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首页> 外文期刊>International Journal of Heat and Mass Transfer >Superhydrophobic fins with inclined arrangement for enhancing energy saving of air-cooled wet heat exchangers
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Superhydrophobic fins with inclined arrangement for enhancing energy saving of air-cooled wet heat exchangers

机译：具有倾斜布置的超疏水翅片，用于增强风冷湿式热交换器的节能

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摘要

The energy consumption of the air-cooled heat exchangers such as evaporators operating under wet conditions is much higher owing to the condensate retention and bridging. The retained condensates and condensate bridging could narrow down the free airflow passage in the fin side and can adversely increase the airside pressure drop, which raises the fan power consumption. Effective condensate drainage can minimize the fan power consumption in such thermal management systems. Accordingly, this work proposes a superhydrophobic heat exchanger with an inclined fin arrangement that can effectively remove condensates and minimize the airside pressure drop. In this work, the departure droplet diameter of the untreated and superhydrophobic surfaces is predicted using the force balance analysis. A rationally based correlation is proposed to describe the condensate shedding ability of the different fin surfaces through dimensionless analysis. It is found that the departure droplet diameter of the superhydrophobic surfaces is almost 90% smaller than that of the untreated surfaces. The superhydrophobic fins offered remarkable condensate shedding characteristics. Consequently, the superhydrophobic heat exchangers with inclined fins provided a pressure drop reduction of up to 70%. The effect of inclination angle and the superhydrophobic coating on the heat transfer rate is negligible.
机译：由于冷凝水保持和桥接，风冷的热交换器（如蒸发器）的能量消耗诸如在湿条件下操作的蒸发器。保留的冷凝物和冷凝水桥接可以缩小翅片侧的自由气流通道，并且可以不利地增加空气侧压降，从而提高风扇功耗。有效的冷凝水排放可以最小化这种热管理系统中的风扇功耗。因此，该工作提出了一种具有倾斜翅片布置的超疏水热交换器，其能够有效地除去冷凝物并最小化空气侧压降。在这项工作中，使用力平衡分析预测未处理和超疏水表面的出发液滴直径。提出了一种合理的相关性来描述通过无量纲分析的不同翅片表面的冷凝物脱落能力。结果发现，超疏水表面的出发液滴直径几乎比未处理的表面小90％。超疏水翅片提供了显着的冷凝物脱落特性。因此，具有倾斜翅片的超疏水热交换器提供高达70％的压降降低。倾斜角度和超疏水涂层对传热速率的影响可忽略不计。

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