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首页> 外文期刊>Journal of Heat Transfer >Visualization of Two-Phase Flows in Nanofluid Oscillating Heat Pipes
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Visualization of Two-Phase Flows in Nanofluid Oscillating Heat Pipes

机译：纳米流体振荡热管中两相流的可视化

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摘要

Two-phase flows in an oscillating heat pipe (OHP) charged with deionized (DI) water and a nanofluid (0.268% v/v) were experimentally investigated. The OHP was made of quartz glass tube (with an inner diameter of 3.53 mm and an outer diameter of 5.38 mm) and coated with a transparent heating film in its evaporating section. The internal two-phase flows at different heat loads were recorded by a charge-coupled device (CCD) camera. Only column flow was observed in the DI water OHP while in the nanofluid OHP the flow first was column, then slug and annular flows as the heat load was steadily increased. Heat transfer in the OHP was strongly related to the two-phase regime. The flow regime transitions effectively increased the operating allowable heat loads in the nanofluid OHP two- to threefold relative to the DI water OHP. The nanofluid OHP had a much lower thermal resistance than the DI water OHP with the most effective heat transfer in the nanofluid OHP occurring in the slug flow regime.
机译：实验研究了装有去离子水和纳米流体（0.268％v / v）的振荡热管（OHP）中的两相流。 OHP由石英玻璃管制成（内径为3.53毫米，外径为5.38毫米），并在其蒸发部分涂有透明的加热膜。电荷耦合器件（CCD）摄像机记录了在不同热负荷下的内部两相流。在去离子水OHP中仅观察到色谱柱流动，而在纳米流体OHP中，首先流动的是色谱柱，然后随着热负荷的稳定增加，团状和环形流动。 OHP中的热传递与两相状态密切相关。相对于去离子水OHP，流态转换有效地将纳米流体OHP中的允许工作热负荷提高了两倍至三倍。纳米流体OHP的热阻要比去离子水OHP低得多，而纳米流体OHP中最有效的传热发生在团状流态。

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