Investigation of nanoparticle diameter influences on performance of hydrodynamic journal bearings operating with nanolubricant

Abdurrahim Dal
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Abstract

The nanolubricant's effectiveness on the bearings’ performance depends on the types of nanoparticles, volume ratio, and their size and/or diameter. Although the nanolubricant influences on the characteristics of the journal bearings are well known, cost-effective solutions for using nanolubricants, have continued to need in industrial applications. Because the nanoparticle's diameter plays a key role in the fluid with nanoparticle additives, research on its effect is important for hydrodynamic journal bearing. In this work, the nanoparticle diameter impacts on the characteristics of the hydrodynamic journal bearings are investigated with under thermal effects. At first, four hydrodynamic journal bearings have different parameters such as radial clearance and bearing length–diameter ratio are considered and designed. Then, the lubricant flow through the radial clearance is modeled with Dowson's equation. Besides, the temperature field in the journal and the lubricant are governed by the heat conduction and energy equations, respectively. The physical and thermal properties of the nanolubricant are expressed by considering nanoparticle diameter and the volume ratio. Then, an algorithm is developed to solve the mathematical models based on the finite difference method. Finally, a serial simulation is conducted under different nanoparticle diameters and operational conditions. When the nanoparticle diameter becomes small, the temperature and pressure values of the nanolubricant, load capacity, and stiffness increase.
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纳米颗粒直径对使用纳米润滑剂的流体动力轴颈轴承性能影响的研究
纳米润滑剂对轴承性能的影响取决于纳米颗粒的类型、体积比及其大小和/或直径。尽管纳米润滑剂对轴颈轴承特性的影响已众所周知,但在工业应用中仍需要使用具有成本效益的纳米润滑剂解决方案。由于纳米粒子的直径在含有纳米粒子添加剂的流体中起着关键作用,因此对其影响的研究对流体动力轴颈轴承非常重要。在这项工作中,研究了纳米颗粒直径在热效应下对流体动力轴颈轴承特性的影响。首先,考虑并设计了四个具有不同径向游隙和轴承长径比等参数的流体动力轴颈轴承。然后,利用 Dowson 方程对通过径向间隙的润滑油流进行建模。此外,轴颈和润滑剂中的温度场分别由热传导方程和能量方程控制。纳米润滑剂的物理和热特性通过考虑纳米颗粒直径和体积比来表示。然后,开发了一种基于有限差分法求解数学模型的算法。最后,在不同的纳米颗粒直径和工作条件下进行了连续模拟。当纳米颗粒直径变小时,纳米润滑剂的温度和压力值、负载能力和刚度都会增加。
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来源期刊
CiteScore
4.20
自引率
5.00%
发文量
110
审稿时长
6.1 months
期刊介绍: The Journal of Engineering Tribology publishes high-quality, peer-reviewed papers from academia and industry worldwide on the engineering science associated with tribology and its applications. "I am proud to say that I have been part of the tribology research community for almost 20 years. That community has always seemed to me to be highly active, progressive, and closely knit. The conferences are well attended and are characterised by a warmth and friendliness that transcends national boundaries. I see Part J as being an important part of that community, giving us an outlet to publish and promote our scholarly activities. I very much look forward to my term of office as editor of your Journal. I hope you will continue to submit papers, help out with reviewing, and most importantly to read and talk about the work you will find there." Professor Rob Dwyer-Joyce, Sheffield University, UK This journal is a member of the Committee on Publication Ethics (COPE).
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