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<p>Vertical vibration is an effective technique for enhancing the thermal performance of granular systems; however, a quantitative understanding of its influence on cohesive media is still limited. This study employs the thermal discrete element method (DEM) to investigate the heat transfer and flow dynamics of cohesive particles in a vertically vibrated container. A bond number scaling strategy is adopted to capture the characteristic behaviors of fine powders. The results demonstrated that while vibration slightly reduced the overall heating rate compared to a stationary system, it significantly enhanced temperature uniformity by transitioning the heat transfer mode from conduction to convective mixing. The relationship between vibration parameters and thermal performance was found to be non-monotonic. An optimal dimensionless vibration intensity (<InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\Gamma \approx 138\)</EquationSource> </InlineEquation>) was identified, which maximized heating efficiency. Furthermore, a critical range of dimensionless amplitude (<InlineEquation ID="IEq2"> <EquationSource Format="TEX">\(0.17&lt;Ar&lt;0.27\)</EquationSource> </InlineEquation>) marked the transition to full fluidization. Regarding cohesion, moderate surface energy stabilized the fluidized bed, whereas excessive cohesion overwhelmed the vibrational input, causing re-agglomeration. Finally, a unified dimensionless framework was proposed, revealing that the thermal flow regime was governed by the competition between vibrational intensity and the bond number. These findings provide theoretical insights for optimizing the processing of cohesive granular materials. </p> Graphical Abstract <p></p>

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Thermal DEM study of heat transfer and flow patterns of fine cohesive particles under vertical vibration

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Dongdong Fang,
  • Xiaotian Li,
  • Xiaobin Zhan,
  • Xiwen Li

摘要

Vertical vibration is an effective technique for enhancing the thermal performance of granular systems; however, a quantitative understanding of its influence on cohesive media is still limited. This study employs the thermal discrete element method (DEM) to investigate the heat transfer and flow dynamics of cohesive particles in a vertically vibrated container. A bond number scaling strategy is adopted to capture the characteristic behaviors of fine powders. The results demonstrated that while vibration slightly reduced the overall heating rate compared to a stationary system, it significantly enhanced temperature uniformity by transitioning the heat transfer mode from conduction to convective mixing. The relationship between vibration parameters and thermal performance was found to be non-monotonic. An optimal dimensionless vibration intensity ( \(\Gamma \approx 138\) ) was identified, which maximized heating efficiency. Furthermore, a critical range of dimensionless amplitude ( \(0.17<Ar<0.27\) ) marked the transition to full fluidization. Regarding cohesion, moderate surface energy stabilized the fluidized bed, whereas excessive cohesion overwhelmed the vibrational input, causing re-agglomeration. Finally, a unified dimensionless framework was proposed, revealing that the thermal flow regime was governed by the competition between vibrational intensity and the bond number. These findings provide theoretical insights for optimizing the processing of cohesive granular materials.

Graphical Abstract