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 used simulate condensation on inner surface paddle. The effect wettability and rotation droplet behavior studied. results showed that present CFD model could properly process vertical surface. With decrease in contact angle, filmwise turned into dropwise condensation, which resulted significant increase coefficient provided an approximately 5% evaporation rate for by changing Additionally, with change rotational angular velocity, performance almost unchanged under condition. However, motion might cause wall temperature equivalent Only 2.4% found rotation, indicated inside not be effective means enhance drying efficiency rotating dryer.