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- Title
通道形状对活塞冷却油腔内工作流体阻力及 流动特性的影响.
- Authors
张亮; 原亚东; 孙志强; 李徐佳; 陈贺敏
- Abstract
In order to reveal the effects of channel shape on resistances and flow characteristics of working fluids in piston cooling oil cavities,a straight wall channel was changed into the wave-walled channel,and experimental studies were carried out by pressure difference and visualization methods. The experimental results of pressure difference show that the water in wave-wall channel leads to an earlier transition point of laminar flow to turbulence compared with the flow of water in straight wall channel,and the transition point is brought forward again when non-Newtonian fluid is as the working fluids instead of water. The experimental results of visualization show that the working fluid in the wave-wall channel may observe the unstable flow pattern when the Reynolds number is low. In order to further enhance the process of heat and mass transfer at low Reynolds numbers,the flow characteristics of non-Newtonian fluid in the wave-walled channel were studied under pulsating flow field by experiments and numerical simulation. The results show that the operation parameters of the pulsating flow field have significant influences on instability rate of flow for non-Newtonian in the wave-wall channel,and further impact on the mass transfer.
- Subjects
NON-Newtonian fluids; LAMINAR flow; HYDRAULICS; MASS transfer; WORKING fluids; NON-Newtonian flow (Fluid dynamics)
- Publication
China Mechanical Engineering, 2019, Vol 30, Issue 11, p1322
- ISSN
1004-132X
- Publication type
Article
- DOI
10.3969/j.issn.l004-132X.2019.11.009