The #ow structures generated by a pressure-controlled self-oscillating valve are investigated both experimentally and numerically. Schlieren #ow visualization experiments show that a stable vortex is developed downstream of the valve during the closing phase of the valve. During the opening phase of the valve, this vortex moves downstream and dissipates. An experimental study of the vortex inte...

This paper presents a novel latchable phase-change microvalve that can potentially be used for flow gating in portable lab-on-a-chip systems here minimal energy consumption is desired. The microvalve innovatively exploits paraffin wax of low melting point, whose solid–liquid phase hanges allow the closing and opening of fluid flow through deformable microchannel ceiling. The latchable phase-cha...

Air bubbles mixed in the hydraulic oil of power transmission systems causes deterioration dynamic characteristics system, component erosion, accelerated oil, reduced heat dissipation, and vibration noise. In this paper, a method to controlling air bubble content by swirling flow working has been proposed developed. The amount flowing out separation device can be adjusted opening closing valve o...

o a i “ l f o t i o Functional mitral regurgitation typically occurs in patients with ischemic cardiomyopathy or idiopathic dilated cardiomyopathy and is independently associated with excessive morbidity and mortality (1–8). In functional mitral regurgitation, it has been demonstrated that abnormal mitral valve kinematics result from a restriction of leaflet closure as a result of enhanced apic...

Analysis and experiment show that to supercharge the suction volume of a cylinder by means of pressure pulsation is not certain to result in delay of the valve closing. To arrange a proper suction pipeline and valve cavity, we can not only get supercharge of the cylinder, but also,get economical specific power consumption, while valve working condition is good too. In this paper the methods of ...

The use of echocardiography, phonocardiography, and spectroanalysis has enhanced the ability to detect prosthetic valve dysfunction even before the onset of symptoms in many patients. Reduction in the intensity of the opening and closing clicks and the appearance of new murmurs have been the most frequently reported observations in predicting prosthetic valve dysfunction. Simultaneous echocardi...

Abstract Late intake valve closing (LIVC) Miller cycle was used on a highly-intensified single cylinder diesel engine to reduce the maximum combustion pressure and temperature. Three cams with three LIVC timings were designed tested bench. The gas exchange process of investigated by 1-D simulation model which calibrated experimental data. analysis conducted at constant speed 3600 r/min two IMEP...

Technical difficulties in recording phonocardiogram or indirect carotid pulse occasionally preclude determination of the systolic time intervals. Accordingly, an alternative method was tested in 52 patients, using high-speed strip chart recording of the aortic valve echocardiogram. Satisfactory records were obtained in 36. The interval from opening to closing of the aortic valve (ejection time)...

1021–41. [8] Devereux RB, Alonso DR, Lutas EM, Gottlieb GJ, Campo E, Sachs I et al. Echocardiographic assessment of left ventricular hypertrophy: comparison to necropsy findings. Am J Cardiol 1986;57:450–8. [9] Leyh RG, Schmidtke C, Sievers HH, Yacoub MH. Opening and closing characteristics of the aortic valve after different types of valve-preserving surgery. Circulation 1999;100:2153–60. [10]...

St. Jude Medical (SJM) bileaflet mechanical valves were approved by the Food and Drug Administration in 1977. The SJM valve design consists of two semicircular leaflets which pivot on hinges. Compared to other mechanical heart valve prostheses such as ball and cage and tilting disk prosthetic valves, it provides good central flow, the leaflets open completely, and the pressure drop across the v...