A semi-empirical correlation for crystallization fouling on heat exchange surfaces
A semi-empirical correlation for crystallization fouling on heat exchange surfaces
复制标题
DOI：
10.1016/j.applthermaleng.2005.05.021
复制
发表时间：
2006-03
影响因子：
6.4
通讯作者：
M. G. Mwaba;M. Golriz;J. Gu
中科院分区：
文献类型：
--
作者：
M. G. Mwaba;M. Golriz;J. Gu
本文报道了结晶结垢实验。总的来说，结果显示出四个不同的时间段：污垢热阻为零的区域，污垢热阻为负的区域，污垢热阻稳定增加的区域和污垢热阻保持恒定的区域。这些区域中的每一个都可以与结晶结垢过程中的不同发展阶段相匹配：成核阶段（区域1和2），生长阶段和渐近阶段。总体而言，污染曲线呈s型曲线，具有logistic曲线的特征。在logistic方程解的基础上，提出了一种新的相关性。对相关参数进行了评价，并与结晶参数进行了关联。本文的研究结果可用于预测运行中的换热器结垢层的演变。这些预测可以帮助热交换器操作员计划清洁时间表。
Crystallization fouling experiments are reported in this paper. In general the results show four distinct time regions: a region where the fouling thermal resistance is zero, a region where the fouling thermal resistance is negative, a region where the fouling resistance increases steadily and a region where the fouling thermal resistance remains constant. Each of these regions can be matched with different development phases in the crystallization fouling process: nucleation phase (regions 1 and 2), growth phase and asymptotic phase. Overall the fouling curves exhibit an S-curve, characteristic of the logistic curve. A new correlation based on the solution of the logistic equation is formulated. The correlation parameters are evaluated and related to the crystallization parameters. The results of this work can find application in predicting the evolution of the fouling scale layer in heat exchangers that are in operation. The predictions can assist heat exchanger operators to plan cleaning schedules.