The characteristics and correlation of nanofluid flow boiling critical heat flux
The characteristics and correlation of nanofluid flow boiling critical heat flux
复制标题
纳米流体流动沸腾临界热流密度特征及相关性
DOI：
10.1016/j.ijheatmasstransfer.2018.01.118
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发表时间：
2018
影响因子：
5.2
通讯作者：
Qiu Suizheng
中科院分区：
文献类型：
--
作者：
Wang Yun;Deng Kuanghan;Wu Junmei;Su Guanghui;Qiu Suizheng
纳米流体作为一种优异的工质，自其基于纳米技术提出以来，就受到了广泛的关注。流动沸腾是传热系统中常见的现象，临界热流密度是热工水力设计的关键参数。然而，目前对纳米流体流动沸腾临界热流密度的研究还不够充分，也没有针对纳米流体流动沸腾的临界热流密度关联式。因此，实验研究了纳米流体流动沸腾的临界热流密度在一个垂直的管考虑出口压力，质量流量，入口过冷度，加热长度和直径，纳米颗粒的类型和浓度。结果表明，纳米流体流动沸腾的临界热流密度比基础流体提高了18%，且随质量流量、直径和压力的增大以及加热长度的减小而增大.此外，入口过冷度、纳米颗粒类型（Al 2 O3、AlN）和浓度（0.1体积%、0.5体积%）几乎没有显著影响。此外，从液层粘附和纳米颗粒沉积的角度解释了这种增加。根据实验结果，提出了一个具有较好精度和适用性的纳米流体流动沸腾临界热流密度关联式。
As a preeminent working fluid, nanofluid has been attracted great attention since it was proposed based on nanotechnology. Flow boiling is familiar in heat transfer system and the critical heat flux is a key parameter for the design of thermal hydraulic. However, the research on the critical heat flux of nanofluid flow boiling is insufficient and no correlation is proposed for nanofluid flow boiling. Thus, the critical heat flux of nanofluid flow boiling is experimentally investigated in a vertical tube with the consideration of outlet pressure, mass flux, inlet subcooling, heating length and diameter, nanoparticle type and concentration. The results indicate that the critical heat flux of nanofluid flow boiling is enhanced (up to 18% in present work) compared with base fluid and the increasing radio is increased with increasing the mass flux, diameter and pressure, and with decreasing the heating length. In addition, the inlet subcooling, nanoparticle types (Al2O3, AlN) and concentrations (0.1 vol%, 0.5 vol%) have almost no significant influence. Moreover, the increasing is explained from the view point of adhering of liquid sublayer and deposition of nanoparticles. Furthermore, a correlation of nanofluid flow boiling critical heat flux is proposed by the experimental results with excellent accuracy and applicability.