摘要
搭建了微槽道的单相实验台,分析了氮气在不同深/宽比、长径比及水力直径的微槽道中流动特性。层流区的摩擦常数与理论预测值吻合较好(除L=20mm工况),层流到湍流的转捩均有不同程度的提前(转捩Re数在1000左右);在湍流区,槽道的长径比变小、相对粗糙度的增大(或水力直径的减小)及长度的减小可使流动阻力增大;拟合出了湍流区微槽道的几何参数与摩擦常数的关联式。
The related experimental system is established. Flow characteristics with different depth width ratio, length diameter ratio and diameters are studied in details. It is validated that friction constant fits well with conventional theory predicted. It is found that the friction constant for turbulent flow is obviously larger with length diameter ratio decreases, roughness increases（or diameter decrease）, and length decreases. The correlation between friction constant and geometry parameters in turbulent flow region is given.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2011年第9期1535-1537,共3页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助(No.50776006
No.50876006)
关键词
长径比
深/宽比
相对粗糙度
摩擦常数
length diameter ratio
depth width ratio
roughness
friction constant
