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首页> 外文期刊>International Journal of Heat Exchangers >Study and Visualization of Droplet Entrainment from a Polymer Plate Heat Exchanger
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Study and Visualization of Droplet Entrainment from a Polymer Plate Heat Exchanger

机译：聚合物板式换热器中液滴夹带的研究和可视化

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摘要

Dropwise condensation and condensate droplet entrainment at the downstream end of a fully polymer compact heat exchanger made of PolyVinyliDene-Fluoride (PVDF) were studied for gas (air-steam) mixtures with a relatively high concentration of noncondens-ables. At high gas velocities, condensate drops may be taken away by the gas stream. These droplets may cause erosion of downstream equipment, and may reduce their heat and mass transfer performance. Experiments were conducted for various gas and coolant inlet temperatures, various air-steam mass flow rates and various inlet relative humidities. The main parameter affecting heat and mass transfer has been identified (inlet concentration). The main parameter affecting droplet entrainment is found to be the Weber number, We = ρ_(cond) v~2_(g'out)d_(plate)/σ, with a length scale d_(plate) that has been explored in a dedicated experiment. It is found that in practical applications, droplet entrainment can be avoided by keeping the Weber number less than 1.
机译：研究了由聚VinyliDene-Fluoride（PVDF）制成的全聚合物紧凑型热交换器下游端的逐滴冷凝和冷凝水液滴夹带，用于非冷凝物浓度相对较高的气体（空气-蒸汽）混合物。在高气体流速下，冷凝水可能会被气流带走。这些液滴可能导致下游设备的腐蚀，并可能降低其传热和传质性能。针对各种气体和冷却剂入口温度，各种空气蒸汽质量流量和各种入口相对湿度进行了实验。已经确定了影响传热和传质的主要参数（入口浓度）。发现影响液滴夹带的主要参数是韦伯数，我们=ρ_（cond）v〜2_（g'out）d_（plate）/σ，其长度尺度为d_（plate），已在专门研究中探讨过实验。发现在实际应用中，通过使韦伯数小于1可以避免液滴夹带。

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