Chemical Industry and Engineering Progress ›› 2019, Vol. 38 ›› Issue (10): 4674-4683.DOI: 10.16085/j.issn.1000-6613.2019-0058

• Materials science and technology • Previous Articles     Next Articles

Stability and heat transfer enhancement of machining use nanofluids prepared by carbon nanotube composite

Jiju GUAN1(),Jinsong CHEN1,Tao LÜ2,Xuefeng XU2   

  1. 1. Precision Manufacturing Engineering Department of Suzhou Vocational Institute of Industrial Technology, Suzhou 215104, Jiangsu, China
    2. College of Mechanical Engineering of Zhejiang University of Technology, Hangzhou 310032, Zhejiang, China.
  • Received:2019-01-09 Online:2019-10-05 Published:2019-10-05
  • Contact: Jiju GUAN

碳纳米管复合物纳米流体切削液的稳定性与强化换热

关集俱1(),陈锦松1,吕涛2,许雪峰2   

  1. 1. 苏州工业职业技术学院精密制造工程系,江苏 苏州 215104
    2. 浙江工业大学机械工程学院,浙江 杭州 310014
  • 通讯作者: 关集俱
  • 作者简介:关集俱(1985—),男,博士,副教授,研究方向为纳米流体技术研究。E-mail:daweijiju@163.com
  • 基金资助:
    江苏省自然科学基金青年基金(BK20170373);国家自然科学基金青年基金(51805345);苏州市精密检测技术重点实验室项目(SZS201815)

Abstract:

Carbon nanotubes (CNTs) composites filled with sulfurized isobutylene(T321) were synthesized, by which the cutting nanofluids used for machining were prepared. The dispersion stability, thermal conductivity and rheological property of the nanofluids were studied, and the effects of acidification time, nanoparticle type and content, surfactant and test conditions on these properties were analyzed. The results showed that the filling rate of the composites was about 25%, and the optimal ratio of the two combined surfactants of SDBS and TW-80 was 3∶7 for preparing the stably dispersed nanofluids, and the optimal ratio of the combined surfactant to the composite was 5∶1. When the acidification time of CNTs was about 9 hours and under fully and stable dispersed conditions, the heat conductivity of the base solution could be increased by 110% by the composite, and the shape factor of CNTs had a most significant influence on the heat conductivity. The nanofluid was a non-newtonian fluid, and its viscosity was the smallest when the content of the combined surfactant was about 0.5%. Compared with the nanofluid prepared by the ordinary CNTs, the thermal conductivity and viscosity of the composite nanofluid were higher and smaller mainly due to that the surface of the composite was chemically modified in the end opening and filling process, leading to the better dispersion stability of the composite in the base solution.

Key words: carbon nanotube, composites, non-newtonian fluids, stability, heat transfer

摘要:

将润滑剂硫化异丁烯(T321)填充到碳纳米管(CNTs)内以后制成复合物,再利用复合物制备了一种纳米流体切削液,研究了该纳米流体的分散稳定性、导热和黏度特性,分析了酸化处理时间、碳管微粒类型与浓度、表面活性剂、测试条件等对上述性能的影响。结果表明,T321填充CNTs时的填充率为25%左右,制备稳定分散纳米流体所需的两种表面活性剂十二烷基苯磺酸钠(SDBS)与吐温-80(TW-80)的最佳复配比例为3∶7,复配活性剂与碳管的最佳比例为5∶1。当CNTs的酸化处理时间为9h左右,且在充分、稳定分散的条件下,复合物可使基液的热导率提高110%,CNTs的形状因子对热导率的影响最为显著。所制备的纳米流体为一种非牛顿流体,当活性剂质量分数为0.5%左右时,其动力黏度最小。与普通CNTs所制备的纳米流体比,复合物纳米流体的热导率更高、黏度更小,这是由于在CNTs的开口与内部填充过程中,其表面被化学修饰,使复合物在基础液中具有更好的分散稳定性。

关键词: 碳纳米管, 复合材料, 非牛顿流体, 稳定性, 传热

CLC Number: 

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