Investigation on Solutal Marangoni Convection around a Bubble under Different Gravities
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ORIGINAL ARTICLE
Investigation on Solutal Marangoni Convection around a Bubble under Different Gravities Jia Guo 1 & Shuai Chen 1 & Jiahong Lan 1 & Zhenfeng Wang 1 & Yong Sha 1 Received: 19 February 2020 / Accepted: 28 June 2020 # Springer Nature B.V. 2020
Abstract The Marangoni convection during isopropanol volatilization to a single nitrogen bubble with the deformable interface is investigated by combining the Volume of Fluid model and the Level Set method. Both the deformation of the bubble and the thermal effect accompanying with the mass transfer are taken into account. The Marangoni convection is investigated under non-gravity and gravity conditions respectively. The flow, temperature and concentration field information are acquired, and the influence of the Marangoni convection on the mass transfer is distinguished. The mass transfer process of a single rising bubble with different diameters in the stationary isopropanol aqueous solution is investigated under different gravities, and occurrence of the Marangoni convection is discriminated. Keywords Marangoni convection . Mass transfer . Bubble . Diffusion . Gravity
Introduction It is beneficial to understand the fluid movement mechanism around the bubble since the bubble is widely utilized to enhance the heat and mass transfer in various industrial processes (Akita and Yoshida 1973). Lots of works related to the fluid dynamics of the bubble can be found in the literature while the study on the bubble fluid dynamics with the mass transfer kinetics together is relatively rare. The mass transfer could result in the change of the surface tension along the bubble interface, then induce the emergence of the interfacial liquid flow, i.e. the Marangoni convection which can significantly enhance the heat and mass transfer process (Zheng et al. 2015; Sankaran and Yarin 2018; Francescantonio et al. 2008; Kuznetsov and Fominykh 2020). To avoid interference of the gravity-induced RayleighBénard convection, the survey on the Marangoni convection has better to be carried out under the microgravity condition. By means of experiments in the microgravity environment, hot capillary bubble migration at the high Marangoni number
* Yong Sha [email protected] 1
Department of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
and the solutal Marangoni convection during volatilization with different interface curvatures were observed (Thompson et al. 1980; Balasubramaniam and Lavery 1989; Lichtenbelt et al. 1986; Janssen et al. 1991; Hoefsloot et al. 1994; Chang and Benjamin 2020). These works showed that the thermal and solutal Marangoni convection induced by the transfer process can happen around a bubble, and play a significant role in the transfer process. It is essential to investigation on the Marangoni convection under gravity. It is well known that it is hardly possible for the bubble to investigate its local velocity field and component distribution simultaneously in details by means of experiment
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