微通道内磁流体沸腾传热特性研究.pdf

第42卷第3期
石油化工设备
Vol 42 No. 3
2013年5月
PETRO-CHEMICAL EQUIPMENT
May 2013
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试验研究
文章编号:1000-74662013)03-0001-06
微通道內磁流体沸腾传热特性研究
邓君,罗小平
华南理工大学机械与汽车工程学院,广东广州510640)
摘要:为研究磁流体在微通道中沸腾传热的规律及性质,以去离子水和质量分数为0.5%的
Fe3O4-水磁流体为实验エ质,在0,6mmX2mm的微槽道中进行对比实验研究,分析了不同的质
量流速、热流密度、磁场强度等因素对沸传热系数的影响,将实验所得数据与相关沸膀传热模型
进行对比,结果表明,随着热流密度和质量流速的增加,後槽内蔽流体的沸騰传热系数增大;实验范
国内磁场强度对徽槽内磁流体沸膀传热系数影响较小;在相同的条件下,磁流体可强化微通道内的
涕腾传热,且强化作用随雷诺数的增加而增大;以核於沸膀为主的槽相变传热计算模型的预测效
果较好
关键词:微通道;磁流体;沸腾传热;传热系数
中图分类号:TK124;TQ050
文献标志码:Adoi:10.3969/j.issn.,1000-7466.2013.03.001
Boiling Heat Transfer Characteristics of Fe3 Os Magnetic Fluid
In Rectangular Microchanne
DENG Jun, LUO Xiao-ping
(School of Mechanical and Automotive Engineering, South China University of Technology
Guangzhou 510640, China)
Abstract: To study boiling heat transfer of magnetic fluid in the micro-channel, the contrast ex-
perimental researches of phase-change heat transfer were carried out in the aluminum rectangular
micro-channels with a width of 0.6 mm and height of 2 mm. The deionized water and the water
based on Fe O, magnetic fluid with the mass fraction of.5% were used as the working fluids.
The effect of the mass flow rate, the heat flux density and the magnetic field intensity on boiling
heat transfer coefficient of magnetic fluids were investigated. Finally, the experimental data were
compared with related models of boiling heat transfer coefficient. In comparison, the boiling heat
transfer coefficient of Fe O, magnetic fluid in rectangular micro-channel increased with the in
crease of the heat flux d
mass flow rate. In experimental conditions, the boiling heat
transfer coefficient of magnetic fluid in micro-channel was little influenced by the magnetic field
intensity. It also confirmed that compared with deionized water, the boiling heat tran
cient in rectangular micro-channels can be consolidated by using the water/Fe O, magnetic fluid
and it's enhancement effect increased with the Reynolds number increased. Phase change heat
收日期:2012-12-03
甚金项目:国家自然科学基金资助项目“徽细通道多相流传热传质强化与混沌”(20676039)
作者简介:邓君(1989-),男,江西吉安人,在读硕士研究生,主要从事微小尺度换热与节能研究。