Numerical Simulation of Fouling Deposition in Narrow Rectangular Channel
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摘要: 为研究窄矩形通道内CaSO4溶液由于析晶沉积产生的污垢及对换热的影响，本研究基于合理的污垢沉积、污垢剥蚀与污垢热阻模型，利用FLUENT软件结合用户自定义函数（UDF）对一定热流密度、入口流速、入口温度和流体浓度的流体进行了析晶沉积模拟计算。研究结果表明了此工质的污垢产生情况和对换热的影响，同时得到热流密度、入口流速和流体浓度3种影响因素对污垢沉积的影响：污垢热阻随热流密度增大而增大，随入口流速增大而减小，随流体浓度增大而增大。本研究可用于模拟板状燃料元件窄矩形通道由于析晶导致的污垢沉积过程。Abstract: In order to study the fouling caused by the crystallization deposition of CaSO4 solution in the narrow rectangular channel and its effect on heat transfer, based on the reasonable fouling deposition, fouling erosion and fouling thermal resistance models, the crystallization deposition simulation calculation of fluids with certain heat flux, inlet velocity , inlet temperature and fluid concentration is carried out by using FLUENT software and user-defined function (UDF).The research results show the fouling generation of this working medium and its influence on heat transfer, and the influence of three factors, namely heat flux, inlet velocity and fluid concentration, on fouling deposition is obtained: the fouling resistance increases with the increase of heat flux, decreases with the increase of inlet velocity, and increases with the increase of fluid concentration. This study can be used to simulate the fouling deposition process in the narrow rectangular channel of plate-shaped fuel elements due to crystallization.
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图 1 3种不同热流密度下的污垢热阻
Figure 1. Fouling Thermal Resistance under Three Different Heat Fluxes
图 4 3种不同入口流速下的污垢热阻
Figure 4. Fouling Thermal Resistance at Three Different Inlet Velocities
图 5 3种不同入口流速下的污垢沉积率计算结果
Figure 5. Calculation Results of Fouling Deposition Rate at Three Different Inlet Velocities
图 6 3种不同入口流速下的污垢剥蚀率计算结果
Figure 6. Calculation Results of Fouling Erosion Rate at Three Different Inlet Velocities
图 7 3种不同入口流速下的污垢厚度计算结果
Figure 7. Calculation Results of Fouling Thickness at Three Different Inlet Velocities
图 8 3种不同流体浓度下的污垢热阻计算结果
Figure 8. Calculation Results of Fouling Thermal Resistance at Three Different Fluid Concentrations
图 9 3种不同流体浓度下的污垢沉积率计算结果
Figure 9. Calculation Results of Fouling Deposition Rate at Three Different Fluid Concentrations
图 10 3种不同流体浓度下的污垢剥蚀率计算结果
Figure 10. Calculation Results of Fouling Erosion Rate at Three Different Fluid Concentrations
图 11 3种不同流体浓度下的垢层厚度计算结果
Figure 11. Calculation Results of Fouling Thickness at Three Different Fluid Concentrations
表 1 计算工况表
Table 1. Calculation Condition Table
工况编号 q/(kW·m−2) Tin/K win/(m·s−1) cin/(kg·m−3) 1 46 315 0.03 2.42 2 42 315 0.03 2.42 3 50 315 0.03 2.42 4 46 315 0.05 2.42 5 46 315 0.07 2.42 6 46 315 0.03 2.22 7 46 315 0.03 2.62 
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