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《Chemical Engineering(China)》 2008-07
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Experimental investigation on running characteristics of twisted tube in evaporator

QING De-fan,DUAN Xiao-lin,LIU Yin-hong(Institute of Mechanical Engineering,Nanhua University,Hengyang 421001,Hunan Province,China)  
The comparable experimental investigation on the heat-exchange,resistance and fouling characteristics of normal straight tubes and twisted tubes in evaporator was carried out.The normal tube size is 45 mm×3 mm,the twisted tubes were consisted of the normal tubes,and the screw pitch St was 450,550 and 650 mm.The effect of Re and St on characteristics was studied in the experiment.The results show that the fouling resistance is asymptotic within the experimental region;compared with the normal tubes,the fouling resistance of the twisted tubes is about 0.15-0.29 times and the flow resistance coefficient is about 1.48-1.63 times;the effect of enhanced heat exchange increases with the decrease of the screw pitch St,the heat transfer coefficient of the twisted tube is 1.29-1.51 times that of the normal tubes when tube is clean,and tends to 1.96-2.79 times as it runs 8 h because of the effect of anti-fouling of twisted tube.
【Fund】: 湖南省教育厅基金资助项目(03C422)
【CateGory Index】: TQ051.8
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