Quenching boiling of aqueous suspensions with carbon nanotubes

doi:10.3969/j.issn.0438-1157.2013.05.009

CIESC Journal ›› 2013, Vol. 64 ›› Issue (5): 1566-1572.DOI: 10.3969/j.issn.0438-1157.2013.05.009

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Quenching boiling of aqueous suspensions with carbon nanotubes

LI Danyang¹, ZHU Yuanzheng¹, ZHANG Liang¹, FAN Liwu¹, XU Xu², YU Zitao¹, HONG Ronghua¹, HU Yacai¹

1. Institute of Thermal Science and Power Systems, Zhejiang University, Hangzhou 310027, Zhejiang, China;
2. College of Metrological and Measurement Engineering, China Jiliang University, Hangzhou 310018, Zhejiang, China

Received:2012-08-13 Revised:2012-09-26 Online:2013-05-05 Published:2013-05-05
Supported by:
supported by the National Natural Science Foundation of China(51206142, 51106144)and the China Postdoctoral Science Foundation(2012M511362).

水基碳纳米管悬浮液的淬火沸腾特性

李旦洋¹, 朱元正¹, 张良¹, 范利武¹, 徐旭², 俞自涛¹, 洪荣华¹, 胡亚才¹

1. 浙江大学热工与动力系统研究所, 浙江杭州 310027;
2. 中国计量学院计量测试工程学院, 浙江杭州 310018

通讯作者: 范利武
作者简介:李旦洋(1989-),男,硕士研究生。
基金资助:
国家自然科学基金项目(51206142,51106144);中国博士后科学基金项目(2012M511362)。

Abstract

Abstract: In order to examine the combined effects of surface roughness and concentration on pool boiling of nanoparticle suspensions, an experimental study on quenching processes of aqueous suspensions with carbon nanotubes(0.1% and 0.5%)was conducted using nickel-plated copper spheres with surface roughness of Ra0.5 and Ra12.5.Quenching curves were acquired directly and boiling curves during the quenching processes were calculated based on a lumped capacitance model.It is shown that increase in both concentration of suspensions and surface roughness expedites quenching speed and enhances critical heat flux.Increase in surface roughness decreases the time duration of nucleate boiling and less film boiling time is primarily due to increased concentration.The combined effects of surface roughness and concentration suggest that quenching objects are utilized with rough surfaces in nanoparticle suspensions of relatively high concentration so as to significantly shorten the quenching time for engineering applications.

Key words: carbon nanotube suspensions, pool boiling, quenching, critical heat flux, surface roughness

摘要： 为了研究表面粗糙度及浓度对纳米悬浮液大容器沸腾特性的耦合影响,对粗糙度为Ra0.5和Ra12.5的镀镍铜球在体积分数为0.1%和0.5%的水基碳纳米管悬浮液中的淬火过程进行了实验研究,得到了不同条件下的淬火曲线并通过集总参数模型得到了淬火过程的沸腾曲线。结果表明,悬浮液浓度与表面粗糙度的增加都能加快淬火速率并提高临界热通量。表面粗糙度的增加缩短了核态沸腾阶段的时间,而悬浮液浓度的增加则主要体现了对膜态沸腾阶段的加速作用。在二者的共同影响下,采用表面较为粗糙的淬火物体在浓度较高的纳米悬浮液中进行淬火可以显著地缩短淬火冷却时间,对工程应用具有指导意义。

关键词: 碳纳米管悬浮液, 大容器沸腾, 淬火, 临界热通量, 表面粗糙度

CLC Number:

TK124

LI Danyang, ZHU Yuanzheng, ZHANG Liang, FAN Liwu, XU Xu, YU Zitao, HONG Ronghua, HU Yacai. Quenching boiling of aqueous suspensions with carbon nanotubes[J]. CIESC Journal, 2013, 64(5): 1566-1572.

李旦洋, 朱元正, 张良, 范利武, 徐旭, 俞自涛, 洪荣华, 胡亚才. 水基碳纳米管悬浮液的淬火沸腾特性[J]. 化工学报, 2013, 64(5): 1566-1572.

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Quenching boiling of aqueous suspensions with carbon nanotubes

水基碳纳米管悬浮液的淬火沸腾特性

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