Numerical simulation and experimental study of the growth characteristics of particulate fouling on pipe heat transfer surface

Zhang, Ning; Wei, Xin; Yang, Qirong; Li, Nan; Yao, Erren

doi:10.1007/s00231-018-2451-y

Cited by 21 publications

(6 citation statements)

References 14 publications

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“…The particle fouling mathematical model was confirmed by using the data of R f in a plain tube at various input velocities in Zhang. 46 As can be observed from Figure 6, the fluctuation trend of the calculated results is in line with the experimental data reported in the literature. The R f increases first and then approaches an asymptotic value, and the asymptotic values of R f gradually decrease with an increase in flow velocity.…”

Section: Industrial and Engineeringsupporting

confidence: 89%

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Particulate Fouling Analysis and Optimization of Heat Transfer Tubes Inserted with a Self-Rotating Rotor Coupled with RSM and MOGA

Xie,

Wu,

Wang

et al. 2024

Ind. Eng. Chem. Res.

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Particulate fouling, a typical scaling formation in heat transfer tubes, is a crucial cause of pipe clogging and thermal efficiency reduction. We innovatively proposed a new type of self-rotating rotor inserted into tubes to improve the antifouling performance and employed the Eulerian−Eulerian model incorporating an empirical fouling model that accounted for both particle deposition and removal mechanisms. Additionally, we utilized the multiple reference frame (MRF) model to simulate the rotation of the self-rotating rotor at various flow rates. To investigate the influence of the configuration parameters and optimize the thermal and antifouling performance of the self-rotating rotor, we combined the response surface method (RSM) with a multiobjective genetic algorithm (MOGA). First, we observed that the temperature increment initially increased and then decreased with increasing in velocity. Moreover, the temperature increment initially decreases and then increases with an increase in the width of the rotor, and it decreases as the pitch of the rotor increases. The fouling resistance decreases with increasing velocity, while the relationship between fouling resistance and width/pitch varies with velocity. To determine the sensitivity of the temperature increment and fouling resistance to the configuration parameters, we conducted local sensitivity analyses, demonstrating that pitch had the most significant effect on the temperature increment, followed by velocity, while width exhibited the least influence. Furthermore, the fouling resistance was found to be highly sensitive to changes in velocity with a sensitivity value of −96.01%. Based on Pareto set analysis, we identified an optimal configuration that resulted in a 9.4% enhancement in the temperature increment and a 59.3% reduction in fouling resistance. These findings can serve as valuable references for the selection and design of self-rotating rotors.

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Section: Industrial and Engineeringsupporting

confidence: 89%

“…The particle fouling mathematical model was confirmed by using the data of R f in a plain tube at various input velocities in Zhang . As can be observed from Figure , the fluctuation trend of the calculated results is in line with the experimental data reported in the literature.…”

Section: Grid Independence Verification and Model Verificationsupporting

confidence: 80%

Particulate Fouling Analysis and Optimization of Heat Transfer Tubes Inserted with a Self-Rotating Rotor Coupled with RSM and MOGA

Xie,

Wu,

Wang

et al. 2024

Ind. Eng. Chem. Res.

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“…It is used to measure the turbulence characteristics and turbulence intensity in the boundary layer near the wall of the heat exchange tube. Its calculation process is as follows [23] :…”

Section: Mathematical Model Of Net Deposition Of Microorganisms and P...mentioning

confidence: 99%

Numerical simulation of deposition characteristics of microorganisms and particles mixed fouling in sewage heat exchange tube

Zhuang,

Zhao,

Zhang

et al. 2024

Preprint

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Sewage source heat pump technology is an innovative way of energy recovery. It can use the heat in all kinds of sewage to heat and cool buildings. This technology not only saves energy, but also has good economic benefits. At present, the main problem of this technology is the fouling problem. Microbial fouling and particle fouling are the main components of fouling in sewage heat exchangers. In this paper, the mixed dirt composed of microbial dirt and particulate dirt is taken as the research object. The deposition characteristics of mixed fouling in sewage were studied by numerical simulation. The mathematical model of mixed fouling deposition was established. The effects of various factors on mixed fouling deposition were simulated and analyzed by using the model. The results show that when the flow rate increases from u = 0.5m/s to u = 1.5m/s, the thermal resistance value of mixed dirt equilibrium in winter condition decreases from 27.97×10− 4 m2·K·W− 1 to 9.82×10− 4 m2·K·W− 1, a decrease of 64.9%. At this time, the thermal resistance in summer condition is reduced from 36.41×10− 4 m2·K·W− 1 to 11.15×10− 4 m2·K·W− 1, a decrease of 69.4%. The higher the inlet temperature, the higher the deposition rate of mixed dirt, and the shorter the time required for thermal resistance to reach equilibrium. However, the inlet temperature has little influence on the thermal resistance of mixed dirt. When the particle size of microbial particles increases from 0.1mm to 0.5mm, the thermal resistance value of mixed dirt when it reaches equilibrium in winter condition increases from 17.34×10− 4 m2·K·W− 1 to 21.55×10− 4 m2·K·W− 1, increasing by 24.3%. At this time, the thermal resistance in summer condition increased from 18.94×10− 4 m2·K·W− 1 to 23.49×10− 4 m2·K·W− 1, an increase of 24.0%. When the size of hard particles increases from 1µm to 40µm, the thermal resistance in winter conditions increases from 14.52×10− 4 m2·K·W− 1 to 19.56×10− 4 m2·K·W− 1, an increase of 34.6%. At this time, the thermal resistance in summer condition increased from 16.68×10− 4 m2·K·W− 1 to 20.91×10− 4 m2·K·W− 1, an increase of 25.4%. The thermal resistance of mixed dirt increased by 0.97×10− 4 m2·K·W− 1 in winter condition and 1.06×10− 4 m2·K·W− 1 in summer condition with an increase of 200 mg/L microbial particle concentration. The thermal resistance increases by 7.3×10− 4 m2·K·W− 1 in winter and 8.1×10− 4 m2·K·W− 1 in summer for every 200 mg/L increase in hard particle concentration. The research results of this paper can provide scientific basis for the design of sewage heat transfer system and have important engineering application value.

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“…Conversely, particle density increases as the net deposition rate increases. The synergistic effect of particles with different characteristics affects the degree of fouling [45].…”

Section: Wosmentioning

confidence: 99%

Research on Scaling of Wastewater Transportation Pipes: A Review

Zhang¹,

Yang²,

Wang³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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The pipes are prone to scaling and fouling during collection and transportation, mainly due to the complex and variable composition of industrial wastewater. It causes failure of the transmission system, shortens the life of the pipe, increases the operation cost, and poses potential risks to the ecological environment as well as human health. Therefore, the purpose of this paper is to sort out the research progress on the factors influencing the scaling of wastewater transport pipes and the mechanism of action. To suggest scientific scale inhibition for wastewater transport pipes. The purpose of this paper is to ensure the safety stability along with the effectiveness of the transport pipeline and treatment structures. In addition to provide a reference for future research directions.

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Numerical simulation and experimental study of the growth characteristics of particulate fouling on pipe heat transfer surface

Cited by 21 publications

References 14 publications

Particulate Fouling Analysis and Optimization of Heat Transfer Tubes Inserted with a Self-Rotating Rotor Coupled with RSM and MOGA

Particulate Fouling Analysis and Optimization of Heat Transfer Tubes Inserted with a Self-Rotating Rotor Coupled with RSM and MOGA

Numerical simulation of deposition characteristics of microorganisms and particles mixed fouling in sewage heat exchange tube

Research on Scaling of Wastewater Transportation Pipes: A Review

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