Three-dimensional modeling and sensitivity analysis of multi-tubular metal hydride reactors

Bao, Zewei; Wu, Zhen; Nyamsi, Serge Nyallang; Yang, Fusheng; Zhang, Zaoxiao

doi:10.1016/j.applthermaleng.2012.11.023

Cited by 85 publications

(25 citation statements)

References 28 publications

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“…The model is similar to models used by other authors [see, e. g. 11,12], but unlike those models, it takes into account the presence of unabsorbed gas in the gaseous phase. This is important because effective thermal conductivity strongly depends on the composition of the gas mixture.…”

Section: Mathematical Modelmentioning

confidence: 96%

Numerical study of hydrogen purification using metal hydride reactor with aluminium foam

Минко

Артемов

Yan’kov

2015

Applied Thermal Engineering

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Section: Mathematical Modelmentioning

confidence: 96%

Numerical study of hydrogen purification using metal hydride reactor with aluminium foam

Минко

Артемов

Yan’kov

2015

Applied Thermal Engineering

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“…In most studies, an adiabatic boundary condition is applied at the wall of the hydrogen injection tube [18], [21]. However, an analysis conducted by Na Ranong et al [22] revealed that applying such a boundary condition is not appropriate since it does not predict the cooling effect of the inlet hydrogen on the loading behavior.…”

Section: Initial and Boundary Conditionsmentioning

confidence: 99%

Numerical investigation of hydrogen charging performance for a combination reactor with embedded metal hydride and coolant tubes

Bhouri

Bürger

Linder

2015

International Journal of Hydrogen Energy

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A two-dimensional model investigating the hydrogen charging process in a combination reactor filled with both LaNi 4.3 Al 0.4 Mn 0.3 and 2LiNH 2 -1.1MgH 2 -0.1LiBH 4 -3wt.%ZrCoH 3 materials has been developed. The selected configuration is a cylindrical reactor of 32 cm of diameter where the MeH is filled in annular tubes separated from the complex hydride bed by a gas permeable layer. The diffusion of hydrogen towards the two storage media is ensured by filters embedded in the middle of the MeH tubes whereas the coolant tubes are placed in the centre of their triangular arrangement. Simulation results have shown that the charging process depends on the MeH reaction heat required for the initiation of the CxH reaction as well as the heat management once the complex hydride starts to store hydrogen. High hydrogen storage rates and short refueling times can be obtained by increasing the number of MeH and coolant tubes and ensuring an efficient heat removal at the peripheral area of the CxH media. A refueling time of 3 min is achieved for an optimum configuration of 49 MeH tubes and 96 coolant tubes while increasing the thermal conductivity of the CxH media to 3.5 W/(m K). Such a result could make the identified optimum configuration as a suitable hydrogen storage system for fuel cell forklift trucks since it meets the requirements of this application in terms of weight and size.

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“…The absorption rate constant (Ca) varies from 0.03 to 175.07 s -1 and the activation energy (Ea) varies between 13 000 and 49 674 J mol -1 . As for the thermal conductivity of the metal and the porosity, their variations range between 0.524 and 3.18 W m -1 K -1 and 0.3 to 0.63 respectively [2,15,16,22,[30][31][32][33][34][35]. In the last two cases (k m and ε) it has been considered that the range of variation of the parameters is small and the simulation results are not drastically affected by the selected value of these parameters, so the ones used in Table 1 are kept.…”

Section: Sensitivity Of the Model To Cooling Levelmentioning

confidence: 99%

“…Under the assumptions above, the metal hydride container is governed by the conservation of mass, momentum and thermal energy [17,[20][21][22][23].…”

Section: Conservation Equations and Source Termsmentioning

confidence: 99%

Effect of metal hydride properties in hydrogen absorption through 2D-axisymmetric modeling and experimental testing in storage canisters

Busqué

Torres²,

Grau³

et al. 2017

International Journal of Hydrogen Energy

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A two-dimensional axisymmetric model is developed to study the hydrogen absorption reaction and resultant mass and heat transport phenomena inside a metal hydride canister. The model is compared against published literature and experimental data. Experimental tests are performed on an in-house fabricated setup using different cooling scenarios. An extensive study on the effects of the metal properties on charging performance is carried out through nondestructive testing (NDT). Results show that the properties that most influence the charging performance are: absorption rate constant (Ca), activation energy (Ea) and thermal conductivity (k m ). A Higher porosity (ε) reduces charging time and amount of hydrogen stored while a higher cooling level produces a faster charging process. These results can be used to select metal hydride materials but also to estimate the metal hydride internal state and the process can be used for future evaluation of metal hydride degradation.

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Three-dimensional modeling and sensitivity analysis of multi-tubular metal hydride reactors

Cited by 85 publications

References 28 publications

Numerical study of hydrogen purification using metal hydride reactor with aluminium foam

Numerical study of hydrogen purification using metal hydride reactor with aluminium foam

Numerical investigation of hydrogen charging performance for a combination reactor with embedded metal hydride and coolant tubes

Effect of metal hydride properties in hydrogen absorption through 2D-axisymmetric modeling and experimental testing in storage canisters

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