Abstract
Rayleigh-Bénard-Marangoni instability in a bilayer system of self-rewetting fluid overlying a porous medium is investigated. The upper surface of the fluid layer is assumed non-deformable and a constant temperature gradient is imposed. Unlike in previous works, self-rewetting fluid is considered in this paper, whose surface tension is a quadratic function of temperature. As a result, it would reinforce or suppress the instability caused by buoyancy in different scenarios. Thorough study is carried out and the influence of depth ratio h, Rayleigh number Ra and Biot number Bi on instability of the system is discussed. It was found that the marginal curve is bimodal in certain combination of parameters and mode transition of convection is also found.
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Acknowledgements
This paper is dedicated to the 85th Birthday of Prof. W.R. Hu. R.L. The authors are supported by the National Natural Science Foundation of China (grant no. 52176065) and the Guangxi Natural Science Foundation (no. 2018GXNSFAA281331).
Funding
This study was funded by the National Natural Science Foundation of China (grant no. 52176065) and the Guangxi Natural Science Foundation (no. 2018GXNSFAA281331).
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Zhen Ouyang computed the results and wrote the manuscript. Rong Liu read and wrote the manuscript. Zijing Ding conceived the project and wrote the manuscript.
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Ouyang, Z., Liu, R. & Ding, Z. Rayleigh-Bénard-Marangoni Instability in a Self-rewetting Fluid Layer Overlying a Porous Medium. Microgravity Sci. Technol. 34, 76 (2022). https://doi.org/10.1007/s12217-022-09999-4
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DOI: https://doi.org/10.1007/s12217-022-09999-4