Dynamical mass‐transfer process of a CO2 bubble measured by using LIF/HPTS visualisation and photoelectric probing
Dynamical mass‐transfer process of a CO2 bubble measured by using LIF/HPTS visualisation and photoelectric probing
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DOI：
10.1002/cjce.20319
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发表时间：
2010-08
影响因子：
2.1
通讯作者：
Kodai Hanyu;T. Saito
中科院分区：
文献类型：
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作者：
Kodai Hanyu;T. Saito
利用激光诱导荧光/8-羟基芘-1，3，6-三磺酸（LIF/HPTS）技术，直接观测了CO2气泡（当量直径为2.9mm）向其周围液体的动态传质过程.利用粒子图像测速技术（PIV）对气泡浮力引起的周围液体运动进行了测量。此外，还利用新研制的光电光纤探针（POFP）直接测量了气泡尾流内CO2浓度分布。利用这三种测量技术的优势和互补性，我们讨论了传质过程与流动结构之间的关系。我们成功地在清晰地可视化对应的动态质量传递过程中从气泡到尾流和周围的液体（LIF/HPTS）的CO2丰富的区域。同时还得到了气泡尾流中CO2浓度的分布.结果表明：富CO2区形成马蹄形涡;尾流中心区CO2浓度最高，向尾流外缘逐渐降低;富CO2区被平流液相流（PIV）广泛输送到周围液体中。此外，我们讨论了新开发的POFP的性能和特点。
We directly visualised the dynamical mass-transfer process from a zigzagging rising CO 2 bubble (2.9 mm in equivalent diameter) to its surrounding liquid by using laser-induced fluorescence/8-hydroxypyrene-1, 3, 6-trisulfonic acid (LIF/HPTS). We measured the surrounding liquid motion induced by bubble buoyancy using particle image velocimetry (PIV). Further, the CO 2 concentration profile inside the bubble wake was measured directly by using a newly developed photoelectric optical fibre probe (POFP). Making the best and mutually complementary use of these three measurement techniques, we discuss the relationship between the mass-transfer process and the flow structure. We succeeded in clearly visualising CO 2 -rich regions corresponding with the dynamical mass-transfer process from the bubble to the wake and the surrounding liquid (LIF/HPTS). We also obtained a CO 2 concentration profile in the bubble wake (the POFP). It was found that the CO 2 -rich regions were formed into horseshoe-like vortices; the CO 2 concentration at the centre region of the wake was the highest, and the concentration decreased toward the outer edge of the wake; the CO 2 -rich regions were transported widely into the surrounding liquid by the advective liquid-phase flows (PIV). In addition, we discuss the performance and characteristics of the newly developed POFP.