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论文类型：期刊论文

发表时间：2017-01-01

发表刊物：EXPERIMENTAL THERMAL AND FLUID SCIENCE

收录刊物：SCIE、EI

卷号：80

页面范围：155-167

ISSN号：0894-1777

关键字：Piston; Cooling gallery; Nanofluid; Reciprocating motion; Visualization

摘要：In the current work, a high-speed camera was employed to capture the flow patterns of nanofluids inside a simplified piston gallery at various crank angles. The heat transfer mechanisms of gas-liquid-solid three-phase flow (air, base fluid, and nanoparticles) during reciprocating motion was explored. The effects of oscillation frequency, nanofluid filling ratio, and nanoparticle concentration were also discussed. The addition of nanoparticles into a base fluid enhances the heat and mass transfer processes effectively. Of all the three determining factors of the flow field during the reciprocating motion, the oscillation frequency plays a major role, the nanoparticle concentration plays a minor role and the nanofluid filling ratio lies in between. (C) 2016 Elsevier Inc. All rights reserved.