Heat transfer and pressure drop in ice-water slurries
Heat transfer and pressure drop in ice-water slurries
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DOI：
10.1016/s1359-4311(99)00046-0
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发表时间：
2000-05
影响因子：
6.4
通讯作者：
B. D. Knodel;U. Choi;M. W. Wambsganss
中科院分区：
文献类型：
--
作者：
B. D. Knodel;U. Choi;M. W. Wambsganss
本文对冰水混合物在内径24.0mm、长4.596m的不锈钢水平管内的传热和阻力特性进行了实验研究。实验的浆料速度从2.8到5.0 m/s变化，其涵盖了基于冰水浆料的区域冷却系统的适用范围。在目前的实验中观察到以前报道的流动再层化现象在冰水浆料。随着冰分数的增加，与流动再层化相关的摩擦压降减少。冰分数为4%，标志着一个部门的减少率，和压降相关方程的冰分数高于4%。在实验的速度范围内确定传热系数。与流动再层化相一致，传热系数随着冰分数的增加而减小。还开发了一个相关方程的传热系数在冰分数高于4%。
Heat transfer and pressure drop were experimentally investigated for ice-water slurries flowing turbulently in a 24.0 mm internal diameter, 4.596 m long, horizontal, stainless steel tube. The slurry velocity of the experiments was varied from 2.8 to 5.0 m/s which encompassed the range of applicability to ice-water slurry-based district cooling systems. The previously reported phenomenon of flow relaminarization in ice-water slurries was observed in the current experiments. A reduction in frictional pressure drop associated with the flow relaminarization was measured as the ice fraction increased. An ice fraction of 4% marked a division in the rate of reduction, and a pressure-drop correlation equation was developed for ice fractions above 4%. Heat transfer coefficients were determined over the velocity range of the experiments. Consistent with the flow relaminarization, the heat transfer coefficient decreased with increasing ice fraction. A correlation equation was also developed for heat transfer coefficients at ice fractions above 4%.