卞永宁

个人信息Personal Information

教授

硕士生导师

性别:男

毕业院校:山口大学

学位:博士

所在单位:力学与航空航天学院

学科:流体力学. 化学工程

办公地点:大连本部 力学楼510

盘锦校区 D07-306B

联系方式:1.大连理工大学运载工程与力学学部力学系流体力学研究室 2.大连理工大学盘锦校区海洋科学与技术学院 Mobile:18641136292 Office: 0411-84707330 Home: 0411-84748119

电子邮箱:ybian@dlut.edu.cn

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随活塞同步振动下纳米流体的强化传热特性

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发表时间:2013-01-01

发表刊物:实验流体力学

期号:4

页面范围:32-39

ISSN号:1672-9897

摘要:In the whole working process of combustion engine, heat energy is produced and part of which transfers to combustion chamber. More than half of that energy transfers to the piston. Therefore, piston needs to be cooled efficiently with increase of thermal loading of combustion engine. When the power density of the piston exceeds 0.3 kW/cm2, the piston must be cooled by cooling chamber. In order to reveal the flow and heat transfer characteristic of nanofluids in cooling chamber, experiments about physical properties, friction drag and heat transfer rates with different types of nanofluids were carried out in a straight circular pipe under steady and vibration state. It is found that, in the steady state, the friction factor of low mass concentration nanofluids is slightly increased for laminar flow by adding nanoparticles into purified water, while almost has no change for turbulent flow. However, the coefficient of heat transfer is enhanced. It is also found that the optimal enhancement appears nearby the turning point of laminar-turbulent flow and increases as mass concentration of nanofluids and coefficient of heat conductivity increase. When heat transfer chamber vibrates synchronously with piston, heat transfer enhancement coefficient is proportional to vibrational frequency and inversely to the Reynolds number. Using the nanofluids instead of purified water, heat transfer is significantly enhanced and the type of nanofluid has a major impact on the heat transfer effect.

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