Marangoni convection and mass transfer from the liquid to the gas phase under microgravity conditions

✍ Scribed by J. H. Lichtenbelt; A. A. H. Drinkenburg; H. A. Dijkstra

• Book ID: 104742884
• Publisher: Springer
• Year: 1986
• Tongue: English
• Weight: 401 KB
• Volume: 73
• Category: Article
• ISSN: 0028-1042
• DOI: 10.1007/bf00367264

✦ Synopsis

p , urification processes, like distillation, adsorp- tion and desorption, are of great importance in chemical engineering. In most systems compounds are transferred between two immiscible liquids or between a liquid and a gas. The flow directions of the two phases can be co-current, crosscurrent or counter-current, the counter-current process having the highest efficiency. Where possible, this last process is used in industry, for instance in spray towers, plate columns and packed columns. A packed column is a hollow, vertical cylinder filled with particles, which can be of any shape. In a transfer process, involving a liquid and a gas, the liquid flows downward over the packing in the shape of films, rivulets and droplets. The function of the packing material is to create a large contact area between the two fluids. The degree of performance of the transfer process can be expressed by the quantity Nog, i.e. the number of the transfer units. In a packed column Nog is proportional to the product of the mass transfer coefficient K and the contact area A.