Nu-number

The experimental Nusselt number is compared with that of the classical correlations.

采用焦耳加热法对不同尺寸的水平微细铜丝在水中加热,并将实验得到的努谢尔特数Nu与常规尺寸下经典准则关系式的计算值比较。

As the Reynolds number varied in the range from 100 up to 7 000 in the experiments and the friction factor and the Nusselt number were obtained correspondingly.

[关键词]微管,摩擦系数,努谢尔特

As the Reynolds number varied in the range from 100 up to 6000 and the Nusselt numbers were measured,cor.

实验得到了雷诺数Re在100~6 000变化时的努谢尔特数Nu,并与经典的层流、过渡流及紊流换热准则方程式进行了对比。

The characteristics of temperature distribution,mean Nuselt number and local Nuselt number are obtained.

利用红外热象仪对一叉流板翅式换热器内气流的温度分布进行了测试，获得了换热器模型内温度分布的特征，以及平均努谢尔特数和局部努谢尔特数变化规律的结果，并对换热器内的传热过程进行了分析。