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首页> 外文期刊>Journal of enhanced heat transfer >EXPERIMENTAL INVESTIGATION OF THE EFFECT OF DIMENSIONS ON NUCLEATE BOILING HEAT TRANSFER IN STRAIGHT TUNNEL-STRUCTURED BOILING SURFACES
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EXPERIMENTAL INVESTIGATION OF THE EFFECT OF DIMENSIONS ON NUCLEATE BOILING HEAT TRANSFER IN STRAIGHT TUNNEL-STRUCTURED BOILING SURFACES

机译：尺寸对直隧道结构沸点核沸腾热传递效应的实验研究

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Pool boiling experiments were carried out to investigate tunnel width, pore, and height size effects on boiling heat transfer and to determine the performance of surfaces in different ranges of heat fluxes by using distilled water under atmospheric conditions. Also, the behavior of nucleation of vapor bubbles was observed. The nine structured surfaces, which have the same fin thickness (2.0 mm) but different tunnel width and height, and pore diameter, were developed for enhancement of boiling heat transfer. Also, a structured surface having 3.0 mm tunnel width without pores was investigated to observe pore effect. In order to investigate tunnel height, four surfaces with the same pore diameter and tunnel width, but various tunnel height values, were also used. In addition, it was considered that pore structures would help for fluid transition along the channels to increase the bubble frequency (nucleation, growing and leaving periods). Although a surface whose tunnel width is 1.0 mm can be considered best due to higher heat transfer area and providing more active nucleation sites, it was observed that vapor bubbles could hardly release throughout the tunnel, especially at high heat fluxes. Even though pore size is very significant for fluid transition during boiling and pores are needed for suction-evaporation operational mode for surface structure, it was observed that pores decrease the active nucleation sites because pore internal surfaces are not suitable places for nucleation.
机译：进行池沸腾实验，以研究隧道宽度，孔和高度尺寸对沸腾热传递的影响，并通过在大气条件下使用蒸馏水来确定不同范围的热量范围的表面的性能。而且，观察到蒸汽泡的成核的行为。开发了九个结构表面，其具有相同的翅片厚度（2.0mm）但隧道宽度和高度以及孔径不同，以提高沸腾热传递。而且，研究了没有孔的3.0mm隧道宽度的结构化表面以观察孔隙效应。为了调查隧道高度，还使用具有相同孔径和隧道宽度，但隧道高度值的四个表面。此外，考虑到孔结构将有助于沿着通道的流体过渡以增加气泡频率（成核，生长和离开时段）。尽管由于较高的传热面积并且提供更多的活性成核位点，但隧道宽度为1.0mm的表面可以被认为是最佳的，但是观察到蒸汽气泡很难在整个隧道中释放，尤其是在高热量通量下。尽管孔径对于沸腾的流体过渡是非常重要的，但是对于表面结构的吸入蒸发操作模式需要沸腾，因此观察到孔隙减少活性成核位点，因为孔内表面不是用于成核的合适的地点。

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