Heat transfer and flow characteristics of nanofluid at a cooling chamber of a piston under reciprocating vibration
ZHANG Liang1,BAI Minli2
1.College of Vehicles and Energy,Yanshan University,Qinhuangdao 066004,China;
2.College of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China
Abstract：Part of heat energy produced by burning oil is transferred to the piston in a combustion engine.When the power density of the piston exceeds 0.3 kW/cm2,the piston must be cooled with a cooling chamber.In order to reveal heat transfer and flow characteristics of nanofluid in the cooling chamber,heat transfer and visualization tests with different types of nanofluid were performed in a straight circular pipe under reciprocating vibration.The test results showed that the optimal filling rate for heat transfer is 53.4%; the frequency of reciprocating vibration and the hydraulic radius of particles are all proportional to the convection heat transfer coefficient of the cooling chamber; the fluid mixure effect is the best when the rotation angle of rotor is with in 180° to 270°; the flowing disord level of nanofluid is better than that of pure water in a reciprocating vibration cycle.
张亮1,白敏丽2. 往复振荡对活塞冷却油腔内纳米流体传热及流动特性的影响[J]. 振动与冲击, 2017, 36(5): 192-198.
ZHANG Liang1,BAI Minli2. Heat transfer and flow characteristics of nanofluid at a cooling chamber of a piston under reciprocating vibration. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(5): 192-198.
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