Ramin Rahmani

Bio: Ramin Rahmani is an academic researcher from Loughborough University. The author has contributed to research in topics: Lubrication & Lubricant. The author has an hindex of 22, co-authored 109 publications receiving 1606 citations. Previous affiliations of Ramin Rahmani include Anglia Ruskin University.

Transient elastohydrodynamic lubrication of rough new or worn piston compression ring conjunction with an out-of-round cylinder bore:

Abstract: Real cylinder bores are out-of-round and axially asymmetrical. The top compression ring, nominally an incomplete circle, is subjected to ring tension and cyclic combustion force in order to conform...

Optimization of Partially Textured Parallel Thrust Bearings with Square-Shaped Micro-Dimples

Abstract: In this study we attempt to find the optimum geometrical parameters of square-shaped micro-dimples imposed on parallel flat bearing surfaces, which give the best tribological performance, including the load capacity and the friction coefficient. An analytical solution of the Reynolds equation for the surfaces involving numerous dimples is presented, then considering the variations of the number of dimples as well as the dimple length, and the height ratios for a constant dimpled length, it is used to get the optimum value of the parameters. It is shown that despite the variations of different studied geometrical parameters, it seems the optimum value of these parameters remains nearly constant.

Electrospinning and Electrospun Nanofibers: Methods, Materials, and Applications

Abstract: Electrospinning is a versatile and viable technique for generating ultrathin fibers. Remarkable progress has been made with regard to the development of electrospinning methods and engineering of electrospun nanofibers to suit or enable various applications. We aim to provide a comprehensive overview of electrospinning, including the principle, methods, materials, and applications. We begin with a brief introduction to the early history of electrospinning, followed by discussion of its principle and typical apparatus. We then discuss its renaissance over the past two decades as a powerful technology for the production of nanofibers with diversified compositions, structures, and properties. Afterward, we discuss the applications of electrospun nanofibers, including their use as "smart" mats, filtration membranes, catalytic supports, energy harvesting/conversion/storage components, and photonic and electronic devices, as well as biomedical scaffolds. We highlight the most relevant and recent advances related to the applications of electrospun nanofibers by focusing on the most representative examples. We also offer perspectives on the challenges, opportunities, and new directions for future development. At the end, we discuss approaches to the scale-up production of electrospun nanofibers and briefly discuss various types of commercial products based on electrospun nanofibers that have found widespread use in our everyday life.