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首页> 外文期刊>International Journal of Heat and Mass Transfer >Periodicity and bifurcations in capillary tube boiling with a concentric heating wire
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Periodicity and bifurcations in capillary tube boiling with a concentric heating wire

机译：同心加热丝在毛细管沸腾中的周期性和分叉

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摘要

Nucleate boiling from a vertical glass capillary in a pool of water is investigated here. Electrical heating is provided with a wire passing concentrically through the center of the capillary, and a fast-response thermocouple at the lip of the capillary records the instants of bubble departure. Different lengths and diameters of capillaries are used in the experiments. The average frequency of bubbling is seen to increase with applied heat flux, the relation being linear in the initial stages. With the heat flux used as a bifurcation parameter, one-dimensional return maps of the time interval between successive bubble emission events are used to study the transitions from the periodic state. The first bifurcation from the periodic to a two-period state is observed to be due to lateral instability of the liquid film adhering to the capillary wall. Further bifurcations to period two and then to period three bubbling are also observed. Simplified analysis of the different phases of the boiling process yields solutions which show close agreement with the experimental data.
机译：在此研究了池中垂直玻璃毛细管中的核沸腾。通过一根同心地穿过毛细管中心的电线来进行电加热，并且在毛细管唇口处的快速响应热电偶记录气泡离开的瞬间。实验中使用了不同长度和直径的毛细管。可以看到，鼓泡的平均频率随着施加的热通量而增加，在初始阶段该关系是线性的。将热通量用作分叉参数，连续气泡发射事件之间的时间间隔的一维返回图用于研究从周期性状态的跃迁。观察到从周期状态到两周期状态的第一分叉是由于粘附在毛细管壁上的液膜的横向不稳定性所致。还观察到到第二周期再到第三周期冒泡的进一步分叉。对沸腾过程不同阶段的简化分析得出的溶液与实验数据非常吻合。

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