Numerical simulation and modeling of the heat and mass transfer in a grooved flat falling film evaporator

Falling film plate exchanger are used in a wide range of systems thanks to their high heat and mass transfer performance for a low cost. In this study, a grooved plate is considered for its ability to improve the wetting of the surface compared to a smooth plate. To characterize the heat transfer an...

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Bibliographic Details
Published in:International journal of refrigeration 2023-02, Vol.146, p.148-157
Main Authors: Collignon, R., Stutz, B.
Format: Article
Language:English
Subjects:
Chemical and Process Engineering
Engineering Sciences
Evaporator
Falling film
Film tombant
Heat transfer
Mechanics
Pression sous-atmosphérique
Reactive fluid environment
Subatmospheric pressure
Thermics
Transfert de chaleur
Évaporateur
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Summary:Falling film plate exchanger are used in a wide range of systems thanks to their high heat and mass transfer performance for a low cost. In this study, a grooved plate is considered for its ability to improve the wetting of the surface compared to a smooth plate. To characterize the heat transfer and evaporation rate of the system, a numerical model has been developed to take account of the new geometry and has been confronted to experimental results. Despite the high aspect ratio of the falling film, the fin effect is very high on the heat transfer and on the vaporization process due to the triple contact lines. The principal aim of this study is to develop a simple and light model able to accurately describe the heat and mass transfer behavior of film while it flows down in the grooves of the vertical plate of the evaporator. The influence of the operating conditions on the evaporator effectiveness are evaluated thanks to numerical investigations.
ISSN:0140-7007
1879-2081
DOI:10.1016/j.ijrefrig.2022.10.021