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Instantaneous heat transfer rate around consecutive Taylor bubbles

机译：连续泰勒气泡周围的瞬时传热速率

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While many studies examine the hydrodynamics of two-phase gas-liquid slug flow, the details of the heat transfer mechanism of this flow regime remain largely unknown. Analyzing the detailed hydrodynamics around a single Taylor bubble provides a basis for understanding the heat transfer mechanism. Propagation of a single Taylor bubble is approximately steady; however, in undeveloped slug flow, acceleration and coalescence of consecutive bubbles is unsteady and highly complicated. The present study is aimed to investigate the effects of developing slug flow, particularly in the region where consecutive bubbles coalesce, on the instantaneous heat transfer for different flow regimes and heating locations. To enable controlled flow conditions, experiments were carried out for two consecutive Taylor bubbles rising in a vertical pipe. Measurements of the instantaneous heat transfer coefficient as a function of the leading bubble location were carried out for different separation distances between the two consecutive bubbles. These measurements were performed for various liquid flow rates, corresponding to laminar, transitional and turbulent background flow regimes. The experiments were conducted at several locations corresponding to different heating lengths. Furthermore, a comparison between the heat transfer coefficients of a bubble that has undergone coalescence with those corresponding to a single Taylor bubble with a similar length was performed. For all conditions, it was found that the heat transfer rate is augmented in the presence of an accelerated trailing bubble. The variation of the heat transfer rates is discussed with relation to the local flow hydrodynamics.
机译：尽管许多研究检查了气液两相流的流体动力学，但是这种流态的传热机理的细节仍然鲜为人知。分析单个泰勒气泡周围的详细流体力学，为理解传热机理提供了基础。单个泰勒气泡的传播大致稳定；但是，在不发达的团状流中，连续气泡的加速和聚结是不稳定的，并且非常复杂。本研究的目的是调查在不同流动方式和加热位置瞬时产生的团块流，特别是在连续气泡聚结的区域中，对瞬时传热的影响。为了使流动条件可控，对垂直管中连续上升的两个泰勒气泡进行了实验。对于两个连续气泡之间的不同分离距离，进行了根据传热气泡位置的瞬时传热系数的测量。这些测量是针对各种液体流速（对应于层流，过渡和湍流本底流动状态）进行的。实验在对应于不同加热长度的几个位置进行。此外，对已经合并的气泡的传热系数与对应于具有相似长度的单个泰勒气泡的传热系数进行了比较。对于所有条件，发现在存在加速尾随气泡的情况下，传热速率增加。讨论了传热速率的变化与局部流动流体动力学的关系。

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