Results 261 to 270 of about 54,048 (301)

Microcirculatory response to periodic pulsations in capillary pressure

Microvascular Research, 1982
Abstract A mathematical analysis of time-dependent convection and diffusion in the microcirculation is presented in order to ascertain the effect on capillary-tissue fluid exchange of cardiac pulsatility and the rhythmic contractions of arterioles and precapillary sphincters.
E P, Salathé, R, Venkataraman, J F, Gross   +2 more
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Research on a new pressure pulsator

Physics of Fluids
Pulsators are widely used to study the dynamic characteristics of liquid flow components. However, it is difficult to adapt the existing actuators to the excitation requirements under high pressures, low temperatures, and toxic media. This study describes the design of a novel pressure pulsation device and presents the results of simulations and ...
Su Yong, Gong Wu-Qi
openaire   +1 more source

Piping Vibration due to Pressure Pulsations: Review

Advanced Materials Research, 2013
Excessive piping vibrations are a major cause of machinery downtime, leaks, fatigue failure, high noise, fires and explosions in refineries and petrochemical plants. In piping system, vibration excitation sources may come from mechanical sources, hydraulics sources or can be the combination of both.
M. Haryzul Ghazali, Lim Meng Hee, M. Salman Leong   +2 more
openaire   +1 more source

Further Pressure Pulsation Reduction in Fuel Rails

SAE Technical Paper Series, 2003
<div class="htmlview paragraph">Fuel rails with integrated damping effect (FRID's), developed for MPI returnless fuel supply system s, effectively reduce fuel pressure pulsations without pulsation dampers (P/D's). One of the remained issues on FRID's is discussed in this paper.
Tetsuo Ogata, Yoshiyuki Serizawa, Hikari Tsuchiya, Koichi Hayashi, Kazuteru Mizuno   +4 more
openaire   +1 more source

Pressure Pulsations in Flow Through Branched Pipes

Journal of the Hydraulics Division, 1966
Pronounced cyclic variations in pressure and in flow into opposing laterals from a common pipe or conduit have been observed in several widely different and independent pipe systems. In one instance, noise operation of two centrifugal pumps was encountered where the suction pipes were joined in a common intake line. Unsteady flow also has been observed
David L. Appel, Yun-Sheng Yu
openaire   +1 more source

Protection of manometers when measuring pulsating pressures

Measurement Techniques, 1960
The above damper provides an almost complete suppression of pulsations at the resonant frequency of the manometer transducer; moreover the time constant of the manometer transducer increases only a little (∼1/4−1/6 that of the known damping devices).
A. S. Lifshits, I. P. Mandel'berg
openaire   +1 more source

Axially-cracked pipes under pulsating internal pressure

International Journal of Fatigue, 2000
Approximate values of stress-intensity factor along the front of an external axial (longitudinal) surface flaw in a round pipe subjected to an internal pressure are computed by employing both the superposition principle and the power series expansion of the actual hoop stress distribution.
openaire   +2 more sources

Survey of gauges for measuring pressure pulsations

Measurement Techniques, 1998
A survey is made of thin-film and bulk gauges of different types for measuring pressure pulsations in aviation technology.
openaire   +1 more source

Experimental study of separation-zone pressure pulsation

Fluid Dynamics, 1972
We examine extremely nonuniform separated water flow in the initial segment of a penstock of rectangular section resulting from the separated flow past a two-dimensional gate. The meansquare deviations p', one-dimensional frequency spectra S(ω), spatial correlations r(x), and distribution functions F(p) of the pressure pulsation are determined ...
openaire   +1 more source

Model and Prototype Draft Tube Pressure Pulsations

1996
All producers of Francis turbines daily meet the problem of draft tube vortex appearance and its consequences [1,2,3,4]. Limitations in turbine operation because of the vortex appearance and undesirable consequences on hydraulic system are sufficient reason for its intensive researching.
Vladimir Kercan, Marin Bajd, Vesko Djelić, Andrej Lipej, Dragica Jošt   +4 more
openaire   +1 more source