Development of a Database System for the Thermophysical Properties of Fluid Mixtures

为了尽快向科技界提供最新、最可靠的流体热物性数值数据，1981年设计并建立了一个新的数据库系统。该数据库收录了340种纯流体在7种方便物理状态下的12种性质数据。该系统的一个显著特点是提供了一个由10种检索例程组成的检索系统。自1981年以来，该数据库已向公众开放。从流体混合物数据的工业重要性出发，本工作计划将该数据库系统扩展到混合物。一年来取得的成绩主要有：1)混合料属性数据的选择与输入…热力学性质，如密度、压缩系数、二元混合物的比热，是在对现有数据进行关键评估后输入的。2)混合规则的选择…为了弥补混合材料实验数据的不足，研究了各种混合规则，从现有的纯组分数据中计算混合材料的性质。输入近30条规则，设计程序从中选择合适的公式。3)对现有流体混合物数据库的结构和功能进行了系统的综合评价。

A new database system was designed and constructed in 1981, in order to provide the newest and most reliable numerical data on thermophysical properties of fluids to the scientific and technical community as quickly as possible. The database was concerned with 12 kinds of property data of 340 pure fluids under all conditions of 7 convenient physical states. One of distinguishing features of the system is to provide a retrieval system consisting of 10 kinds of retrieval routines. Since 1981, the database has been opened to the public.From the industrial importance of data of fluid mixtures, the present work was planned to expand this database system to mixtures. The accomplishments in this year are summarized as follows:1) Selection and input of property data for mixtures ... Thermodynamic properties, such as density, compressibility factor, specific heat of binary mixtures, have been input after the critical evaluation of existing data.2) Selection of the mixing rules ... In order to cover the lack of experimental data for mixtures, various mixing rules are examined to calculate the properties of mixtures from the available data of pure components. Nearly 30 rules are input and a program is designed to select the appropriate formulas among them.3) The comprehensive evaluation of the complete system has been made concerning to the structure and the functions of the present database for fluid mixtures.