Experimental Study of Fouling on Heat Transfer Surface During Forced Convective Heat Transfer

›› 2008, Vol. 16 ›› Issue (4): 535-540.

• TRANSPORT PHENOMENA & FLUID MECHANICS • Previous Articles Next Articles

Experimental Study of Fouling on Heat Transfer Surface During Forced Convective Heat Transfer

QUAN Zhenhua, CHEN Yongchang, MA Chongfang

The Education Ministry Key Laboratory of Enhanced Heat Transfer and Energy Conservation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

Received:2007-07-03 Revised:2008-03-05 Online:2008-08-28 Published:2008-08-28
Supported by:
the State Key Development Program for Basic Research of China(G2007CB206904);the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Ministry of Education of China(00084);the Doctoral Fund of Beijing University of Technology(X004016200801)

Experimental Study of Fouling on Heat Transfer Surface During Forced Convective Heat Transfer

全贞花, 陈永昌, 马重芳

The Education Ministry Key Laboratory of Enhanced Heat Transfer and Energy Conservation, College of Environmental and Energy Engineering, Beijing University of Technology, Beijing 100124, China

通讯作者: QUAN Zhenhua, E-mail: quanzh@bjut.edu.cn
基金资助:
the State Key Development Program for Basic Research of China(G2007CB206904);the Scientific Research Foundation for the Returned Overseas Chinese Scholars,Ministry of Education of China(00084);the Doctoral Fund of Beijing University of Technology(X004016200801)

Abstract

Abstract: An experimental study was conducted to investigate the fouling process of calcium carbonate on the heat transfer surface, during forced convective heat transfer. The dynamic monitoring apparatus of fouling resistance was set up for the present experiments. The fouling behaviors were examined under different factors including fluid velocity, hardness, alkalinity, solution temperature, and wall temperature. Asymptotic fouling curves varying with time were obtained. The fouling rate and asymptotic fouling resistance increased and the induction periods were shortened with the fluid velocity decreasing, hardness and alkalinity increasing, and solution temperature and heat transfer surface temperature increasing. The components of fouling that formed on the heat transfer surface included crystallization fouling and particulate fouling. The thermal performance parameter of fouling, ρ_fλ_f, varied from 380 to 2600 kg·W·(m⁴·K)^-1, increasing with growing velocity and decreasing solution temperature, hardness or alkalinity. Furthermore, the thermal conductivity of fouling, λ_f, varied from 1.7 to 2.2 W·(m·K)^-1.

Key words: fouling, thermal resistance, heat transfer, calcium carbonate

摘要： An experimental study was conducted to investigate the fouling process of calcium carbonate on the heat transfer surface, during forced convective heat transfer. The dynamic monitoring apparatus of fouling resistance was set up for the present experiments. The fouling behaviors were examined under different factors including fluid velocity, hardness, alkalinity, solution temperature, and wall temperature. Asymptotic fouling curves varying with time were obtained. The fouling rate and asymptotic fouling resistance increased and the induction periods were shortened with the fluid velocity decreasing, hardness and alkalinity increasing, and solution temperature and heat transfer surface temperature increasing. The components of fouling that formed on the heat transfer surface included crystallization fouling and particulate fouling. The thermal performance parameter of fouling, ρ_fλ_f, varied from 380 to 2600 kg·W·(m⁴·K)^-1, increasing with growing velocity and decreasing solution temperature, hardness or alkalinity. Furthermore, the thermal conductivity of fouling, λ_f, varied from 1.7 to 2.2 W·(m·K)^-1.

关键词: fouling, thermal resistance, heat transfer, calcium carbonate

QUAN Zhenhua, CHEN Yongchang, MA Chongfang. Experimental Study of Fouling on Heat Transfer Surface During Forced Convective Heat Transfer[J]. , 2008, 16(4): 535-540.

全贞花, 陈永昌, 马重芳. Experimental Study of Fouling on Heat Transfer Surface During Forced Convective Heat Transfer[J]. , 2008, 16(4): 535-540.

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Experimental Study of Fouling on Heat Transfer Surface During Forced Convective Heat Transfer

Experimental Study of Fouling on Heat Transfer Surface During Forced Convective Heat Transfer

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