有限空间内印刷废气的扩散特性

印刷工程论文编号:YS055  论文字数:10078.页数:32

目  录
中文摘要 I
英文摘要 III
目录 Ⅴ
1. 绪论 1
 1.1 印刷过程产生的废气污染概述 1
 1.2 分析印刷过程中产生有害气体的情况，确定本文研究对象 2 
 1.3 气体扩散模型的概况 3
 1.4 影响气体扩散的因素的研究及分析 5
      1.5 本文的研究目标及内容 6
2. 气体扩散模拟软件FLUENT概述 7
 2.1 FLUENT软件简介 7
 2.2 FLUENT数值模拟 7
 2.3 本章总结 8
3. 气体扩散模拟的数学模型和数值方法 9
 3.1 数学模型 9
 3.1.1 基本假设 9
 3.1.2 基本控制方程 9
 3.2 湍流模型 9
 3.3 数值方法 9
 3.4 本章总结 14
4．有限空间内甲苯气体的数值模拟及分析 15
 4.1 利用FLUENT软件建立立体长方体模型 15
 4.2 设置相关参数，进行甲苯气体扩散数值模拟计算 16
 4.3 截取FLUENT软件数值模拟时的相关图片并进行分 18
 4.4 本章总结 23
5. 结论 24
致谢 25
参考文献 26

摘 要：目前环境污染日益严重，典型油墨挥发气体的有机挥发物和毒性越来越得到人们的关注，这些印刷废气的扩散特性值得深入的研究。在这样的背景下，国际上逐渐兴起了对有害气体扩散问题的研究，而这些研究又带来了扩散模式和数学模拟等理论的不断创新和迅速发展。近年来，伴随着计算机技术的高速发展，研究者们把先进的计算机技术运用到数值模拟领域，开发出了多种实用的数值模拟软件，其中FLUENT软件就是被广泛应用在传热和流动领域的数值模拟软件。本文针对有限空间内的印刷废气的扩散，运用FLUENT软件对其扩散过程进行了数值模拟，得到印刷废气的不同时间的空间分布，扩散方向和浓度分布状况，并且分析了扩散过程中的一些特殊现象，这对印刷废气的相关排放的设计提供了可借鉴的指导意见。本文的主要内容和结论主要是：
 （1）参考相关文献和资料，分析印刷过程中产生的废气的主要成分。并且确定要研究的对象，同时介绍气体扩散模型的发展概况和气体扩散的影响因素。
 （2）介绍气体扩散模拟软件的发展概况，阐述FLUENT气体扩散模拟软件概况和数值模拟两方面内容。
 （3）了解气体扩散模拟的数学模型和数值方法。
 （4）结合上述的数学模型，利用FLUENT软件对有限空间长方体内的甲苯气体的扩散进行数值模拟，并且根据数值模拟计算的结果，截取相关的分布图形，讨论模拟长方体内的甲苯气体的时空分布，浓度分布特点，气体扩散方向等。
关键词：有限空间；气体扩散；数值模拟；浓度分布

Abstract: At present, the environmental pollution is turning worse , the organic volatile compound and toxic gas of typical ink volatile gas has been more attention, the diffusion characteristics of these printing emissions is worth in-depth studying. In this context, the international gradually rises interesting of proliferation of harmful gas researching, and these studies bring continuous innovation and fast developing in diffusion model and the theories of mathematical modeling. In recent years, along with the rapid development of computer technology, researchers use the advanced computer technology to the field of numerical simulation and develop a variety of useful numerical simulation software, and the FLUENT is one kind of software that widely used in the field of heat transfer and flow numerical simulation. For the exhaust of the diffusion of printing in the limited space, this article uses FLUENT software for its diffusion process simulation, gets the space distributing of printing emissions at the different time, realizes the pervasion direction and concentration distribution, and analyses some special phenomena in the diffusion process, it gives the effective guidance to the design of exhaust-related emissions . The main contents and conclusions of this article:
 (1) Refer to the relevant literature and data, analysis of the main ingredient of printing process emissions. And confirms the targets for investigation, introduces the development profiles of gas diffusion model and the effect factors of gas diffusion.
 (2) Describe the development survey of gas diffusion model software, expatiates two aspects about the gas diffusion simulation software of the FLUENT and the numerical simulation.
 (3) Understand the mathematical model of gas diffusion simulation and numerical methods.
 (4) Combine the mathematical model which mentions above , uses FLUENT software to numerically simulate gas diffusion about the toluene within the limited rectangular space numerical simulation, and bases on the results of numerical simulation, intercepts the related distribution graphics, discusses the temporal distribution, concentration distribution, diffusion direction of toluene gas in the rectangular spatial.
Keywords: Limited Space; Diffusion of Gases; Numerical Study; Concentration Distribution