热力蒸汽再压缩水平管降膜蒸发器的设计计算

本文对水平管降膜蒸发器组成的热力蒸汽再压缩蒸发装置进行了研究,得到了小温差下该装置的操作性能及计算方法。     

热泵式蒸发系统及其节能分析

介绍了根据热泵原理研制成功的一种高度节能的新型蒸发系统——热泵式蒸馏水生产装置的设计思想,并用焓分析法对新型蒸馏水机与传统的蒸馏水器作了能量分析,论证节能的原因,又用(火用)分析法对新型蒸馏水机作了能量计算.最后对其焓流图和(火用)流图进行比较,进一步阐明(火用)分析法的科学性.     

A NEW METHOD FOR ACHIEVING DROPWISE CONDENSATION (Ⅱ) NEW SURFACE MATERIALS FOR DROPWISE CONDENSATION

Technology of ion-plating and ion-beam mixing was employed to prepare surface alloys on copper tubes. Elements chosen for the purpose are Cr, Fe, Al, N, Bi, Sb, Sn, Se and In. Excellant dropwise condensation of steam was then obtained on some external surfaces of these copper tubes and the mechanism for the dropwise condensation was analysed.The surface characteristics of the Cu-Cr and Cu-Fe alloy layers were analysed by using XPS, AES and AES-PRO of PHI-550 multiple function electron spectroscopy.     

垂直管降膜蒸发传热系数的数学模型

本文在前人工作基础上,利用边界层动量、热量和质量方程,对降膜流动综合考虑相间剪力和由于表面张力所引起的涡流扩散阻尼因素,建立了流动和传热的数学模型,并用计算机求得液膜的速度分布、温度分布、液膜乎和传热系数。模型计算值与本文实验值及前人曲实验值间能较好地吻合。作者还编制了计算机程序,希望为工业设计起参考作用。     

引入蒸汽对垂直管内降膜蒸发传热及流动的影响

对垂直管内引入饱和蒸汽的湍流降膜蒸发传热及流动进行实验研究。研究结果表明:管内引入饱和蒸汽,可以在不提高液膜传热温差的情况下,提高传热系数12％～25％,降低液膜厚度10％～20％,并得出相应的计算式。     

A NEW METHOD FOR ACHIEVING DROPWISE CONDENSATION (Ⅰ) BASIC CONCEPT AND EXPERIMENTAL RESULTS

Various methods for achieving dropwise condensation (DWC) are reviewed from the point of view of surface science. The objective of the present work is stated. In the experimental study, the surfaces of stainless steel and copper tubes employed were treated with various surface techniques, steam condensation under atmospheric pressure was carried out and steady DWC observed on these surfaces, and the mechanism of DWC formation on the treated surfaces was analysed. Experimental results and photographs of DWC are presented.     

垂直管降膜蒸发器的传热研究

在接近工业应用的条件下,热通量为10～80kW/m~2、蒸发温度为80～100℃、料液雷诺数在2000～10.000范围内.在内径为22mm、长为4m的紫铜管内,测定了蒸汽加热的垂直管内降膜蒸发传热系数,并进行了传热系数试验关联。     

A NEW METHOD FOR ACHIEVING DROPWISE CONDENSATION (Ⅲ) DETERMINATION OF DROPWISE CONDENSATION HEAT TRANSFER COEFFICIENT AND LIFETIME TEST OF THE NEW SURFACE

Heat transfer characteristics of the new surfaces were determined through temperature measurements, and the results were compared with dropwise condensation (DWC) studies from various sources.Duration tests for DWC were carried out on two different surfaces, giving a duration of perfect DWC over 15000 hours.     

填充床电渗析器制备纯水的研究

本文介绍了离子交换树脂在填充床电渗析器中的脱盐及电再生机理，实验研究了一价离子及二价离子在设备内的操作参数。一价离子与二价离子相比，树脂使用周期长，操作范围宽，对于一价离子，树脂可在低电压下（〈２５Ｖ）再生，在较高电压下（〉２５Ｖ），树脂内的一价离子及二价离子均可再生。操作电流应略大于极限电流，以保护产水质量。     

实现滴状冷凝新途径的研究——(Ⅲ)滴状冷凝传热系数的测定和寿命实验

采用直接测温的方法,测定了新表面材料的滴状冷凝传热特性,并同国外滴状冷凝传热研究的结果进行比较.分析讨论了Cu-Cr表面和机械抛光表面传热性能的差异.对Cu-Cr和机械抛光两种表面进行了寿命实验,滴状冷凝现已超过8500小时.