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化工进展  2015 

绝热圆腔内4根冷热微管阵列振动强化传热实验

DOI: 10.16085/j.issn.1000-6613.2015.06.009

Keywords: 微管,振动,强化传热,微尺度,传热,对流

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Abstract:

目前针对微细管管外同时有自然对流和周期横向振动存在情况下的混合对流问题鲜有研究。为了探究这种现象,进而开发一种新型的换热器,本文提出了一种由4根冷热微细管组成的微管阵列,将其平行放置于有中间流体的圆形腔体内,并对管束施加微小横向振动的混合对流传热机理进行研究。详细描述了实验系统及实验方法,以及后期对实验数据的处理方法,得到了传热Nu数随管间自然对流强度Ra数,强迫振动Rev数等量纲为1参数的变化曲线;揭示了该结构形式下传热特性随冷热管温差、振动频率、微管振幅等传热规律。结果表明,横向振动在小温差情况下传热强化效果更为明显。将本文实验数据与Lemlich单管振动实验中的数据进行对比,表明了振动对4根微管阵列的强化传热效果比单根管更明显。

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