Hering Susanne V, Spielman Steven R, Lewis Gregory S
Aerosol Dynamics Inc., Berkeley, California, USA.
Aerosol Sci Technol. 2014 Jan 1;48(4):401-408. doi: 10.1080/02786826.2014.881460.
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.
本文提出了一种层流冷凝水的新方法，该方法能产生超过1.5的饱和度，同时在大部分气流中保持低于30°C的温度，并使出口露点低于15°C。采用原始的层流冷凝水方法时，颗粒活化和生长发生在整个壁面温暖且湿润的区域，这会产生加热气流的副作用。这里提出的“调节”方法用两个部分取代了这个温暖区域——一个短的、壁面温暖且湿润的“引发器”，接着是一个壁面凉爽的“调节器”。引发器提供产生过饱和状态的水蒸气，而调节器为颗粒生长提供时间。引发器和调节器部分的总长度与原来壁面温暖的生长部分相同。模型结果表明，这种新方法在实现相同的峰值过饱和度和相似的液滴生长的同时，减少了额外的热量和水蒸气。实验测量结果证实了模型预测的趋势。
