MWCNT-H2O纳米流体对静态真空闪蒸制冰实验的影响

doi:10.16085/j.issn.1000-6613.2017-1971

化工进展 ›› 2018, Vol. 37 ›› Issue (07): 2531-2538.DOI: 10.16085/j.issn.1000-6613.2017-1971

MWCNT-H₂O纳米流体对静态真空闪蒸制冰实验的影响

王章飞, 章学来, 贾潇雅, 甘伟, 韩兴超, 陈跃

上海海事大学蓄冷技术研究所, 上海 201306

收稿日期:2017-09-19 修回日期:2017-10-21 出版日期:2018-07-05 发布日期:2018-07-05
通讯作者: 章学来,教授,研究方向为相变储能技术及二元冰真空制备。
作者简介:王章飞(1993-),男,硕士研究生,研究方向为二元冰真空制备。
基金资助:
国家自然科学基金（51376115）及上海海事大学研究生学术新人培育项目。

Effect of ice-making for static vacuum flash system with MWCNT-H₂O nanofluid

WANG Zhangfei, ZHANG Xuelai, JIA Xiaoya, GAN Wei, HAN Xingchao, CHEN Yue

Institute of Cool Storage Technology, Shanghai Maritime University, Shanghai 201306

Received:2017-09-19 Revised:2017-10-21 Online:2018-07-05 Published:2018-07-05

摘要/Abstract

摘要： 在蒸馏水中加入多壁碳纳米管（MWCNT）纳米粒子，选用亲水性非离子型表面活性剂TNWDIS为分散剂。经过超声波震荡，配制分散均匀稳定的MWCNT-H₂O纳米流体。利用静态真空闪蒸实验台，设定系统压力为100Pa，研究在吸附作用下多壁碳纳米管纳米粒子浓度、粒径、TNWDIS与MWCNT配比对闪蒸制取冰浆实验的影响。结果表明，多壁碳纳米管的加入可消除闪蒸制冰的相变蓄冷阶段、缩短液相降温时间使流体更早出现过冷现象；20～40nm粒径的MWCNT纳米粒子使用TNWDIS进行分散，质量分数范围在0.075%～0.15%时多壁碳纳米管纳米流体分散均匀稳定、达到最佳效果，其中质量分数为0.1%的纳米流体最大降低水的过冷度达62.2%；过冷度随着MWCNT纳米粒子粒径的增大而升高，闪蒸率基本维持在40%，但含冰率呈现非线性变化；20～40nm粒径的MWCNT纳米粒子使用TNWDIS配制成质量分数为0.1%的纳米流体，TNWDIS与MWCNT的分散配比建议采用0.5∶1，过冷度基本维持在2℃。

关键词: 纳米粒子, 吸附, 静态制冰, 含冰率, 闪蒸率, 相变

Abstract: Multi-walled carbon nanotube (MWCNT)nanoparticles were added into distilled water with hydrophilic TNWDIS of nonionic-type as surfactant. In order to get the stable homogeneous dispersions of MWCNT-H₂O nanofluid, ultrasonic generator was used. Under the condition of 100Pa and adsorption, the effects of nanofluid for different mass fractions, particle sizes of MWCNT and different ratios between MWCNT&TNWDIS on static vacuum flash characteristics of ice-making were studied. The results showed that the addition of MWCNT can eliminate the stage of phase-change and shorten the cooling time at the stage of liquid phase. So the supercooling phenomenon appeared earlier. The 20-40nm MWCNT-H₂O nanofluid which the concentration ranges from 0.075% to 0.15% can be well-distributed by TNWDIS. When the concentration of MWCNT was 0.1%, the supercooling degree of water decreased by 62.2%, which reached the maximum reduction. The supercooling degree increased with the increase of particle size, while the flash evaporating rate remained at 40%. However, ice packing factor is varied nonlinearly. The optimal dispersive proportion of TNWDIS and 20-40nm MWCNT is 0.5:1. Under this dispersive proportion, the supercooling degree of 0.1% MWCNT-H₂O nanofluids remained at 2℃.

Key words: nanoparticles, absorption, static ice-making system, ice packing factor, flash evaporating rate, phase change

中图分类号:

TK02

王章飞, 章学来, 贾潇雅, 甘伟, 韩兴超, 陈跃. MWCNT-H₂O纳米流体对静态真空闪蒸制冰实验的影响[J]. 化工进展, 2018, 37(07): 2531-2538.

WANG Zhangfei, ZHANG Xuelai, JIA Xiaoya, GAN Wei, HAN Xingchao, CHEN Yue. Effect of ice-making for static vacuum flash system with MWCNT-H₂O nanofluid[J]. Chemical Industry and Engineering Progress, 2018, 37(07): 2531-2538.

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MWCNT-H₂O纳米流体对静态真空闪蒸制冰实验的影响

Effect of ice-making for static vacuum flash system with MWCNT-H₂O nanofluid

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