Experimental research of the anti-fouling effect of the perforated vortex generator in the pulsating channel

doi:10.11949/0438-1157.20250432

Abstract

Abstract:

In order to solve the problem of particulate fouling in the heat exchanger channel, the anti-fouling effect characteristics of the perforated vortex generator in the pulsating channel were studied by the experimental bench built. First, the particulate fouling characteristics of four different types of channels were compared, and the particulate deposition characteristics of different perforated rectangular wing vortex generator in the pulsating channel were studied in depth, and the influence of the frontal angle of the perforated rectangular wing vortex generator on the particulate fouling was analyzed in detail. The results show that compared with the smooth channel, the anti-fouling effect rate of the pulsating channel is 15.7%, the anti-fouling effect rate of the pulsating + rectangular wing is 41.2%, and the anti-fouling effect rate of the pulsating + perforated rectangular wing channel is the best, and the anti-fouling effect rate is 47.5%. In the scope of this study, three different airfoil types (delta wing, trapezoidal wing, rectangular wing) with open holes are compared, and it is found that the vortex generator with open holes and rectangular wings has the best anti-fouling effect. In addition, when the angle is less than 90°, the fouling resistance gradually decreases with the increase of the angle of the perforated rectangular wing vortex generator, and when the angle is 90°, the fouling resistance is minimized.

Key words: pulsating flow, fouling, particle, two-phase flow, perforated vortex generator, fouling resistance

摘要：

为解决换热器通道内的颗粒污垢问题，通过搭建实验台研究了脉动通道内开孔涡流发生器的抑垢特性。对比了四种不同类型通道的颗粒污垢特性；研究了脉动通道内不同翼型开孔涡流发生器的颗粒沉积特性；分析了开孔矩形翼涡流发生器迎流角度对颗粒污垢的影响规律。结果表明，相较于光滑通道，脉动通道的抑垢率为15.7%，脉动＋矩形翼通道的抑垢率为41.2%，脉动＋开孔矩形翼通道的抑垢效果最佳，其抑垢率为47.5%。对比三种不同翼型（三角翼、梯形翼、矩形翼）开孔涡流发生器，发现开孔矩形翼涡流发生器的抑垢效果最好。当迎流角度小于90°时，污垢热阻随着开孔矩形翼涡发生器迎流角度的增大逐渐减小，当迎流角度为90°时污垢热阻达到最小。

关键词: 脉动流, 结垢, 粒子, 两相流, 开孔涡流发生器, 污垢热阻

CLC Number:

TK 124

Zhimin HAN, Wei LIU, Jiang LI, Taozhi WANG, Zhiming XU. Experimental research of the anti-fouling effect of the perforated vortex generator in the pulsating channel[J]. CIESC Journal, 2025, 76(10): 5047-5056.

韩志敏, 刘威, 李江, 王韬智, 徐志明. 脉动通道内开孔涡流发生器的抑垢特性实验研究[J]. 化工学报, 2025, 76(10): 5047-5056.

Figures/Tables 9

Fig.1 Diagram of the experimental system

Fig.2 Schematic diagram of the arrangement of perforated vortex generator

Table 1 Physical parameters of SiO2

粒径/μm	孔隙率/%	密度/(kg/m³)	热导率/(W/(m·K))
10	25	1900	1.62

Table 2 Measurement errors

物理量	测量误差/%
温度	0.203
压差	0.109
流量	0.504
污垢热阻	4.8
传热系数	4.1

Fig.3 Comparison of fouling resistance in different channels

Fig.4 Fouling of the heating surface in different channels

Fig.5 Comparison of fouling resistance of different perforated wing vortex generators

Fig.6 Fouling of different perforated wing vortex generators

Fig.7 Comparison of fouling resistance at different angles

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