Results 211 to 220 of about 2,658 (235)
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Hydrothermal convection at slow-spreading mid-ocean ridges
Tectonophysics, 1979Abstract The discrepancy observed between measured heat flow data and the heat flow predicted by thermal models of mid-ocean ridges is commonly explained by the presence of hydrothermal convection in young oceanic crust. Numerical modelling of fluid flow through porous media has been used to investigate what permeability, depth of penetration and ...
Udo Fehn, Lawrence M. Cathles
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Hydrothermal Convection at Ridge Axes
1983Our knowledge of hydrothermal circulation at the ridge axis is based largely on sampling of the hydrothermal fluid, indirect geophysical measurements of the oceanic crust, and studies of rocks which are believed to have undergone hydrothermal alteration at the ridge axis.
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Hydrothermal convection and uranium deposits in abnormally radioactive pluton
Economic Geology, 1978Hydrothermal uranium deposits are often closely associated with granites of abnormally high uranium content. We have studied the question as to whether the heat generated within such granites can cause fluid convection of sufficient magnitude to develop hydrothermal uranium deposits.
U. Fehn, L. M. Cathles, H. D. Holland
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Hydrothermal wave instability of thermocapillary-driven convection in a transverse magnetic field
Journal of Fluid Mechanics, 2000We study the linear stability of thermocapillary-driven convection in a planar unbounded layer of an electrically conducting low-Prandtl-number liquid heated from the side and subjected to a transverse magnetic field. The thresholds of convective instability for both longitudinal and oblique disturbances are calculated numerically and also ...
Priede, J., Gerbeth, G.
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Hydrothermal growth of hydroxyapatite single crystals under natural convection
Journal of Materials Research, 1999Whiskerlike-shaped hydroxyapatite single crystals with the calcium-deficient nature were hydrothermally grown under natural convection by using a temperature-gradient-applied pressure vessel. With this method, crystals grew thinner with a smaller tapering angle than those grown under the nonconvection. Maximum length of the crystals grown under natural
K. Teraoka +4 more
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Topographically driven subcritical hydrothermal convection in the oceanic crust
Earth and Planetary Science Letters, 1980Abstract A simple analytical model for investigating topographically induced subcritical hydrothermal convection in either barren or thickly sedimented oceanic crust is developed. The results show that for unsedimented, low-amplitude, wave-like topography, the maximum topographically induced vertical convective flow may be of the order of 10 −10 m/s
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2009
The permeability of the oceanic crust is the primary hydrologic parameter that controls the geometry, the vigor, and the duration of hydrothermal fluid flow at mid-ocean ridges. The coupling of fluid flow, temperature, and chemistry and the effect of the permeability on these coupled processes are assessed to determine whether geochemical data can be ...
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The permeability of the oceanic crust is the primary hydrologic parameter that controls the geometry, the vigor, and the duration of hydrothermal fluid flow at mid-ocean ridges. The coupling of fluid flow, temperature, and chemistry and the effect of the permeability on these coupled processes are assessed to determine whether geochemical data can be ...
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Effect of Hydrothermal Pretreatment on Convective Drying Characteristics of Paper Sludge
ACS Sustainable Chemistry & Engineering, 2014This work concerns the influence of hydrothermal (HT) pretreatment on sludge drying performance. Sludge was dried in an air duct dryer at a temperature of 30.4 ± 0.4 °C with a constant air velocity of 1.34 ± 0.04 m/s and a relative humidity of about 56%.
Zhao, P. +4 more
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A model for hydrothermal convection in the rhine graben and its tectonic implications
Tectonophysics, 1981Abstract It is suggested that the geothermal anomalies of the Rhine graben have been caused by hydrothermal convection. Mathematical modelling yields a good agreement between the calculated and the measured temperatures. The age of the geothermal anomalies may be at least 80,000 years, depending on discharge and maximum depth of convection.
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Hydrothermal Convection Systems and Geothermal Energy in the Southwest China
2017This chapter is the assessment of geothermal resources (high and intermediate temperature) of the Qingzang Plateau and its surroundings. Based on the average of SiO2, Na–K, Na–K–Ca and K–Mg geothermometers, 107 high-temperature hydrothermal convective systems have been determined and then their installed capacity has been estimated.
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