نتایج جستجو برای: permeability coefficient

تعداد نتایج: 217403  

2005
T. D. Stark

The objectives of this technical note are to review the gas transport mechanisms through flexible geomembranes, and to measure the methane gas transmission rate, permeance, and permeability coefficient of PVC, LLDPE, and HDPE geomembranes by performing the standard gas transport test (ASTM D1434). The measured methane gas permeability coefficient through a PVC geomembrane is 7.55 3 10 ml(STP).m...

2010
Takashi Tanaka Stavros Avramidis Satoshi Shida

Ultrasonic pre-treatment of small and pressure saturated Douglas-fir heartwood specimens at 20 kHz fixed frequency with an acoustic horn resulted in increased specific permeability coefficient in both radial and tangential directions. Statistical analysis revealed that there was a high correlation between ultrasonic treatment time and specific permeability coefficient. Improvement rate of perme...

Journal: :Huan jing ke xue= Huanjing kexue 2009
Hui Liu Tao Huang Chi Zhang

Refuse degradation and landfill leachate treatment are the main research directions of landfill technology at present, but permeability characteristics of landfill body are paid little attention on. According to this actuality, the study selected four kinds of landfill's bodies under different pressures as study objects and tested the permeability characteristics in the stage of main compressio...

Journal: : 2023

A simple technique is proposed in this paper for estimating the coefficient of permeability an unsaturated soil based on physical properties soils that include grain size analysis, degree saturation or water content, and porosity soil. The method requires soil-water characteristic curve prediction as most conventional methods. procedure to define hydraulic conductivity function from which measu...

Journal: :IOP Conference Series: Earth and Environmental Science 2019

The soil is a heterogeneous and anisotropic medium. Hydraulic conductivity, an intrinsic property of natural alluvial deposits varies both deterministically and randomly in space and has different values in various directions. In the present study, the permeability of natural deposits and its influence on the seepage flow through a natural alluvial deposit is studied. The 2D Finite Difference c...

Ma Yongxin mingjun li, Yi Xiangyi

Inflow control devices (ICD), which prevent water breakthrough by controlling the inflow profile of a well, have been used successfully in many oilfields. This paper will introduce a new discovery and an unsuccessful example. Moreover, this paper investigates meticulously and thoroughly to find the application conditions of the new discovery. Based on permeability rush coefficient and permeabil...

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