摘要
为探究采用纳米流体作为冷却剂时,下朝向临界热流密度(critical heat flux,CHF)的强化效果和不同粗糙度表面的临界热流密度强化特性。实验制备了4种纳米流体,利用扫描电镜和纳米粒度分析仪分别检测纳米颗粒粒径和基液中颗粒分散状况。试验段采用316不锈钢钢板,以恒电流控制电加热方式进行常压下朝向水平0°池沸腾实验。实验结果表明:体积分数为0.001%的二氧化钛纳米流体的临界热流密度强化效果最为明显,约为61%;表面粗糙度(Ra)在0.086~1.765μm时,临界热流密度强化效果随Ra增加而降低,当Ra达到2.287μm时,所对应的CHF强化效果出现增加趋势。
In order to explore the enhancement effect of nanofluids on downward facing critical heat flux and the relation between roughness Ra and CHF enhancement characteristics,four kinds of nanofluids were chosen as preparing materials,scanning electron microscope and nano-particle size analyzer were utilized to detect particle diameter and dispersion effect respectively. The test plate made of 316 stainless steel was heated by constant current,the pooling boiling experiment was conducted on downward horizontal facing at room temperature and pressure. The results show that the volume concentration of 10^-3% TiO2 nanofluids get the best enhancement of critical heat flux,about 61%.When the surface roughness（ Ra） ranges from 0.086μm to 1.765 μm,the CHF enhancement effect decreases following the rise of Ra; when Ra reaches 2.287 μm,the corresponding CHF enhancement effect tends to decrease.
出处
《应用科技》
CAS
2017年第1期82-86,共5页
Applied Science and Technology
关键词
纳米流体
池沸腾
临界热流密度
强化
粗糙度
nanofluids
pooling boiling
critical heat flux
enhancement
roughness
