Modeling liquid-side particulate fouling in internal helical-rib tubes
Modeling liquid-side particulate fouling in internal helical-rib tubes
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DOI：
10.1016/j.ces.2007.04.052
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发表时间：
2007-08
影响因子：
4.7
通讯作者：
Wei Li
中科院分区：
文献类型：
--
作者：
Wei Li
本文提供了五个15.54mm内径的加速颗粒污垢数据。铜，螺旋肋管采取在不同的浓度和速度。几何参数的范围为肋骨起始数（18-45）、螺旋角（25-45°）和高度（0.33-0.55mm）。使用平均粒径为3.0μm的氧化铝颗粒作为污垢剂。这些几何形状提供了一种新型的内部增强，这是目前用于水冷却器的商业增强管的典型特征。建立了半理论模型。该模型结合了螺旋肋管生产厂家的实验数据[（j/jp）/（f/fp），其中j= StPr ~（2/3），f为摩擦系数，下标p为光滑表面]，可以预测螺旋肋管的污垢行为。基于不同的参考管，污垢因子比值的关联式有两种：线性关联式和非线性关联式。增强管与普通管的污垢因子的比率随着效率指数的增加而非线性地增加，并且增强管与增强管4的污垢因子的比率随着效率指数的增加而线性地增加。具有肋起点数量（10）、螺旋角（45°）和高度（0.43 mm）的增强管4是当前运行的冷却器中最流行的螺旋肋管。将污垢因子比分为污垢过程指数和效率指数的半理论分析大大简化了污垢分析。
This paper provides accelerated particulate fouling data in five 15.54mm I.D. copper, helically ribbed tubes taken at different concentrations and velocities. The ranges of geometric parameters were number of rib starts (18–45), helix angle (25–45°), and height (0.33–0.55mm). Aluminum oxide particles with 3.0μm average particle diameters were used as foulant. These geometries provide a new class of internal enhancement that is typical of commercially enhanced tubes presently used in water chillers. A semi-theoretical model is developed. The model, with experimentally determined efficiency index [(j/jp)/(f/fp), where j=StPr2/3, the f is a friction factor, the subscript p refers to smooth surface] by the tube manufacturer, can predict the fouling behavior of helically ribbed tubes. There are two series of correlations of the ratio of fouling factor based on different reference tube: linear correlation and nonlinear correlation. The ratio of enhanced-to-plain tube fouling factor nonlinearly increases with increasing the efficiency index and the ratio of the enhanced-to-enhanced tube 4 fouling factor linearly increases with increasing the efficiency index. The enhanced tube 4 with number of rib starts (10), helix angle (45°), and height (0.43 mm) is the most popular helically ribbed tube in current operating chillers. The semi-theoretical analysis of dividing a fouling factor ratio into a fouling process index and an efficiency index significantly simplifies the fouling analysis.