An experimental analysis of the topology and dynamics of a falling liquid film over the wavy surface of a vertical pillow plate
Abstract
The successful design of pillow-plate condensers requires specific knowledge of the falling liquid film characteristics. Due to the typical wavy, "pillow-like" surface of pillow plates, the film flow here differs from the flow over vertical smooth walls. In this work, we visualized the topology and free surface waviness of a falling liquid film over a vertical pillow plate by using a fluorescent dye and a high speed camera. First observations show that the liquid film preferably flows down the rows of vertically aligned welding spots (zone 1). As a result, the wall surface between these rows is covered by a thinner film (zone 2). In order to quantify this "2-zone" topology, we measured the local mass flow rate in zone 1 over the height of the pillow plate. The results confirmed that the liquid film is mainly "drained" in zone 1. The findings of this study will help to develop flow-pattern-oriented modeling methods and to design pillow-plate falling film equipment.
- Publication:
-
Chemical Engineering Science
- Pub Date:
- July 2015
- DOI:
- 10.1016/j.ces.2015.03.005
- Bibcode:
- 2015ChEnS.130..129P
- Keywords:
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- Pillow plate;
- Falling film;
- Flow topology;
- Free surface motion