水平管降膜蒸发器传热特性研究  

Heat Transfer Characteristics in Horizontal-Tube Falling Film Evaporators

作　　者：沈胜强[1] 梁刚涛[1] 刘晓华[1] 牟兴森[1] 刘瑞[1] 

机构地区：[1]大连理工大学辽宁省海水淡化重点实验室,辽宁大连116024

出　　处：《工程热物理学报》2012年第8期1391-1394,共4页Journal of Engineering Thermophysics

基　　金：辽宁省科学技术计划项目(No.2008220040);上海市科委科研计划项目(No.09DZ1200502);中央高校基本科研业务费专项资金(No.DUT10ZD109)

摘　　要：建立了水平管降膜蒸发和管内凝结传热实验台,通过对实验结果的归纳,获得了水平管降膜蒸发器总传热系数随喷淋密度、蒸发温度、传热温差和蒸汽入口流速的变化规律,以及管间距对传热特性的影响。结果表明,总传热系数随喷淋密度、蒸发温度的增大而增大,随传热温差的增大而减小,而蒸汽流速对传热系数影响较小;在本文研究的管间距范围内,当管间距为46.7 mm时,总传热系数最高。Two experimental platforms were set up to measure the heat transfer coefficient of horizontal-tube falling film evaporators. The effect of spray density, evaporating temperature, total temperature difference and inlet steam velocity on the overall heat transfer coefficient K is studied. Furthermore the impact of different tube pitches on the heat transfer characteristics is also presented. The results indicate that growth of spray density and evaporating temperature helps to increase the K. The K could also be increased by reducing the total temperature difference. However, the impact of the inlet steam velocity on the K is less significant. The K with tube-pitch of 46.7 mm is supreme in the present testing conditions.

关 键 词：水平管降膜蒸发器 蒸发 凝结 

分 类 号：P747.13[天文地球—海洋科学]