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arXiv 2103.13077physics.flu-dynphysics.app-ph
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一种改进传热传质性能的连续液滴冷凝新技术

A Novel Continuous Drop-Wise Condensation Technology for Improved Heat and Mass Transfer Efficiencies

Ali Alshehri, Jonathan P. Rothstein, H. Pirouz Kavehpour

摘要:

滴状冷凝是20世纪以来蒸汽冷凝技术研究的热点。DWC中冷凝速率的提高受到冷凝表面所能承受的最大液滴的限制。此外,不可冷凝气体(NCG)的存在显著降低了冷凝速率。在这里,我们提出了连续逐滴冷凝(CDC),以克服疏水表面的需要,同时保持微米级的液滴。通过将焦点从表面处理转移到清除液滴所需的力,我们能够利用射流冲击的滞止压力来调整脱落液滴的尺寸。结果表明,通过调节射流参数可以有效地调节脱落液滴的尺寸。我们的实验观察表明,利用我们的技术,NCG的影响大大减轻。与最先进的生物膜技术相比,传质致密性因子至少提高了六倍。

英文摘要:

Drop-wise condensation (DWC) has been the focus of scientific research in vapor condensation technologies since the 20th century. Improvement of condensation rate in DWC is limited by the maximum droplet a condensation surface could sustain. Furthermore, the presence of non-condensable gases (NCG) reduces the condensation rate significantly. Here, we present continuous drop-wise condensation (CDC) to overcome the need of hydrophobic surfaces while yet maintaining micron-sized droplets. By shifting focus from surface treatment to the force required to sweep off a droplet, we were able to utilize stagnation pressure of jet impingement to tune the shed droplet size. The results show that droplet size being shed can be tuned effectively by tuning the jet parameters. our experimental observations showed that the effect of NCG is greatly alleviated by utilizing our technique. An improvement by at least six folds in mass transfer compactness factor compared to state-of-the-art dehumidification technology was possible.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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