In the present study, numerical study of Al2O3-water nanofluid flow in different coiled wire inserted tubes are performed to investigate the effects of inserting coiled wires in tubes on the fluid dynamic and heat transfer performance ofv nanofluids. The numerical simulations of nanofluids are performed using two phase mixture model. The flow regime and the wall boundary conditions are assumed ...

There are two main systems that can be used to coil and uncoil the wires of a wire-driven parallel robots: a rotary motor that turns a drum on which the wire is coiled or a linear motor with a pulley system. The rotary category may be divided into two sub-categories: the system with a spiral guide for the coiling, allowing only layer for the wire and the system without guide, that allows for se...

INTRODUCTION We conducted a biomechanical study comparing cerclage wiring using a power tool with the traditional manual method. MATERIALS AND METHODS Our study consisted of 4 experimental arms based on the method of fixation and diameter of wires. The 4 arms were: 1) power tool method using 0.8 mm cerclage wires, 2) power tool method using 1.0 mm cerclage wires, 3) conventional manual method...

We study the macroscopic electrical conductivity of a composite made of straight or coiled nanowires suspended in a poorly conducting medium. We assume that the volume fraction of the wires is so large that spaces occupied by them overlap, but there is still enough room to distribute the wires isotropically. We found a wealth of scaling regimes at different ratios of conductivities of the wire,...

A N−1 wire-driven parallel robot is a robot for which all the N ≥ 3 wires are connected at the same point of the platform, allowing to control the location of this point. We are interested in the positioning accuracy of such a robot. If the wires are not elastic we show that the influence on the accuracy of the co-location errors of the wire anchor points on the platform is moderate, although a...

Application of nanofluid and coiled tubes are two passive methods for increasing the heat transfer. In the present study, the turbulent flows of water and nanofluid in coiled tubes heat exchanger were numerically studied. CuO-water nanofluid containing 1 vol% copper oxide nanoparticles was used and single-phase approach was considered for nanofluid flow. The effect of different geometrical para...

the key to successful long-term peritoneal dialysis (pd) is permanent and safe access to peritoneal cavity. the two most commonly used tenckoff catheters for pd are the straight and coiled catheters. the present study was undertaken to assess the catheter survival, catheter associated infections, and all cause mortality and to compare the straight with coiled catheters in pd. during april 1997-...

background: one of the methods used for joining metals together is welding, which can be carried out using different techniques such as electric spot welding. this study evaluated the effect of electric spot welding on the load defl ection rate of stainless steel and chromium-cobalt orthodontic wires. materials and methods: in this experimental-laboratory study, load defl ection rate of 0.016 ×...