Chinese Journal of Chemical Engineering ›› 2021, Vol. 32 ›› Issue (4): 77-86.doi: 10.1016/j.cjche.2020.10.045

• Fluid Dynamics and Transport Phenomena • Previous Articles     Next Articles

Thermal performance assessment of self-rotating twisted tapes and Al2O3 nanoparticle in a circular pipe

Chuanshuai Dong1, Lin Lu2, Tao Wen3, Shaojie Zhang2   

  1. 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
  • Received:2020-04-08 Revised:2020-08-31 Online:2021-04-28 Published:2021-06-19
  • Contact: Shaojie Zhang
  • Supported by:
    This project is supported by the National Natural Science Foundation of China (51906071), Science and Technology Planning Project of Guangdong Province (2018A050501005), the Postdoctoral Science Foundation of China (2019M652889), the National Natural Science Foundation of Guangdong (No. 2019A1515011536), the Fundamental Research Funds for the Central Universities (D2191890) and Key Laboratory of Advanced Reactor Engineering and Safety, Ministry of Education (ares-2019-09).

Abstract: 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 self-rotating twisted tapes (SRTTs) and Al2O3 nanoparticles. The effect of the self-rotating 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 Al2O3 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.

Key words: Heat transfer enhancement, Nanoparticles, Friction factor, Self-rotating twist tapes, Thermal performance factor