Experimental research on stabilities, thermophysical properties and heat transfer enhancement of nanofluids in heat exchanger systems

doi:10.1016/j.cjche.2018.03.021

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (12): 2420-2430.DOI: 10.1016/j.cjche.2018.03.021

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

Experimental research on stabilities, thermophysical properties and heat transfer enhancement of nanofluids in heat exchanger systems

Cong Qi, Maoni Liu, Guiqing Wang, Yuhang Pan, Lin Liang

School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China

收稿日期:2018-01-11 修回日期:2018-03-03 出版日期:2018-12-28 发布日期:2019-01-09
通讯作者: Cong Qi
作者简介:Maoni Liu,liumaoni@cumt.edu.cn;Guiqing Wang,gqwang@cumt.edu.cn;Yuhang Pan,panyuhang@cumt.edu.cn;Lin Liang,lianglin@cumt.edu.cn.
基金资助:
Supported by the National Natural Science Foundation of China (51606214).

Experimental research on stabilities, thermophysical properties and heat transfer enhancement of nanofluids in heat exchanger systems

Cong Qi, Maoni Liu, Guiqing Wang, Yuhang Pan, Lin Liang

School of Electrical and Power Engineering, China University of Mining and Technology, Xuzhou 221116, China

Received:2018-01-11 Revised:2018-03-03 Online:2018-12-28 Published:2019-01-09
Contact: Cong Qi
Supported by:
Supported by the National Natural Science Foundation of China (51606214).

摘要/Abstract

摘要： Stable TiO₂-water nanofluids are prepared by a two-step method, stabilities of nanofluids are investigated by precipitation method and transmittance method respectively, and thermal conductivities and viscosities are also measured. An experimental system for studying the heat transfer enhancement of nanofluids is established, and heat transfer and flow characteristics of TiO₂-water nanofluids in heat exchanger systems with a triangular tube and circular tube are experimentally studied. The effects of nanoparticle mass fractions (ω=0.1 wt%-0.5 wt%) and Reynolds numbers (Re=800-10000) on the heat transfer and flow performances of nanofluids are analyzed. Fitting formulas for Nusselt number and resistance coefficient of nanofluids in a triangular tube are put forward based on the experimental data. The comprehensive performances of nanofluids in a triangular tube are investigated. It is found that nanofluids in a triangular tube can significantly improve the heat transfer performance at the cost of a small increase in resistance coefficient compared with that in a circular tube, especially the resistance coefficients are almost the same between different nanoparticle mass fractions at turbulent flow. It is also found that the comprehensive evaluation index η decreases with Reynolds number at laminar flow but a critical maximum value appears at turbulent flow.

关键词: Heat transfer, Nanoparticles, Turbulent flow, Triangular tube, Comprehensive evaluation index

Abstract: Stable TiO₂-water nanofluids are prepared by a two-step method, stabilities of nanofluids are investigated by precipitation method and transmittance method respectively, and thermal conductivities and viscosities are also measured. An experimental system for studying the heat transfer enhancement of nanofluids is established, and heat transfer and flow characteristics of TiO₂-water nanofluids in heat exchanger systems with a triangular tube and circular tube are experimentally studied. The effects of nanoparticle mass fractions (ω=0.1 wt%-0.5 wt%) and Reynolds numbers (Re=800-10000) on the heat transfer and flow performances of nanofluids are analyzed. Fitting formulas for Nusselt number and resistance coefficient of nanofluids in a triangular tube are put forward based on the experimental data. The comprehensive performances of nanofluids in a triangular tube are investigated. It is found that nanofluids in a triangular tube can significantly improve the heat transfer performance at the cost of a small increase in resistance coefficient compared with that in a circular tube, especially the resistance coefficients are almost the same between different nanoparticle mass fractions at turbulent flow. It is also found that the comprehensive evaluation index η decreases with Reynolds number at laminar flow but a critical maximum value appears at turbulent flow.

Key words: Heat transfer, Nanoparticles, Turbulent flow, Triangular tube, Comprehensive evaluation index

Cong Qi, Maoni Liu, Guiqing Wang, Yuhang Pan, Lin Liang. Experimental research on stabilities, thermophysical properties and heat transfer enhancement of nanofluids in heat exchanger systems[J]. Chinese Journal of Chemical Engineering, 2018, 26(12): 2420-2430.

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Experimental research on stabilities, thermophysical properties and heat transfer enhancement of nanofluids in heat exchanger systems

Experimental research on stabilities, thermophysical properties and heat transfer enhancement of nanofluids in heat exchanger systems

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