Effect of Carbon Nanotube Concentration on Cooling Behaviors of Oil-Based Nanofluids During the Immersion Quenching

doi:10.1007/s12204-017-1852-2

上海交通大学学报（英文版） ›› 2017, Vol. 22 ›› Issue (4): 395-401.doi: 10.1007/s12204-017-1852-2

Effect of Carbon Nanotube Concentration on Cooling Behaviors of Oil-Based Nanofluids During the Immersion Quenching

CHEN Si¹* (陈斯), ZENG Xiaoshu¹ (曾效舒), YUAN Qiuhong² (袁秋红)

(1. Department of Materials Forming & Controlling Engineering, Nanchang University, Nanchang 330031, China; 2. Physical Science and Technology College, Yichun University, Yichun 336000, Jiangxi, China)

出版日期:2017-08-03 发布日期:2017-08-03
通讯作者: CHEN Si (陈斯) E-mail:781571930@qq.com

Effect of Carbon Nanotube Concentration on Cooling Behaviors of Oil-Based Nanofluids During the Immersion Quenching

CHEN Si¹* (陈斯), ZENG Xiaoshu¹ (曾效舒), YUAN Qiuhong² (袁秋红)

(1. Department of Materials Forming & Controlling Engineering, Nanchang University, Nanchang 330031, China; 2. Physical Science and Technology College, Yichun University, Yichun 336000, Jiangxi, China)

Online:2017-08-03 Published:2017-08-03
Contact: CHEN Si (陈斯) E-mail:781571930@qq.com

摘要/Abstract

摘要： Abstract: Oil-based nanofluids including 0.75%—1.75% (mass fraction) carbon nanotubes (CNTs) without any surfactants have been synthesized by a two-step process. The probes machined from 45# steel with 22mm diameter and 50mm length are quenched in the as-synthesized CNT nanofluids for testing the cooling behaviors of the nanofluids. The laser diffraction particle size analyzer, scanning electronic microscope (SEM), X-ray diffractometer and transmission electron microscope (TEM) are used to characterize the quality and distribution of CNTs in the nanofluids. The wettability and viscosity of 30# oil and oil-based CNT nanofluids are measured by a goniometer at 15 °C and a rotational type viscometer at 40 °C, respectively. The results show that the cooling efficiency of the oil-based CNT nanofluids is better than that of 30# oil. Moreover, the cooling rate of the naonofluids increases with the further increase of the CNT concentration. When the mass fraction of CNTs increases to 1.75%, the cooling rate of the naonofluids reaches a maximum at 760 °C and it is increased by 77.8% as compared to that of base oil. The improved cooling rate of oil by CNTs is mainly due to the uniform distribution and excellent thermal conductivity of CNTs.

关键词: carbon nanotube (CNT), nanofluid, quenching, cooling behavior, concentration

Abstract: Abstract: Oil-based nanofluids including 0.75%—1.75% (mass fraction) carbon nanotubes (CNTs) without any surfactants have been synthesized by a two-step process. The probes machined from 45# steel with 22mm diameter and 50mm length are quenched in the as-synthesized CNT nanofluids for testing the cooling behaviors of the nanofluids. The laser diffraction particle size analyzer, scanning electronic microscope (SEM), X-ray diffractometer and transmission electron microscope (TEM) are used to characterize the quality and distribution of CNTs in the nanofluids. The wettability and viscosity of 30# oil and oil-based CNT nanofluids are measured by a goniometer at 15 °C and a rotational type viscometer at 40 °C, respectively. The results show that the cooling efficiency of the oil-based CNT nanofluids is better than that of 30# oil. Moreover, the cooling rate of the naonofluids increases with the further increase of the CNT concentration. When the mass fraction of CNTs increases to 1.75%, the cooling rate of the naonofluids reaches a maximum at 760 °C and it is increased by 77.8% as compared to that of base oil. The improved cooling rate of oil by CNTs is mainly due to the uniform distribution and excellent thermal conductivity of CNTs.

Key words: carbon nanotube (CNT), nanofluid, quenching, cooling behavior, concentration

中图分类号:

TG 154.4

CHEN Si* (陈斯), ZENG Xiaoshu (曾效舒), YUAN Qiuhong (袁秋红). Effect of Carbon Nanotube Concentration on Cooling Behaviors of Oil-Based Nanofluids During the Immersion Quenching[J]. 上海交通大学学报（英文版）, 2017, 22(4): 395-401.

CHEN Si* (陈斯), ZENG Xiaoshu (曾效舒), YUAN Qiuhong (袁秋红). Effect of Carbon Nanotube Concentration on Cooling Behaviors of Oil-Based Nanofluids During the Immersion Quenching[J]. Journal of shanghai Jiaotong University (Science), 2017, 22(4): 395-401.

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Effect of Carbon Nanotube Concentration on Cooling Behaviors of Oil-Based Nanofluids During the Immersion Quenching

Effect of Carbon Nanotube Concentration on Cooling Behaviors of Oil-Based Nanofluids During the Immersion Quenching

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