Heat and mass transfer in two-phase flow - A mathematical model for laminar film flow and its experimental validation
Abstract
A mathematical model is presented for the vaporisation of liquid from a laminar film flowing down the inside surface of a smooth tube into a countercurrent laminar flow of gas. The partial differential equations that describe temperature and composition distributions are integrated across the tube to give a set of four coupled ordinary differential equations. A numerical method for the solution of the equations is proposed and examined; the method is posed to solve the transient response for heat and mass transfer. A satisfactory solution is found for a range of space and time intervals. The mathematical model has been validated by experimental measurements on a falling film evaporator with evaporation occurring at sub-boiling temperatures from a laminar liquid film into a laminar gas stream. The performance of the evaporator is assessed.
- Publication:
-
International Journal of Heat and Mass Transfer
- Pub Date:
- August 1982
- Bibcode:
- 1982IJHMT..25.1113C
- Keywords:
-
- Fluid Films;
- Heat Transfer;
- Laminar Flow;
- Mass Transfer;
- Two Phase Flow;
- Vaporizing;
- Evaporators;
- Finite Difference Theory;
- Single-Phase Flow;
- Fluid Mechanics and Heat Transfer