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首页> 外文期刊>International Journal of Heat and Mass Transfer >Marangoni effect on microbubbles emission boiling generation during pool boiling of self-rewetting fluid
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Marangoni effect on microbubbles emission boiling generation during pool boiling of self-rewetting fluid

机译：Marangoni对自粘性液体池沸腾过程中微气泡排放沸腾产生的影响

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摘要

In order to clarify the Marangoni effect on microbubbles emission boiling (MEB) generation during the pool boiling of self-rewetting fluid (SRWF), a plenty of boiling experiments were carried out, which used heptanol aqueous solution as SRWF. A horizontal platinum wire was used as heated surface during the pool boiling experiments. Additionally, a high speed video camera was used to record the nucleation boiling process. The experimental results show that, the MEB phenomenon only appeared in the heptanol aqueous solution case. Due to the occurrence of MEB phenomenon, the 0.1 wt% heptanol aqueous solution shows much better critical heat flux (CHF) and heat transfer coefficient. Furthermore, the Marangoni effect was quantitatively analyzed combining dimensionless parameters of the thermal Marangoni number (Ma(T)) and solutal Marangoni number (Ma(S)). The results show that, the Marangoni convection along the vapor/liquid interface is the key factor to induce the MEB. Since the Marangoni number reaches about 3 x 10(6) when the MEB appeared, the Marangoni number of 3 x 10(6) should be the critical magnitude that induces the MEB phenomenon for 0.1 wt% heptanol aqueous solution in this case. (C) 2019 Elsevier Ltd. All rights reserved.
机译：为了弄清Marangoni对自润湿液体（SRWF）的池沸腾过程中微气泡排放沸腾（MEB）产生的影响，进行了大量的沸腾实验，其中使用庚醇水溶液作为SRWF。在池沸腾实验中，将水平铂丝用作加热表面。另外，使用高速摄像机记录成核沸腾过程。实验结果表明，MEB现象仅在庚醇水溶液中出现。由于发生了MEB现象，0.1 wt％的庚醇水溶液显示出更好的临界热通量（CHF）和传热系数。此外，结合了无量纲的热马兰戈尼数（Ma（T））和溶质马兰戈尼数（Ma（S））来定量分析马兰戈尼效应。结果表明，沿汽/液界面的Marangoni对流是引起MEB的关键因素。由于当出现MEB时Marangoni数达到约3 x 10（6），因此在这种情况下，对于0.1 wt％的庚醇水溶液，Marangoni数应为引起MEB现象的临界值3 x 10（6）。 （C）2019 Elsevier Ltd.保留所有权利。

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