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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Author(s)
Yan Yan and Dong Jixian
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DOI:10.17265/1934-8975/2017.07.005
Affiliation(s)
Shaanxi University of Science & Technology, Xi’an 710021, China
ABSTRACT
An
approach to design multi-channel cylinder dryer was proposed. The heat transfer
performance and flow characteristic under various structural parameters were
analyzed. First, an experiment was designed and set up to measure the
condensing heat transfer coefficient and the pressure drop in order to verify
the applicability of the Cavallini’s correlation. Then, the relationship among
the count of channels, aspect ratio, spacing ratio, width, height and hydraulic
diameter of a channel was given. Finally, the correlation of condensing heat
transfer and the homogeneous model was introduced in order to observe the heat transfer performance and flow
characteristic of the multi-channel cylinder dryer affected by different
structures. The study reveals that the structural parameters including count of
channels, aspect ratio, spacing ratio of a channel dramatically influence the
condensation heat transfer coefficient and frictional resistance of the steam.
Based on the selected paper machine, it is suggested that the overall
performance of the multi-channel cylinder dryer is best if the count of
channels is 150-200, the aspect ratio is 1 : 3 and the spacing ratio is 1 : 1-1 : 3.
KEYWORDS
Multi-channel cylinder dryer, condensation heat transfer, distributed parameter model, numerical simulation.
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