scholarly journals Numerical study of heat transfer and chemical kinetics of solar thermochemical reactor for hydrogen production

2018 ◽  
Author(s):  
Achmad Rofi Irsyad ◽  
Byunggi Kim ◽  
Doan Hong Duc ◽  
Saiful Hasmady bin Abu Hassan ◽  
Kazuyoshi Fushinobu
Keyword(s):  
Heat Transfer ◽  
Hydrogen Production ◽  
Chemical Kinetics ◽  
Numerical Study ◽  
Solar Thermochemical ◽  
Kinetics Of

Numerical Study of Nozzle Design on Cadmium Quenching Process in Thermochemical Splitting of Water

2009 ◽  
Author(s):  
Jianhu Nie ◽  
Yitung Chen ◽  
Bunsen Wong ◽  
Lloyd C. Brown
Keyword(s):  
Heat Transfer ◽  
Hydrogen Production ◽  
Gas Flow ◽  
Numerical Study ◽  
Three Dimensional ◽  
Maximum Velocity ◽  
Numerical Results ◽  
Nozzle Design ◽  
Flow And Heat Transfer ◽  
Quenching Process

Three-dimensional liquid-gas flow with condensation during cadmium quenching process for hydrogen production was numerically simulated in order to effectively guide the design of solar decomposer and vapor quencher. The mixture model was selected for modeling the multiphase flow, and the two-equation RNG k-ε model was used to model the turbulent flow and heat transfer. Numerical results including velocity, temperature, pressure, and mole fraction distributions were obtained for different nozzle designs. Numerical results showed that flow is relatively low in the decomposer and close to the bottom and the top inlets. The maximum velocity develops in the region near the entrance of the quenching nozzle as the nozzle angle is small. As the nozzle angle is large, the maximum velocity appears in the exit tube. Temperature, pressure and cadmium vapor distributions are also directly affected by the nozzle angle.

Numerical study of heat transfer and sulfuric acid decomposition in the process of hydrogen production

2019 ◽  
Vol 43 (11) ◽  
pp. 5969-5982 ◽  
Author(s):  
Qi Sun ◽  
Qunxiang Gao ◽  
Ping Zhang ◽  
Wei Peng ◽  
Songzhe Chen ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Sulfuric Acid ◽  
Hydrogen Production ◽  
Numerical Study ◽  
Acid Decomposition ◽  
Sulfuric Acid Decomposition

scholarly journals Thermochemical CO2 splitting via redox cycling of ceria reticulated foam structures with dual-scale porosities

2014 ◽  
Vol 16 (22) ◽  
pp. 10503-10511 ◽  
Author(s):  
Philipp Furler ◽  
Jonathan Scheffe ◽  
Daniel Marxer ◽  
Michal Gorbar ◽  
Alexander Bonk ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Chemical Kinetics ◽  
Radiation Heat Transfer ◽  
Redox Cycling ◽  
Radiation Heat ◽  
Solar Thermochemical ◽  
Dual Scale

Efficient radiation heat transfer and rapid chemical kinetics for solar thermochemical CO2 splitting utilizing dual-scale ceria foam structures.

scholarly journals Numerical study on a new design of solid-fuel ramjet combustor with swirl flow

2019 ◽  
Vol 8 (2) ◽  
pp. 72-79
Author(s):  
Omer Musa ◽  
Chen Xiong ◽  
Guoping Huang
Keyword(s):  
Heat Transfer ◽  
Parallel Computing ◽  
Fluid Mechanics ◽  
Chemical Kinetics ◽  
Solid Fuel ◽  
Numerical Study ◽  
Swirl Flow ◽  
Ramjet Combustor ◽  
Afterburning Chamber ◽  
Transfer Thermodynamics

A new design of solid-fuel ramjet is proposed and examined numerically in this paper. Multi-physics coupling code is developed using FORTRAN and parallel computing to solve the problems of multi-physics coupling of fluid mechanics, solid pyrolysis, heat transfer, thermodynamics, and chemical kinetics. Simulations are carried out for the proposed design then the results are compared with the classic design of the solid-fuel ramjet. It is found that the proposed design has improved the regression rate significantly; besides, the amount of released solid fuel is increased for the same size. A new flame has been observed inside the combustion chamber of the proposed design then the two flamed were emerged in the afterburning chamber.

scholarly journals Review of Heat Transfer Research for Solar Thermochemical Applications

2013 ◽  
Vol 5 (2) ◽  
Author(s):  
W. Lipiński ◽  
J. H. Davidson ◽  
S. Haussener ◽  
J. F. Klausner ◽  
A. M. Mehdizadeh ◽  
...  
Keyword(s):  
Heat Transfer ◽  
High Temperature ◽  
Heterogeneous Media ◽  
Heterogeneous Reactions ◽  
Solar Irradiation ◽  
Challenges And Opportunities ◽  
Mass Transfer Modeling ◽  
Solar Thermochemical ◽  
Kinetics Of

This article reviews the progress, challenges and opportunities in heat transfer research as applied to high-temperature thermochemical systems that use high-flux solar irradiation as the source of process heat. Selected pertinent areas such as radiative spectroscopy and tomography-based heat and mass characterization of heterogeneous media, kinetics of high-temperature heterogeneous reactions, heat and mass transfer modeling of solar thermochemical systems, and thermal measurements in high-temperature systems are presented, with brief discussions of their methods and example results from selected applications.

A Numerical Study of Spark Ignition

2004 ◽  
Author(s):  
O. Ekici ◽  
V. K. Bokka ◽  
O. A. Ezekoye ◽  
R. D. Matthews
Keyword(s):  
Chemical Kinetics ◽  
Numerical Study ◽  
Control Volume ◽  
Theoretical Models ◽  
Spark Discharge ◽  
Physical Models ◽  
Local Thermal Equilibrium ◽  
Energy Equations ◽  
Volume Method ◽  
Kinetics Of

We present theoretical models to simulate spark discharge and ignition. Two models are presented. The first model considers simplified fluid mechanics with chemistry effects. The second model utilizes more sophisticated flow with no chemistry. The simplified model incorporates physical models of breakdown and chemical kinetics of combustion with species and energy equations solved using a control volume method. A three-step mechanism is used to simulate chemical kinetics for fuel combustion and nitrogen chemistry. Dissociation and ionization in the plasma are included by assuming local thermal equilibrium. The second model simulates a spark discharge in air with more complete physics of flow using a high order numerical method, which shows the evolution of the shock wave and a torus-like plasma kernel.

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