Searched for: subject%3A%22lubrication%22
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van Eijk, Casper (author)
This thesis presents the design and experimental evaluation of an in-line, active ultrasound, condition monitoring setup for the detection of contamination in offshore bearing grease. This process is divided into three distinct research steps. First of all, the influences that affect ultrasound propagation through a bearing grease sample have...
master thesis 2024
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Nieuwenhuis, Jelte (author)
master thesis 2023
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de Waart, Wessel (author)
In the pursuit of reducing the climate impact of aviation, there has been an increased interest in the adoption of renewable energy technologies. Examples of revolutionary technologies include hydrogen fuel cell systems and waste heat recovery using the organic Rankine cycle. The design of viable energy conversion systems for aviation poses...
master thesis 2023
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Dekker, Victor (author)
Due to financial and environmental benefits, the interest in high-temperature heat pumps, producing heat sinks above 100 °C, is rising. Research is intensifying, and technology is developing fast. However, of all the components of the heat pump cycle, the oil management system seems to be the least investigated, even though 12% of the faults in...
master thesis 2023
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Snieder, J. (author), Dielen, Marc (author), van Ostayen, R.A.J. (author)
This work presents the development of a numerical model for the elastohydrodynamic lubrication of roll-to-plate nanoimprinting with flexible stamps. Roll-to-plate nanoimprinting is a manufacturing method to replicate micro- and nanotextures on large-area substrates with ultraviolet-curable resins. The roller is equipped with a relatively soft...
journal article 2023
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Feng, H. (author), Gao, Zhiwei (author), van Ostayen, R.A.J. (author), Zhang, Xiaofeng (author)
This paper aims to investigate the combined effects of working condition and structural parameters of groove texture on the dynamic characteristics, stability and unbalance response of a water-lubricated hydrodynamic bearing–rotor system to avoid instability and excessive vibration of the rotor. The Navier–Stokes equation, standard K-ε model...
journal article 2023
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van der Meer, G.H.G. (author), Quinci, F. (author), Litwin, W. (author), Wodtke, M. (author), van Ostayen, R.A.J. (author)
A journal bearing test bench is used to find the transition speed between the hydrodynamic and mixed lubrication regimes for a modified magnetorheological (MR) fluid. It is shown that the transition speed of the bearing can be reduced by applying a local magnetic field near minimum film when it is lubricated with the MR fluid, and that this...
journal article 2023
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Nijssen, Tim M.J. (author), Ottens, M. (author), Padding, J.T. (author)
Lubrication forces play a major role in the behaviour of fluid–solid systems, where they affect the collisions between particles. Current implementations of lubrication forces in unresolved simulations often suffer from shortcomings, such as neglecting parts of the physics or relying on arbitrarily defined parameters. In this short...
journal article 2023
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Roël, Felix (author)
Our remarkable sense of touch provides us the feedback that is crucial for successfully manipulating a wide range of objects.<br/>The unconscious synergy between touch and the precision grip is particularly astonishing.<br/>During precision manipulation, humans constantly control their grip force to maintain a safety margin of approximately 25...
master thesis 2022
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Snieder, J. (author), Dielen, Marc (author), van Ostayen, R.A.J. (author)
Roll-to-plate nanoimprinting with flexible stamps is a fabrication method to pattern large-area substrates with micro- and nanotextures. The imprint consists of the preferred texture on top of a residual layer, of which the thickness and uniformity is critical for many applications. In this work, a numerical model is developed to predict the...
journal article 2022
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Danczul, Tobias (author), Hetebrij, Wouter (author), Khalighi, Faeze (author), Kogler, Lukas (author), Lahaye, D.J.P. (author), Luckins, Ellen (author), Munters, Wim (author), Neunteufel, Michael (author), Vuik, Cornelis (author)
conference paper 2022
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Srinivasan, Sudharsan (author), van den Akker, H.E.A. (author), Shardt, Orest (author)
The understanding of the rheological behaviour of suspensions in aqueous electrolytes is necessary for the optimal design of hydraulic transport lines. In these applications, particle size is at least 10 micron, and the particle Reynolds number, Re<sub>p</sub>, is finite: O(10<sup>−1</sup>). Although there are some experimental and numerical...
journal article 2022
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de Koning, Ramon (author)
In conventional compressor technology, high pressure ratios are often achieved by multiple, successive compression stages. This is done to avoid high temperatures due to the adiabatic nature of most compression processes which deteriorates the working of oil lubrication. The aim of this work is to reduce a conventional four-stage system to only...
master thesis 2021
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Nijssen, J.P.A. (author), Faludi, Jeremy (author), van Ostayen, R.A.J. (author)
Water lubricated bearings have been named in literature as a sustainable alternative to their oil-based counterparts. In order to clarify when water lubricated bearings are or are not a sustainable alternative, and inform design decisions, an analytical design tool is introduced based on anticipatory Life Cycle Assessment (LCA). This model is...
journal article 2021
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Wu, Dequan (author), Ma, Lingwei (author), Liu, Bei (author), Zhang, Dawei (author), Minhas, Badar (author), Qian, Hongchang (author), Terryn, H.A. (author), Mol, J.M.C. (author)
This study investigated the deterioration of a lubricant-infused anodic aluminium oxide surface in a 1 M NaCl solution for ∼200 days. Direct observation by cryo-SEM and quantitative analyses by UV spectroscopy and EIS revealed that the long-term deterioration of the lubricant-infused surface was divided into two stages: the surface-adhered...
journal article 2021
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Lampaert, S.G.E. (author)
The bearing and the seal are two commonly used tribological components since nearly all moving machinery relies on them for proper operation. Even a small improvement in these components can have a big impact on both the market and the environment. The two main problems of these components are wear and friction. In addition, seals suffer from...
doctoral thesis 2020
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Siers, Sebas (author)
A LED induced fluorescent technique based test setup is introduced , which is used to measure the water film thickness of compliant hydrostatic bearings. Fluorescent particles have the characteristic of absorbing light of a certain wavelength and emitting light of a higher wavelength. A LED with a wavelength of 540 nm (green light) is used to...
master thesis 2020
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Wu, Dequan (author), Zhang, D. (author), Ye, Yuwei (author), Ma, Lingwei (author), Minhas, Badar (author), Liu, Bei (author), Terryn, H.A. (author), Mol, J.M.C. (author), Li, Xiaogang (author)
Recently, lubricant-infused surfaces (LIS) have emerged as a prominent class of surface technology for antifouling, anti-icing and anticorrosion applications. However, long-term corrosion exposure and mechanical damages may deteriorate the practical performance of LIS during application. In this study, a robust LIS was fabricated by the...
journal article 2019
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Eling, R.P.T. (author)
In the competitive automotive market, the performance of turbochargers is constantly being pushed towards their theoretical optimum. One of the key components of the turbocharger is the rotor-bearing system, which determines the friction losses and noise output and furthermore affects the overall turbocharger efficiency, reliability and cost. In...
doctoral thesis 2018
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Langowski, Julian K.A. (author), Dodou, D. (author), Kamperman, Marleen (author), van Leeuwen, Johan L. (author)
Tree frogs have the remarkable ability to attach to smooth, rough, dry, and wet surfaces using their versatile toe pads. Tree frog attachment involves the secretion of mucus into the pad-substrate gap, requiring adaptations towards mucus drainage and pad lubrication. Here, we present an overview of tree frog attachment, with focus on (i) the...
review 2018
Searched for: subject%3A%22lubrication%22
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