Particulate fouling of water in tubes having a two-dimensional roughness geometry
Particulate fouling of water in tubes having a two-dimensional roughness geometry
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DOI：
10.1016/0017-9310(91)90231-3
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发表时间：
1991-11
影响因子：
5.2
通讯作者：
Kim Nae-Hyun;R. Webb
中科院分区：
文献类型：
--
作者：
Kim Nae-Hyun;R. Webb
在这项研究中，一个合理的污垢模型。该模型结合实验确定的粘附概率和存款粘结强度因子，可以预测重复肋管的污垢行为。传质速率被假定为控制颗粒的传输过程，壁面切应力被假定为控制去除过程。由相应的传热关联式得到了重复肋管的传质速率。壁面切应力是根据肋间的流动结构来模拟的。在水中进行颗粒结垢测试。本研究中研究的变量范围为粗糙度变量（0.015 <-e/D<-0.030和10 <p/e< 20）。雷诺数（14000≤ Re≤ > 26000）和污垢物质（氧化铁和氧化铝）。管材为铜，肋截面为弧形。经验相关性定义了几何和流动参数对粘附概率和粘结强度因子的影响。进行分析，解释作用在壁处的颗粒上的力。分析表明，水动力是目前的测试占主导地位。该分析定性地支持了经验获得的粘附概率的几何和雷诺数依赖性。
In this study, a rationally based fouling model is developed. The model, with experimentally determined sticking probability and deposit bond strength factor, can predict the fouling behavior of repeated rib tubes. The mass transfer rate is assumed to control the particle transport process, and the wall shear stress is assumed to control the removal process. The mass transfer rate for repeated rib tubes is obtained from the corresponding heat transfer correlations. The wall shear stress is modeled based on the flow structure between the ribs. Particulate fouling tests are conducted in water. The range of variables investigated in this study are the roughness variables (0.015 <-e/D<- 0.030 and 10 <p/e< 20). Reynolds number (14000≤ Re≤ > 26000) and the foulant material (ferric oxide and aluminum oxide). The tube material is copper, and the rib cross-section is arc-shaped. Empirical correlations define the effect of the geometric and flow parameters on the sticking probability and bond strength factor. An analysis is performed that accounts for the forces acting on the particles at the wall. The analysis suggests that the hydrodynamic force is dominant for the present tests. This analysis qualitatively supports the empirically obtained geometric and Reynolds number dependencies of the sticking probability.