ISSN Online: 2379-1748
ISBN Flash Drive: 978-1-56700-472-4
ISBN Online: 978-1-56700-471-7
3rd Thermal and Fluids Engineering Conference (TFEC)
NUMERICAL PREDICTION OF LIQUID FILM FLOW CHARACTERISTICS OF COLUMN FLOW OUTSIDE HORISONTAL TUBE
摘要
The falling film on horizontal tube banks is widely used in the multiple-effect evaporator. The film flow patterns
outside the tube play a major role in the convective evaporation. In this study, a fixed three-dimensional model
was applied to simulate the liquid film spreading process and liquid film thickness distribution. The effects of
one liquid column on the flow behavior of the one next to it were discussed in detail. The so-called volume of
fluid method (VOF) was used to deal with the interface between the liquid and gas phase using Fluent 14.5. It
was found that two adjacent columns both spread along the axial direction and collide with each other at the
midpoint between two columns. The liquid film distribution in the circumferential direction varies with different
circumferential angles. When liquid column impact the horizontal tube, there would form a speed lag area near
the tube surface and the liquid film thickness and velocity increase with the Re increasing.