نتایج جستجو برای: jet flow vena contracta effect
تعداد نتایج: 2096745 فیلتر نتایج به سال:
OBJECTIVE To assess flow dynamics after total cavopulmonary connection (TCPC). DESIGN Cross-sectional study. SETTING Aarhus University Hospital. PATIENTS Seven patients (mean age 9 (4-18) years) who had previously undergone a lateral tunnel TCPC mean 2 (0. 3-5) years earlier. INTERVENTIONS Pressure recordings (cardiac catheterisation), flow volume, and temporal changes of flow in the la...
Several investigations have been devoted towards understanding the coating process in fluidized beds. Most of these studies focused on spraying liquid droplets over the bed. However, due to the complexity of these systems, more investigations are still required to quantify the effect of operating conditions on the coating criteria. The present work aims at fundamentally understanding and pr...
Junctional ectopic tachycardia (JET) often occurs in the setting of surgery for congenital heart disease [1]. A congenital variety of JET not related to any surgery has also been described [2]. While post surgical JET has a mortality upto 14% [1], congenital JET has a mortality upto 34% [3]. A case of JET associated with myocarditis, has also been reported [4]. Electrocardiographic diagnosis of...
This paper describes a computational study undertaken to determine the aerodynamic effect of tiny unsteady synthetic jets as a means to provide the control authority needed to maneuver a spinning projectile at low subsonic speeds. Advanced Navier-Stokes computational techniques have been developed and used to obtain numerical solutions for the unsteady jet-interaction flow field at subsonic spe...
To understand / evaluate behaviour of these complex jets freestream interactions, experiments were carried out in the freestream Mach number range of 0.6 to 1.8 varying jet pressure ratios in the range of 1 to about 15 on a twin jet afterbody configuration. Test results show that afterbody total drag in general increased (for the Mach number range of this investigation) with the increase in jet...
The Performance of shooting pool, in addition to the quality of the area in which the flow collides with it, depends to the height of the jet drop, the angle of the water flow, the depth of the jet and the concentration of the jet. By increasing the height of the jet drop, the fall velocity increases and subsequently the jetchr('39')s energy will be more intrusive. Different collision area from...
Recent studies of impinging jet flows have shown that momentum exchange and heat transfer can be significantly improved if the jet flow is pulsed (Zumbrunnen, 1996). Moreover, when the jet holes are elliptical, jet free surfaces are formed into a helical structure. Upon pulsating the jet flow, the helical structure rotates and a strong twisting action can be imparted where the jet strikes a sur...
BACKGROUND Functional mitral regurgitation (MR) due to dilated cardiomyopathy or coronary artery disease remains a significant clinical problem. These clinical entities lead to left ventricular enlargement, which results in annular dilation and MR. Surgical valvuloplasty is associated with a high perioperative risk. This is the reason why percutaneous techniques for mitral valve repair are unde...
The aim of this paper is numerical and experimental study of the effects of flow hydraulics, pipe structure (particularly elastic behaviour) and submerged jet on leak behaviour. In this regard, experimental tests were performed on a high-pressure circulation set up. Experiments were performed on an old steel pipe and a High Density Polyethylene (HDPE) pipe discharged to the atmosphere in a wide...
CONTEXT Quantification of the magnitudes of fluid resistance provided by water jets (currents) and their effect on energy expenditure during aquatic-treadmill walking is lacking in the scientific literature. OBJECTIVE To quantify the effect of water-jet intensity on jet velocity, drag force, and oxygen uptake (VO2) during aquatic-treadmill walking. DESIGN Descriptive and repeated measures. ...
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