Heat Transfer in the Liquid-Liquid Spray Tower

摘要

This study analyzes the operation of liquid-liquid spray tower heat exchangers. It describes how the rational design of spray towers requires: 1. Hydrodynamic correlations which predict the expected drop size and hold-up, and, 2. Heat transfer correlations which either predict the area heat transfer coefficients on the inside and outside of the drops separately or the overall coefficient itself. The experimental portion of this program has been concerned with obtaining the above-mentioned heat transfer correlations for the case of water heated by AMSCO oil. The tests have been conducted with both water and oil as the dispersed phases under conditions of flooding and nonflooding. It has been demonstrated that stable flooded operation is possible when proper attention is paid to end design. Electric fields have been used at the distributor to obtain modest uniform reductions in drop size. However, since the same magnitude of reduction can be obtained easily by going to the jet-wise mode of drop formation, the use of EHD techniques in spray towers cannot be recommended. (Author)