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C Charbonnel - One of the best experts on this subject based on the ideXlab platform.
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angular momentum transport by internal gravity waves iv wave generation by surface Convection zone from the pre main sequence to the early agb in intermediate mass stars
Astronomy and Astrophysics, 2008Co-Authors: Suzanne Talon, C CharbonnelAbstract:Context. This is the fourth in a series of papers that deal with angular momentum transport by internal gravity waves in stellar interiors. Aims. Here, we want to examine the potential role of waves in other evolutionary phases than the main sequence. Methods. We study the evolution of a $3\,M_\odot$ Population I model from the pre-main sequence to the early-AGB phase and examine whether waves can lead to angular momentum redistribution and/or element diffusion at the External Convection zone boundary. Results. We find that, although waves produced by the surface Convection zone can be ignored safely for such a star during the main sequence, it is not the case for later evolutionary stages. In particular, angular momentum transport by internal waves could be quite important at the end of the sub-giant branch and during the early-AGB phase. Wave-induced mixing of chemicals is expected during the early-AGB phase.
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angular momentum transport by internal gravity waves iv wave generation by surface Convection zone from the pre main sequence to the early agb in intermediate mass stars
arXiv: Astrophysics, 2008Co-Authors: Suzanne Talon, C CharbonnelAbstract:This is the fourth in a series of papers that deal with angular momentum transport by internal gravity waves in stellar interiors. Here, we want to examine the potential role of waves in other evolutionary phases than the main sequence. We study the evolution of a 3Msun Population I model from the pre-main sequence to the early-AGB phase and examine whether waves can lead to angular momentum redistribution and/or element diffusion at the External Convection zone boundary. We find that, although waves produced by the surface Convection zone can be ignored safely for such a star during the main sequence, it is not the case for later evolutionary stages. In particular, angular momentum transport by internal waves could be quite important at the end of the sub-giant branch and during the early-AGB phase. Wave-induced mixing of chemicals is expected during the early-AGB phase.
Suzanne Talon - One of the best experts on this subject based on the ideXlab platform.
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angular momentum transport by internal gravity waves iv wave generation by surface Convection zone from the pre main sequence to the early agb in intermediate mass stars
Astronomy and Astrophysics, 2008Co-Authors: Suzanne Talon, C CharbonnelAbstract:Context. This is the fourth in a series of papers that deal with angular momentum transport by internal gravity waves in stellar interiors. Aims. Here, we want to examine the potential role of waves in other evolutionary phases than the main sequence. Methods. We study the evolution of a $3\,M_\odot$ Population I model from the pre-main sequence to the early-AGB phase and examine whether waves can lead to angular momentum redistribution and/or element diffusion at the External Convection zone boundary. Results. We find that, although waves produced by the surface Convection zone can be ignored safely for such a star during the main sequence, it is not the case for later evolutionary stages. In particular, angular momentum transport by internal waves could be quite important at the end of the sub-giant branch and during the early-AGB phase. Wave-induced mixing of chemicals is expected during the early-AGB phase.
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angular momentum transport by internal gravity waves iv wave generation by surface Convection zone from the pre main sequence to the early agb in intermediate mass stars
arXiv: Astrophysics, 2008Co-Authors: Suzanne Talon, C CharbonnelAbstract:This is the fourth in a series of papers that deal with angular momentum transport by internal gravity waves in stellar interiors. Here, we want to examine the potential role of waves in other evolutionary phases than the main sequence. We study the evolution of a 3Msun Population I model from the pre-main sequence to the early-AGB phase and examine whether waves can lead to angular momentum redistribution and/or element diffusion at the External Convection zone boundary. We find that, although waves produced by the surface Convection zone can be ignored safely for such a star during the main sequence, it is not the case for later evolutionary stages. In particular, angular momentum transport by internal waves could be quite important at the end of the sub-giant branch and during the early-AGB phase. Wave-induced mixing of chemicals is expected during the early-AGB phase.
A Rowe - One of the best experts on this subject based on the ideXlab platform.
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impacts of External heat transfer enhancements on metal hydride storage tanks
International Journal of Hydrogen Energy, 2006Co-Authors: Brendan D Macdonald, A RoweAbstract:The rate at which hydrogen can be drawn from a metal hydride tank is strongly influenced by the rate at which heat can be transferred to the reaction zone. In this work, the impacts of External Convection resistance on thermodynamic behaviour inside the metal hydride tank are examined. A one-dimensional resistive analysis and two-dimensional transient model are used to determine the impact of External fins on the ability of a metal hydride tank to deliver hydrogen at a specified flow rate. For the particular metal hydride alloy (LaNi5) and tank geometry studied, it was found that the fins have a large impact on the pressure of the hydrogen gas within the tank when a periodic hydrogen demand is imposed. Model results suggest that the metal hydride alloy at the centre of the tank can be removed to reduce weight and cost, without detrimental effects to the performance of the system.
Brendan D Macdonald - One of the best experts on this subject based on the ideXlab platform.
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impacts of External heat transfer enhancements on metal hydride storage tanks
International Journal of Hydrogen Energy, 2006Co-Authors: Brendan D Macdonald, A RoweAbstract:The rate at which hydrogen can be drawn from a metal hydride tank is strongly influenced by the rate at which heat can be transferred to the reaction zone. In this work, the impacts of External Convection resistance on thermodynamic behaviour inside the metal hydride tank are examined. A one-dimensional resistive analysis and two-dimensional transient model are used to determine the impact of External fins on the ability of a metal hydride tank to deliver hydrogen at a specified flow rate. For the particular metal hydride alloy (LaNi5) and tank geometry studied, it was found that the fins have a large impact on the pressure of the hydrogen gas within the tank when a periodic hydrogen demand is imposed. Model results suggest that the metal hydride alloy at the centre of the tank can be removed to reduce weight and cost, without detrimental effects to the performance of the system.
Zaoxiao Zhang - One of the best experts on this subject based on the ideXlab platform.
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identifying heat and mass transfer characteristics of metal hydride reactor during adsorption improved formulation about parameter analysis
International Journal of Hydrogen Energy, 2009Co-Authors: Fusheng Yang, Xiangyu Meng, Jianqiang Deng, Yuqi Wang, Zaoxiao ZhangAbstract:Transport process affects the performance of a metal hydride reactor significantly. Therefore in a former paper presented by the same authors, two parameters, which are known as heat transfer controlled reaction rate and mass transfer controlled reaction rate, were defined to account for this effect and assist the design of the reactors. However, a few simplifications were adopted in that article, which may result in some errors. In order to achieve better accuracy and clarity, more factors such as the External Convection heat transfer and propagation of reaction front were considered here in the formulation of the parameters. Then numerical simulations for the adsorption in a tubular reactor were carried out and the situation under which parameter analysis can be applied was discussed. More characteristics in the process were revealed by the newly formulated parameters, which could be seen from the comparison of the results by parameter analysis and numerical simulation.
