二元冰输送过程的摩阻与传热特性研究

【作者】 魏娟；

【导师】 章学来；

【作者基本信息】 上海海事大学 ， 制冷及低温工程， 2005， 硕士

【摘要】 二元冰是一种有效的空调蓄冷和输送冷量的介质,有着广阔的应用前景。而二元冰的流动摩阻和传热性能的研究又是将二元冰介质应用于实际工程的最为重要的基础资料。近几年,国外对二元冰流体展开了多角度的研究分析,其中包括对二元冰流体流态、粘性、流动阻力、换热性能的研究,但是大部分的内容都集中在实验研究上。本文运用数值分析的手段,对二元冰在水平管道中的流动和传热性能进行了数学分析,同时对二元冰在空调末端装置风机盘管的应用进行研究,得出了盘管中水侧摩阻的宏观数学模型,具体来说,本文的内容主要包括以下几个方面: 1.概述了国内外二元冰的研究情况及研究二元冰的意义; 2.介绍本试验所用二元冰制备试验台; 3.对水平管道中二元冰的流动摩阻进行理论和实验研究; 4.对风机盘管的流动和换热特性进行研究,分析了二元冰流速、含冰率对于风机盘管性能的影响。 5.在传统液固两相流的研究成果基础上,建立起二元冰在水平管内换热的数学模型,同时针对二元冰在风机盘管中的输送情况,分析了输送速度、含冰率对于二元冰换热的影响;更多还原

【Abstract】 Ice slurry is an affective media in energy storage an transportation for air conditioning .which has broad prospects. The flowing characteristics and heat transfer performance of ice slurry are the most fundamental data for its putting into use. Since mid-1990s ice slurry becomes the hot point of foreign researchers, who carrying their researches on different aspects of ice slurry, including its rheology, viscosity, pressure drop characteristics and heat transfer performance. However, the preceding researches are mostly experimental, therefore, the results are more or less limited in the practical way. In this thesis, theory and numerical studies as well as experiments have been carried out, which including the following details:1. Described the common employed methods for the producing of ice slurry and introduced the signification of researched ice slurry2. Established a physical model of ice slurry flowing in horizontal pipes on the base of traditional liquid-solid theories. Discussed the effects of transportation speed on the distribution of ice particles in a circular tube as well3. Analyzed all kinds of effects on the pressure drop. Finally, draw the mathematical model of pressure drop4. Analyzed the effects of flow and ice packing fraction on pressure drop of fan and coil5. Based on the theoretical of ice slurry phase flow and heat transfer, established a heat transfer model of ice slurry flowing in horizontal pipes, at same time analyzed the effects of flow and ice packing fraction on heat transfer of fan and coil更多还原