Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Powiadomienia systemowe

Sesja wygasła!

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Numerical simulation of pulsating blood flow through stenosed vessel

Kohge K., Minemura K.

International Journal of Applied Mechanics and Engineering

2003

Vol. 8, no spec.

155-161

In connection with blood flow in stenosed blood vessels, Ojha and his co-workers have been measured pulsating flows in rigged pipes with a contraction using kerosene. The experiment, however, leaves something to be desired, for example, the pressure fluctuation relevant to the pulsating flow velocity is entirely unknown. To make clear the mechanism of the pulsating flow in the stenosed pipes, the flow is numerically simulated, in this paper, using a finite difference method with CIP scheme. Obtained axial velocity distributions and thickness of separation region are confirmed with Ojha's experimental results. Resultant flow brings about large periodical change of wall stress in the downstream and of pressure at the contraction, respectively, suggesting that the flow behaviour relates closely with arterial diseases.

Effects of design parameters on air-water two-phase flow performance of a radial-flow pump

Minemura K., Kinoshita K., Ihara M., Egashira K.

Applied Mechanics and Engineering

1998

Vol. 3, no 1

89-109

In offshore oil field development, we foresee an increase in the demand for oil - well pumps having improved gas handling capacity. To meet the demand by improving the performance of a radial-flow centrifugal pump of low specific speed, many kinds of impellers, fabricated by changing systematically the design parameters, such as discharge angle, location and shape of leading edge, number of blades, location of the split for dividing the blade length into two parts and so on, were experimentally investigated under air-water two-phase flow conditions to clarify the parameters on pump performance. The optimum blade is found to be one that has a split in the latter half of the impeller and is installed with discharge angle of approximately 90o.