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Heat Transfer of Steam Condensation in the Horizontal Channel of Multi-channel Dryer
Received:November 28, 2020  
DOI：10.11980/j.issn.0254-508X.2021.03.008
Key Words:paper drying  multi-channel cylinder dryer  horizontal rectangular channel  condensation correlation  condensation heat transfer coefficient
Fund Project:国家自然科学基金(51375286)；陕西省重点研发计划项目（2020 GY-105）。
Author NameAffiliationPostcode
QIAO Lijie College of Mechanical and Electrical Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
DONG Jixian College of Mechanical and Electrical Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
YANG Zhuozhi College of Flight Technology， Civil Aviation Flight University of China， Guanghan， Sichuan Province， 618307 618307
LIU Huan College of Mechanical and Electrical Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
WANG Sha College of Mechanical and Electrical Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
DONG Yan College of Mechanical and Electrical Engineering， Shaanxi University of Science & Technology， Xi’an， Shaanxi Province， 710021 710021
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Abstract:In this paper， the change of condensation heat transfer coefficients in the horizontal rectangular channel of a multi-channel cylinder dryer under different condensation conditions was analysed. The results showed that the condensation heat transfer coefficient increased with the increase of steam mass flux and the Reynolds number of cooling water. However， there was a fluctuation of the condensation heat transfer coefficient with the increase of the Reynolds number of cooling water. A better heat transfer performance could be achieved by increasing the steam mass flux， meanwhile， excessive pressure drop of two-phase flow could be avoided by setting the steam mass flux of 24 kg/（m2∙s）. It was found that the Shah (1979) correlation had a better predictability for the steam condensation heat transfer coefficient in the horizontal channel of the multi-channel dryer through comparing the experimental value and the calculated value of the condensation heat transfer coefficient calculated by the existing condensation heat transfer correlation.
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