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Direct numerical simulation of a moving droplet impacting a moving particle: effects of particle–droplet density ratio, Bond number, and Reynolds number

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Abstract

In this work, a moving droplet impacting a moving particle is investigated for a wide range of impact conditions: particle–droplet density ratio (1 ≤ Ω ≤ 10), Bond number (0.177 ≤ Bo ≤ 1.765), and Reynolds number (16.381 ≤ Re ≤ 32.763), by using the lattice Boltzmann method (LBM) coupled with a modified immersed boundary method. Six key results are obtained. (1) Three collision regimes are identified in this work: separation, deposition, and agglomeration. (2) The separation regime can be split into two sub-regimes: separation-I and separation-II. (3) And the agglomeration also has two sub-regimes: agglomeration-I and agglomeration-II. In the available literature, the agglomeration-II was discussed only for a droplet impacting a fixed particle, but never for a moving particle. (4) For deposition and agglomeration, the vertical velocity of the particle experiences three stages, while for separation, the vertical velocity of the particle can be classified into four stages. (5) For separation-II process, the vertical velocity of the droplet is larger than its particle counterpart. (6) A regime map for Re–Ω is concluded.

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Data Availability Statement

This manuscript has associated data in a data repository. [Authors’ comment: The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.].

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Authors and Affiliations

  1. Hubei Key Laboratory of Advanced Technology for Automotive Components, School of Automotive Engineering, Wuhan University of Technology, Wuhan, China

    Guoqiang Wu

  2. Hubei Collaborative Innovation Center for Automotive Components Technology, Wuhan, China

    Guoqiang Wu & Sheng Chen

  3. School of Computing, Engineering and Built Environment, Glasgow Caledonian University, Glasgow, UK

    Sheng Chen

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  1. Guoqiang Wu
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Correspondence to Sheng Chen.

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Wu, G., Chen, S. Direct numerical simulation of a moving droplet impacting a moving particle: effects of particle–droplet density ratio, Bond number, and Reynolds number. Eur. Phys. J. Plus 138, 723 (2023). https://doi.org/10.1140/epjp/s13360-023-04354-x

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