Based on Fluent software, a mathematical model of thermosyphon pump is established and numerical simulation carried out to study the influence riser tube length, diameter immersion ratio liquid lifting capacity efficiency. The results showed that: volume increased with increase ratio, whereas efficiency trend increasing followed by decreasing. highest for 340mm long, 6mm achieved when 0.35. Wit...

E. Strambini, a) F. S. Bergeret, 3, 4, b) and F. Giazotto c) NEST Istituto Nanoscienze-CNR and Scuola Normale Superiore, I-56127 Pisa, Italy Centro de F́ısica de Materiales (CFM-MPC), Centro Mixto CSIC-UPV/EHU, Manuel de Lardizabal 4, E-20018 San Sebastián, Spain Donostia International Physics Center (DIPC), Manuel de Lardizabal 5, E-20018 San Sebastián, Spain Institut für Physik, Carl von Ossie...

This volume originates from the Seventh International Conference on “Stochastic Models of Manufacturing and Service Operations”, which took place in Ostuni, Italy, in 7–12 June, 2009. The aim of this conference was to serve as a forum for researchers, academics and industrialists to discuss their most recent research findings and to provide them with opportunities for technology transfer. The c...

Transmission and distribution pipelines have a significant role in the oil and gas industries. Pipelines are facing different threat like corrosion, improper design and incorrect operation. Gas vapor released from a pipeline (owned by NIOC) failure spread out and reached to ignition source. Due to gas outdoor spreading, “flash fire” occurred and flame return caused “vapor cloud explosion” of ga...

Abstract Free-standing hybrid risers are vertical slender steel pipes that commonly used in the oil and gas industry. These structures subjected to complex hydrodynamic loads results fatigue damage. The tidal forces develop on Freestanding Risers (FSR) with buoyancy cans ( BC ) because of varying outer pipe dimensions investigated this work. study considered riser diameters 0.2, 0.3, 0.5 0.6 me...

Kinetic theory based particle velocity measurements in a symmetric two-story riser show that in the core the flow is laminar and that the granular temperature is approximately given by the analogue of thermal temperature rise in Poiseuille flow. However, like in the turbulent flow in a pipe, the normal kinetic stresses are anisotropic. The shear and the normal stresses are an order of magnitude...

Vortex-induced vibration (VIV) of a long riser in sheared current is often considered as an energy balance problem: Excitation forces in the power-in region add an equal amount of energy to the system as is dissipated by damping forces outside this region and structural damping. A riser may have different excitation and damping regions depending on the actual oscillation frequency, cross-sectio...

In order to reduce the shrinkage porosity of nickel-based superalloy castings in investment casting process, effects different gating systems on mold filling, solidification and prediction aero-engine turbine nozzle were investigated by simulation experimental methods. Results show that design vertical runner would cause greater turbulence melt riser during filling outer is not necessary. With ...