Thermal performance assessment of self-rotating twisted tapes and Al_(2)O_(3) nanoparticle in a circular pipe  

作　　者：Chuanshuai Dong Lin Lu Tao Wen Shaojie Zhang 

机构地区：[1]Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Education Ministry,School of Chemistry and Chemical Engineering,South China University of Technology,Guangzhou 510000,China [2]Department of Building Services Engineering,The Hong Kong Polytechnic University,11 Yuk Choi Road,Hung Hom,Kowloon,Hong Kong,China [3]Department of Chemical Engineering,Imperial College London,London,United Kingdom

出　　处：《Chinese Journal of Chemical Engineering》2021年第4期77-86,共10页中国化学工程学报（英文版）

摘　　要：In view of the practical importance of the heat transfer devices in various thermal engineering fields including chemical and nuclear engineering,this study aims at developing an effective method of heat transfer enhancement by using selfrotating twisted tapes(SRTTs)and Al_(2)O_(3) nanoparticles.The effect of the selfrotating twisted tapes and Al2O3 nanoparticles on the thermal performance was comprehensively investigated in a circular pipe.The experimental results indicated the heat transfer rate was effectively improved by SRTTs in comparison of plain tube.In addition,the heat transfer multiplier with SRTTs decreased from 1.38 to 1.08 with the Reynolds number increasing from 19,322 to 64,407,while the friction factor multiplier decreased from 1.61 to 1.32.Besides,the results indicated that the employment of Al_(2)O_(3) nanoparticles and SRTTs demonstrated superior thermal performance to the single SRTTs.As Reynolds number increases from 19,322 to 64,407,the heat transfer multiplier decreased from 2.08 to 1.18 in the mass concentration of 3.0%and from 1.38 to 1.08 in mass concentration of 0.0%.Finally,the new heat transfer and friction factor correlations considering the combined effect of Al2O3 nanoparticle and SRTTs were developed within 10%deviation of experimental values.

关 键 词：Heat transfer enhancement Nanoparticles Friction factor Self-rotating twist tapes Thermal performance factor 

分 类 号：TQ021.3[化学工程]