摘要
本文报导了利用双像效应测相干光线分离距离的一种实验方法,使得在缺少有关光学参数情况下,仍可进行差分干涉图的定量计算。采用激光差分干涉仪对敷设在封闭槽盒中电缆群的自然对流换热进行了实验研究,得到了沿电缆表面局部 Nu 数的分布,与无限空间相同条件和相同工况时电缆表面的平均 Nu 数相比,约降低15%。
Based on double image effect,an experimental method for measurement of seperation distance of interference rays is reportedin this paper.By this means quantitative estimation of the temperaturedistribution from a differential interferogram without data on re-fractive index n_o and n_e can be carried out.Natural convection in enclo-sure with power cables is investigated by differential interferometry,in this case the local Nusselt Numbers around the surface of the ca-bles are obtained.The average Nusselt Number decrease in about 15%in comparison with that for cable surrounded by air in the same Gr.
关键词
电缆
散热
差分干涉
封闭槽盒
测量
double image
differential interferometry
natural convection
nusselt number
