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

被引:2
|
作者
Liu, Wei [1 ,2 ]
Gui, Miao [3 ]
Zha, Yudong [3 ]
Li, Zengyao [3 ]
机构
[1] Green Water Co Ltd, Lishui 323900, Peoples R China
[2] China Huaneng Grp Co Ltd, Huaneng Nucl Energy Technol Inst, Shanghai 200126, Peoples R China
[3] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Xian 710049, Peoples R China
关键词
sludge paddle dryer; CFD; dropwise condensation; rotation; SEWAGE-SLUDGE; CFD; DROPWISE;
D O I
10.3390/en16020901
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
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.
引用
收藏
页数:15
相关论文
共 50 条
  • [1] A Numerical Investigation of the Gap Effect on the Condensation Heat Transfer in Vertical Mini-Channels with Various Wettability Conditions
    Son, Hyo Je
    Yang, Jae Sung
    Ha, Man Yeong
    Lee, Hanchoon
    Jung, Seungmo
    Min, June Kee
    ASHRAE TRANSACTIONS 2021, VOL 128, PT 1, 2022, 128 : 50 - 58
  • [2] Two-Dimensional Modelling of Sludge Heat and Mass Transfer in a Paddle Dryer
    Liu, Wei
    Gui, Miao
    Zhang, Fanghao
    Zha, Yudong
    Li, Zengyao
    ENERGIES, 2023, 16 (09)
  • [3] A numerical study on the condensation heat transfer in a vertical channel with various wettability conditions and gap spacing
    Son, Hyo Je
    Yang, Jae Sung
    Park, Jaehyun
    Ha, Man Yeong
    Lee, Hanchoon
    Jung, Seungmo
    Min, June Kee
    CASE STUDIES IN THERMAL ENGINEERING, 2022, 36
  • [4] Numerical investigation of condensation on microstructured surface with wettability patterns
    Ke, Zhaoqing
    Shi, Junxiang
    Zhang, Bo
    Chen, Chung-Lung
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2017, 115 : 1161 - 1172
  • [5] Influence of Surface Wettability on Dropwise Condensation Heat Transfer
    Chen, Yunfu
    MACHINERY, MATERIALS SCIENCE AND ENGINEERING APPLICATIONS, PTS 1 AND 2, 2011, 228-229 : 869 - 873
  • [6] Effect of rotation and surface roughness on heat transfer rate to flow through vertical cylinders in steam condensation process
    Mohamed, HA
    JOURNAL OF HEAT TRANSFER-TRANSACTIONS OF THE ASME, 2006, 128 (03): : 318 - 323
  • [7] Visualization study on the condensation heat transfer on vertical surfaces with a wettability gradient
    Deng, Zilong
    Gao, Shangwen
    Wang, He
    Liu, Xiangdong
    Zhang, Chengbin
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2022, 184
  • [8] Effect of aluminum heat exchanger surface wettability on condensation heat transfer and water harvesting performance
    Ghaddar, Dalia
    Boyina, Kalyan
    Chettiar, Kaushik
    Wang, Sophie
    Miljkovic, Nenad
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2025, 243
  • [9] Numerical investigation into the effect of surface wettability in pool boiling heat transfer with a stochastic-automata model
    Marcel, C.
    Clausse, A.
    Frankiewicz, C.
    Betz, A.
    Attinger, D.
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2017, 111 : 657 - 665
  • [10] Enhancement of condensation heat transfer on a microstructured surface with wettability gradient
    Tokunaga, Atsushi
    Tsuruta, Takaharu
    INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2020, 156 (156)