、串联方式等不同条件下液氮冻结试验中的管壁温度数据.结果表明:采用传统冻结管结构的液氮冻结中,冻结管口与管底的管壁温度差别较大,在冻结管长度方向上管壁温度成近线性分布;采用在供液管上开孔的冻结管结构,可以有效减少冻结管壁的温差,特别是在供液管底部封堵后,采用较小的开孔间距时,冻结管壁温度分布基本是均匀的;在冻结管串联时,相同深度位置进液管壁温度都低于出气管壁温度,且两者的温差基本一致.液氮灌入量、冻结管材料、结构和连接方式是影响冻结管壁温度分布的主要因素.Data were collected from liquid nitrogen freezing experiments under different conditions. The freezing pipe materials, the pipe arrangement, and the pipe connections were varied. The freezing pipe wall temperature is linearly distributed along the longitudinal direction with a traditional pipe structure. As a result there is a large temperature difference between the top and the bottom of the pipe. Opened holes on the liquid nitrogen supply tube reduced the temperature gradient along the freezing pipe. If the supply tube has small hole spacing and the tube is sealed at the bottom the temperature along the freezing pipe wall can be made essentially uniform. If two pipes are connected the pipe wall temperature of the liquid nitrogen inlet tube is lower than that of the air outlet pipe, at equivalent depths. The difference in temperature between the two pipes is almost identical. The principle factors affecting freezing pipe wall temperature are liquid nitrogen perfusion method, freezing pipe material, freezing pipe structure, and the method of connecting the pipes.

关 键 词：液氮冻结 温度场 冻结管 管壁温度 分布规律 冻结管结构 

分 类 号：TU443[建筑科学—岩土工程]