designing and manufacturing the multiple jets simulator and experimental investigation of the multiple jets in crossflow at low velocity ratios have been studied together with design and build a low-speed wind tunnel. a specific rake is used to determine the flow field pressure and changes in static pressure measured by pressure taps in the near field of the jets. there are generally three regi...

Since double-suction centrifugal pumps consume quantities of energy, revealing critical factors for energy dissipation is helpful energy-saving design. This study aims to investigate the relationship between and vortex based on Rortex method in a pump. Detached eddy simulation was applied obtain flow field. Enstrophy used present strength local rigid shear. The results indicate that shear domin...

general concept and major emphasis on off-pump coronary artery bypass surgery (opcab) is maintaining quality of care and patient safety while reducing cost and resource utilization. opcab probably avoids the potential complications of cardiopulmonary bypass. however its acceptance depends on clinical and economic outcome. the aim of this study is to compare clinical and economic outcome of off-...

Abstract: To study the influence of turning maneuvering navigation angle on inflow characteristics water jet propulsion pumps, numerical simulations were conducted mixed flow pumps under straight and left right 15 °/30 ° states. By comparing hydraulic performance differences five states, intrinsic relationship between pump morphology was elucidated, evolution mechanism conditions emphasized, co...

One of the world's major mineral dust source regions lies along the border between Iran and Afghanistan. In this studyit is hypothesized that a low-level jet may play in role in generating the intensity of this source region. The presence of alow-level jet east of the Seistan mountains is documented here for the first time. The jet exists mainly from May toSeptember and has a core at 850 mb. Ma...

Numerous investigations have been devoted towards understanding the hydrodynamics of gas jets in fluidized beds. However, most of them address the problem from  macroscopic point of view, which does not reveal the true behavior in the jet region at the single particle level. The present work aims to understand the jet behavior from a more fundamental level, i.e. the individual particle leve...

A numerical study has been carried out for slot air jet impingement cooling of horizontal concentric circular cylinders. The slot air jet is situated at the symmetry line of a horizontal cylinder along the gravity vector and impinges on the bottom of the outer cylinder which is designated as θ=0°. The outer cylinder is partially opened at the top with a width of W=30mm and is kept at constant t...

The influence mechanism of the blade tip clearance (TC) an inducer on performance a centrifugal pump at high speed was researched under different flow rate conditions in this work. An experiment pump’s external carried out, and numerical calculation also performed four TCs. full characteristic curves, static pressure pulsation distributions were obtained. Through research analysis, it found tha...