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Qingwen Dai

Bio: Qingwen Dai is an academic researcher from Nanjing University of Aeronautics and Astronautics. The author has contributed to research in topics: Lubrication & Temperature gradient. The author has an hindex of 12, co-authored 53 publications receiving 328 citations. Previous affiliations of Qingwen Dai include Technische Universität Darmstadt.

Papers published on a yearly basis

Papers
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Journal ArticleDOI
21 Jul 2016-Langmuir
TL;DR: A theoretical model and experimental investigation on the migration behavior of paraffin oil droplets induced by the unidirectional thermal gradient are developed and an effective approach for estimating the thermocapillary migration velocity of droplets on lubrication is proposed.
Abstract: A liquid droplet placed on a nonuniformly heated solid surface will migrate from a high-temperature region to a low-temperature region. This study reports the development of a theoretical model and experimental investigation on the migration behavior of paraffin oil droplets induced by the unidirectional thermal gradient. Thin-film lubrication theory is employed to determine the migration velocity of droplets, and temperature dependence of viscosity is taken into account. Comparisons between experimental and numerical results are presented. An effective approach for estimating the thermocapillary migration velocity of droplets on lubrication is proposed.

43 citations

Journal ArticleDOI
TL;DR: In this article, a comparative review of the fundamentals of interfacial motion of liquids, evaluation methodologies, and manipulation strategies in design is presented for modern tribo-systems exposed to thermal gradients and establish general guidelines for the design of miniature rolling bearings, microfluidics, and condensation and heat transfer devices.

36 citations

Journal ArticleDOI
TL;DR: In this article, the influence of surface roughness and surface topography orientation on paraffin oil migration behavior under various temperature gradients was investigated. And the results showed that the roughest surface with the grinding scars parallel to the temperature gradient exhibited the fastest migration velocity.

31 citations

Journal ArticleDOI
TL;DR: In this article, an attempt has been made to use magnetic fluids as lubricant to improve the operation performance of thrust ball bearing under starved lubrication conditions, and preliminary experiments indicate that, magnetic fluids under proper magnetic field can be used to reduce lubricant loss, and thus delay the starvation.

25 citations

Journal ArticleDOI
09 Sep 2015-Langmuir
TL;DR: The results demonstrated that microdimples have a significant obstructive effect on migration, whereas dimples has a retaining effect, and the adjacent dimples have an interacting effect.
Abstract: Thermo-capillary migration is a phenomenon in which surface thermal gradients drive a liquid to flow from warm to cold regions without external forces. It is important to prevent the migration of liquid lubricants on rubbing surfaces. In this paper, a pattern of microdimples was proposed to obstruct the liquid migration induced by an omnidirectional thermal gradient. Microdimple patterns were fabricated on the surfaces of SUS316 stainless steel. Experiments were performed to investigate the influence of microdimple patterns with different geometric parameters on the migration behavior of paraffin oil. In particular, this study focused on the interfacial flowing near the microdimples. The results demonstrated that microdimples have a significant obstructive effect on migration, whereas dimples have a retaining effect, and the adjacent dimples have an interacting effect.

22 citations


Cited by
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Journal ArticleDOI
14 Oct 2020-Friction
TL;DR: This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years and presents future outlook pertaining to these aspects.
Abstract: The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

271 citations

Journal ArticleDOI
TL;DR: In this paper , the cooling lubrication mechanism and technical iteration motivation of minimum quantity lubrication (MQL) were initially analyzed, and a quantized comparative assessment of cutting force, cutting temperature, tool wear, and surface quality under enhanced environmentally friendly lubrication turning, including parts enhanced by nanoparticles, cryogenic medium, ultrasonic vibration, and textured tools, was performed.

143 citations

01 Jan 2015
TL;DR: In this paper, the authors compared the friction properties of a hexagonal array of polydimethylsiloxane (PDMS) pillars (elongated and regular) in the presence of water.
Abstract: Anatomic differences on the toe pad epithelial cells of torrent and tree frogs (elongated versus regular geometry) are believed to account for superior ability of torrent frogs to attach to surfaces in the presence of running water. Here, the friction properties of artificial hexagonal arrays of polydimethylsiloxane (PDMS) pillars (elongated and regular) in the presence of water are compared. Elongated pillar patterns show significantly higher friction in a direction perpendicular to the long axis. A low bending stiffness of the pillars and a high edge density of the pattern in the sliding direction are the key design criteria for the enhanced friction. The elongated patterns also favor orientation-dependent friction. These findings have important implications for the development of new reversible adhesives for wet conditions.

95 citations