A Fundamental Equation for Water Covering the Range from the Melting Line to 1273 K at Pressures up to 25 000 MPa
A Fundamental Equation for Water Covering the Range from the Melting Line to 1273 K at Pressures up to 25 000 MPa
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DOI：
10.1063/1.555836
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发表时间：
1989-10
影响因子：
4.3
通讯作者：
A. Saúl;W. Wagner
中科院分区：
文献类型：
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作者：
A. Saúl;W. Wagner
为了表示在现有状态方程未涵盖的极大温度和压力范围内水（H₂O）的热力学性质，已经开发了一个新的基本方程。亥姆霍兹函数拟合了以下各类实验数据：(a) pρT数据，(b)饱和曲线的热性质（ps，ρ’，ρ‘），(c)声速w，(d)等压热容cp，(e)等容热容cv，(f)内能u的差值，(g)焓h的差值，(h)焦耳 - 汤姆逊系数μ，以及(i)等温节流系数δT。一种新的统计选择方法被用于从一个包含630项的“库”中确定方程的最终形式，其中还包含以前未使用过的函数形式。这个有58个系数的方程涵盖了从熔点线到1273 K、压力高达25000 MPa的整个流体区域，并且在“困难”区域也能在实验精度范围内表示数据……
In order to represent the thermodynamic properties of water (H2O) over an extremely large range of temperature and pressure that is not covered by existing equations of state, a new fundamental equation has been developed. The Helmholtz function was fitted to the following kinds of experimental data: (a) pρT data, (b) thermal properties of the saturation curve (ps,ρ’,ρ‘), (c) speed of sound w, (d) isobaric heat capacity cp, (e) isochoric heat capacity cv, (f) differences of the internal energy u, (g) differences of the enthalpy h, (h) Joule–Thomson coefficient μ, and (i) the isothermal throttling coefficient δT. A new statistical selection method was used to determine the final form of the equation from a ‘‘bank’’ of 630 terms which also contained functional forms that have not been previously used. This 58‐coefficient equation covers the entire fluid region from the melting line to 1273 K at pressures up to 25 000 MPa, and represents the data within their experimental accuracy also in the ‘‘difficult’’ r...