Results 151 to 160 of about 1,688 (169)

A study of hydrothermal convection in saturated porous media

Tectonophysics, 1993
Abstract Because of its relevance to many geological and technical problems, hydrothermal convection is investigated here mainly with the aid of numerical models by a systematic analysis of the properties of this type of convection for a range of super-critical Rayleigh numbers.
V.P. Trubitsyn, V.V. Nikolaichik, W.R. Jacoby   +2 more
openaire   +1 more source

The hydrothermal-convection systems of kilauea: an historical perspective

Geothermics, 1993
Abstract Kilauea is one of only two basaltic volcanoes in the world where geothermal power has been produced commercially. Little is known about the origin, size and longevity of its hydrothermal-convection systems. We review the history of scientific studies aimed at understanding these systems and describe their commercial development.
Richard B. Moore, James P. Kauahikaua
openaire   +1 more source

Hydrothermal convection and uranium deposits in abnormally radioactive pluton

Economic Geology, 1978
Hydrothermal 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
openaire   +1 more source

Hydrothermal growth of hydroxyapatite single crystals under natural convection

Journal of Materials Research, 1999
Whiskerlike-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, A. Ito, K. Onuma, T. Tateishi, S. Tsutsumi   +4 more
openaire   +1 more source

Hydrothermal Convection at Ridge Axes

1983
Our 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.
openaire   +1 more source

Convective hydrothermal C02 emission from high heat flow regions

Chemical Geology, 1995
Abstract In addition to volatiles released from volcanoes, the flux of CO2 to the atmosphere from other sources (e.g., metamorphism and subsurface magmatism) represents an important aspect of the global carbon cycle. We have obtained a direct estimate of the present-day atmospheric CO2 flux from convective hydrothermal systems within subaerial ...
Derrill M. Kerrick, Michael A. McKibben, Terry M. Seward, Ken Caldeira   +3 more
openaire   +1 more source

Hydrothermal wave instability of thermocapillary-driven convection in a coplanar magnetic field

Journal of Fluid Mechanics, 1997
We study the linear stability of surface-tension-driven unidirectional shear flow in an unbounded electrically conducting liquid layer heated from the side and subjected to a uniform magnetic field in the plane of the layer. The threshold of convective instability with respect to oblique travelling waves is calculated depending on the ...
Priede, J., Gerbeth, G.
openaire   +2 more sources

Hydrothermal wave instability of thermocapillary-driven convection in a transverse magnetic field

Journal of Fluid Mechanics, 2000
We 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.
openaire   +1 more source

Topographically driven subcritical hydrothermal convection in the oceanic crust

Earth and Planetary Science Letters, 1980
Abstract 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
openaire   +1 more source

Suppression and stimulation of seafloor hydrothermal convection by exothermic mineral hydration

Earth and Planetary Science Letters, 2006
Abstract The effect of serpentinization on hydrothermal convection is explored using a dynamic 2D numerical model. Serpentinization is a highly exothermic mineral hydration process that consumes large quantities of water. The reaction is ubiquitous in the oceanic lithosphere and is generally associated with hydrothermal activity.
Simon Emmanuel, Brian Berkowitz
openaire   +1 more source