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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.Pressure drop

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Now showing 1 - 2 of 2
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    Heat transfer and thermodynamic analysis by introducing multiple alternation structures into double-layer microchannel heat sinks
    (2019-11-01)
    Shen, Han
    ;
    Xie, Gongnan
    ;
    Wang, Chi-Chuan
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    The study examined the performance of a novel staggered flow alternation structure in the Double-layer Microchannel Heat Sink (DMHS) based on authors' prior work and further detailed and quantitatively influences regarding the effects of the numbers of multiple staggered flow alternation structures are thoroughly investigated. Yet the analysis also contains more in-depth description about the entropy generation caused by heat transfer and liquid flow based on the second-law perspective. The major influential factors combining thermal performance and pressure drop penalty such as Nusselt number, Reynolds number, pumping power and thermal performance factor have been numerically studied. Moreover, the flow directions with parallel/counter stream were also compared in the present work. Through these detailed analysis, the propose multiple novel design offers much superior performance with better thermal uniformity and augment entropy generation number. The results show that the temperature difference of the substrate can be made quite uniformly by adding the number of multiple staggered flow alternation structure, and superior performance of the proposed DMHS can be achieved with affordable pressure drop penalty, while the DMHS with single alternation structure shows higher thermal performance.
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    Item type:Item,
    A parametric study on thermal performance of microchannel heat sinks with internally vertical bifurcations in laminar liquid flow
    (2018-02-01)
    Shen, Han
    ;
    Wang, Chi-Chuan
    ;
    Xie, Gongnan
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    The optimal position of internal vertical bifurcation integrated with a microchannel heat sink (MHS) is investigated numerically in the present research. The corresponding rectangular smooth microchannel is compared with those with internal vertical bifurcation. The optimal position along the streamwise direction for interval distances is studied in detail. The corresponding temperature fields, flow fields, pressure drop and thermal characteristics are presented through verified computational model. The numerical simulation indicates that a clear inflection point of pressure gradient may prevail with the presence of internal vertical bifurcation. It is also found that the microchannel heat sink with a small distance between the tail end of internal vertical bifurcation and the outlet of microchannel shows the best thermal performance instead of those with setting the tail end of internal bifurcation at the outlet of microchannel. The proposed optimal design of internal vertical bifurcation shows improved thermal performance without any pressure drop penalty. (C) 2017 Elsevier Ltd. All rights reserved.