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Author: search.filters.author.Shen, HanSubject: search.filters.subject.Double-layer microchannel heat sinks

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    The numerical simulation with staggered alternation locations and multi-flow directions on the thermal performance of double-layer microchannel heat sinks
    (2019-12-25)
    Shen, Han
    ;
    Xie, Gongnan
    ;
    Wang, Chi-Chuan
    ;
    機械工程學系
    ;
    Department of Mechanical Engineering
    The novel staggered flow alternation structure (SFAS) proposed in prior study has proved to be an efficient way in improving the overall thermal performance with acceptable pressure drop penalty in Double-layer Microchannel Heat Sinks (DMHSs). Based on the prior design, a further numerical investigation concerning the optimum location of SFAS in DMHSs is presented. The corresponding temperature fields, Nusselt number, flow fields, pressure drop and thermal characteristics are presented through verified computational mode. In addition, the effect of flow arrangements such as concurrent, upper-inlet/lower-inlet countercurrent arrangement on the thermal performance are studied in more details. The best thermal location of SFAS in the DMHSs is found to be based on the alterable locations and multi-flow directions. Yet, changing the location of staggered alternation structure does not lead to an appreciable rise of pressure drop penalty in DMHSs. However, the improvement in thermal performance for upper-inlet countercurrent arrangement is significant. Placing the SFAS in the middle of the DMHSs ensures the best overall thermal performance.
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    Item type:Item,
    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.