Numerical study on heat and mass transfer mechanisms of Janus particle sedimentation considering corrosion--颗粒学报PARTICUOLOGY

Xu, Z., & Zhao, Z. (2023). Numerical study on heat and mass transfer mechanisms of Janus particle sedimentation considering corrosion. Particuology, 83, 71-90. https://doi.org/10.1016/j.partic.2023.02.011

Numerical study on heat and mass transfer mechanisms of Janus particle sedimentation considering corrosion

Zhiguo Xu ^*, Zelin Zhao

School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China

10.1016/j.partic.2023.02.011

Volume 83, December 2023, Pages 71-90

Received 23 November 2022, Revised 20 February 2023, Accepted 21 February 2023, Available online 2 March 2023, Version of Record 13 March 2023.

E-mail: zhiguoxu@sjtu.edu.cn

Highlights

• Corroded Janus particle settling process is investigated by IB-LBM.

• Chemical reaction heat ratio and particle number effects are revealed.

• Janus particle mass reduction, position and velocity are investigated.

• Janus particle position deviates from the uniform particle equilibrium position.

• Reaction rate affects concentration and temperature inhomogeneity.

Abstract

Janus particle is a research hotspot due to its novelty and settlement in acid liquid during wastewater treatment. Heat and mass transfer mechanisms of Janus particle sedimentation considering corrosion are numerically investigated based on immersed boundary lattice Boltzmann method. Chemical reaction heat ratio, Damkohler number, Peclet number, and particle number effects on temperature field, concentration field, Janus particle mass reduction, position, and velocity are investigated. The uniform particle has an equilibrium position of about 1/4 times the channel width for two corroded uniform particle settlement processes. The Janus particle horizontal position deviates from the uniform particle equilibrium position due to the force caused by nonuniform buoyancy and particle rotation. When the chemical reaction heat ratio is more than 1, the Janus particle horizontal position is closer to the channel centerline and has a positive deviation. However, the converse trend happens when the chemical reaction heat ratio is less than 1, and the Janus particle horizontal position has a negative deviation. The Janus particle horizontal position deviation magnitude increases with increasing Damkohler number and decreasing Peclet number. The horizontal position deviation phenomenon exists for the single corroded Janus particle and two corroded Janus particle settlement processes.

Graphical abstract

Keywords

Janus particle; Corrosion; Equilibrium position; Chemical reaction heat ratio; Temperature

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