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🏛️國立陽明交通大學機構典藏

Author: search.filters.author.Shen, HanSubject: search.filters.subject.Thermal performance

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    Comparative study for convective heat transfer of counter-flow wavy double-layer microchannel heat sinks in staggered arrangement
    (2018-06-05)
    Shen, Han
    ;
    Zhang, Yingchun
    ;
    Wang, Chi-Chuan
    ;
    Xie, Gongnan
    ;
    機械工程學系
    This study proposes a modification of double-layer Microchannel Heat Sinks (DMHSs) into wavy configuration with swap of upper and lower layer design. The design can effectively improve the comparatively low cooling effectiveness at the upper layer, yet the swap of flow can promote re-developing of flow field and heat transfer accordingly. Both parallel and counter flow arrangements of the proposed configurations are examined in details. It is found that the staggered wavy DMHSs with opposite amplitude shows superior heat transfer enhancement. Regardless of the types of heat sink being investigated, the maximum temperature for all parallel flow arrangement always occurs at the exit while the maximum temperature for counter flow is in the interior of heat sink but is close to the exit. Interestingly, the swap design of counter flow arrangement (parallel channel or wavy) shows two maximum temperatures in the first and second half of the heat sink. Basically, the counter flow of straight staggered DMHS has the best overall thermal performance among the counter flows of straight parallel DMHS, synclastic wavy staggered DMHS and opposite wavy staggered DMHS. This is because the wavy staggered DMHS incur more pressure drop and pumping power accordingly.
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    Parametric study on thermal performance of microchannel heat sinks with internal vertical Y-shaped bifurcations
    (2015-11-01)
    Xie, Gongnan
    ;
    Shen, Han
    ;
    Wang, Chi-Chuan
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    In this paper, internal vertical Y-shaped bifurcation plates are integrated with the microchannel heat sink (MHS), and its corresponding thermal and fluid flow characteristics are investigated numerically. The effect of the length of Y-shaped bifurcation and the angles of the arms on the overall performance are examined. A best Y-shaped plate length are firstly screened out from three designs and are compared with the corresponding rectangular smooth microchannel. Based on the best thermal performance with a specific length, the effect of arm angles in terms of five different configurations of Y-shaped plates are further investigated. Through the calculations, the corresponding flow field, temperature field and pressure drop characteristics are reported. It is found that the thermal performance of MHSs with internal Y-shaped bifurcations is much better than that of the traditional rectangular microchannel. The longest internal Y-shaped bifurcation microchannel results in best thermal performance. On the other hand, a larger arm angle leads to a better thermal performance of the internal Y-shaped bifurcation microchannel. (C) 2015 Elsevier Ltd. All rights reserved.