Husaen Salahu - Profile on Academia.edu (original) (raw)

Papers by Husaen Salahu

Statistical Approach to Quality Control of Large Thermodynamic Databases

… Materials Transactions B, 2012

ABSTRACT

Tectonophysics, 2005

Recent estimates of the heat flux from the oceanic crust rest on the validity and accuracy of the... more Recent estimates of the heat flux from the oceanic crust rest on the validity and accuracy of the half-space cooling (HSC) model. The known discrepancies between calculated and measured heat fluxes are not due to hydrothermal circulation, as commonly assumed, because the magmatic source provides too little energy, and the Rayleigh number is too small to foster vigorous convection on an oceanic scale. The half-space cooling model errs in assuming constant thermal conductivity (k), but more importantly, provides infinite flux along the ridge centers over all time for any form for k. This unrealistic global singularity strongly impacts the derived mean flux. We develop three independent methods to ascertain Earth's mean oceanic heat flux directly from compiled heat flow data. The results are congruent, insensitive to uncertainties in the dataset, corroborate previous spherical harmonic analyses, provide the same average flux as from the continents, and constrain the global power as 31F1 TW. Geological observations, inferred mantle overturn rates, estimated mantle cooling rates, and recent geodynamic models independently suggest that neither delayed secular cooling nor primordal heat are currently significant sources, necessitating that current heat production predominately originates in radioactive decay and is quasi-steady-state. Models of Earth's bulk composition based on CI chondritic meteorites provide an unrealistically low radioactive power of~20 TW, whereas enstatite chondrites are sufficiently radioactive to supply the observed heat flux, contain enough iron metal to account for Earth's huge core, and have the same oxygen isotopic ratios as the bulk Earth. We devise a method to obtain K/U/Th ratios for the Earth and other planetary bodies from their power, including secular delays, and use this to constrain Earth's cooling rate. D

CO capture properties of alkaline earth metal oxides and hydroxides: A combined density functional theory and lattice phonon dynamics study

The Journal of chemical physics, 2010

Fuel and Energy Abstracts, 2011

The article explores the thermodynamics of an alternate hydrogen generation process – dry autothe... more The article explores the thermodynamics of an alternate hydrogen generation process – dry autothermal reforming and its comparison to autothermal reforming process of isooctane for use in gasoline fuel processors for SOFC. A thermodynamic analysis of isooctane as feed hydrocarbon for autothermal reforming and dry autothermal reforming processes for feed OCIR (oxygen to carbon in isooctane ratio) from 0.5 to 0.7 at 1 bar pressure under analogous thermoneutral operating conditions was done using Gibbs free energy minimization algorithm in HSC Chemistry. The trends in thermoneutral points (TNP), important product gas compositions at TNPs and fuel processor energy requirements were compared and analyzed. Dry autothermal reforming was identified as a less energy consuming alternative to autothermal reforming as the syngas can be produced with lower energy requirements at thermoneutral temperatures, making it a promising candidate for use in gasoline fuel processors to power the solid oxide fuel cells. The dry autothermal reforming process for syngas production can also be used for different fuels.

Preprints of the 18th IFAC World …, 2011

This paper presents a novel simulation concept for operator training in the field of mineral proc... more This paper presents a novel simulation concept for operator training in the field of mineral processing. The simulations are carried out with a dynamic process simulator HSC Sim ® of HSC Chemistry ® developed by Outotec Research Oy. The simulator is fitted to mimic an existing copper flotation circuit as accurately as possible by using metallurgical models and then integrated into a larger simulation environment, providing the operator trainees a realistic experience of the process. The simulation environment is designed to be scalable and very flexible, allowing many different usage scenarios and thus aiding in the transfer of the tacit knowledge from operator generation to the next. Concurrent work is being done on higher level analysis, utilizing the results reported in this paper.

Study on the oxidizing reaction of rare-earth chlorides (CeCl 3 and PrCl 3 ) in LiCl-KCI eutectic salt by O 2 injection

Journal of Radioanalytical and Nuclear Chemistry, 2007

The oxidizing reaction of some rare-earth chlorides (Pr/CeCl3) in an eutectic (LiCl-KCl) salt was... more The oxidizing reaction of some rare-earth chlorides (Pr/CeCl3) in an eutectic (LiCl-KCl) salt was studied by O2 injection. In this study, oxychlorides (REOCl) or oxides (REO2) were formed as reaction products. The results conformed to the thermodynamic equilibrium data calculated by HSC-Chemistry 5.1 software. The conversion ratio of the rare-earth chlorides to insoluble precipitates was over 0.999, after injecting O2 for 7 hours at 650 °C for the eutectic salt temperature.

International Journal of Hydrogen Energy, 2008

This paper investigated the production of hydrogen from methane under atmospheric pressure using ... more This paper investigated the production of hydrogen from methane under atmospheric pressure using a plasma-catalyst hybrid converter with emphasis on energy conservation.

HSC Chemistry 7 Simulation

Slag remelt purification of irradiated vanadium alloys

This paper describes theoretical and scoping experimental efforts to investigate the decontaminat... more This paper describes theoretical and scoping experimental efforts to investigate the decontamination potential of a slag remelting process for decontaminating irradiated vanadium alloys. Theoretical calculations, using a commercial thermochemical computer code HSC Chemistry, determined the potential slag compositions and slag-vanadium alloy ratios. The experiment determined the removal characteristics of four surrogate transmutation isotopes (Ca, Y - to simulate Sc, Mn,

Statistical Approach to Quality Control of Large Thermodynamic Databases

… Materials Transactions B, 2012

ABSTRACT

Tectonophysics, 2005

Recent estimates of the heat flux from the oceanic crust rest on the validity and accuracy of the... more Recent estimates of the heat flux from the oceanic crust rest on the validity and accuracy of the half-space cooling (HSC) model. The known discrepancies between calculated and measured heat fluxes are not due to hydrothermal circulation, as commonly assumed, because the magmatic source provides too little energy, and the Rayleigh number is too small to foster vigorous convection on an oceanic scale. The half-space cooling model errs in assuming constant thermal conductivity (k), but more importantly, provides infinite flux along the ridge centers over all time for any form for k. This unrealistic global singularity strongly impacts the derived mean flux. We develop three independent methods to ascertain Earth's mean oceanic heat flux directly from compiled heat flow data. The results are congruent, insensitive to uncertainties in the dataset, corroborate previous spherical harmonic analyses, provide the same average flux as from the continents, and constrain the global power as 31F1 TW. Geological observations, inferred mantle overturn rates, estimated mantle cooling rates, and recent geodynamic models independently suggest that neither delayed secular cooling nor primordal heat are currently significant sources, necessitating that current heat production predominately originates in radioactive decay and is quasi-steady-state. Models of Earth's bulk composition based on CI chondritic meteorites provide an unrealistically low radioactive power of~20 TW, whereas enstatite chondrites are sufficiently radioactive to supply the observed heat flux, contain enough iron metal to account for Earth's huge core, and have the same oxygen isotopic ratios as the bulk Earth. We devise a method to obtain K/U/Th ratios for the Earth and other planetary bodies from their power, including secular delays, and use this to constrain Earth's cooling rate. D

CO capture properties of alkaline earth metal oxides and hydroxides: A combined density functional theory and lattice phonon dynamics study

The Journal of chemical physics, 2010

Fuel and Energy Abstracts, 2011

The article explores the thermodynamics of an alternate hydrogen generation process – dry autothe... more The article explores the thermodynamics of an alternate hydrogen generation process – dry autothermal reforming and its comparison to autothermal reforming process of isooctane for use in gasoline fuel processors for SOFC. A thermodynamic analysis of isooctane as feed hydrocarbon for autothermal reforming and dry autothermal reforming processes for feed OCIR (oxygen to carbon in isooctane ratio) from 0.5 to 0.7 at 1 bar pressure under analogous thermoneutral operating conditions was done using Gibbs free energy minimization algorithm in HSC Chemistry. The trends in thermoneutral points (TNP), important product gas compositions at TNPs and fuel processor energy requirements were compared and analyzed. Dry autothermal reforming was identified as a less energy consuming alternative to autothermal reforming as the syngas can be produced with lower energy requirements at thermoneutral temperatures, making it a promising candidate for use in gasoline fuel processors to power the solid oxide fuel cells. The dry autothermal reforming process for syngas production can also be used for different fuels.

Preprints of the 18th IFAC World …, 2011

This paper presents a novel simulation concept for operator training in the field of mineral proc... more This paper presents a novel simulation concept for operator training in the field of mineral processing. The simulations are carried out with a dynamic process simulator HSC Sim ® of HSC Chemistry ® developed by Outotec Research Oy. The simulator is fitted to mimic an existing copper flotation circuit as accurately as possible by using metallurgical models and then integrated into a larger simulation environment, providing the operator trainees a realistic experience of the process. The simulation environment is designed to be scalable and very flexible, allowing many different usage scenarios and thus aiding in the transfer of the tacit knowledge from operator generation to the next. Concurrent work is being done on higher level analysis, utilizing the results reported in this paper.

Study on the oxidizing reaction of rare-earth chlorides (CeCl 3 and PrCl 3 ) in LiCl-KCI eutectic salt by O 2 injection

Journal of Radioanalytical and Nuclear Chemistry, 2007

The oxidizing reaction of some rare-earth chlorides (Pr/CeCl3) in an eutectic (LiCl-KCl) salt was... more The oxidizing reaction of some rare-earth chlorides (Pr/CeCl3) in an eutectic (LiCl-KCl) salt was studied by O2 injection. In this study, oxychlorides (REOCl) or oxides (REO2) were formed as reaction products. The results conformed to the thermodynamic equilibrium data calculated by HSC-Chemistry 5.1 software. The conversion ratio of the rare-earth chlorides to insoluble precipitates was over 0.999, after injecting O2 for 7 hours at 650 °C for the eutectic salt temperature.

International Journal of Hydrogen Energy, 2008

This paper investigated the production of hydrogen from methane under atmospheric pressure using ... more This paper investigated the production of hydrogen from methane under atmospheric pressure using a plasma-catalyst hybrid converter with emphasis on energy conservation.

HSC Chemistry 7 Simulation

Slag remelt purification of irradiated vanadium alloys

This paper describes theoretical and scoping experimental efforts to investigate the decontaminat... more This paper describes theoretical and scoping experimental efforts to investigate the decontamination potential of a slag remelting process for decontaminating irradiated vanadium alloys. Theoretical calculations, using a commercial thermochemical computer code HSC Chemistry, determined the potential slag compositions and slag-vanadium alloy ratios. The experiment determined the removal characteristics of four surrogate transmutation isotopes (Ca, Y - to simulate Sc, Mn,