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<p>Tungsten trioxide (WO<sub>3</sub>) has been attractively considered for experimentally proven applications in fabricating photo-catalysis, electro-chromic and photochromic devices. The wet chemical synthesis method is one of the popular synthesis methods, in which WO<sub>3</sub> powder quality depends strongly on the drying methods and drying conditions, meanwhile drying process contains the complicated transport phenomena. In this work, the drying processes of the WO<sub>3</sub>.H<sub>2</sub>O suspension which is prepared through wet chemical methods is studied by both experiment and simulation. The results indicate that the spray drying method increases the specific surface area, pore size and pore volume of the material without altering the crystal phase structure of WO<sub>3</sub>.H<sub>2</sub>O. Besides, the adsorption ability of powder obtained from spray drying is also better than those obtained from conventional drying. Optimal spray drying conditions are yielded from Taguchi method, in which the optimal drying conditions are: inlet air temperature of 120&#xa0;°C, pumping velocity of 15&#xa0;rpm, initial solid mass concentration of 7.5%. CFD simulation by ANSYS Fluent for the spray dryer shows the good agreement with the experimental data, in which the characteristic drying curve (CDC) is applied and combined as user defined function (UDF) to describe the drying dynamics of particles. The critical moisture content of particle is estimated as 0.614&#xa0;kg water/kg dried solid. Resident time of particles is from 1.18&#xa0;s to 45.15&#xa0;s while the drying time is smaller than 0.2s so the height of the dryer can be reduced.</p>

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Synthesis of WO3 powder by spray drying process: experimental study and CFD simulation

  • 期刊论文

  • 发表日期：

    2025年9月12日

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  • Thi Thu Hang Tran,
  • Tuyen Hoang Vu,
  • Minh Tien Hoang,
  • Tran Tho Dang,
  • Kieu Hiep Le,
  • Do Y Nhi Nguyen,
  • Cong Tu Nguyen

摘要

Tungsten trioxide (WO3) has been attractively considered for experimentally proven applications in fabricating photo-catalysis, electro-chromic and photochromic devices. The wet chemical synthesis method is one of the popular synthesis methods, in which WO3 powder quality depends strongly on the drying methods and drying conditions, meanwhile drying process contains the complicated transport phenomena. In this work, the drying processes of the WO3.H2O suspension which is prepared through wet chemical methods is studied by both experiment and simulation. The results indicate that the spray drying method increases the specific surface area, pore size and pore volume of the material without altering the crystal phase structure of WO3.H2O. Besides, the adsorption ability of powder obtained from spray drying is also better than those obtained from conventional drying. Optimal spray drying conditions are yielded from Taguchi method, in which the optimal drying conditions are: inlet air temperature of 120 °C, pumping velocity of 15 rpm, initial solid mass concentration of 7.5%. CFD simulation by ANSYS Fluent for the spray dryer shows the good agreement with the experimental data, in which the characteristic drying curve (CDC) is applied and combined as user defined function (UDF) to describe the drying dynamics of particles. The critical moisture content of particle is estimated as 0.614 kg water/kg dried solid. Resident time of particles is from 1.18 s to 45.15 s while the drying time is smaller than 0.2s so the height of the dryer can be reduced.