Numerical Investigation of the Effect of Surface Wettability and Rotation on Condensation Heat Transfer in a Sludge Dryer Vertical Paddle

In this paper, the applicability of advanced heat transfer enhancement technology to a paddle dryer was discussed. A computational fluid dynamics (CFD) method was used to simulate condensation heat transfer on the inner surface of a dryer paddle. The effect of surface wettability and rotation on con...

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Bibliographic Details
Published in:Energies (Basel) 2023-01, Vol.16 (2), p.901
Main Authors: Liu, Wei, Gui, Miao, Zha, Yudong, Li, Zengyao
Format: Article
Language:English
Subjects:
Angular velocity
CFD
Computational fluid dynamics
Computer applications
Condensation
Contact angle
Cost control
dropwise condensation
Environmental impact
Evaporation
Evaporation rate
Experiments
Fluid dynamics
Heat transfer
Heat transfer coefficients
Hydrodynamics
Numerical analysis
Rotation
Simulation
Sludge
Sludge drying
sludge paddle dryer
Wall temperature
Washers & dryers
Wettability
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Summary:In this paper, the applicability of advanced heat transfer enhancement technology to a paddle dryer was discussed. A computational fluid dynamics (CFD) method was used to simulate condensation heat transfer on the inner surface of a dryer paddle. The effect of surface wettability and rotation on condensation heat transfer and droplet behavior was studied. The results showed that the present CFD model could properly simulate the condensation process on a vertical surface. With a decrease in the contact angle, the filmwise condensation turned into a dropwise condensation, which resulted in a significant increase in heat transfer coefficient and provided an approximately 5% increase in evaporation rate for the paddle dryer by changing the wettability of the inner surface of the paddle. Additionally, with a change in rotational angular velocity, heat transfer performance was almost unchanged under the filmwise condensation condition. However, rotational motion might cause a decrease in wall temperature and the equivalent evaporation rate under the dropwise condensation condition. Only a 2.4% increase in the equivalent evaporation rate was found in dropwise condensation with rotation, which indicated that changing the wettability inside the paddle could not be an effective means to enhance the heat transfer and drying efficiency of a rotating paddle dryer.
ISSN:1996-1073
1996-1073
DOI:10.3390/en16020901