Effects of continuous sonication on laminar convective heat transfer inside a tube using water-TiO2 nanofluid
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- 作者：Hamid Reza Rayatzadeh ; Majid Saffar-Avval ; mavval@aut.ac.ir ; Mohsen Mansourkiaei ; Abbas Abbassi
- 关键词：Water TiO2 nanofluid ; Convective heat transfer ; Pressure drop ; Sonication ; Ultrasonic
- 刊名：Experimental Thermal and Fluid Science
- 出版年：2013
- 出版时间：July, 2013
- 年：2013
- 卷：48
- 期：Complete
- 页码：8-14
- 全文大小：1158 K
文摘
In this research, an experimental study is carried out to investigate the effect of adding TiO2 nanoparticles to the distilled water on convective heat transfer and pressure drop with and without continuous induced ultrasonic field in the nanofluid¡¯s reservoir under constant heat flux. Experiments are done for laminar flow regime with volume concentration, up to 0.25 % . It is observed that adding nanoparticles to the base liquid enhances Nusselt number, and more particle concentration leads to more enhancements in Nusselt number except for 0.25 % volume concentration. Results also show that the Nusselt number of the nanofluids at the volume concentration of 0.25 vol. % was approximately the same as base fluids for the given conditions. In addition, the achievements demonstrate that inducing ultrasonic field increases Nusselt numbers dramatically compared with those results obtained with no sonication. Finally, no significant increase occurs in pressure drop in the range of studied volume fractions.