中南大学学报（自然科学版）2012，Vol.43Issue(10)：4093-4099,7.
基于冯·卡门类比的强化管污垢模型及抗垢机理
Fouling model of enhanced tubes based on von Karman analogy and anti-fouling mechanism
摘要
Abstract
The comparative experiments on the CaCO3 fouling characteristics of four enhanced tubes (including the corrugated tube, convergent-divergent tube I , convergent-divergent tube II and arc-line tube) and a plain tube under the same operating conditions, such as the inlet temperature, flow velocity and hardness of artificial hard water and bath temperature of tubes, were carried out. Based on the von Karman analogy, ψ and ψ were regarded as their performance evaluation factors of heat transfer, ηψ and ηψ were used as their comprehensive performance evaluation indexes, and then a fouling model of enhanced tubes was established through the analysis of experimental data, such as their fouling resistance Rf and geometric parameters. The anti-fouling mechanisms of each enhanced tube were analyzed. The results show that it is the secondary turbulence and periodic pulse along the axis of flow velocity direction in the corrugated tube scouring near-wall flow that enhances the removal mass rate of fouling dramatically so that it is difficult for the tube to cause fouling and even realize automatic cleaning. The arc-line tube has the anti-fouling performance in which the periodic disturbance of flow in it weakens fouling deposition and the sharp increasing laryngeal wall shear stress boosting fouling removes greatly. The convergent-divergent tube can resist fouling because the fouling removal mass rate is enhanced doubly by fluid's intensive periodic disturbance caused by the alternate switch of axis pressure gradient and the swing eddy current at the laryngeal.关键词
强化管/冯·卡门类比/污垢模型/抗垢机理Key words
enhanced tubes/von Karman analogy/fouling model/anti-fouling mechanism分类
能源科技引用本文复制引用
张仲彬,李煜,徐志明..基于冯·卡门类比的强化管污垢模型及抗垢机理[J].中南大学学报（自然科学版）,2012,43(10):4093-4099,7.基金项目
国家自然科学基金资助项目(51076025) （51076025）
