https://doi.org/10.1140/epjp/s13360-024-05650-w
Regular Article
Numerical investigation of two-phase flow control based on the coalescence under variation of gravity conditions
1
Department of Aerospace Engineering, K. N. Toosi University of Technology, Tehran, Iran
2
Aerospace Research Institute (Ministry of Science, Research and Technology), Tehran, Iran
Received:
1
November
2023
Accepted:
12
September
2024
Published online:
21
September
2024
Numerical simulations were conducted to investigate the dynamics of forced coalescence resulting from the effects of gravitational fields on two droplets on a substrate. To achieve this, flow quantities were calculated using a modified multi-relaxation-time color gradient lattice Boltzmann method. The outcomes are presented in both qualitative and quantitative terms. Based on the results, four distinct dynamics can be observed for this physical issue. These dynamic behaviors are related to the magnitude of the gravitational fields and the distance between the droplets. When the ratio of the distance between two droplets and the thickness of the fluid–fluid interface is greater than 2, the coalescence phenomena do not occur unless the Bond number is higher than its corresponding critical value (~ 6.06 × 10−12) in this study). If the distance ratio is less than 2 and the Bond number is below the critical value, two droplets will coalesce, and the resulting droplet will begin to move. However, if the Bond number is greater than the critical value, two droplets will still coalesce, but the resulting droplet will be separated. This work will illustrate the differences.
Copyright comment Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
