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

doi:10.11949/0438-1157.20200916

Abstract

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:

TK 124

QI Cong, LI Ke'ao, LI Chunyang. Influence of micro-rib structures on thermal performance of nanofluids flowing around circular cylinders[J]. CIESC Journal, 2021, 72(4): 2006-2017.

齐聪, 李可傲, 李春阳. 微肋结构对纳米流体绕流圆柱热性能的影响[J]. 化工学报, 2021, 72(4): 2006-2017.

Figures/Tables 14

Fig.1 Rheological curves of various fluids

Fig.2 Effects of dispersant and NaOH on physical properties

Table 1 Physical properties of nanofluids

种类	ρ/(kg·m^-3)	c_p/(J·kg^-1·K^-1)	μ/(Pa·s)	λ/(W·m^-1·K^-1)
去离子水	997.1	4179	0.001004	0.6130
TiO₂ 纳米颗粒	4250	686.2	─	8.9538
0.1%TiO₂纳米流体	997.9	4178.2	0.0010046	0.6134
0.2%TiO₂纳米流体	998.6	4177.4	0.0010052	0.6137
0.3%TiO₂纳米流体	999.4	4176.5	0.0010058	0.6141
0.4%TiO₂纳米流体	1000.2	4175.7	0.0010064	0.6144
0.5%TiO₂纳米流体	1000.9	4174.9	0.001007	0.6148

Fig.3 TiO2 nanofluids before and after standing

Table 2 Detail information of experimental instrument

仪器	制造商	特性
热电偶	OMEGA	型号：T型；测温范围：0~200℃；精度：±0.1%
数据采集器	Agilent	型号：34970；通道数目：22个；精度：±0.004%
低温恒温槽	上海衡平	型号：DC-2030A；可调温度范围：-20~100℃；精度：±0.02℃
直流电源	MAISHENG	输入电压：AC220V±10%；工作环境：-10~70℃；精度：±5%
流量计	双环	型号：LZB-6；精度：±1%
压差传感器	重庆伟岸	测量范围：60~40 MPa；精度：±0.25%

Fig.4 Schematic diagram of experimental system

Fig.5 Experimental verification

Fig.6 Changes of circular cylinder surface temperature with Reynolds number

Fig. 7 Changes of Nusselt number with Reynolds number without micro-rib structures

Fig.8 Changes of resistance coefficient with Reynolds number without micro-rib structures

Fig. 9 Changes of thermal enhancement factor with Reynolds number without micro-rib structures

Fig.10 Changes of Nusselt number with Reynolds number with micro-rib structures

Fig.11 Changes of resistance coefficient with Reynolds number with micro-rib structures

Fig.12 Changes of thermal enhancement factor with Reynolds number with micro-rib structures

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