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《Guangdong Electric Power》 2004-05
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Experimental investigation on convective heat transfer and flowing friction in RISG tubes

LONG Xin-fengion,Ministry of Education,School of Chemical Engineering and Energy,South China Univ. of Technology,Guangzhou 510640,China)  
Aiming at the need of non-copper in boiler feedwater system in power plants, a new type of steel two-side heat transfer enhancement tube, namely ratchet tube with internal spiral grooves (RISG tube), was designed and manufactured. By use of a general steam condensation testing equipment only for horizontal single tube, a set of experimental tests are conducted on 5 RISG tubes with different structural parameters to investigate the characteristics of heat transfer and flowing friction. Based on a lot of experimental data, the correlations of internal heat transfer coefficient and friction factor are obtained in the range of experimental Reynolds number. Furthermore, performance evaluation criteria are used to obtain quantitative estimates of the benefits offered by RISG tubes with water flowing in them. As the experimental results indicated, compared with smooth tubes, the internal heat transfer coefficient of all RISG tubes is improved by 42% to 152%, and the flow resistance coefficient increased by 48% to 350%. The integrate capability of RISG tubes in heat transfer and flowing friction is better than that of smooth tubes under any condition. As a result, RISG tubes can be used in heat exchanging equipments of power plants to considerably enhance the utilization of thermal energy.
【Fund】: 广东省科技计划资助项目(2KM00905G)
【CateGory Index】: TK124
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