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Petroleum Migration and Accumulation
Published in Muhammad Abdul Quddus, Petroleum Science and Technology, 2021
Generally, it is said the higher the porosity higher the permeability. The permeability increases linearly with porosity. But it is not always true. Permeability is controlled by many factors other than porosity as well. The type of porosity (effective porosity) is more important than the total porosity. Grain size and pore shape are the other main factors. The pores in the rock are either interconnected or exist separately. The pores are interconnected through small channels between the grains. The small channels are known as ‘pore throats’. The throats have very small diameters. Narrow throat channels offer hindrance to the fluid flow. Narrow pore throats are more common in rocks containing small sized particles. Some factors are more effective for a particular rock than others.
Soil Mechanics
Published in P.K. Jayasree, K Balan, V Rani, Practical Civil Engineering, 2021
P.K. Jayasree, K Balan, V Rani
The property of the soil which permits flow of water through it is called the permeability. The permeability is the ease with which water can flow through it. Permeability is a very important engineering property of soils. A knowledge of permeability is essential in a number of soil engineering problems such as settlement of buildings, yield of wells, seepage through and below the earth structure. It controls the hydraulic stability of soil masses. The permeability of soils is also required in the design of filters used to prevent piping in hydraulic structures.
Laboratory permeability testing of chipseal road surfaces
Published in A. Kumar, A.T. Papagiannakis, A. Bhasin, D. Little, Advances in Materials and Pavement Performance Prediction II, 2020
S.P. Huszak, T.F.P. Henning, P. Herrington
Head’s (1982) formula for calculating a constant of permeability (k), measured in metres per second (m/s) was adopted. It should be noted that k is a one dimensional parameter that is originally intended to apply to a porous medium of a given thickness (for example, a particular type of soil). To apply this formula to chipseals, being composite systems, it was necessary to determine the thickness of each seal.
Finite element analysis of the impact of particles aggregation on the thermal conductivity of nanofluid under chemical reaction
Published in Waves in Random and Complex Media, 2023
Liaqat Ali, Bagh Ali, Taimoor Iqbal
It has been seen that a porous medium with a higher permeability also has a higher porosity value. It is observed that the boundary layer thickness enhances with the enhancement in the porosity parameter. This is because permeability variations lead to declines in heat flux, which leads to an increase in temperature gradient. The microrotation accelerates as the norms adjacent to the cylinder's surface increase, but the negative reaction is identified afield from the surface. The function of on the velocity field is included in Figure 2(d). The velocity field is shown to significantly increase with steadily rising values of λ (1 to 9). It is because the hydrostatic pressure is stronger; higher values of implicate a higher hydrostatic pressure where it coincides with a higher flow field. Figure 2(e) depicts the diminishing pattern of the velocity field across the surging Prandtl number norms, as well as the intensifying influence of flow velocity on the surging norms of the heat source parameter. It is revealed that when the heat source parameter norms increase, the temperature of the fluid boosts up. Figure 5(a–c) depicts a sequential order in the decrement of velocity with intensifying Reynolds (Re) values as well as the radiation parameter. In the thermal radiation case the effect of nanoparticle aggregation on temperature is stronger as compare non-aggregation case.
On the permeability of layered soil system: experimental study
Published in International Journal of Geotechnical Engineering, 2022
Abdulla A. Sharo, Mohammaed S. Al-Zoubi, Areen M. Al-Ababneh
Permeability, known also as hydraulic conductivity, is the capacity of a soil to permit the passage of fluids through its interconnected voids, where the flow of fluids is from a point of high energy to a point of lower energy. Permeability is an important soil property in geotechnical engineering, and it is usually expressed in terms of a related coefficient named the coefficient of permeability,. The value of the coefficient of permeability of soils plays a significant role in the field of geotechnical analysis such as analysing and designing earth dams, studying and controlling soil slopes, designing retaining structures, and checking and controlling the soil settlement and groundwater flow (Das and Sobhan 2013). For homogeneous soil deposits, various factors affect the coefficient of permeability including fluid viscosity, fluid polarity, unit weight, particle size and particle size distribution, soil mineralogy, void ratio, soil structure, and the degree of saturation (Das and Sobhan 2013; Mesri and Olson 1971).
Estimation of permeability of soil using easy measured soil parameters: assessing the artificial intelligence-based models
Published in ISH Journal of Hydraulic Engineering, 2021
Balraj Singh, Parveen Sihag, Siraj Muhammed Pandhiani, Sourav Debnath, Saurabh Gautam
Soils are permeable materials due to existence of voids in it, which allow the flow of water from higher to lower energy levels. Permeability is the ability of the material by which it transfers the gases/fluid within the voids. Permeability of soil is a vital engineering property in various soil-related problems like as yield of wells, seepage through dam, cut-off wall and diaphragm wall, seepage through and below the earth structures, etc. Exact knowledge of soil permeability is essential for understand the seepage under dams and other hydraulic structure-related problems. Permeability of soil is influenced by various factors including texture of soil, type of soil, voids ratio, density of soil, and impurities in soil (Harris and Bond 2006). It is also affected by grading curve, level of saturation, soil structure, and soil imperfections or discontinuities (Smith 2014).