Numerical analysis on flow dynamics and heat transfer of falling liquid films with interfacial waves

✍ Scribed by A. Miyara

• Publisher: Springer-Verlag
• Year: 1999
• Tongue: English
• Weight: 274 KB
• Volume: 35
• Category: Article
• ISSN: 1432-1181
• DOI: 10.1007/s002310050328

✦ Synopsis

Flow dynamics and heat transfer of falling liquid ®lms with interfacial waves ¯owing on a vertical plate have been studied with originally proposed numerical simulation method. To discretize basic equations a staggered grid ®xed on a physical space is employed. A small amplitude disturbance generated at in¯ow boundary develops to a solitary wave which consists of a large amplitude roll wave and small amplitude capillary waves. Instantaneous streamwise velocity pro®les at the wave crest and trough are very different from a laminar ¯ow. A circulation ¯ow occurs in the roll wave and it affects temperature distributions, especially the strong effect is observed for high Prandtl number liquids. The interfacial wave enhances the heat transfer by two kinds of effects which are a ®lm thinning effect and a convection effect. The dominating effect depends on the Prandtl number.