Experimental Study On Response Characteristics Of Slug Flow In The Horizontal

Gas-liquid two-phase slug flow is a part of the most frequently occurring flow patterns in a long distance oil and gas transmission pipelines.Due to alternating flow of the liquid slug and gas plug.The flow condition is complicated.At present the research of gas liquid two-phase slug flow is still to be perfect.This experiment with air and water as medium studies the response characteristics of gas liquid two-phase slug flow pressure,differential pressure and liquid holdup in two different diameter organic glass horizontal T-tube.The core contents and conclusions of research are following.Gas-liquid two-phase slug flow through the horizontal T-tube furcation,there will be something of uneven flow distribution,more gas in the radial branch and more fluid in the axial branch.Meanwhile,the flow distribution is more uniform in the variable diameter horizontal T-tube,and the flow distribution is more uniform when the gas superficial velocity is changing.In each section of horizontal T-tube,pressure,pressure amplitude,class cyclical of the pressure fluctuation curve and dispersivity of the probability density function are extended with the increase of gas liquid superficial velocity.In the head pipe,pressure,pressure amplitude and classic cyclical the pressure fluctuation curve is greater than the branch pipe,and all of them in axial branch pipe are greater than the radial branch pipe.Liquid superficial velocity influence on class cyclical of pressure fluctuation is more important than the effect of gas superficial velocity on it.The probability density functions of each section pressure distribution are unimodal and bimodal,multimodal diversity.Pressure of statistical parameters change rule is slightly altered in the same and variable diameter horizontal T-tube.In each section of horizontal T-tube,differential pressure,differential pressure amplitude,class cyclical of the differential pressure fluctuation curve and dispersivity of the probability density function are extended with the increase of gas liquid superficial velocity.In the head pipe,class cyclical of the differential pressure fluctuation curve and the difference between two pressure points is greater than the branch pipe,and all of them in axial branch pipe are greater than the radial branch pipe.Only in the radial branch pipe of the same diameter,the probability density function of differential pressure fluctuation curve shows bimodal distribution,other sections were unimodal normal distribution.In the radial branch pipe of the same diameter,the scope of the power spectral density is the most important thing,and the scope and amplitude change of it is not obvious.In the other section,the scope of the power spectral density are raised with the increase of gas liquid superficial velocity,and the amplitude change of it is irregular.The differential pressure of statistical parameters changes rule is slightly unusual in the same and variable diameter horizontal T-tube.In the head pipe of horizontal T-tube,the change trend of liquid holdup fluctuation curve is class cycle,and the more observable regularity of it with the increase of liquid superficial velocity.The probability density function of liquid holdup fluctuation curve is bimodal.The high liquid holdup peak is in correspondence with liquid holdup within the slug and the low liquid holdup peak is incorrespondence with liquid holdup within the film.Gas-liquid superficial velocity was significantly affect the movement of the liquid holdup peak.