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中文摘要：
为实现无泵循环高效降膜蒸发换热，提出了基于蒸汽举送效应的新型复合降膜蒸发器。通过建立数学模型，针对管径的改变研究其水力特性和换热性能。结果表明：输运段管径的增加不仅提高了输送流量和高度比H/L（泵送高度与为克服管道阻力所需的浸没深度之比），而且强化了蒸发段的传热传质性能，提高整个系统的性能；而换热段管径的改变主要影响系统的传热传质性能，对输送段水力特性不产生影响。
英文摘要：
In order to realize high efficient falling film evaporation but without circulation pump, an innovative falling film evaporator combined with vapor-lift effect was proposed and the theoretical analysis to obtain the effect of tube diameter on the performance of the innovative evaporator were presented. Results indicate that with bigger tube in the transporting unit, both hydraulic performance of the transporting unit and heat and mass transfer performance of the falling film evaporating unit are improved. While the variety of tube diameter in the falling film evaporating unit only affects heat and mass transfer performance, it doesn＇t influence the hydraulic performance in the transporting unit.
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