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Impact of partial surface waviness on the tribological performance of hydrodynamic journal bearing 局部表面波纹度对流体动压滑动轴承摩擦学性能的影响
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2022-12-04 DOI: 10.1002/ls.1633
Arun Bangotra, Sanjay Sharma
{"title":"Impact of partial surface waviness on the tribological performance of hydrodynamic journal bearing","authors":"Arun Bangotra,&nbsp;Sanjay Sharma","doi":"10.1002/ls.1633","DOIUrl":"10.1002/ls.1633","url":null,"abstract":"<p>In this paper, the static performance analysis of journal bearing having full and partial surface waviness has been presented. The surface waviness is to be considered in the full, first half, second half, and pressure-increasing and decreasing regions of the bearing for analysis. The effect of surface waviness is considered by modifying the lubricant flow governing Reynolds equation with the film thickness equation and it is solved with the finite element method to get performance parameters like bearing load capacity, friction coefficient, and so forth operating under eccentricity ratios range of 0.2–0.8. The waviness geometrical parameters like waviness numbers and amplitudes are also considered in circumferential, axial, and both directions in the selected regions. The maximum performance has been found for waviness in the full and pressure-increasing region in the circumferential direction at a high eccentricity ratio.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"35 3","pages":"207-224"},"PeriodicalIF":1.9,"publicationDate":"2022-12-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44003550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Effect of copper nanoparticle concentration on tribological performances of cylinder liner piston ring 铜纳米颗粒浓度对气缸套活塞环摩擦学性能的影响
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2022-11-30 DOI: 10.1002/ls.1634
Huabing Yin, Xuecheng Zhang, Zhiwei Guo, Zhongzhi Liu, Xiang Rao, Chengqing Yuan
{"title":"Effect of copper nanoparticle concentration on tribological performances of cylinder liner piston ring","authors":"Huabing Yin,&nbsp;Xuecheng Zhang,&nbsp;Zhiwei Guo,&nbsp;Zhongzhi Liu,&nbsp;Xiang Rao,&nbsp;Chengqing Yuan","doi":"10.1002/ls.1634","DOIUrl":"10.1002/ls.1634","url":null,"abstract":"<p>The performance of cylinder liner piston ring (CLPR) that worked under harsh conditions significantly affected the reliability of diesel engines. Nano-copper lubricant additives have recently been introduced due to their good anti-wear properties. This study aims to gain insights into the interactions between concentrations of nano-copper lubricant additives and the tribological performance of CLPR. Tests are performed on a reciprocating sliding test rig under different operating conditions, and the tribological performances are characterized by the friction coefficient, wear mass losses, and morphologies of worn surface. The experimental results indicated that the optimal concentration of nano-copper additives is 2 wt%. Additionally, deposition of the Cu nanoparticles on the worn surface during the friction process facilitates the formation of the mending layer. These findings would aid to provide a technical reference for the application of nano-copper additives in diesel engines.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"35 4","pages":"225-236"},"PeriodicalIF":1.9,"publicationDate":"2022-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41485713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Tribology of dust-stop seals of mixing machines 混合机防尘密封的摩擦学
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2022-11-17 DOI: 10.1002/ls.1632
Ehsan Fatourehchi, Hamed Shahmohamadi, Ramin Rahmani, Homer Rahnejat, Mark Johnson, Ian Wilson
{"title":"Tribology of dust-stop seals of mixing machines","authors":"Ehsan Fatourehchi,&nbsp;Hamed Shahmohamadi,&nbsp;Ramin Rahmani,&nbsp;Homer Rahnejat,&nbsp;Mark Johnson,&nbsp;Ian Wilson","doi":"10.1002/ls.1632","DOIUrl":"10.1002/ls.1632","url":null,"abstract":"<p>Dust stop seals are widely used in powder and rubber mixing industries. Design of the sealing system requires a continuous supply of pressurised lubricant, which is not recycled because of the risk of contamination. There is also the potential of large volume leakage of oil due to poor sealing, increasing operational costs and necessitating remedial measures to avoid environmental protection. Furthermore, the seal faces are prone to failure in relatively short periods of time due to reduced gap and lubricant leakage. The paper presents an analytical method and numerical predictions based on Reynolds equation under combined hydrodynamic and hydrostatic conditions with the entrant lubricant through hydraulically loaded feedholes. The validity of these methods is ascertained through comparison with a more complex but time-consuming solution of Navier–Stokes equations. The numerical predictions allow for determining the prevailing tribological contact conditions and assessing its suitability for evaluating the sealing performance of mixing machinery.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"35 3","pages":"193-206"},"PeriodicalIF":1.9,"publicationDate":"2022-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ls.1632","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44436223","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Tribological performance study of oil-soluble ILs as lubricant additives by the four-ball method 四球法研究油溶性离子液体作为润滑添加剂的摩擦学性能
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2022-11-06 DOI: 10.1002/ls.1631
Zhaozhao Yang, Yijing Liang, Qing Huang, Xingwei Wang, Chunyu Zhou, Ruozheng Wang, Xiaoyan Yan, Bo Yu, Qiangliang Yu, Meirong Cai, Feng Zhou
{"title":"Tribological performance study of oil-soluble ILs as lubricant additives by the four-ball method","authors":"Zhaozhao Yang,&nbsp;Yijing Liang,&nbsp;Qing Huang,&nbsp;Xingwei Wang,&nbsp;Chunyu Zhou,&nbsp;Ruozheng Wang,&nbsp;Xiaoyan Yan,&nbsp;Bo Yu,&nbsp;Qiangliang Yu,&nbsp;Meirong Cai,&nbsp;Feng Zhou","doi":"10.1002/ls.1631","DOIUrl":"10.1002/ls.1631","url":null,"abstract":"Four oil‐soluble ionic liquids (ILs) with different structures were synthesised: N88816‐Doss (N/S), P88816‐Doss (P/S), N88816 phosphate (N/P) and P88816 phosphate (P/P). The effects of the four ILs synthesised with conventional lubricating additives isobutylene sulfide (T321), zinc dialkyl dithiophosphate (ZDDP) and tricresyl phosphate (T306) as PAO10 additives on the physicochemical properties of the prepared oil samples were systematically investigated at the same dosing rates. The antifriction and antiwear properties and extreme pressure performance of oil samples prepared by four ILs and three conventional additives were investigated by a four‐ball friction and a wear testing machine. The results showed that P/S improved the thermal stability of PAO10. The addition of N/S significantly improved the tribological performance of PAO10 at room temperature and under heavy loading. The coefficient of friction was reduced by 90%, the wear spot diameter is decreased by 28%, the last non‐seizure load PB is doubled, and the resistance to sintering did not improve.","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"35 3","pages":"183-192"},"PeriodicalIF":1.9,"publicationDate":"2022-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48576477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Kinetics study of cold rolling lubricant degradation through advanced instrumental techniques 利用先进的仪器技术研究冷轧润滑油降解动力学
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2022-10-21 DOI: 10.1002/ls.1630
Subho Chakraborty, Suvendu Sekhar Giri, Ashwin Pandit, Amarnath Bhagat, Ajay Kumar Jha
{"title":"Kinetics study of cold rolling lubricant degradation through advanced instrumental techniques","authors":"Subho Chakraborty,&nbsp;Suvendu Sekhar Giri,&nbsp;Ashwin Pandit,&nbsp;Amarnath Bhagat,&nbsp;Ajay Kumar Jha","doi":"10.1002/ls.1630","DOIUrl":"10.1002/ls.1630","url":null,"abstract":"<p>Research was focused on understanding the degradation kinetics of cold rolling oil used in the rolling mill at Tata Steel. Aged rolling oil leads to various surface defects. Ageing phenomenon is influenced through thermo-mechanical behaviour, oxidation, hydrolysis and presence of iron fines. Ageing of cold rolling oil in presence of iron fines was systematically performed at various temperature followed by thermo-mechanical wear tests. With variation in intensity of ageing, change in physico-chemical parameters and fatty acid distribution (FAD) within triglycerides could be observed. The impact of the controlled ageing on performance parameters like lubrication, evaporation kinetics and oxidative stability were also studied. Thermo-oxidative ageing depletes antioxidant concentration within the rolling oil resulting in rapid oxidation of unsaturated fats. This leads to rapid build-up of high molecular weight ingredients resulting in formation of fatty acid soaps or scum. The resultant scum negatively impacts the boundary lubrication and evaporation kinetics of rolling oil.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"35 3","pages":"171-182"},"PeriodicalIF":1.9,"publicationDate":"2022-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46445845","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Flow and slip process of Santotrac 50-based lubricant under high shear by molecular dynamic simulation 分子动力学模拟Santotrac 50基润滑剂在高剪切下的流动和滑移过程
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2022-10-21 DOI: 10.1002/ls.1629
Xin Zhao, Chao Wei, Zhenxin Yin, Wenjie Ma
{"title":"Flow and slip process of Santotrac 50-based lubricant under high shear by molecular dynamic simulation","authors":"Xin Zhao,&nbsp;Chao Wei,&nbsp;Zhenxin Yin,&nbsp;Wenjie Ma","doi":"10.1002/ls.1629","DOIUrl":"10.1002/ls.1629","url":null,"abstract":"<p>We investigate flow and slip behaviour of Santotrac 50 molecules under high shear in Couette cell by means of Molecular Dynamic simulation to understand reduced friction force. Molecular chain stretches and oriented to shear direction, and move. Slip starts on metal surface at 2 × 10<sup>8</sup> s<sup>−1</sup>, and increases with shear rate. Slip length keeps scale at nanometre. Molecular conformation and occurrence of slip both indicate a reduced shear stress. Furthermore, when changing wettability, slip length increases in power law and thus decreases shear stress greatly. Occurrence of low-density region near surface can explain slip. And thus, we extended apparent slip model, which divided lubricant into liquid layers with different viscosities, to elucidate the relationship between molecule distribution inner layer and slip on surface influenced by shear velocity and wettability. Above all, our research sheds light on flow and slip behaviour of complex fluid and can be applied in improving lubrication property.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"35 3","pages":"163-170"},"PeriodicalIF":1.9,"publicationDate":"2022-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49291319","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of thermal oxidation on structural and tribological properties of MoS2 films 热氧化对MoS2薄膜结构和摩擦学性能的影响
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2022-10-14 DOI: 10.1002/ls.1628
Hikmet Çiçek, Özkan Gözübüyük, İhsan Efeoğlu
{"title":"Effect of thermal oxidation on structural and tribological properties of MoS2 films","authors":"Hikmet Çiçek,&nbsp;Özkan Gözübüyük,&nbsp;İhsan Efeoğlu","doi":"10.1002/ls.1628","DOIUrl":"10.1002/ls.1628","url":null,"abstract":"<p>The aim of this study is to investigate the structural, mechanical and tribological behaviours of thermally oxidized MoS<sub>2</sub> films. MoS<sub>2</sub> coatings were deposited on D2 tool steel substrates using the closed field unbalanced magnetron sputtering method (CFUBMS). The thermal oxidation process was carried out at four different temperatures. Tribological properties were determined by pin-on-disc wear tests in the atmospheric environment. It was determined that thermal oxidation temperatures affected the chemical composition of MoS<sub>2</sub> films, but did not cause any change in film thickness. The wear rates of the samples differed depending on the oxidation temperature and the applied load. The lowest wear rate was determined as 1.97 × 10<sup>−8</sup> mm<sup>3</sup>/Nm in the oxidized film at 350°C. In addition, the highest hardness value was obtained as 655 HV in the film oxidized at 400°C, and the lowest coefficient of friction was obtained as 0.01 in the film oxidized at 350°C.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"35 2","pages":"144-154"},"PeriodicalIF":1.9,"publicationDate":"2022-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43928433","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Experimental investigation of the effect of tribological performance of reduced graphene oxide additive added into engine oil on gasoline engine wear 机油中添加还原氧化石墨烯添加剂对汽油机磨损影响的实验研究
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2022-10-11 DOI: 10.1002/ls.1627
Emrullah Hakan Kaleli, Selman Demirtaş
{"title":"Experimental investigation of the effect of tribological performance of reduced graphene oxide additive added into engine oil on gasoline engine wear","authors":"Emrullah Hakan Kaleli,&nbsp;Selman Demirtaş","doi":"10.1002/ls.1627","DOIUrl":"10.1002/ls.1627","url":null,"abstract":"<p>Good dispersion stability of engine oil added with graphene is the premise of playing its superior tribology property and also the novelty of this study. As the tribological behaviour of a commercialised, fully synthetic 5W40 engine oil upon the incorporation of reduced graphene oxide in sample (0.02 wt%) like (5W40 engine oil + 0.02 wt% Reduced Graphene Oxide) called rGO6 presented superior tribological properties by exhibiting the lowest COF value in our previous work, the same sample was evaluated through a reciprocating tribometer, using steel ball (100 CR6) on a real polished gasoline engine cylinder liner with 5W-40 engine oil to investigate their wear and friction behaviour in boundary lubrication regime. It was found that a rGO6 nano-additive played an active role in lowering the coefficient of friction (3.29%) and increased surface protection by forming a protective layer on a smooth nanorough on rubbing surfaces.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"35 2","pages":"118-143"},"PeriodicalIF":1.9,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42665216","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Titrimetric-comparable BN results determined for in-service lubricants using quantitative FTIR spectroscopy 使用定量傅里叶红外光谱测定在役润滑油的滴定可比BN结果
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2022-10-11 DOI: 10.1002/ls.1624
Frederik van de Voort, Daniel Furness, Michael Viset
{"title":"Titrimetric-comparable BN results determined for in-service lubricants using quantitative FTIR spectroscopy","authors":"Frederik van de Voort,&nbsp;Daniel Furness,&nbsp;Michael Viset","doi":"10.1002/ls.1624","DOIUrl":"10.1002/ls.1624","url":null,"abstract":"<p>A new stoichiometric FTIR Base Number (BN) method of significant utility and analytical benefit to the tribology sector has been developed, providing ASTM D4739-comparable BN results in lieu of titration in a fraction of the time. Thirty-six new/in-service oils analysed by both methods were linearly related with a between-method accuracy of ~±1.0 BN and a within-FTIR method reproducibility of ~±0.50 BN. Acid pK<sub>a</sub> differences and the comparative similarity of the FTIR results to HCl titration are discussed, including analytical benefits. It provides a rapid means of producing quality ASTM-comparable results, taking ~1 min/sample for spectral analysis versus 30–40 min for potentiometric titration. Method protocols are best suited to an open architecture FTIR accessory but can be readily adapted to flow cell equipped FTIRs. As structured, ASTM-like results are obtained rapidly with a major analytical environmental/maintenance footprint reduction, being ideally suited for in-service lubricant or research labs analysing 20–50 samples/day.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"35 2","pages":"93-102"},"PeriodicalIF":1.9,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45404271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Gas phase lubrication study with an organic friction modifier 有机摩擦改进剂的气相润滑研究
IF 1.9 4区 工程技术
Lubrication Science Pub Date : 2022-10-10 DOI: 10.1002/ls.1620
Jennifer Eickworth, Jonas Wagner, Philipp Daum, Martin Dienwiebel, Thomas Rühle
{"title":"Gas phase lubrication study with an organic friction modifier","authors":"Jennifer Eickworth,&nbsp;Jonas Wagner,&nbsp;Philipp Daum,&nbsp;Martin Dienwiebel,&nbsp;Thomas Rühle","doi":"10.1002/ls.1620","DOIUrl":"10.1002/ls.1620","url":null,"abstract":"<p>Friction modifier additives play a crucial role in controlling friction and wear of lubricated tribological systems. Model experiments in a controllable atmosphere performed by integrating a tribometer into a system of in situ surface analytical methods in vacuum can give insights into the additives functionality. In this work, thin, well-defined layers of an organic friction modifier (OFM) are adsorbed onto an iron oxide surface by means of an effusion cell immediately before measuring friction and wear. The results show that contrary to the assumption that homogeneous layers are formed, this OFM accumulates in droplets on the surface. Droplet number and radius increase with evaporation time. In friction tests, the smallest friction values are found for a low coverage of droplets. For larger droplets, friction increases due to a capillary neck of additive that forms between the sliding surfaces and is dragged along during the friction test.</p>","PeriodicalId":18114,"journal":{"name":"Lubrication Science","volume":"35 1","pages":"40-55"},"PeriodicalIF":1.9,"publicationDate":"2022-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/ls.1620","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44384832","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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