Experiments investigation of the effects of surface roughness on laminar flow in macro tubes
Experiments investigation of the effects of surface roughness on laminar flow in macro tubes
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表面粗糙度对大管内层流影响的实验研究
DOI：
10.1016/j.expthermflusci.2012.10.022
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发表时间：
2013-02
影响因子：
3.2
通讯作者：
万军伟
中科院分区：
文献类型：
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作者：
万军伟
实验研究了宏观管（d=19mm）中表面粗糙度对层流流动的影响。头部下降实验在6个相对粗糙度（Δ/d）为1/118.75 ~ 1/6.66的有机玻璃管中进行。水头下降数据用于表征雷诺数范围为300至25000的摩擦系数。相对粗糙度（Δ/d<5%）管的实验结果与Nikuradse的研究结果吻合较好。用理论相关系数fRe可以很好地预测层流中的摩擦系数。对于相对粗糙度较大的管（Δ/d>5%），摩擦系数与经典理论有明显偏差。fRe的积大于64，且随相对粗糙度的增加而增加。较早的层流向湍流的转变也得到了证实。临界雷诺数随相对粗糙度的增大而线性减小。
This paper experimentally investigated the effects of surface roughness on laminar flow in macro tubes (d=19mm). Head drop experiments were conducted in six organic glass tubes with relative roughness (Δ/d) ranging from 1/118.75 to 1/6.66. Water head drop data were used to characterize the friction factor over a Reynolds number ranging from 300 to 25000. The experimental results for tubes with relative roughness (Δ/d<5%) were in good agreement with Nikuradse’ study. The friction factor could be well predicted by theoretical correlation fRe in laminar flow. Obvious deviation of the friction factor from the classical theory was observed for tubes with large relative roughness (Δ/d>5%). The product of fRe was larger than 64 and increased with an increase in relative roughness. Earlier transition from laminar to turbulent flow was also confirmed. The critical Reynolds number linearly deceased as the relative roughness increased.
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DOI：
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发表时间：
--
期刊：
--
影响因子：
--
作者：
Henry Darcy
通讯作者：
Henry Darcy
影响因子：
1.2
作者：
S. Kandlikar
通讯作者：
S. Kandlikar
DOI：
10.1115/icnmm2006-96062
发表时间：
2006
期刊：
--
影响因子：
--
作者：
Timothy P. Brackbill;S. Kandlikar
通讯作者：
Timothy P. Brackbill;S. Kandlikar
影响因子：
2.1
作者：
Wu Peiyi;W. Little
通讯作者：
Wu Peiyi;W. Little
影响因子：
4.6
作者：
Kandlikar, SG;Schmitt, D;Taylor, JB
通讯作者：
Taylor, JB