Hygrothermal and mechanical model of concrete at high temperature

1998 ◽  
Vol 31 (6) ◽  
pp. 378-386 ◽  
Author(s):  
Carmelo E. Majorana ◽  
Valentina Salomoni ◽  
Bernhard A. Schrefler
Keyword(s):  
High Temperature ◽  
Mechanical Model

Geo-Thermo-Mechanical Modeling of Pre-Drilled Wellbores to Extract Geothermal Energy from Subsurface to Produce Cleaner Energy for United Arab Emirates

2021 ◽  
Author(s):  
Ubedullah Ansari ◽  
Najeeb Anjum Soomro ◽  
Farhan Ali Narejo ◽  
Shafquat Ali Baloch ◽  
Faiz Ali Talpur
Keyword(s):  
High Temperature ◽  
United Arab Emirates ◽  
Mechanical Model ◽  
Geothermal Energy ◽  
Oil And Gas ◽  
Middle Eastern ◽  
Clean Energy ◽  
Thermal Recovery ◽  
Abandoned Wells ◽  
Single Well

Abstract The middle eastern countries including United Arab Emirates (UAE) have enjoyed the energy production from hydrocarbon resource for a very long period. Indeed, now various countries in this region has shifted to alternative resources of power generation with cheaper and cleaner sources. Geothermal is the top of the list among those sources. Therefore, this study presents an ultimate model converting abandoned oil and gas wells into subsurface geothermal recovery points. Fundamentally, this study offers a geo-thermo-mechanical model of abandoned wellbore which can help in developing an optimistic geothermal energy not only from subsurface thermal reserve but also from abandoned casing and pipes installed in Wellbores. In this approach the source of heat is thermally active rock formations and the metallic pipes that are present in wellbores drilled through hot dry rocks. In the model the already drilled wells are incorporated as medium of heat flow in which water in injected and brought back to surface along with thermal impact. The results of this study revealed that, at the depth of 6000 m of high temperature wellbore the temperature is above 85°C and at this temperature the metallic casings further rise the reserve temperature thus the conversion of water into steam can be processed easily. Moreover, at high depths the stability of wellbore is also issue in high temperature formation, so mechanical model suggests that injection of water and conversion into steam in already cased wellbore can sustain up to 6 MPa stress at around 100C. Thus, the geo-thermo-mechanical model of wellbore will illustrate the possibility of converting water into steam and it will also reveal the average amount of heat that can be generated from a single well. henceforth, the thermal recovery from abandoned wells of UAE is best fit solution for clean energy. The abandoned wells are used as conduit to transport heat energy from subsurface by using water as transport medium, as water at surface temperature is injected in those wellbores and let thermal energy convert that water into steam. Later the steam is returned to surface and used as fuel in turbines or generators.

scholarly journals Integrated optical-thermal-mechanical model for investigations into high temperature sodium receiver operation

Solar Energy ◽  
2019 ◽  
Vol 194 ◽  
pp. 751-765 ◽  
Author(s):  
Tim Conroy ◽  
Maurice N. Collins ◽  
Ronan Grimes
Keyword(s):  
High Temperature ◽  
Mechanical Model ◽  
Integrated Optical

Electromagneto-mechanical model of high temperature superconductor insert magnets in ultra high magnetic fields

2022 ◽  
Author(s):  
Frederic Trillaud ◽  
Edgar Berrospe-Juarez ◽  
Vı́ctor M. R. Zermeño ◽  
Francesco Grilli
Keyword(s):  
Magnetic Field ◽  
High Temperature ◽  
High Magnetic Field ◽  
Mechanical Model ◽  
Safety Margin ◽  
Magnetic Flux Density ◽  
Mechanical Degradation ◽  
Relative Deformation ◽  
Induced Field ◽  
The Impact

Abstract Second-Generation High Temperature Superconducting (2G HTS) tapes are considered to be the main candidates for the development of future ultra high DC magnetic field magnets. In such application, the usability of the HTS magnets can be strongly impaired by large screening currents developed in the flat strip of the tapes. These currents lead to the generation of a Screening Current Induced Field (SCIF) that can deteriorate the performance by affecting the stability and the homogeneity of the magnetic field. Besides the SCIF, there is also the likely mechanical degradation of the tapes under the action of large Lorentz forces. The mechanical degradation and the presence of large screening currents intertwine to affect the reliable operation of 2G HTS magnets. To study those combined issues, an electromagneto-mechanical model based on tensile mechanical characterization of short samples was built to simulate the coupled electromagnetic and mechanical behaviour of insert magnets made of 2G HTS tapes under very high magnetic field. The coupling is carried out by considering the dependence of the n index and the critical current density Jc on the local relative deformation in addition to the magnetic flux density. The case study is the Little Big Coil (LBC, version 3) which broke the world record of the strongest continuous magnetic field achieved to this date. An analysis of the electromagneto-mechanical behavior of the LBC is conducted on the basis of information extracted from literature to show that the proposed model can assess the current magnitude at which the insert magnet quenched. Additionally, it is shown that the model can also provide some insights on the impact of the mechanical degradation of the tape on the SCIF hysteresis loop. The studies are conducted on the original LBC and on versions that include additional modifications such as harnessing and co- winding with rigid metallic tapes. These modifications are employed to limit the mechanical degradation of the HTS insert magnet under ultra high magnetic field. They are expected to deliver extra safety margin to 2G HTS insert magnets.

Thermal Expansion of Some Fcc Transition Metals

2013 ◽  
Vol 209 ◽  
pp. 48-51
Author(s):  
Priyank Kumar ◽  
Nisarg K. Bhatt ◽  
Pulastya R. Vyas ◽  
Asvin R. Jani ◽  
Vinod B. Gohel
Keyword(s):  
High Pressure ◽  
Thermal Expansion ◽  
Perturbation Theory ◽  
High Temperature ◽  
Transition Metals ◽  
Thermophysical Properties ◽  
Mechanical Model ◽  
Repulsive Potential ◽  
Improved Model ◽  
Model Pseudopotential

Volume thermal expansion of some fcc transition metals have been studied using improved lattice dynamical model. In this approach, the contribution of s like electron is calculated in 2nd order perturbation theory for the local model pseudopotential (Heine - Abrenkov) while that of the d electrons is taken into account by introduction of repulsive potential. The present study confirms that the use of improved model to study such anharmonic property yields satisfactory results. Looking to the success of present study, the present lattice mechanical model may be used to study thermophysical properties in high temperature and high pressure regions.

scholarly journals A hygrothermo-mechanical model for wood: part A. Poroelastic formulation and validation with neutron imaging

Holzforschung ◽  
2015 ◽  
Vol 69 (7) ◽  
pp. 825-837 ◽  
Author(s):  
Saeed Abbasion ◽  
Jan Carmeliet ◽  
Marjan Sedighi Gilani ◽  
Peter Vontobel ◽  
Dominique Derome
Keyword(s):  
High Temperature ◽  
Moisture Content ◽  
Mechanical Model ◽  
Wood Sample ◽  
Industrial Process ◽  
Neutron Imaging ◽  
Correct Prediction ◽  
Environmental Loading ◽  
Wood Part ◽  
Fully Coupled

Abstract The correct prediction of the behavior of wood components undergoing environmental loading or industrial process requires that the hygrothermal and mechanical (HTM) behavior of wood is considered in a coupled manner. A fully coupled poromechanical approach is proposed and validated with neutron imaging measurements of moist wood specimens exposed to high temperature. This paper demonstrates that a coupled HTM approach adequately captures the variations of temperature, moisture content, and dimensions that result in a moist wood sample exposed to one-side heating.

scholarly journals A numerical simulation on coal seam gas recovery from high temperature reservoir

2020 ◽  
Vol 24 (6 Part B) ◽  
pp. 3971-3978
Author(s):  
Teng Teng ◽  
Xiao-Yan Zhu ◽  
Xiang-Yang Zhang ◽  
Peng-Fei Chen ◽  
Yu-Ming Wang ◽  
...  
Keyword(s):  
High Temperature ◽  
Coal Seam ◽  
Mechanical Model ◽  
Gas Flow ◽  
Gas Production ◽  
Coal Seam Gas ◽  
Production Time ◽  
Gas Recovery ◽  
Coal Deformation ◽  
Fully Coupled

The coal seam gas recovery in deep reservoirs often meets high temperature. The change of temperature can greatly influence gas sorption, and couples heat transfer with coal deformation and gas-flow. This paper modifies the conventional Langmuir adsorption equation into a non-isothermal adsorption equation with a set of experimental data. After then, a fully coupled thermo-hydro-mechanical model of coal deformation, gas-flow and heat transfer is established. By using a finite element approach of COMSOL multi-physics, a numerical simulation of coal seam gas recovery from high temperature reservoir is subsequently implemented. The results show that the gas pressure and temperature decrease with production time and increase with the distance from production well, the reservoir permeability decreases with production time due to the compaction of increasing effective stress to coal fracture network, the cumulative gas production increases with production time exponentially whereas the production efficiency decreases negative exponentially, that the gas production in earlier 10 years accounts for 80% of the total production in 30 years. Our fully coupled thermo-hydro-mechanical model can improve the current understanding of coal seam gas recovery from high temperature reservoirs.

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