双组分纳米流体强化氨水泡状吸收过程的特性分析  

Characteristic analysis of bubble absorption in ammonia-water binary nanofluids

作　　者：苏风民[1] 邓洋波[1] 高洪涛[1] 马鸿斌[1] 

机构地区：[1]大连海事大学轮机热能工程研究所,辽宁大连116026

出　　处：《热科学与技术》2013年第3期195-199,共5页Journal of Thermal Science and Technology

基　　金：国家自然科学基金资助项目(51006013);中央高校基本科研业务费专项资金资助项目(3132013021)

摘　　要：吸收式制冷系统因其可利用船舶上的各种低品位热能并采用环保型工质而成为一种重要的船舶节能环保技术。针对双组分(纳米流体对氨水泡状吸收过程的强化新方法开展研究,构建了氨水泡状吸收过程的热质传递模型。利用该模型分别分析了纳米流体的传热强化、传质强化及气泡尺度变化三者对氨水泡状吸收过程的影响规律。研究结果发现:模型计算结果与文献实验数据比较吻合;平均吸收速率随着有效传热系数的提高和气泡尺寸的减少,呈现线性增加的趋势;而随着有效扩散系数的提高,呈现非线性增加的趋势,增加的速率是逐渐下降的。Absorption refrigeration system has been paid more attention as an important method forenergy conservation and environmental protection of ships because it can be driven by low-level heat energy on ships and use green refrigerants. A mathematical model for ammonia bubble absorption was developed to analyze the mechanism of the binary nanofluid enhancing bubble absorption. The combined effects of nanoparticles on heat transfer, mass transfer, and bubble size in bubble absorption all were discussed utilizing the model. The results show that the model agrees well with experimental results. The average absorption rate increases linearly with the effective thermal conductivity of the binary nanofluid increasing and the bubble radius decreasing. When the effective mass diffusivity of the binary nanofluid increases, the average absorption rate increases, but its increasing rates decrease gradually. Presents a better understanding of the mechanism of the binary nanofluid enhancing bubble absorption in thermally-driven absorption refrigeration systems.

关 键 词：吸收制冷 纳米流体 模型 热质传递 

分 类 号：TQ025.3[化学工程]