The role of coherent vortices near the turbulent/non-turbulent (T/NT) interface in a turbulent plane jet is analysed by a direct numerical simulation (DNS). The coherent vortices near the jet edge consist of large-scale vortical structures (LSVSs) maintained by the mean shear and intense vorticity structures (IVSs) created by the background fluctuating turbulence field. The radius of the LSVS i...

Abstract In this work, the use of projection micro-stereolithography (P?SL) to 3D print a micro-optofluidic device for slug flow detection is presented. For comparison purposes, poly-dimethylsiloxane (PDMS)–based was also manufactured by novel master–slave printing approach. The has microfluidic T-junction with micro-optical section that consists two optical fiber insertions used detection. des...

Physical effects induced in micro-convective gaseous slip-flow due to variation fluid properties are numerically examined this paper. The problem is particularly simulated for through a micro-channel heat sink (MCHS) having constant flux supplied from the wall under hydrodynamically and thermally fully developed flow (FDF) conditions. It observed that Nusselt number (Nu) significantly higher th...

in the present paper, the deformation zone of the ecae (equal channel angular extrusion) process was investigated using the upper bound theorem. for this purpose, the shape of the streamlines in the deformation zone was assumed to be cubic bezier curves. then, the force required for the ecae process was optimized with regard to the parameters defining the shape of streamlines by the upper bound...

Turbulent flow of water in a short 0.4mm high micro-channel of an emulsifier is investigated experimentally using a micro-PIV technique and compared with numerical predictions. The micro-flow measurements are based on epi-fluorescence illumination and high-speed imaging. Velocity fields obtained from the measurements and direct numerical simulations indicate that flow turbulization is delayed a...

The spitting cobra Naja pallida can eject its venom towards an offender from a distance of up to two meters. The aim of this study was to understand the mechanisms responsible for the relatively large distance covered by the venom jet although the venom channel is only of micro-scale. Therefore, we analysed factors that influence secondary flow and pressure drop in the venom channel, which incl...

Introduction. The Collaborative Research Centre 747 “Micro cold forming” studies aspects of the production of micro components. Motivated by the engineering application of melting the end of thin wires by laser heating in order to accumulate material for a subsequent forming process, we study the melting and solidification of material with a free capillary melt surface. The model leads to a cou...

Water-in-oil droplets have huge importance in chemical and biotechnology applications, despite their difficulty being produced microfluidics. Moreover, existing studies focus more on the different shape of microchannels instead size, which is one critical factors that can influence flow characteristics droplets. Therefore, present work aims to study behaviours water-in-oil at interfacial surfac...

Study of methods resolved top quarks kinematic reconstruction in the $t\bar{t} \rightarrow \ell+$jets channel is presented at particle level as well fast-simulation detector level. Previous and current pseudo-top quark algorithms are compared with suggestions on how to improve reconstructed top-quark mass line shape, including check performance physics observables terms correlations between det...