共查询到20条相似文献,搜索用时 125 毫秒
1.
2.
3.
HFC混合物二元交互作用系数研究 总被引:5,自引:0,他引:5
目前国际上已商业化使用或提出的潜在的环保工质,大多数为氢氟烃(HFC)混合物,利用状态方程描述混合工质热力性质时,交互作用系数是重要参数之一。本文应用Peng-Robinson状态方程对多种HFC二元混合物的气液相平衡(vapor—liquid equilibrium,VLE)实验数据进行了回归,得到了相应混合物的交互作用系数。提出了交互作用系数新关联式,结果表明所得到的交互作用系数能很好的应用于描述HFC混合物气液相平衡性质,计算精度可以满足工程应用的需要。 相似文献
4.
〈正〉本文使用通用对应态方程,即修正的LKZX方程和WST混合法则建立了一套计算半连续混合物的汽液相平衡数值方法。 相似文献
5.
水平管内相积存造成深冷混合工质变浓度分析 总被引:1,自引:0,他引:1
因多相流动中汽液速度差而造成相积存(Holdup)是深冷混合工质节流制冷系统中混合物浓度偏析的一个重要因素。本文建立了因相积存造成浓度变化的计算模型,在随管长存在分布热负荷(受热或冷却)情况下,考查了水平直管内深冷多元混合物因汽液相积存造成的循环浓度偏析情况。 相似文献
6.
7.
最近,连续热力学得到发展。本文陈述气液相平衡连续热力学。并用通用高斯-拉盖尔数值求积方法计算了一个半连续混合物。 一、连续、半连续混合物及其密度函数的表示 对于连续混合物,组份分数用F(I)△I表示。归一化条件为 相似文献
8.
9.
《工程热物理学报》2016,(1)
本文采用汽液双循环法测量了新型环保制冷剂R134a+DME在(253.15~273.15)K时的汽液相平衡数据。所测实验数据采用PR+LCVM+Wilson模型进行了关联,汽相组分的平均绝对误差绝对值为0.0043,最大绝对误差绝对值为0.0222;体系压力的平均相对误差绝对值为0.65%,最大相对误差绝对值为1.05%。关联结果和实验数据一致性较好,说明此模型能很好地描述该体系在实验条件下的汽液相平衡数据。从实验结果发现,R134a+DME是一种共沸制冷剂,处于共沸点时R134a摩尔组分0.4左右,而且该混合物在整体组分变化范围内的温度滑移也非常小。 相似文献
10.
混合制冷剂的相互作用系数是制冷空调应用中建模和计算制冷剂热力性质所需的一个重要参数,本文利用大量的汽液相平衡实验数据结合LKP方程进行了热力学关联,提出了适合于计算HFCs混合制冷剂的相互作用系数的一种算法,求取的相互作用系数用于汽液相平衡和循环分析计算具有较高精度,与实验数据或其他热力模型计算结果吻合情况良好. 相似文献
11.
12.
13.
14.
Competitive and synergistic adsorption of binary volatile organic compound mixtures on activated carbon 下载免费PDF全文
《中国物理 B》2019,(2)
The adsorption of four substances and their binary mixture is investigated via the terahertz time domain spectroscopy(THz-TDS). The selected unary compound(ethanol, acetone, ethyl acetate, and n-propyl acetate) and binary mixture(solution 1 is composed of ethanol and acetone, and solution 2 is composed of ethyl acetate and n-propyl acetate) exhibit different adsorption behaviors with varied polarities. In comparison with single component, solution 1 shows shorter adsorption equilibrium time, faster adsorption rate, and stronger adsorption capacity, which conform to a synergistic adsorption mechanism, while the competitive behavior is attributed to the slower adsorption in solution 2. In addition, the pseudo-second-order equation with terahertz parameter is used to assess the rate of binary component organics. The present results indicate a further understanding of multicomponent adsorption mechanisms. 相似文献
15.
多元混合工质的相平衡特性是复杂且重要的问题之一。文中综述了国内外多组分介质相平衡的理论研究现状,包括状态方程和混合规则的改进、活度系数模型的研究以及对特定体系计算方法的研究等。并总结了适用于低温下尤其是针对天然气组分的相平衡计算方法。 相似文献
16.
17.
18.
A. Ermakova A. M. Chibiryaev I. V. Kozhevnikov V. I. Anikeev 《Russian Journal of Physical Chemistry B, Focus on Physics》2009,3(7):1044-1061
The paper presents mathematical models and calculation methods for solving particular research problems related to the thermodynamic
characteristics of multicomponent and multiphase mixtures. The special features of chemical and phase equilibria in such mixtures
are considered in the ideal gas approximation and taking nonideality into account. The conditions of equilibrium phase stability
are studied for multiphase systems. The results of calculations of characteristic phase diagrams and binodal and spinodal
are given for model systems with a fixed chemical composition, and a new interpretation of the mathematical model for localizing
the critical point of a multicomponent mixture with a given composition is presented. A new interpretation of the well-known
classic homotopy method is suggested for solving complex nonlinear systems of equations. Some anomalies of phase portraits
and critical curves that are necessary to take into account in selecting (planning) experimental conditions and calculating
chemical processes and reaction parameters are considered separately. The possibility of calculating thermodynamic and thermophysical
properties (entropy, enthalpy, heat capacity, heat effects of reactions, and adiabatic heating) is demonstrated for the example
of particular multicomponent nonideal mixtures. The conclusion is drawn that cubic equations of state can be used for predicting
the deviations of these properties from the ideal gas state and their anomalies in the vicinity of the critical points of
mixtures. 相似文献
19.