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The Effect of Static Magnetic Field on the Channel Formation during Directional Solidification of Aqueous Ammonium Chloride Solution
Author(s) -
Ding Biao,
Zhou Tao,
Ren Weili,
Zhong Yunbo,
Yu Jianbo,
Ren Zhongming,
Li Fei
Publication year - 2018
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201800113
Subject(s) - aqueous solution , magnetic field , convection , ammonium chloride , directional solidification , chloride , channel (broadcasting) , magnetohydrodynamics , materials science , field (mathematics) , chemistry , temperature gradient , concentration gradient , condensed matter physics , chemical physics , analytical chemistry (journal) , mechanics , composite material , metallurgy , physics , chromatography , meteorology , microstructure , electrical engineering , mathematics , quantum mechanics , pure mathematics , engineering
This study investigates the effect of magnetic field on the channel formation by using a 27 wt.% aqueous ammonium chloride solution at an initial base temperature of 246 K (−27 °C) under magnetic fields of 0.03T, 0.05T, and 0.1T. The application of a magnetic field suppresses channel formation, as reflected by the delayed occurrence, the decreased number and density of channels, and the increased areas with no channels and mushy‐zone height necessary to form channels. The suppression of channel formation is caused by the magneto‐hydrodynamic (MHD) effect on convection during directional solidification. The higher temperature gradient in the mushy zone under an applied magnetic field further confirms the mechanism. The present investigation would help to provide useful predictions for the influence of magnetic field on channel formation during the directional solidification of alloys.