Some Studies on the Analyses of In-Situ Permeability Tests

Kohno, Iichiro; Nishigaki, Makoto

doi:10.3208/sandf1972.23.4_157

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…The results were compared with the ASTM standard grain charts to evaluate the average grain size. 15 Results and discussion…”

Section: Methodsmentioning

confidence: 99%

“…It should be mentioned that despite the excellent hot temperature properties of A-286 and its extensive use in large forging parts such as gas turbine discs, its hot deformation behaviour has rarely been assessed. 15,16,21 Moreover, a satisfied model considering the flow behaviour of this alloy and the effect of various hot deformation parameters on its microstructure has not been performed yet. The aim of the present research is to assess the hot deformation behaviour of A-286 alloy to present a relation between the grain size and the hot deformation parameters at the appropriate temperature and strain rate.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] For example, Tian and his co-workers have studied the microstructure changes relating to dynamic recrystallisation (DRX) and dynamic recovery (DR) during the hot deformation of Nimonic 80A. They have utilised the dislocation density to study the microstructural changes.…”

Section: Introductionmentioning

confidence: 99%

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Flow behaviour and microstructural evolution of 53Fe–26Ni–15Cr superalloy during hot compression test

Salehi¹,

Taheri²

2007

Ironmaking & Steelmaking

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The microstructure and mechanical properties of Incoloy A-286 { forgings are sensitive to thermomechanical processing. In this research the hot deformation behaviour of A-286 superalloy is characterised in the temperature range of 1000-1100uC and strain rate range of 0 . 001-0 . 1 s 21 using the compression tests in order to develop a correlation between the grain size and the process parameters. It is found that at a strain rate of 0 . 001 s 21 in the temperature range of 1000-1100uC and at a strain rate of 0 . 01 s 21 in the temperature range of 1050-1100uC, the material exhibits dynamic recrystallisation (DRX), while at a strain rate of 0 . 01 s 21 and at the temperature of 1000uC and at a strain rate of 0 . 1 s 21 and in the temperature range of 1000-1100uC, the alloy exhibits the dynamic recovery (DR).

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“…The results were compared with the ASTM standard grain charts to evaluate the average grain size. 15 Results and discussion…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Flow behaviour and microstructural evolution of 53Fe–26Ni–15Cr superalloy during hot compression test

Salehi¹,

Taheri²

2007

Ironmaking & Steelmaking

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Measuring hydraulic permeability in a streambed using the packer test

et al. 2005

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Abstract:Permeability of a streambed is an important factor regulating nutrient and oxygen availability for aquatic biota. In order to investigate the relationship, an accurate permeability should be measured. However, it is difficult to measure permeability in a coarse gravel bed using a conventional permeability test. Moreover, turbulent flow may occur in coarse bed material, and then deviations from Darcy's law do occur. Thus, permeability calculated following Darcy's law may be overestimated under turbulent flow conditions and should be corrected. The packer test can be used in highly permeable gravel beds. We developed a field method applicable to a gravel bed using the packer test and derived an equation adopting a law of turbulent flow to study the problems under any type of flow condition. The accuracy of the equation was examined using a laboratory flume with a gravel bed. The results suggested that permeability calculated from Hvorslev's equation is overestimated for turbulent flow. In contrast, our equation, developed here, could evaluate permeability accurately under any type of flow condition.

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Analysis of partially penetrating slug tests in a stratified formation by alternating piezometer and tube methods

Sakata

Imai²,

Ikeda

et al. 2015

Journal of Hydrology

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In partially penetrating slug tests, hydraulic conductivity (K) estimates might not necessarily be valid because of vertical flows in heterogeneous formations. We assess the error in hypothetical stratified formations by numerical sensitivity analysis, and propose an effective method for compensation by incorporating two types of casing configuration (piezometer and tube). The hypothetical stratified formation consists of completely horizontal layers, each 1 m thick; the permeability is different between, but not within, layers. In this study, conductivity estimates in the piezometer and tube methods are calculated by assigning various patterns of conductivity to the test, upper, and lower layers: K T , K U , and K L . The effect of vertical flow becomes significant when K T is small relative to K U or K L , and K L is more important than K U because the base of the borehole is open to the lower formation. The conductivity ratios (estimate over actual value) are treated as approximately linearly dependent on logarithms of K T /K U and K T /K L , so that conductivity estimates can be straightforwardly derived from one piezometer measurement and two tube measurements at the top and bottom of the screen. The linear relations are evaluated and constant parameters are determined under specific conditions. This study also recommends alternating piezometer and tube methods in the drilling procedure because the actual variation of K with depth is larger than that found using isolated measurements, as shown in a field study of alluvial fan gravel deposits in Sapporo, Japan. KeywordsSlug tests, Partially penetrating well, Hydraulic conductivity, Sensitivity analysis, Numerical simulation, Heterogeneity 1．IntroductionSlug tests are employed in both practical engineering and scientific studies to determine in situ hydraulic conductivity, K, by measuring the recovery of head in a single borehole after artificially raising or lowering the water level in the well. Although slug tests are sensitive to artificial and natural conditions in the well (e.g., Black, 2010), they are useful because they are simpler, cost less, and require less equipment than multiple pumping tests. It is also common for slug tests to have a logistical advantage, especially in groundwater contamination investigations. One reason is that slug tests can be conducted without removing or adding water, by lowering a solid piece of metal, called a slug, into a well, which does not disturb the site of suspected contamination. Another reason is that slug test results are related mainly to permeability on a small scale, and thus local information is directly relevant to preferential flow paths for contamination plumes. In addition, a series of slug tests at multiple depths aids in interpreting vertical variations of K.When such vertical profiles are interpolated among different locations, three dimensional distributions of K can be obtained for an individual site. Various previous studies have shown the spatial variability in K obtained from slug test an...

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Some Studies on the Analyses of In-Situ Permeability Tests

Cited by 4 publications

References 14 publications

Flow behaviour and microstructural evolution of 53Fe–26Ni–15Cr superalloy during hot compression test

Flow behaviour and microstructural evolution of 53Fe–26Ni–15Cr superalloy during hot compression test

Measuring hydraulic permeability in a streambed using the packer test

Analysis of partially penetrating slug tests in a stratified formation by alternating piezometer and tube methods

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