CIESC Journal ›› 2021, Vol. 72 ›› Issue (4): 2006-2017.DOI: 10.11949/0438-1157.20200916

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Influence of micro-rib structures on thermal performance of nanofluids flowing around circular cylinders

QI Cong(),LI Ke'ao,LI Chunyang   

  1. School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu, China
  • Received:2020-07-07 Revised:2020-12-11 Online:2021-04-05 Published:2021-04-05
  • Contact: QI Cong

微肋结构对纳米流体绕流圆柱热性能的影响

齐聪(),李可傲,李春阳   

  1. 中国矿业大学电气与动力工程学院,江苏 徐州 221116
  • 通讯作者: 齐聪
  • 作者简介:齐聪(1983—),男,博士,副教授,qicong@cumt.edu.cn
  • 基金资助:
    江苏省自然科学基金面上项目(BK20181359)

Abstract:

To improve the heat transfer efficiency of traditional heat exchanger and heat transfer medium, TiO2-water nanofluids with different mass fractions (ω=0.1%, 0.2%, 0.3%, 0.4%, 0.5%) were prepared by a two-step method, and the circular cylinders heat transfer systems with different micro-rib structures (vertical and annular fins) were developed, and the effects of the micro-rib structure types (vertical and circular ribs) and numbers (N1(2)=4, 6, 8) on cylindrical surfaces, the mass fraction of nanoparticles (ω=0, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%), and Reynolds number (Re=514—1205) on the circular cylinders heat transfer systems were studied experimentally. The results showed that the addition of nanoparticles and micro-rib structures can effectively improve the heat transfer efficiency, and the surface temperature of the cylinder decreases significantly. Among them, the nanofluid with a mass fraction of 0.4% shows better heat transfer performance when the number of vertical fins is 6.

Key words: heat transfer, nanoparticles, laminar flow, nanofluids, micro-rib

摘要:

为了改善传统换热器和换热介质的传热效率,通过两步法制备了不同质量分数(0.1%,0.2%,0.3%,0.4%,0.5%)的TiO2-水纳米流体,发展了不同微肋结构(竖直肋片和环形肋片)的绕流圆柱换热系统,通过实验研究了圆柱表面微肋结构的类型(竖直肋片和环形肋片)及数量(N1(2)=4,6,8)、纳米颗粒的质量分数(ω=0, 0.1%, 0.2%, 0.3%, 0.4%, 0.5%)、Reynolds数(Re=514~1205)对绕流圆柱换热系统的影响。结果表明,纳米颗粒的添加和微肋结构能有效提高传热效率,圆柱表面温度明显降低,其中质量分数为0.4%的纳米流体在竖直肋片数量为6时表现出更好的换热性能。

关键词: 传热, 纳米粒子, 层流, 纳米流体, 微肋

CLC Number: