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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Chen, Ing YounSubject: search.filters.subject.Heat sink

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    An experimental investigation of air cooling thermal module using various enhancements at low Reynolds number region
    (2010-12-01)
    Yang, Kai-Shing
    ;
    Li, Shu-Lin
    ;
    Chen, Ing Youn
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    Chien, Kuo-Hsiang
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    Hu, Robert
    This study examines the airside performance of heat sinks having fin patterns of plate fin (Type I), interrupted fill geometry (Type II), dense vortex generator (Type III), and loose vortex generator (Type IV). Test results indicate that the heat transfer performance is strongly related to the arrangement of enhancements. The interrupted and dense vortex generator configurations normally contribute more pressure drop penalty than improvements of heat transfer. This is especially pronounced when operated at a lower frontal velocity. Actually the plain fin geometry outperforms most of the enhanced fin patterns such as of Type II and Type Ill at the fully developed region. This is because a close spacing prevents the formation of vortex, and the presence of interrupted surface may also suffer from the degradation by constriction of conduction path. The results suggest that the vortex generators operated at a higher frontal velocity is more beneficial than that of plain fin geometry. In association with the VG-1 criteria (same pumping power and same heat transfer capacity), the results show that effective reduction of surface area can be achieved when the frontal velocities are at 3-5 m s(-1) and the fin patterns are triangular, triangular attack, or two-groups dimple. The result from the present experiment suggests that the asymmetric combination such as using loose vortex generator (Type IV) can be quite effective. The triangular attack vortex generator is regarded as the optimum enhancement design for it could reduce 12-15% surface area at a frontal velocity around 3-5 m s(-1). The asymmetric design is still applicable even when the fin pitch is reduced to 1 mm. (C) 2010 Elsevier Ltd. All rights reserved.
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    Effect of cannelure fin configuration on compact aircooling heat sink
    (2011-07-01)
    Wang, Chi-Chuan
    ;
    Yang, Kai-Shing
    ;
    Liu, Yang-Ping
    ;
    Chen, Ing Youn
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    機械工程學系
    The present study proposed a novel cannelure fin structure applicable to compact air-cooled heat sink under cross flow condition. A total of eight heat sinks were made and tested, including plain fin, oblique dimple type (I), oblique dimple type (II), straight cannelure, full oblique cannelure, half oblique cannelure with dimple/cavity type, half oblique cannelure with dimple/cavity type (II), and full oblique cannelure with dimple/cavity. Test results indicate that the proposed full cannelure fin along with the dimple/cavity structure can attain approximately 25% increase of heat transfer performance, and accompanies a friction reduction of about 20%. Moreover, converse to those interrupted fin or triangular vortex generator, it is found that the proposed fin structure still offers significant augmentation in fully developed region. The observed IR image of the temperature measurement of the test fin configurations also confirms the measurements. (C) 2011 Elsevier Ltd. All rights reserved.