The synchronization of the helicity of an instability with azimuthal wavenumber m = 1 by a weak tidal m = 2 perturbation might play a key role in explaining the phase-stable Schwabe cycle of the solar dynamo [1]. To elucidate this type of interaction, we study a thermally driven Rayleigh-Bénard convection under a tide-like influence. We focus first on the generation of the m = 2 mode flow by electromagnetic forcing and then on its low-frequency modulation. In the last section, we present preliminary results on the interaction of this perturbation with the sloshing/torsional motion of the Large Scale Circulation (LSC) of a Rayleigh-Bénard convection flow. While the main focus of the paper is on the numerical side, some comparisons with experimental results are also made. Figs 9, Refs 8.
{"title":"Analyzing a modulated electromagnetic m = 2 forcing and its capability to synchronize the large scale circulation in a Rayleigh-Bénard cell of aspect ratio Γ = 1","authors":"","doi":"10.22364/mhd.58.1-2.20","DOIUrl":"https://doi.org/10.22364/mhd.58.1-2.20","url":null,"abstract":"The synchronization of the helicity of an instability with azimuthal wavenumber m = 1 by a weak tidal m = 2 perturbation might play a key role in explaining the phase-stable Schwabe cycle of the solar dynamo [1]. To elucidate this type of interaction, we study a thermally driven Rayleigh-Bénard convection under a tide-like influence. We focus first on the generation of the m = 2 mode flow by electromagnetic forcing and then on its low-frequency modulation. In the last section, we present preliminary results on the interaction of this perturbation with the sloshing/torsional motion of the Large Scale Circulation (LSC) of a Rayleigh-Bénard convection flow. While the main focus of the paper is on the numerical side, some comparisons with experimental results are also made. Figs 9, Refs 8.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43531859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The time dependent behaviour of the large-scale circulation in a Rayleigh-Bénard convection cell exhibits a rich set of different three-dimensional flow features like rotations or torsional modes. In this paper, the applicability of contactless inductive flow tomography to visualise these flow features in a cylindrical cell filled with GaInSn is investigated numerically. The simulated flow in the cylinder with a diameter of 320 mm and a height of 640 mm serves as a basis to investigate the quality of the reconstructed velocity field by contactless inductive flow tomography. Figs 5, Refs 9.
{"title":"Flow reconstruction in a Rayleigh-Bénard convection cell with an aspect ratio 0.5 by contactless inductive flow tomography","authors":"","doi":"10.22364/mhd.58.1-2.8","DOIUrl":"https://doi.org/10.22364/mhd.58.1-2.8","url":null,"abstract":"The time dependent behaviour of the large-scale circulation in a Rayleigh-Bénard convection cell exhibits a rich set of different three-dimensional flow features like rotations or torsional modes. In this paper, the applicability of contactless inductive flow tomography to visualise these flow features in a cylindrical cell filled with GaInSn is investigated numerically. The simulated flow in the cylinder with a diameter of 320 mm and a height of 640 mm serves as a basis to investigate the quality of the reconstructed velocity field by contactless inductive flow tomography. Figs 5, Refs 9.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43462875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ke Liu, F. Stefani, N. Weber, T. Weier, Ben-Wen Li
The mechanical behaviour of the oxide film that develops at the metal-air interface of molten A356 aluminum alloy is investigated in relation to the oxidation level. Based on two previous papers - the first one focusing on the chemical aspects of the oxidation process at the liquid surface of molten aluminum, the second one focusing on its mechanical characterization, the present paper aims at reconciling these two approaches usually considered separately in the literature and proposes a stand-alone mechano-chemical model. The oxidation process is first characterized from thermogravimetric analyses together with scanning electron microscopy imaging. Then the mechanical properties of the oxide layer are determined at a given oxidation level, making use of a new annular MHD surface viscometer placed inside a chemical reactor. The kinetic study delivers a better understanding of the oxidation process involved at the surface of the A356 alloy and leads to the development of a revised version of the Deal−Grove model. In addition, the mechanical study reveals the highly viscous and shear-thinning behaviours of the oxide layer. Figs 3, Refs 14.
{"title":"Transient behaviour of electrovortex flow in a cylindrical container","authors":"Ke Liu, F. Stefani, N. Weber, T. Weier, Ben-Wen Li","doi":"10.22364/mhd.57.4.2","DOIUrl":"https://doi.org/10.22364/mhd.57.4.2","url":null,"abstract":"The mechanical behaviour of the oxide film that develops at the metal-air interface of molten A356 aluminum alloy is investigated in relation to the oxidation level. Based on two previous papers - the first one focusing on the chemical aspects of the oxidation process at the liquid surface of molten aluminum, the second one focusing on its mechanical characterization, the present paper aims at reconciling these two approaches usually considered separately in the literature and proposes a stand-alone mechano-chemical model. The oxidation process is first characterized from thermogravimetric analyses together with scanning electron microscopy imaging. Then the mechanical properties of the oxide layer are determined at a given oxidation level, making use of a new annular MHD surface viscometer placed inside a chemical reactor. The kinetic study delivers a better understanding of the oxidation process involved at the surface of the A356 alloy and leads to the development of a revised version of the Deal−Grove model. In addition, the mechanical study reveals the highly viscous and shear-thinning behaviours of the oxide layer. Figs 3, Refs 14.","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41819458","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Performance analysis of an inert gas plasma Faraday-type MHD generator by coupling thermodynamic equilibrium ionization model with UDF functions of Fluent","authors":"","doi":"10.22364/mhd.57.4.8","DOIUrl":"https://doi.org/10.22364/mhd.57.4.8","url":null,"abstract":"","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45117413","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Numerical analysis of angular effect on liquid silicon flow in the MHD Graëtz heat exchanger","authors":"","doi":"10.22364/mhd.57.4.7","DOIUrl":"https://doi.org/10.22364/mhd.57.4.7","url":null,"abstract":"","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49105522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of longitudinal magnetic field on the droplet evolution during electroslag remelting","authors":"","doi":"10.22364/mhd.57.4.10","DOIUrl":"https://doi.org/10.22364/mhd.57.4.10","url":null,"abstract":"","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48484492","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"MHD Casson fluid flow under the temperature and concentration gradients","authors":"","doi":"10.22364/mhd.57.3.5","DOIUrl":"https://doi.org/10.22364/mhd.57.3.5","url":null,"abstract":"","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48956292","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Nurzatulshima Kamaruddin, A. F. Ayub, Sharifah Kartini, Said Husain
{"title":"The impact of Newtonian heating on magnetic Casson nanofluid flow with variable consistency over a variable surface thickness","authors":"Nurzatulshima Kamaruddin, A. F. Ayub, Sharifah Kartini, Said Husain","doi":"10.22364/mhd.57.3.1","DOIUrl":"https://doi.org/10.22364/mhd.57.3.1","url":null,"abstract":"","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43165152","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Soret--Dufour impacts on inclined magnetic Casson fluid flow","authors":"","doi":"10.22364/mhd.57.3.4","DOIUrl":"https://doi.org/10.22364/mhd.57.3.4","url":null,"abstract":"","PeriodicalId":18136,"journal":{"name":"Magnetohydrodynamics","volume":" ","pages":""},"PeriodicalIF":0.7,"publicationDate":"2021-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46531417","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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