NUMERICAL INVESTIGATION OF HEAT-TRANSFER ENHANCEMENT IN A DIMPLED DIVERGING MICROCHANNEL WITH AL2O3-WATER NANOFLUID

被引:13
作者
Nandakrishnan, S. L. [1 ]
Deepu, M. [1 ]
Shine, S. R. [1 ]
机构
[1] Indian Inst Space Sci & Technol, Dept Aerosp Engn, Trivandrum 695547, Kerala, India
关键词
dimpled microchannel; diverging microchannel; nanofluid; heat-transfer enhancement; enhancement factor; thermal performance factor; multiple passive enhancements; THERMAL-CONDUCTIVITY; FLOW-THROUGH; FLUID-FLOW; PERFORMANCE; SINK;
D O I
10.1615/JEnhHeatTransf.2018021322
中图分类号
O414.1 [热力学];
学科分类号
摘要
Recent interest in high heat-flux removal applications in micropower devices and electronic cooling applications have contributed to the development of heat-transfer enhancement techniques in microchannels. Passive enhancement methods have been widely used by researchers to improve microchannel heat-transfer characteristics. The incorporation of multiple enhancement methods in microchannel heat sinks has proven to be advantageous in high heat-flux removal systems. The present study focuses on the application of improved heat-transfer properties of Al2O3-water nanofluids when used in conjunction with a diverging microchannel with a staggered dimpled surface to improve overall heat-transfer characteristics. We analyzed three-dimensional laminar incompressible internal convection flow field in a diverging microchannel with heat transfer from a dimpled surface using the SIMPLE algorithm with a second-order upwind scheme in a finite volume solver. We performed extensive computations to reveal thermohydraulic performance aspects of dimpled diverging microchannels for various heat- and mass-flux conditions. Our study was extended to analyze performance augmentation that is achieved when Al2O3-water nanofluids are used in such channels.
引用
收藏
页码:347 / 365
页数:19
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