Background 4D flow MRI provide a wonderfully rich set of data for diagnosis and understanding of cardiac disease. Interpretation of this wealth of data can be challenging and it may be desirable to simplify it to make analysis manageable. We have observed interesting rotational behavior of blood in the aorta in a number of cardiac diseases. Circulation (Γ) is a metric used in fluid dynamics to ...

A 1-D and 2-D cylindrical flow stability is investigated in this paper. A typical velocity profile in a shear layer with infection point is studied first. The fluid motion is decomposed to two parts: the rotational part and shear part. Linear stability analysis shows the rotational part (like rigid body) is stable but the shear part is unstable. Of course, the shear layer with inflection point ...

This paper is concerned with the benefits of using rotational measurements of a gyroscope in conjunction with optical flow to determine the instantaneous rigid motion. It presents an experimental study focusing on three main aspects: speedup, resolving ambiguities due to local minima and accuracy. For this sake, we developed a method to minimize simultaneously the reprojected optical flow error...

The ability to judge heading during tracking eye movements has recently been examined by several investigators. To assess the use of retinal-image and extra-retinal information in this task, the previous work has compared heading judgments with executed as opposed to simulated eye movements. For eye movement velocities greater than 1 deg/sec, observers seem to require the eye-velocity informati...

A mathematical analysis has been carried out for the axial flow of a Bingham plastic fluid, in the Concentric Cylinder Viscometer which consists of a cylindrical sample holder (the cup) and a cylindrical spindle (the bob) coaxial with the cup. The fluid to be tested flows through the annular gap of the cup and the bob system, sheared by the rotation of the inner cylinder, while the outer cy...

This paper describes development of water hydraulic proportional valves. The valves are spool-type and the spool is driven by a stepping motor and positive cam mechanism. The cam is always placed between two cam followers and the return spring is omitted. The rotational angle of the cam and the displacement of the spool is linear. The experimental results of static characteristics are also show...

external fluted feed rolls are commonly used in grain drills. the fluted feed roll meters a volume of seeds and does not singulate the seeds as do the precision planters; therefore, there will be inherent variation in the number of seeds delivered per unit of time. this research was conducted to investigate the effect of seed meter drive shaft and ground speeds and outlet positions in a grain d...

In order to improve the mathematical model of working process above-bit ejection system for conditions its asymmetric rotation in well, a method modeling circulating injected flow using hydrodynamic vortex function, center which is shifted relative axis mixing chamber jet pump, has been developed. rotating movement flow, concept circulation vector translational velocity liquid along closed circ...

Uncertainty quantification (UQ) has been achieved for the first time on the self-noise prediction of a low-subsonic axial fan. Realistic 5% and 4% errors are introduced on the volume flow-rate and the rotational speed, respectively, and a set of 81 ReynoldsAveraged Navier-Stokes (RANS) simulations of the fan mounted on an axisymmetric test plenum has been simulated at Clenshaw-Curtis points. By...

Abstract. If a fluid enters an axially rotating pipe, it receives a tangential component of velocity from the moving wall, and the flow pattern change according to the rotational speed. A flow relaminarization is set up by an increase in the rotational speed of the pipe. It will be shown that the tangentialand the axial velocity distribution adopt a quite universal shape in the case of fully de...