Analysis of flow and heat transfer characteristics of nanofluids surface tension driven convection in a rectangular cavity. (April 2019)

• Record Type: Journal Article
• Authors: Jiang, Yanni; Zhou, Xiaoming
• Is Part Of: International journal of mechanical sciences. Volume 153/154(2019)
• Page Start: 154
• Page End: 163
• Publication Date: 2019-04
• Subjects: Nanofluids -- Surface tension driven convection -- Two-phase mixture model -- Nusselt number -- Entropy generation; Mechanical engineering -- Periodicals; Génie mécanique -- Périodiques; Mechanical engineering; Maschinenbau; Mechanik; Zeitschrift; Periodicals; 621.05
• DOI: 10.1016/j.ijmecsci.2019.01.034
• Languages: English
• ISSNs: 0020-7403

Abstract

Highlights: Flow and heat transfer of nanofluids surface tension driven convection is studied. Convective intensity for distilled water–Al2 O3 indicates a nonmonotonic change with nanoparticles. Convective intensity for PGW–ZnO indicates a monotonic change with nanoparticles. The effect of nanoparticles on surface tension has a significant influence on nanofluids surface tension driven convection. Abstract: The addition of nanoparticles into base fluid not only can improve thermophysical properties, but also can change its surface tension, so the flow and heat transfer of nanofluids surface tension driven convection can be significantly influenced by nanoparticles. The present paper reports the analysis of flow and heat transfer of nanofluids surface tension driven convection in a rectangular cavity, in which two types of nanofluids of distilled water–Al2 O3 and PGW(60% propylene glycol and 40% water by mass)-ZnO are considered, and the two-phase Mixture model is used to simulate the nanofluids flow. The computational results show that, for nanofluid distilled water–Al2 O3, the convective intensity and heat transfer performance indicates a nonmonotonic change with nanoparticles volume fraction increasing, however, for nanofluid PGW–ZnO the convective intensity and heat transfer performance decreases monotonously. Moreover, the flow characteristics and entropy generation under different nanoparticles volume fractions are analyzed in detail. Graphical abstract: Image, graphical abstract