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Effect of Steam Condensation Flow in Multi-channel Dryer Channels on the Heat Transfer Characteristics
  
DOI：10.11980/j.issn.0254-508X.2019.01.010
Key Words:condensation heat transfer  two-phase flow  pressure drop  visualization  multi-channel dryer
Fund Project:国家自然科学基金( 51375286)“无虹吸管多通道烘缸流体流动及干燥机理的研究”。
Author NameAffiliation
YANG Zhuozhi1 1. College of Mechanical and Electrical Engineering， Shaanxi University of Science and Technology， Xi′an， Shaanxi Province， 710021 
DONG Jixian1,* 1. College of Mechanical and Electrical Engineering， Shaanxi University of Science and Technology， Xi′an， Shaanxi Province， 710021 
QIAO Lijie1 1. College of Mechanical and Electrical Engineering， Shaanxi University of Science and Technology， Xi′an， Shaanxi Province， 710021 
YAN Yan2 2. College of Mechanical and Electrical Engineering， Xi′an Polytechnic University， Xi′an， Shaanxi Province， 710048 
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Abstract:In order to improve the heat transfer efficiency of multi-channel dryer and optimize its steam utilization， this paper studied the condensation heat transfer process of steam in a horizontal rectangular channel， and visually observed the condensation process with a high-speed camera. Under the different conditions of steam mass flow rate and cooling water mass flow， the variation of both flow patterns of gas-liquid two phases in the channel was analyzed. The variation law of steam condensation heat transfer coefficient and pressure drop along the wall of the channel was studied. The resules provided the basis for the studies of steam flowing and heat transfer mechanism on the inside of multi-channel dryer．
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