Model for seawater fouling and effects of temperature, flow velocity and surface free energy on seawater fouling

doi:10.1016/j.cjche.2016.01.012

Chin.J.Chem.Eng. ›› 2016, Vol. 24 ›› Issue (5): 658-664.DOI: 10.1016/j.cjche.2016.01.012

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Model for seawater fouling and effects of temperature, flow velocity and surface free energy on seawater fouling

Dazhang Yang¹, Jianhua Liu^1,2, Xiaoxue E¹, Linlin Jiang¹

1 School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2 Shanghai Key Laboratory of Multi-phase Flow and Heat Transfer, Shanghai 200093, China

Received:2015-04-04 Revised:2015-07-21 Online:2016-06-14 Published:2016-05-28
Contact: Heng Liang
Supported by:
Supported by the Leading Academic Discipline Project of Shanghai Municipal Education Commission (J50502) and the Construction of Shanghai Science and Technology Commission (13DZ2260900).

Model for seawater fouling and effects of temperature, flow velocity and surface free energy on seawater fouling

Dazhang Yang¹, Jianhua Liu^1,2, Xiaoxue E¹, Linlin Jiang¹

1 School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2 Shanghai Key Laboratory of Multi-phase Flow and Heat Transfer, Shanghai 200093, China

通讯作者: Jianhua Liu
基金资助:
Supported by the Leading Academic Discipline Project of Shanghai Municipal Education Commission (J50502) and the Construction of Shanghai Science and Technology Commission (13DZ2260900).

Abstract

Abstract: A kinetic model was proposed to predict the seawater fouling process in the seawater heat exchangers. The new model adopted an expression combining depositional and removal behaviors for seawater fouling based on the Kern-Seaton model. The present model parameters include the integrated kinetic rate of deposition (k_d) and the integrated kinetic rate of removal (k_r),which have clear physical significance. A seawater-foulingmonitoring devicewas established to validate themodel. The experimental data werewell fitted to themodel, and the parameters were obtained in different conditions. SEM and EDX analyses were performed after the experiments, and the results show that the main components of seawater fouling are magnesium hydroxide and aluminum hydroxide. The effects of surface temperature, flow velocity and surface free energy were assessed by the model and the experimental data. The results indicate that the seawater fouling becomes aggravated as the surface temperature increased in a certain range, and the seawater fouling resistance reduced as the flowvelocity of seawater increased. Furthermore, the effect of the surface free energy ofmetals was analyzed, showing that the lower surface free energy mitigates the seawater fouling accumulation.

Key words: Fouling, Seawater, Model, Surface temperature, Flow velocity, Surface free energy

摘要： A kinetic model was proposed to predict the seawater fouling process in the seawater heat exchangers. The new model adopted an expression combining depositional and removal behaviors for seawater fouling based on the Kern-Seaton model. The present model parameters include the integrated kinetic rate of deposition (k_d) and the integrated kinetic rate of removal (k_r),which have clear physical significance. A seawater-foulingmonitoring devicewas established to validate themodel. The experimental data werewell fitted to themodel, and the parameters were obtained in different conditions. SEM and EDX analyses were performed after the experiments, and the results show that the main components of seawater fouling are magnesium hydroxide and aluminum hydroxide. The effects of surface temperature, flow velocity and surface free energy were assessed by the model and the experimental data. The results indicate that the seawater fouling becomes aggravated as the surface temperature increased in a certain range, and the seawater fouling resistance reduced as the flowvelocity of seawater increased. Furthermore, the effect of the surface free energy ofmetals was analyzed, showing that the lower surface free energy mitigates the seawater fouling accumulation.

关键词: Fouling, Seawater, Model, Surface temperature, Flow velocity, Surface free energy

Dazhang Yang, Jianhua Liu, Xiaoxue E, Linlin Jiang. Model for seawater fouling and effects of temperature, flow velocity and surface free energy on seawater fouling[J]. Chin.J.Chem.Eng., 2016, 24(5): 658-664.

Dazhang Yang, Jianhua Liu, Xiaoxue E, Linlin Jiang. Model for seawater fouling and effects of temperature, flow velocity and surface free energy on seawater fouling[J]. Chinese Journal of Chemical Engineering, 2016, 24(5): 658-664.

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Model for seawater fouling and effects of temperature, flow velocity and surface free energy on seawater fouling

Model for seawater fouling and effects of temperature, flow velocity and surface free energy on seawater fouling

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