In this paper, the integrated parameter method used for the analysis of the dynamiccharacteristics of low frequency fluctuation gas-liquid two-phase flow in horizontal pipeline was presented. The equivalent networks were given in homogenous flow model and separated flow model, respectively.

The stress-optic relations in the steady flow and in the oscillatory shear flow are compared,and their differences are analysed. Then, an assumption of a simplified stress-optic relation in a pulsatile flow is suggeSted and experimental proof that this assumption is suitable for loW frequency pulsatile flow is given.

This paper presents the analysis of the low frequency pulsatile flow field of two dimention aorta valve model by adopting the linear stress-optic relations in a steady flow field. The model was emerged in 1.5% Milling Yellow solution in the experiment.

The equipment can provide low frequency even pulsatile electromagnetic field in the space with the supply of 220V and 40W power,which offering combined therapy of heat and magnitic.

The results of the chart of frequency analysis indicated that the frequency structure of fluctuating pressure intensity was similar and the fluctuating pressure intensity was low-lying frequency.

The anomalous signal of shallow earthquake is stronger, and appears pulse form; For deep earthquake the signal is weak relatively, and appears low-frequency pulsation.

It was found that grid turbulence reduced turbulence intensities in the shear layer and suppressed low frequency fluctuation.

It was found that grid turbulence reduced low frequency fluctuation of the flame fronts, increased the small-scale wrinkles and elevated the mean temperature of the flame zone.

Spectral analysis on low frequency fluctuation in respiratory rhythm in the decerebrate cat

Synchronization of chaotic outputs from mutually injected lasers is observed not only in low frequency fluctuation regimes but also in high frequency fluctuation regions on the nano-second time scale.

These results suggest that low frequency fluctuation of currents depends on the extracellular Ca2+ and underlies the large noise of the 48/ 80-induced inward currents.

By the finite difference method, the effect of pulsation on heat transfer tolaminar flow of pseudoplastic power law fluids in pipes has been studied. Basedon this work, heat flow can be increased by imposing pulsation on the flow, Themore the constant n deviates from 1, the more the heat transfer can be improved.The influence of pulsation for low frequency is greater than that for high freq-uency, For smaller n higher amplitudes can give larger improvements; however,as n becomes larger, high amplitudes increase...

By the finite difference method, the effect of pulsation on heat transfer tolaminar flow of pseudoplastic power law fluids in pipes has been studied. Basedon this work, heat flow can be increased by imposing pulsation on the flow, Themore the constant n deviates from 1, the more the heat transfer can be improved.The influence of pulsation for low frequency is greater than that for high freq-uency, For smaller n higher amplitudes can give larger improvements; however,as n becomes larger, high amplitudes increase the heat flux only by a smallamount, or the heat flux can even be decreasecd slightly.

In accordance with analysis of actual cases, it has been recognized that damages to aprons on rock foundation were chiefly due to vibrations brought about by the pulsating flow of low frequency, destroying at first the bond between the apron and the foundation and subsequently fracturing the apron itself, then leading to further damage through the actions of the pulsatory force.

The turbulence structure, velocity distribution, and spectral density distribution of water flow and Bingham mud flow are studied as the flows carry bed load particles. Experiments prove that average velocity decreases and average velocity gradient increases as the flows carry bed load. Turbulent intensity of flow carrying bed load is much larger than that without bed load. Bingham mud flow could become turbulent in the lower part of the flow while the upper part remains laminar as Reynolds number Rcm is between...

The turbulence structure, velocity distribution, and spectral density distribution of water flow and Bingham mud flow are studied as the flows carry bed load particles. Experiments prove that average velocity decreases and average velocity gradient increases as the flows carry bed load. Turbulent intensity of flow carrying bed load is much larger than that without bed load. Bingham mud flow could become turbulent in the lower part of the flow while the upper part remains laminar as Reynolds number Rcm is between 2000 and 8000. The laminar flow in the upper part is transformed into turbulent flow as bed load particles are put into the flow.These phenomena could be interpreted by understanding the fact that bed load motion increases the Reynolds stress and average velocity gradient, therefore, the energy transmitted from time-averaged motion into turbulence is largely enhanced. The probability density distribution of fluctuating velocity of water flow carrying bed load deviates far from normal distribution. Bed load motion in Binghafn mud flow reduces the autocorrelation coefficient of the turbulent flow. Turbulent energy in Bingham mud flow concentrates in low-frequency (0-1 Hz) turbulent eddies. After adding coarse sand into the mud flow which moves as bed load, the turbulent energy in low-frequency decreases and that in high-frequency turbulence increases, because bed load motion transports energy from low-frequency turbulence to high-frequency turbulence.