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现代造水装置热交换器内部过程的强化在很大程度上取决于冷凝器的合理结构形式,在真空工作条件时它具有最大换热面。众所周知,在工业条件下蒸汽在换热面上冷凝时形成水膜。对造水装置冷凝器所用的工作热流密度为(35-90)×10~3千卡/米~2×小时,凝水的流动具有层流的特征,强化热交换的有效方法之一是采用小助型表面[1—4],这为减小凝水膜的热阻提供可能性。蒸汽在小肋表面上,特别是在管束上冷凝时热交换过程的研究过去不够充份。本文将叙述有关该过程的研究。
The enhancement of the internal processes of the heat exchangers in modern water-making plants depends to a large extent on the rational structure of the condenser, which has the largest heat transfer surface under vacuum working conditions. It is well-known that steam forms a water film when condensing on heat exchange surfaces under industrial conditions. The working heat flux (25-90) × 10 ~ 3 kcal / m ~ 2 × h for the condenser of the water making device has the characteristics of laminar flow and one of the effective methods for enhancing the heat exchange is to use Small help surface [1-4], which provides the possibility of reducing the thermal resistance of the condensate film. Research on the heat exchange process of steam on the surfaces of small ribs, especially on tube bundles, has not been adequate. This article will describe the research on this process.