Moderated, Water-Based, Condensational Particle Growth in a Laminar Flow.

Moderated, Water-Based, Condensational Particle Growth in a Laminar Flow.
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层流中调节的,水性的冷凝颗粒生长。

DOI:
10.1080/02786826.2014.881460
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发表时间:
2014-01-01
期刊:
Aerosol science and technology : the journal of the American Association for Aerosol Research
影响因子:
--
通讯作者:
Lewis GS
Lewis GS
中科院分区:
其他
文献类型:
--
作者:
Hering SV;Spielman SR;Lewis GS

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提出了一种层流水冷凝的新方法,该方法在使大部分流动的温度保持在30°C以下的同时产生1.5以上的饱和度,并提供低于15°C的露点。在原始的层流冷凝方法中,颗粒的激活和生长发生在整个具有温暖湿墙的区域,这具有加热流动的副作用。这里提出的“缓和”方法用两个部分取代了这个温暖的区域--一个短的、温暖的、湿壁的“启动器”,然后是一个冷壁的“慢化器”。引发剂提供产生过饱和度的水蒸气,而慢化剂提供颗粒生长的时间。引发剂和慢化剂部分的组合长度与原始的温壁生长部分的长度相同。模型结果表明,这种新的方法减少了增加的热量和水蒸气,同时实现了相同的峰值过饱和度和相似的液滴生长。实验测量证实了模型预测的趋势。
Presented is a new approach for laminar-flow water condensation that produces saturations above 1.5 while maintaining temperatures of less than 30°C in the majority of the flow and providing an exiting dew point below 15°C. With the original laminar flow water condensation method, the particle activation and growth occurs in a region with warm, wetted walls throughout, which has the side-effect of heating the flow. The “moderated” approach presented here replaces this warm region with a two sections – a short, warm, wet-walled “initiator”, followed by a cool-walled “moderator”. The initiator provides the water vapor that creates the supersaturation, while the moderator provides the time for particle growth. The combined length of the initiator and moderator sections is the same as that of the original, warm-walled growth section. Model results show that this new approach reduces the added heat and water vapor while achieving the same peak supersaturation and similar droplet growth. Experimental measurements confirm the trends predicted by the modeling.
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