{"title":"Free convection characteristics in a vertical minichannel with two grooves","authors":"Eunpil Kim","doi":"10.33422/researchconf.2019.12.897","DOIUrl":null,"url":null,"abstract":"Free convection characteristics are investigated in a vertical minichannel with two grooves. The wall geometry of the minichannel has grooved shapes with several modified groove ratios. To find the effects of natural convective heat transfer, the finite volume numerical method is used. For the case of two grooves, there are four flow separations at d/D = 0.5. Heat transfer patterns are similar to the single groove case. However, at the ending section of the first groove temperatures spread out to the downstream. In the case of the 1 mm distance case between grooves, the Nusselt number shows larger variation compared to the other cases. When the channel pitch is 3 mm, the position location between grooves is not a large factor after 2 mm groove distance.","PeriodicalId":346784,"journal":{"name":"Proceedings of The International Conference on Research in Engineering and Technology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2019-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Proceedings of The International Conference on Research in Engineering and Technology","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.33422/researchconf.2019.12.897","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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Abstract
Free convection characteristics are investigated in a vertical minichannel with two grooves. The wall geometry of the minichannel has grooved shapes with several modified groove ratios. To find the effects of natural convective heat transfer, the finite volume numerical method is used. For the case of two grooves, there are four flow separations at d/D = 0.5. Heat transfer patterns are similar to the single groove case. However, at the ending section of the first groove temperatures spread out to the downstream. In the case of the 1 mm distance case between grooves, the Nusselt number shows larger variation compared to the other cases. When the channel pitch is 3 mm, the position location between grooves is not a large factor after 2 mm groove distance.
研究了双沟槽垂直小通道内的自由对流特性。微型通道的壁面几何形状具有若干修正的沟槽比的沟槽形状。为了研究自然对流换热的影响，采用了有限体积数值方法。对于两个凹槽的情况，在d/ d = 0.5时有四个流动分离。传热模式类似于单槽壳体。然而，在第一槽的末端，温度向下游扩散。在凹槽之间距离为1mm的情况下，与其他情况相比，努塞尔数显示出更大的变化。当槽距为3mm时，槽距为2mm后槽间的位置位置影响不大。
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