نتایج جستجو برای: annular flow control valves
تعداد نتایج: 1766536 فیلتر نتایج به سال:
The annular foam breaker is one which uses the vacuum and shear force generated by the Coanda effect to break foam. The pressure distribution directly affects its performance. So an investigation on the flow characteristics inside the annular foam breaker is important to optimize its structure. In this paper, the computational fluid dynamics (CFD) code, FLUENT, is employed to simulate the flow ...
Stentless valve continence is affected by the implantation technique, annular symmetry and dilatation of the sinotubular junction. We tested in vitro how the Sorin Solo stentless pericardial valve adapts to a slightly dilated sinotubular junction. Stentless Sorin Solo aortic valves (25 mm) were sutured into a 32-mm Valsalva graft suspending the commissures into the expandable region of the graf...
In pipeline-riser systems, pressure fluctuations which result from the formation of large liquid slugs and gas surges due to operational changes or low mass flow rate from production wells and the profile of pipeline-riser systems often lead to trips at the inlet of the separator; and thereby, the problem causes a a loss of the production.In this study, on a sample deep-water oil field off the ...
We have characterized the annular geometry of mitral and tricuspid valves in elite athletes using 3-D echocardiography. found that exercise-induced remodeling atrioventricular annuli comprises a disproportionate dilation dimensions increased leaflet tenting both valves. Moreover, we demonstrated more pronounced saddle shape annulus without regurgitation, which was not present those who had mild...
OBJECTIVES After a panel process, recommendations on the use of sutureless and rapid deployment valves in aortic valve replacement were given with special respect as an alternative to stented valves. METHODS Thirty-one international experts in both sutureless, rapid deployment valves and stented bioprostheses constituted the panel. After a thorough literature review, evidence-based recommenda...
the flow of fluids in annular conduits has been studied for over sixty years, however the resulted data are very scattered. in this paper the problem is analytically solved, starting out with navier-stokes equations. a computer solution is used to determine the shape of velocity profiles, the discharge and the friction factor in a large number of concentric and eccentric annular conduits. the e...
OBJECTIVE The approval of a heart valve for the European market takes place in accordance with European and international standards. A new version of the EN Standards was published in June 2006, which responded to different technical innovations in the area of heart valve technology. This work outlines the differences between the new EN ISO 5840 (2005) and the old EN 12006-1 (1999). METHODS W...
a newly developed heavy duty diesel engine in dual fuel mode of operation has been studied in detail. the main fuel would be natural gas and diesel oil as pilot injection. the importance and effects of mixture preparation and formation through ports, valves and in cylinder flow field with different swirl ratio and tumble on diesel combustion phenomena is an accepted feature which has been studi...
T he first successful heart valve replacements were carried out in 1960 with the use of mechanical prostheses.1-3 Because of the risk of throm-boembolism that is inherent to all mechanical prosthe-ses and the hazards of continuous anticoagulation, fewer thrombogenic tissue valves were developed.4,5 In the early 1960s, homograft replacement of the aortic valve was reported,6'7 and shortly therea...
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