Numerical simulation of the behavior of high-viscosity fluids falling film flow down the vertical wavy wall

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• 作者：Shichang Chen ; Jianping Ma ; Xianming Zhang and Wenxing Chen
• 刊名：Asia-Pacific Journal of Chemical Engineering
• 出版年：2017
• 出版时间：January/February 2017
• 年：2017
• 卷：12
• 期：1
• 页码：97-109
• 全文大小：765K
• ISSN：1932-2143

文摘

Falling film flow with high-viscosity fluid is used throughout in the process intensification of industry production. However, analysis of wave characteristics based on operational conditions and independent of the geometrical wall is seriously restricted to low-fluid viscosity. A general predictability of dynamic flow behavior of highly viscous fluid falling film flow is lacking. Our work has been motivated by such a challenge. Numerical simulations of gravity-driven two-dimensional steady falling film flow on vertical wall with wavy pattern were performed by using high-viscosity fluids. Changes of falling film hydrodynamics with the increase of flow rate and fluid viscosity, including local and overall film thickness characteristics and its distribution, as well as the comparison velocity distribution with typical parabolic profiles, were presented to understand the film flow behavior. Furthermore, the effect of structural parameters of wavy wall on the flow behaviors both in crest and in trough of wall was also discussed. It was found that the flow behavior of falling film with high-viscosity fluids was partly different from the film flow with very low fluids, and the film in trough was particularly sensitive to the changes either of the amplitude of wall or of the interval between two wave nodes.