Intrinsic permeability of refractories from gas permeability measurements: Comparison of results

2018 ◽  
Vol 44 (3) ◽  
pp. 2900-2910 ◽  
Author(s):  
Emmanuel de Bilbao ◽  
Lise Loison ◽  
Yassine Hbiriq ◽  
Cédric Orgeur ◽  
Séverine Brassamin ◽  
...  
Keyword(s):  
Gas Permeability ◽  
Intrinsic Permeability ◽  
Comparison Of Results

Induced Anisotropic Gas Permeability of Concrete due to Coupled Effect of Drying and Temperature

2016 ◽  
Vol 711 ◽  
pp. 871-878
Author(s):  
Mohamad Ezzedine El Dandachy ◽  
Matthieu Briffaut ◽  
Stefano Dal Pont ◽  
Frederic Dufour
Keyword(s):  
Gas Permeability ◽  
Drying Shrinkage ◽  
Initial Permeability ◽  
Exponential Fitting ◽  
Experimental Measurements ◽  
Intrinsic Permeability ◽  
Experimental Campaign ◽  
Dog Bone ◽  
Micro Cracks ◽  
Permeability Anisotropy

An experimental campaign is carried out to study the effect of drying shrinkage and temperature on multi-directional gas permeability of dry concrete. Thermal loadings up to 250°C are applied on concrete samples in cylinder (11×22) and dog-bone forms (total length of 61 cm). Samples are sliced for permeability measurements. Permeabilities in longitudinal and radial directions are addressed. The cylinder samples are first sliced then dried or heated whilst the dog-bone samples are first dried or heated then sliced. The average of initial intrinsic permeability for the slices (5 cm height, 11 cm diameter) obtained from the (11×22) samples is found isotropic and equal to 2.93×10-17 m2. In this case, drying shrinkage is isotropic. Furthermore, it is shown that for the dog-bone samples, drying shrinkage may induce micro-cracks preferentially in a certain direction which induces permeability anisotropy. Finally, the evolution of the normalized intrinsic permeability with respect to initial permeability versus temperature is found isotropic. An exponential fitting of intrinsic permeability versus temperature is found based on experimental measurements.

scholarly journals Experimental Study on Compression and Intrinsic Permeability Characteristics of Municipal Solid Waste

2019 ◽  
Vol 2019 ◽  
pp. 1-8
Author(s):  
Gang Zeng ◽  
Jun Ma ◽  
Dan Hu ◽  
Jing Wang
Keyword(s):  
Moisture Content ◽  
Municipal Solid Waste ◽  
Power Function ◽  
Gas Permeability ◽  
Permeability Test ◽  
Intrinsic Permeability ◽  
Test Device ◽  
Logarithmic Model ◽  
Permeability Characteristics ◽  
Gas Compressibility

Compression and gas permeability characteristics of municipal solid waste (MSW) are of great significance to the design, construction, management, and operation of landfill. The objective of this paper was to study the compression and gas permeability characteristics of MSW. A compressing test device and gas permeability test device for MSW were introduced, and laboratory tests were carried out. The test results showed that the final strains at the vertical loads of 100 kPa, 200 kPa, 300 kPa, and 400 kPa were 35.8%, 45.1%, 49.2%, and 55.1%, respectively. The natural logarithm of void ratio and pressure was linearly correlated at different times. Intrinsic permeability measured without considering gas compressibility was smaller than that measured with considering gas compressibility. Intrinsic permeability of MSW decreased with the increase of the inlet pressure. It was suggested that the inlet pressure should be set to 3 kPa for the indoor gas permeability test of MSW. Intrinsic permeability of MSW decreases with the increase of water content and compression displacement. Power function and logarithmic model were suitable for the fitting of permeability and porosity of manually prepared fresh MSW samples, while the K-C model was not suitable. With the increase of moisture content, the coefficient and power index of the power function model decreased gradually. And the slope and intercept of the double logarithmic model also decreased gradually with the increase of moisture content.

Experimental research on stress-dependent permeability and porosity of rock-like materials with different thicknesses of smooth hidden joints

2020 ◽  
Vol 34 (12) ◽  
pp. 2050117
Author(s):  
Zhiming Chao ◽  
Guotao Ma ◽  
Xiewen Hu ◽  
Kun He ◽  
Gang Luo ◽  
...  
Keyword(s):  
Gas Permeability ◽  
Permanent Deformation ◽  
Confining Pressure ◽  
Intrinsic Permeability ◽  
Pressure Loading ◽  
Klinkenberg Effect ◽  
Joint Thickness ◽  
Cubic Law ◽  
Loading And Unloading ◽  
Stress Dependent

In this paper, a method is proposed to prepare rock-like materials with different thicknesses of hidden joints. Then, permeability and porosity of the self-prepared jointed specimens under different pore pressures during confining pressure loading and unloading are measured. The experimental results indicate that the gas permeability of the jointed specimens gradually decreases with the rise of pore pressure due to the existence of Klinkenberg effect, and Klinkenberg effect gradually decreases with the rise of hidden joint thickness. As the main seepage channels, hidden joints govern the seepage characteristics, and due to the existence of hidden joints, the intrinsic permeability is improved significantly. Besides, due to the existence of hidden joints, the intrinsic permeability and porosity are more sensitive to confining pressure loading than that of the intact specimen, and the sensitivity increases with the rise of hidden joint thickness. During confining pressure loading, there is a permanent deformation of the hidden joints and pores in the specimens, which results in both the intrinsic permeability and porosity being always lower than those in the loading process. Meanwhile, the permanent deformation rises with the increases of hidden joint thickness, which leads to the increases of gap of intrinsic permeability and porosity under loading and unloading processes. Additionally, after comparison of the fitting results, the sub-cubic law can reflect the relationship between flow rate and the thickness of non-persistent joints better than the cubic law.

ANALYSIS OF GAS PERMEABILITY FOR LIQUID PHASE-SINTERED POROUS SiC COMPACT

2014 ◽  
Vol 17 (8) ◽  
pp. 705-713 ◽  
Author(s):  
Hikaru Maeda ◽  
Yoshihiro Hirata ◽  
Soichiro Sameshima ◽  
Taro Shimonosono
Keyword(s):  
Liquid Phase ◽  
Gas Permeability ◽  
Porous Sic

New Algorithm for Modeling of Bronchial Trees

2012 ◽  
Vol 17 (4) ◽  
pp. 179-190
Author(s):  
Kacper Pluta ◽  
Marcin Janaszewski ◽  
Michał Postolski
Keyword(s):  
Quantitative Analysis ◽  
3D Model ◽  
Ct Images ◽  
Basic Algorithm ◽  
New Model ◽  
Comparison Of Results ◽  
Basic Model ◽  
New Models ◽  
Bronchial Tubes

Abstract The article presents new conception of 3D model of human bronchial tubes, which represents bronchial tubes extracted from CT images of the chest. The new algorithm which generates new model is an extension of the algorithm (basic algorithm) proposed by Hiroko Kitaoka, Ryuji Takaki and Bela Suki. The basic model has been extended by geometric deformations of branches and noise which occur in bronchial trees extracted from CT images. The article presents comparison of results obtained with the use of the new algorithm and the basic one. Moreover, the discussion of usefulness of generated new models for testing of algorithms for quantitative analysis of bronchial tubes based on CT images is also included.

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