Bubble growth model in uniformly superheated binary liquid mixture. (December 2018)

• Record Type: Journal Article
• Authors: Cai, Chang; Liu, Hong; Xi, Xi; Jia, Ming; Yin, Hongchao
• Is Part Of: International journal of heat and mass transfer. Volume 127(2018)Part B
• Page Start: 629
• Page End: 638
• Publication Date: 2018-12
• Subjects: Bubble growth -- Ethanol-water mixture -- Mass diffusion -- Heat transfer; Heat -- Transmission -- Periodicals; Mass transfer -- Periodicals; Chaleur -- Transmission -- Périodiques; Transfert de masse -- Périodiques; Electronic journals; 621.4022
• DOI: 10.1016/j.ijheatmasstransfer.2018.07.084
• Languages: English
• ISSNs: 0017-9310

Abstract

Highlights: A novel model was developed to study bubble growth in superheated binary mixture. Temperature and concentration were assumed quadratic within boundary layers. PR equation and NRTL equation were adopted to estimate VLE at the bubble surface. The maximum mass diffusion limitation on bubble growth rate was proposed. Abstract: A novel model was developed to investigate the fundamental heat transfer and mass diffusion mechanisms of bubble growth in uniformly superheated ethanol–water mixture. In the proposed model, the energy equation was applied coupling with the quadratic temperature distribution within the thermal boundary layer. The mass diffusion effect was accounted by the introduction of species conservation equation in combination with the quadratic concentration distribution within the concentration boundary layer. Peng-Robinson equation of state and activity coefficient calculation were also adopted for the estimation of vapor-liquid equilibrium. In the present study, the maximum mass diffusion limited growth rate was proposed to quantify and illustrate the effect of mass diffusion on bubble growth. The results show that the bubble growth process in a binary mixture can be divided into three distinctive stages. The later stage of bubble growth is mainly subject to mass diffusion and partly to heat transfer at low ethanol concentrations.