Determining the critical Reynolds number for suppressing Marangoni convection of alumina in silicate melt
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In: Ceramics International : CI, Vol. 50.2024, No. 11 Part A, 29.02.2024, p. 18323-18328.
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TY - JOUR
T1 - Determining the critical Reynolds number for suppressing Marangoni convection of alumina in silicate melt
AU - Burhanuddin, Burhanuddin
AU - Harmuth, Harald
AU - Vollmann, Sandra
N1 - Publisher Copyright: © 2024 Elsevier Ltd and Techna Group S.r.l.
PY - 2024/2/29
Y1 - 2024/2/29
N2 - Ceramic dissolution within silicate melts is often caused by Marangoni convection arising from surface tension gradients, unless it is counteracted by forced convection, which typically occurs beyond a specific critical Reynolds number (〖Re〗_c). This study presents a method for determining the 〖Re〗_c required to suppress Marangoni convection at the alumina (Al2O3)/slag/air triple point. This approach utilizes a modified finger test device equipped with a high-resolution laser for dimensional measurement, allowing accurate determination of mass flux densities from the grove and mantle separately. Subsequently, we examined the dissolution of Al2O3 fine ceramics in a quaternary silicate melt of calcium oxide (CaO)–Al2O3–silicon dioxide (SiO2)–MgO (or magnesium oxide), featuring a CaO/SiO2 weight ratio of 0.65. The experiments were conducted at 1550 °C for speeds of 0, 50, 100, and 200 rpm. The findings revealed a critical rotational speed of 127 rpm for Al2O3-dissolution in this silicate slag at 1550 °C using the aforementioned device, corresponding to an 〖Re〗_c of 6.46. These results contribute to a deeper understanding of the factors influencing ceramic dissolution in silicate melts and offer valuable insights for materials and process engineering applications.
AB - Ceramic dissolution within silicate melts is often caused by Marangoni convection arising from surface tension gradients, unless it is counteracted by forced convection, which typically occurs beyond a specific critical Reynolds number (〖Re〗_c). This study presents a method for determining the 〖Re〗_c required to suppress Marangoni convection at the alumina (Al2O3)/slag/air triple point. This approach utilizes a modified finger test device equipped with a high-resolution laser for dimensional measurement, allowing accurate determination of mass flux densities from the grove and mantle separately. Subsequently, we examined the dissolution of Al2O3 fine ceramics in a quaternary silicate melt of calcium oxide (CaO)–Al2O3–silicon dioxide (SiO2)–MgO (or magnesium oxide), featuring a CaO/SiO2 weight ratio of 0.65. The experiments were conducted at 1550 °C for speeds of 0, 50, 100, and 200 rpm. The findings revealed a critical rotational speed of 127 rpm for Al2O3-dissolution in this silicate slag at 1550 °C using the aforementioned device, corresponding to an 〖Re〗_c of 6.46. These results contribute to a deeper understanding of the factors influencing ceramic dissolution in silicate melts and offer valuable insights for materials and process engineering applications.
KW - Alumina
KW - Marangoni convection
KW - Corrosion
KW - Silicate slag
KW - Critical Reynolds number
UR - http://www.scopus.com/inward/record.url?scp=85186974714&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2024.02.316
DO - 10.1016/j.ceramint.2024.02.316
M3 - Article
VL - 50.2024
SP - 18323
EP - 18328
JO - Ceramics International : CI
JF - Ceramics International : CI
SN - 0272-8842
IS - 11 Part A
ER -
