This thesis is motivated by the necessity to understand the flow structure of turbulent flows in bends encountered in many technical applications such as heat exchangers, nuclear reactors and internal combustion engines. Flows in bends are characterised by strong secondary motions in terms of counter-rotating vortices (Dean cells) set up by a centrifugal instability. Specifically the thesis dea...

The study of creeping motion of viscoelastic fluid around a rotating rigid torus is investigated. The problem is solved within the frame of slow flow approximation. The equations of motion governing the first and second-order are formulated and solved for the first-order only in this paper. However, the solution of the second-order equations will be the subject of a part two of this series of p...

The phase shift between pressure and wall shear stress (WSS) has been associated with vascular diseases such as atherosclerosis aneurysms. present study aims to understand the effects of geometry flow properties on under stiff assumption, using an immersed-boundary-lattice-Boltzmann method. For pulsatile in a straight pipe, is known increase Womersley number, but independent speed (or Reynolds ...

It is presently believed that flows of viscoelastic polymer solutions in geometries such as a straight pipe or channel are linearly stable. Here we present experimental evidence that such flows can be nonlinearly unstable and can exhibit a subcritical bifurcation. Velocimetry measurements are performed in a long, straight microchannel; flow disturbances are introduced at the entrance of the cha...

CAN J ANESTH 54: 1 www.cja-jca.org January, 2007 8 Hernandez-Diaz S, Varas-Lorenzo C, Garcia Rodriguez LA. Non-steroidal antiinflammatory drugs and the risk of acute myocardial infarction. Basic Clin Pharmacol Toxicol 2006; 98: 266–74. 9 Kearney PM, Baigent C, Godwin J, Halls H, Emberson JR, Patrono C. Do selective cyclo-oxygenase-2 inhibitors and traditional non-steroidal anti-inflammatory dru...

In this study, a flexible ultrasonic transducer (FUT) was applied in a laser ultrasonic technique (LUT) for non-destructive characterization of metallic pipes at high temperatures of up to 176 °C. Compared with normal ultrasound transducers, a FUT is a piezoelectric film made of a PZT/PZT sol-gel composite which has advantages due to its high sensitivity, curved surface adaptability and high te...

The segregated flow pattern, which occurs in a 26.1 mm diameter, horizontal, stainless steel test section, is investigated. Pressure gradient and in situ phase distribution data were obtained for different combinations of phase superficial velocities ranging from 0.05 m·s 1 to 0.96 m·s . For the current small Eötvös number liquid-liquid system (EoD 4.77), the dominant effect of interfacial tens...

In Japan, as the number of sewerage management facilities increases, continuous maintenance drainage pipes and sewage is considered important. However, it grinding for operators to perform expansive in-pipe inspection. Therefore, in recent years, inspections using stand-alone type piping inspection robots have been actively used. Inside pipe, there are disturbances such unevenness, sludge, or d...

The electronic industries have been tried to develop the electronic packaging technology for high-density, light weight, and miniaturization of mobile personal information terminals such as notebook PC, personal digital assistant (PDA), or handheld PC as the performance and the portability of the system have been become important more and more. The generated heat from the CPU of the electronic ...