Experimental study on CuO nanoparticles in distilled water and its effect on heat transfer on a vertical surface

被引：3
|
作者：
Hegde, Ramakrishna N. [1 ]
Rao, Srikanth S. [2 ]
Reddy, R. P. [3 ]
机构：
[1] MS Ramaiah Inst Technol, Dept Mech Engn, Bangalore 560054, Karnataka, India
[2] Natl Inst Technol, Dept Mech Engn, Surathkal 575025, India
[3] Reva Inst Technol, Bangalore 560064, Karnataka, India
来源：
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY | 2011年 / 25卷 / 11期
关键词：
CuO nanofluid; Pool boiling; Surface roughness; Vertical surface; POOL BOILING CHARACTERISTICS; ENHANCEMENT; FLUX;
D O I：
10.1007/s12206-011-0719-y
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
The pool boiling characteristics of dilute dispersions of CuO nanoparticles in water were studied at atmospheric pressure on a vertical heating surface. Experimental investigation of different weight concentrations of nanoparticles revealed significant enhancement in heat flux and deterioration in pool boiling. Out of many reasons, nanoparticles coating the heater surface was believed to be the reason behind this. Subsequent inspection of the heater surface showed nanoparticles coating the surface, forming a porous layer. To substantiate the nanoparticle deposition and its effect on heat flux, an investigation was performed by measuring the surface roughness of the heater surface before and after the experiment. While SEM images of the heater surface revealed nanoparticle deposition, measurement of surface roughness of the heater surface confirmed it. Formation of the porous layer on the heater surface as revealed by SEM images provided an excellent location for nucleation sites enhancing heat transfer. However, deterioration in nucleate boiling at different weight concentrations indicated some phenomenon is working behind this.
引用
收藏
页码：2927 / 2934
页数：8
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