Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
EXPERIMENTAL STUDY OF A HORIZONTAL LIQUID FILM HEAT EXCHANGER CONFIGURATION
Submission Author:
José Roberto Simões Moreira , SP , Brazil
Co-Authors:
Beethoven Narváez-Romo
Presenter: José Roberto Simões Moreira
doi://10.26678/ABCM.COBEM2023.COB2023-2419
Abstract
Flooded and falling film evaporators are commonly used in various engineering applications. In terms of heat transfer performance, falling liquid film has higher values than flooded evaporators. However, the wettability problems are still present in liquid falling film applications. Therefore, this study proposes a new heat exchanger configuration that uses a horizontal liquid film to improve wettability issues. The heat exchanger is composed of several vertically-oriented plates, each of which contains a spiral cooling tube. The secondary fluid flows inside the tube, while the water solution flows over spiral tube to form a horizontal liquid film. The experimental heat rate was computed by using water as working fluid. An overall balance of mass and energy equations was carried out. A set of experimental tests were carried out on the horizontal liquid film in which the inlet water temperature, and its mass flow rate were changed. The heat exchanger was characterized as a function of the mass flow rate and the inlet water temperature. Experimental results showed that heat rejection decreases as the position in the heat exchanger increases. The first group of plates transferred more than 40% of the total heat rate in the exchanger. Although the heat transfer rate increased as the mass flow rate increased, the non-dimensional heat transfer rate slightly changes.
Keywords
Wettability, Heat exchanger, Flooded, Falling film, Heat transfer
