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CFD–DEM method is used to study the multi-phase coupling slag discharge flow field of gas-lift reverse circulation in drilling shaft sinking [PDF]
Scientific ReportsTo elucidate the distribution law of the multiphase coupling slag discharge flow field in gas-lift reverse circulation during drilling shaft sinking, a numerical analysis model of gas–liquid–solid multiphase coupling slag discharge was established by CFD–
Longhui Guo +5 more
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Reversing bottom circulation in the Somali Basin [PDF]
Geophysical Research Letters, 2000 Two sets of direct velocity measurements were taken, concurrent with hydrographic data, in the bottom waters of the northern Somali Basin in June and September, 1995. The velocities indicate a temporal flow reversal in the bottom circulation, which is consistent with the changing density structure between the sections.
Molinari, R.L. +3 more
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Spin-polarized vortices with reversed circulation [PDF]
Physical Review A, 2022 We present the analysis of the structure of fermionic vortices with the spin-polarized core from a weak coupling limit to the unitary regime. We show the mechanism for the generation of the {\it reversed circulation} in the vortex core induced by an excess of majority spin particles.
Piotr Magierski +3 more
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Numerical Simulation Study of a Swirling Drill Bit Used for Ice Core Drilling
Journal of Marine Science and Engineering, 2022 Due to its high mechanical penetration rate and lack of pollution of the environment, air reverse circulation drilling is considered to be a promising method for ice drilling.
Mengke Wang +4 more
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Design optimization of a coal seam annular air reverse circulation bit
Energy Science & Engineering, 2023 Reverse circulation (RC) drilling technology enables the rapid acquisition of coal seam samples, which is crucial in accurately measuring gas content. In addition, the design of the drill bit plays a key role in RC sampling. In this study, the turbulence
Demin Chen +3 more
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Energy Science & Engineering, 2023 To solve the insufficient energy for reverse circulation fishing tools in complex structure wells, it is necessary to further optimize the design of the tools to improve the impurity salvage efficiency.
Yumei Li +5 more
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A Study of Reversal of the Circulation in the Lower Extremity [PDF]
Southern Medical Journal, 1915 The operation for reversal of the circulation in the lower extremity, or arteriovenous anastomosis, began to receive attention soon after blood-vessel suturing was put on a stable basis by the work of Carrel and others a little more than a decade ago. Certain cases of gangrene of the foot and leg are caused by gradual occlusion of the arteries in the ...
R. H. Whitehead, J. Shelton Horsley
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Gas reverse circulation drilling technology for large-diameter DTH hammer
Meikuang Anquan, 2023 Large diameter DTH hammer is a drilling tool which has been proved by a lot of engineering practice and can improve the construction efficiency of large diameter drilling on mine surface. However, after drilling into the aquifer, the penetration rate of
ZHAO Jiangpeng
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Meikuang Anquan, 2021 According to the characteristics of shallow depth of collapse column and fault coring borehole in mining face, the hydraulic reverse circulation coring method of horizontal hole is proposed.
ZHAO Jiangpeng
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Energies, 2022 In the early construction of cavern leaching in salt cavern gas storages, the inner leaching tubing is often blocked, frequently leading to the bending deformation phenomenon of the leaching strings, which can result in out-of-control cavity shapes.
Shengwei Dong +7 more
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