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Dive into the research topics where Teklu Hadgu is active.

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Featured researches published by Teklu Hadgu.


SpringerPlus | 2014

Applications of fractured continuum model to enhanced geothermal system heat extraction problems

Elena Arkadievna Kalinina; Katherine A. Klise; Sean Andrew McKenna; Teklu Hadgu; Thomas Stephen Lowry

This paper describes the applications of the fractured continuum model to the different enhanced geothermal systems reservoir conditions. The capability of the fractured continuum model to generate fracture characteristics expected in enhanced geothermal systems reservoir environments are demonstrated for single and multiple sets of fractures. Fracture characteristics are defined by fracture strike, dip, spacing, and aperture. The paper demonstrates how the fractured continuum model can be extended to represent continuous fractured features, such as long fractures, and the conditions in which the fracture density varies within the different depth intervals. Simulations of heat transport using different fracture settings were compared with regard to their heat extraction effectiveness. The best heat extraction was obtained in the case when fractures were horizontal. A conventional heat extraction scheme with vertical wells was compared to an alternative scheme with horizontal wells. The heat extraction with the horizontal wells was significantly better than with the vertical wells when the injector was at the bottom.


Archive | 2015

Thermal-Hydrology Simulations of Disposal of High-Level Radioactive Waste in a Single Deep Borehole

Teklu Hadgu; Emily Stein; Ernest Hardin; Geoffrey A. Freeze; Glenn E. Hammond

Simulations of thermal-hydrology were carried out for the emplacement of spent nuclear fuel canisters and cesium and strontium capsules using the PFLOTRAN simulator. For the cesium and strontium capsules the analysis looked at disposal options such as different disposal configurations and surface aging of waste to reduce thermal effects. The simulations studied temperature and fluid flux in the vicinity of the borehole. Simulation results include temperature and vertical flux profiles around the borehole at selected depths. Of particular importance are peak temperature increases, and fluxes at the top of the disposal zone. Simulations of cesium and strontium capsule disposal predict that surface aging and/or emplacement of the waste at the top of the disposal zone reduces thermal effects and vertical fluid fluxes. Smaller waste canisters emplaced over a longer disposal zone create the smallest thermal effect and vertical fluid fluxes no matter the age of the waste or depth of emplacement.


Archive | 2012

ANALYSIS OF THE EFFECTS OF HETEROGENEITY ON HEAT EXTRACTION IN AN EGS REPRESENTED WITH THE CONTINUUM FRACTURE MODEL

Elena Arkadievna Kalinina; Sean Andrew McKenna; Teklu Hadgu; Thomas Stephen Lowry


International Journal of Rock Mechanics and Mining Sciences | 2007

Determination of heat capacity of Yucca Mountain stratigraphic layers

Teklu Hadgu; Clinton C. Lum; James E. Bean


Geothermics | 2016

Modeling of heat extraction from variably fractured porous media in Enhanced Geothermal Systems

Teklu Hadgu; Elena Arkadievna Kalinina; Thomas Stephen Lowry


Archive | 2006

Measurement and Modeling of Energetic-Material Mass Transfer to Soil-Pore Water

Stephen W. Webb; James M. Phelan; Teklu Hadgu; Joshua S Stein; Cedric M Sallaberry


Archive | 2011

Systems Engineering Analysis.

Thomas Stephen Lowry; Sean Andrew McKenna; Teklu Hadgu; Elena Arkadievna Kalinina


MRS Online Proceedings Library Archive | 2011

Preliminary Performance Assessment for Deep Borehole Disposal of High-Level Radioactive Waste

Peter N. Swift; Bill Walter Arnold; Patrick V. Brady; Geoffrey A. Freeze; Teklu Hadgu; Joon H. Lee


Archive | 2010

Thermal-hydrologic-chemical-mechanical modeling of deep borehole disposal.

Courtney Grant Herrick; Bill Walter Arnold; Daniel James Clayton; Teklu Hadgu


Archive | 2008

SENSITIVITY ANALYSES OF RADIONUCLIDE TRANSPORT IN THE SATURATED ZONE AT YUCCA MOUNTAIN NEVADA.

Bill Walter Arnold; Teklu Hadgu; Cedric Jean-Marie Sallaberry

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Yifeng Wang

Sandia National Laboratories

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Thomas Stephen Lowry

Sandia National Laboratories

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Ernest Hardin

Sandia National Laboratories

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Katherine A. Klise

Sandia National Laboratories

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Bill Walter Arnold

Sandia National Laboratories

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Carlos F. Jove-Colon

Sandia National Laboratories

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Edward N. Matteo

Sandia National Laboratories

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Geoffrey A. Freeze

Sandia National Laboratories

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