We used contrast echocardiography to estimate changes in flow velocity at the tricuspid and pulmonic valve orifices, as reflected by varying angles of the moving linear contrast echoes. The validity of the method was established by catheterization and echocardiographic studies in 14 patients. Flow velocity at the tricuspid and pulmonic valve orifices was measured by means of an electromagnetic ...

BACKGROUND Aortic stenosis (AS) leads to variable stress for the left ventricle (LV) and consequently a broad range of LV remodeling. The aim of this study was to describe blood flow patterns in the ascending aorta of patients with AS and determine their association with remodeling. METHODS AND RESULTS Thirty-seven patients with AS (14 mild, 8 moderate, 15 severe; age, 63±13 years) and 37 hea...

OBJECTIVE To estimate early diastolic left ventricular inflow pressures in normal subjects and patients with dilated cardiomyopathy, and thus to assess the potential effect of restoring forces. METHODS Early diastolic left ventricular inflow pressures were reconstructed using the ventricular blood as an accelerometer, by measuring velocity at 1 cm intervals within the left ventricle from mitr...

In the present numerical study, thermal performance and fluid flow properties have been investigated to show effect of single-orifice multiple-orifice impingement synthetic jets for dimensionless orifice-toplate distance (H/D) lower than one. Investigations done an actuation frequency f=500 Hz, 0.10 ≤ H/D 0.75, pitch ratio 1.25 Do/D 1.75. The results were validated with experimental from litera...

Fragmentation of rivers has a negative impact on river’s ecological status which can be improved by the construction fishways next to obstacles in that prevent free migration. Flow field characteristics are key factors design process hydraulically efficient fishways—flow and turbulence patterns functional fishway allow fish enter, progress through exit with minimum time/energy expenditure. The ...

A young Hindu lady of about 23 years ot age consulted me for the flow of a limpid fluid from behind the left ear whenever she took food. This complaint had lasted for some 13 years. On examination I found a tiny fistula, with its orifice about half an inch behind the left ear. On enlarging and deepening the orifice nothing abnormal could be detected, but the wound did not heal under antiseptic ...

Weight function distributions for an electromagnetic flow meter with a non-insulating pipe are numerically simulated and verified. The weight function distribution is very important for solution of flow velocity of distribution. In this paper, a finite element method (FEM) is used for solving the weight function distribution for this novel electromagnetic flow meter. First of all, a numerical s...

As part of an effort to develop efficient hollow cathodes for the International Space Station and low power electric propulsion systems, the effects of orifice length-to-diameter aspect-ratio on the performance of 0.5 to 2 A hollow cathodes were examined to compare with previous experiments and a recently developed model. Cathodes were constructed with nominally identical orifice diameters and ...

This study compares three different nozzle flow configurations—central liquid jet with surrounding gas phase, sheet central and inner outer phases. To guarantee constant velocities, as well momentum flows at the orifice, a identical orifice areas (a tube slits) was utilized in experiments. The influence of velocity (GLR), dynamic viscosity liquid, configuration on resulting droplet sizes (D32, ...