Experimental and Numerical Evaluation of the By-Pass Flow in a Catalytic Plate Reactor for Hydrogen Production

2011 ◽  
Author(s):  
Haftor O. Sigurdsson ◽  
So̸ren K. Kær
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Steam Reforming ◽  
Numerical Evaluation ◽  
Flow Resistance ◽  
Hydrogen Generation ◽  
Wire Mesh ◽  
Coated Wire ◽  
Flow Maldistribution ◽  
Good Agreement

Numerical and experimental study is performed to evaluate the reactant by-pass flow in a catalytic plate reactor with a coated wire mesh catalyst for steam reforming of methane for hydrogen generation. By-pass of unconverted methane is evaluated under different wire mesh catalyst width to reactor duct width ratios, the results show that altering this ratio from 0.98 to 0.96 results in an increase in by-pass mass flow of 22%. Effect of catalytic wire mesh flow resistance on by-pass flow has also been investigated and results show increased by-pass flow as catalytic wire mesh flow resistance increases. The numerical results are in good agreement with experimental data. The study improves the understanding of the underlying transport phenomena in these reactors and shows that the flow maldistribution in a catalytic plate reactor using a coated wire mesh has to be considered.

Experimental and Numerical Evaluation of the Bypass Flow in a Catalytic Plate Reactor for Hydrogen Production

2012 ◽  
Vol 9 (2) ◽  
Author(s):  
Haftor O. Sigurdsson ◽  
Søren K. Kær
Keyword(s):  
Experimental Data ◽  
Steam Reforming ◽  
Numerical Evaluation ◽  
Flow Resistance ◽  
Hydrogen Generation ◽  
Wire Mesh ◽  
Bypass Flow ◽  
Coated Wire ◽  
Flow Maldistribution ◽  
Good Agreement

Numerical and experimental study is performed to evaluate the reactant bypass flow in a catalytic plate reactor with a coated wire mesh catalyst for steam reforming of methane for hydrogen generation. Bypass of unconverted methane is evaluated under different wire mesh catalyst width to reactor duct width ratios, the results show that altering this ratio from 0.98 to 0.96 results in an increase in bypass mass flow of 22%. Effect of catalytic wire mesh flow resistance on bypass flow has also been investigated and results show increased bypass flow as catalytic wire mesh flow resistance increases. The numerical results are in good agreement with experimental data. The study improves the understanding of the underlying transport phenomena in these reactors and shows that the flow maldistribution in a catalytic plate reactor using a coated wire mesh has to be considered.

Induction Electrohydrodynamic Pump in a Vertical Configuration: Part 2—Experimental Study

1989 ◽  
Vol 111 (3) ◽  
pp. 670-674 ◽  
Author(s):  
J. Seyed-Yagoobi ◽  
J. C. Chato ◽  
J. M. Crowley ◽  
P. T. Krein
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Theoretical Model ◽  
Natural Circulation ◽  
External Pressure ◽  
Temperature Profiles ◽  
Flow Rates ◽  
Present Apparatus ◽  
Circulation Velocity ◽  
Good Agreement

An induction electrohydrodynamic (EHD) pump in axisymmetric, vertical configuration was designed and built. The flow rates were measured for various temperature profiles and several values of frequency, voltage, wavelength, and electric conductivity. The experimental data are generally in good agreement with the theoretical model presented in Part 1. With the present apparatus at relatively low voltages, velocities four times higher than natural circulation velocity are easily obtained. The external pressure load and entrance temperature profile play important roles on the operation of the pump and must be considered carefully in the design.

scholarly journals Added Mass and Damping of a Vibrating Rod in Confined Viscous Fluids

1976 ◽  
Vol 43 (2) ◽  
pp. 325-329 ◽  
Author(s):  
S. S. Chen ◽  
M. W. Wambsganss ◽  
J. A. Jendrzejczyk
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Cylindrical Shell ◽  
Closed Form Solution ◽  
Added Mass ◽  
Form Solution ◽  
Viscous Fluids ◽  
Series Of Experiments ◽  
Theoretical Results ◽  
Good Agreement

This paper presents an analytical and experimental study of a cylindrical rod vibrating in a viscous fluid enclosed by a rigid, concentric cylindrical shell. A closed-form solution for the added mass and damping coefficient is obtained and a series of experiments with cantilevered rods vibrating in various viscous fluids is performed. Experimental data and theoretical results are in good agreement.

Experimental Study of Spring Wire Enhancement of Air Heat Transfer inside TIEC Tubes

2012 ◽  
Vol 446-449 ◽  
pp. 2884-2887
Author(s):  
Yu Gang Wang ◽  
Jia Ping Liu ◽  
Huang Xiang ◽  
Shao Hui Yang
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Experimental Study ◽  
Regression Analysis ◽  
Heat Transfer Enhancement ◽  
Flow Resistance ◽  
Transfer Enhancement ◽  
Spring Wire ◽  
Experimental Correlation ◽  
Performance Of Heat Transfer

This paper proposes the method of the fresh air heat transfer enhancement through insert Spiral in the tube of TIEC, and researches the heat transfer enhancement and Flow resistance characteristics through experiment when the Re is 6270 - 11016 range. Through regression analysis of the experimental data, obtained the experimental correlation of the heat transfer and drag coefficient of the strengthen tube, at the same time, evaluate the performance of heat transfer enhancement using appropriate method, and give some exploratory analysis.

scholarly journals Simulation and experimental study of novel cascade solar still

2021 ◽  
Vol 297 ◽  
pp. 01002
Author(s):  
Nidal Mouhsin ◽  
Mariam Bouzaid ◽  
Mourad Taha-Janan ◽  
Mohamed Oubrek
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Solar Still ◽  
Absorber Plate ◽  
Ansys Fluent ◽  
Climate Conditions ◽  
Fluent Software ◽  
Simulation Results ◽  
Good Agreement

In this paper, a new design of inclined solar still with steppe absorber plate, slope surfaces and baffles were proposed, fabricated, tested and modeled using ANSYS FLUENT software, in order to develop the simple and the cheapest type of desalination. The simulation has been carried out and validated with experimental data for climate conditions of Rabat-Morocco (34°47’N) obtained from our existing prototype. It has been found that the simulation results are in good agreement with the experimental data. It was also examined that the productivity of the cascade Solar Still was higher from 12:00 to 15:00 hrs. The results indicate that the new design ensures higher productivity.

scholarly journals TO THE PROBLEM OF DETERMINING THE COEFFICIENT OF THERMAL EXPANSION OF MATERIALS

2020 ◽  
pp. 284-292
Author(s):  
Денис Васильевич Пьянзин ◽  
Николай Александрович Панькин ◽  
Александр Николаевич Чалдышкин ◽  
Николай Иванович Чистяков
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Computer Simulation ◽  
Thermal Expansion ◽  
Software Package ◽  
Coefficient Of Thermal Expansion ◽  
Metallic Materials ◽  
Ansys Software ◽  
Simulation Results ◽  
Good Agreement

Проведено экспериментальное исследование и компьютерное моделирование в программном комплексе ANSYS термического воздействия на металлический материал. Отмечается уменьшение значений коэффициента теплового расширения при увеличении скорости нагрева образца. Показано, что данное поведение обусловлено наличием градиента температур между его центральной и поверхностью частями. Отмечается хорошее согласие результатов компьютерного моделирования с соответствующими экспериментальными данными. Значения коэффициента теплового расширения близки к истинным, которые были определены при малых скоростях нагрева/охлаждения или при длительной выдержке образца при конечной и начальной температурах. Результаты моделирования в ANSYS могут быть использованы при интерпретации и прогнозировании тепловых свойств металлических материалов. An experimental study and computer modeling in the ANSYS software package of the thermal effect on a metal material was carried out. A decrease in the values of the coefficient of the thermal expansion is noted with an increase in the heating rate of the sample. It is shown that this behavior is due to the presence of the temperature gradient between its central and surface parts. Good agreement of the results of computer simulation with the corresponding experimental data is found. The values of the coefficient of thermal expansion are close to true ones determined at low heating / cooling rates or with long exposure of the sample at the final and initial temperatures. The simulation results in ANSYS can be used to interpret and predict thermal properties of metallic materials.

Prediction of Darcy Permeability and Forchheimer’s Coefficient of Porous Structures Relevant to Regenerator of a Stirling Cryocooler Using a Correlation Based Method

2017 ◽  
Vol 25 (02) ◽  
pp. 1750014
Author(s):  
V. V. Kishor Kumar ◽  
Biju T. Kuzhiveli
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Porous Media ◽  
Pressure Drop ◽  
Friction Factor ◽  
Steady Flow ◽  
Wire Mesh ◽  
Pressure Amplitude ◽  
Regenerative Heat ◽  
Inertial Coefficient

A regenerative heat exchanger is the most vital component in the design of a Stirling cryocooler. Computational Fluid Dynamics (CFD) is the best technique for the design and prediction of the performance of a regenerator. The reliability of the simulation results depend on the accuracy of the Darcy permeability [Formula: see text] and Forchheimer’s inertial coefficient [Formula: see text] used for modeling the momentum transfer in porous media. Usually these coefficients are calculated from pressure drop data obtained from experiment. Because of the requirement of sophisticated equipments for the measurement and analysis of data, experimental study becomes expensive. This paper proposes a friction factor correlation-based method for the prediction of directional permeability and Forchheimer’s inertial coefficient of wire mesh structures relevant to Stirling cryocooler. The friction factor for the flow of helium through #325, #400 and #635 SS wire matrices with porosities of 0.6969, 0.6969 and 0.6312 are calculated using standard correlations and compared with the friction factor given by Clearman et al. based on steady flow experimental study. The friction factor obtained from Blass and Tong/London correlations are in agreement with that of Clearman et al. The viscous and inertial resistances are calculated from the friction factor obtained from Blass and Tong/London correlations. Using these values, the regenerator was modeled as a porous media in Fluent. From the steady flow simulation, pressure drop at different mass flow rates (0.08–1.44[Formula: see text]g/s) is obtained. The maximum deviation of predicted pressure drop from the reported experimental data is 15.14%. The Darcy permeability [Formula: see text] and Forchheimer’s inertial coefficient [Formula: see text] obtained from correlation-based method was used for modeling the oscillatory flow of helium through a #400 regenerator. The pressure amplitude and phase at regenerator exit were obtained at different frequencies. The average deviation of predicted pressure amplitude from the experimental data is 15.83%. The model could predict the phase angle also accurately. Therefore, the proposed method can be used to calculate the hydrodynamic parameters of woven wire screen matrices applied to Stirling cryocoolers.

A New Method to Estimate Ductility of L-Shaped CFT Columns with Binding Bars under Axial Compression

2012 ◽  
Vol 594-597 ◽  
pp. 828-831
Author(s):  
Yue Ling Long ◽  
Jian Cai
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Axial Compression ◽  
Material Properties ◽  
New Method ◽  
Steel Columns ◽  
Good Agreement

Ductility of six L-shaped concrete-filled steel columns with binding bars and one without binding bars were discussed based on the experimental study. A new method based on material properties instead of experimental data was proposed to estimate the ductility of six L-shaped concrete-filled steel columns with binding bars and one without binding bars. Comparison between ductility coefficients based on experimental data and the calculated values by the proposed method shows good agreement.

Energy Levels and Electromagnetic Transition of 90-94mo Nuclei Using Ibm-1

2020 ◽  
pp. 149-152
Keyword(s):  
Experimental Data ◽  
Transition Probability ◽  
Energy Levels ◽  
Dynamical Symmetry ◽  
Interacting Boson Model ◽  
Excitation Energies ◽  
Electromagnetic Transition ◽  
Boson Model ◽  
Energy States ◽  
Good Agreement

The energy states for the J , b , ɤ bands and electromagnetic transitions B (E2) values for even – even molybdenum 90 – 94 Mo nuclei are calculated in the present work of "the interacting boson model (IBM-1)" . The parameters of the equation of IBM-1 Hamiltonian are determined which yield the best excellent suit the experimental energy states . The positive parity of energy states are obtained by using IBS1. for program for even 90 – 94 Mo isotopes with bosons number 5 , 4 and 5 respectively. The" reduced transition probability B(E2)" of these neuclei are calculated and compared with the experimental data . The ratio of the excitation energies of the 41+ to 21+ states ( R4/2) are also calculated . The calculated and experimental (R4/2) values showed that the 90 – 94 Mo nuclei have the vibrational dynamical symmetry U(5). Good agreement was found from comparison between the calculated energy states and electric quadruple probabilities B(E2) transition of the 90–94Mo isotopes with the experimental data .

EXPERIMENTAL STUDY OF THE KINEMATIC PARAMETERS OF MOVEMENT OF CARS FORCED IDLE MOTION

2018 ◽  
pp. 52-57
Author(s):  
Ivelin Kostov
Keyword(s):  
Experimental Data ◽  
Experimental Study ◽  
Experimental Research ◽  
Kinematic Parameters ◽  
Research Results ◽  
Software Product

In the work brought some experimental data of kinematic parameters of movement of cars forced idle, as the software product was used to diagnose 900 ATS, which recorded kinematic parameters of vehicle. On the basis of the conducted experimental research results are shown tabulated and analysed.

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