摘要
作为一种优良的低温冷却剂,液氮在航天、电子工业、超导磁体和超导电缆冷却及低温生物医疗等领域应用广泛。在这些应用中,准确预测液氮的流动沸腾换热特性对于系统设计和安全运行十分重要。该文主要介绍了液氮流动沸腾换热的特点,对已有的实验和数值模拟结果进行了归纳;并比较了四个液氮流动沸腾换热计算关联式的预测情况,以及关联式中干度、质量流量、热流密度和压力对换热系数的影响;指出了有待进一步研究的课题。
As a kind of excellent cryogen, liquid nitrogen has been widely used in many fields, such as the aerospace, electronic engineering, cooling of superconducting magnet and superconducting power cable, cryo -medicine, etc. In these applications, it is very crucial to predict the flow boiling heat transfer coefficient of liquid nitrogen for the system design and safe operation. In this article, some characteristics of liquid nitrogen flow boiling different from those for the ordinary fluids are introduced, and the related experimental and numerical resalts are reviewed. Four heat transfer correlations for liquid nitrogen flow boiling are evaluated comparatively. The effects of quality, mass flux, heat flux and pressure on the flow boiling heat transfer coefficients are discussed. Some potential problems for further study are clarifled.
出处
《低温与超导》
CAS
CSCD
北大核心
2006年第6期417-423,共7页
Cryogenics and Superconductivity
基金
国家自然科学基金(50436030)
全国优秀博士论文作者专项基金(200236)
新世纪优秀人才支持计划资助项目
关键词
液氮
流动沸腾
传热
Liquid nitrogen, Flow boiling, Heat transfer
