Thesis
A Generalized Helmholtz Energy Functional Form for Thermodynamic Properties of Binary Mixtures Containing Hydrogen, Neon, and Helium
Washington State University
Master of Science (MS), Washington State University
2016
Handle:
https://hdl.handle.net/2376/101815
Abstract
Cryogenic binary mixtures in the liquid phase are one of the remaining classes of mixtures to be extensively modeled. This is due to the difficulty in determining the quantum effects on the fluid system and the extreme temperatures required for experimental characterization. Advances in the ability to explore deep space and use cryogenic mixtures for renewable energy create a demand to increase understanding of cryogenic binary mixtures. Most research in this area was conducted prior to 1980 and modeling capabilities have advanced considerably since that time. With current technology, it is possible to create an accurate model of cryogenic mixtures in all phases of the system. This work presents a generalized Helmholtz thermodynamic property model used to represent cryogenic binary mixtures. This model is applied to the hydrogen/helium, and neon/hydrogen systems and represents the first ever pressure-density-temperature-composition experimental measurements for both systems. The hydrogen/helium uncertainty for weighted experimental measurements in the vapor and liquid phases are 1.09 % and 4.24 % respectively. The thermodynamic property model is valid for all experimental measurements ranging from 14 K to 33 K and pressures up to 11 MPa. The extrapolation method was based on in-depth property analysis using the REFerence Fluid thermodynamic and transport PROPerties (REFPROP) database and by comparisons made of second cross virial coefficients found in literature versus those calculated using the equations of state (EOS) presented. The extrapolation range was determined to be to 1000 K and 750 MPa for all compositions. The neon/hydrogen uncertainty for experimental measurements in the vapor and liquid phases are 3.34 % and 1.10 % respectively. The EOS is valid for all experimental measurements ranging from 24.59 K to 42.50 K and pressures up to 2.51 MPa. The same extrapolation method was used and determined to be to 330 K and 750 MPa for compositions greater than 30 % neon and less than 3 % neon.
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Details
- Title
- A Generalized Helmholtz Energy Functional Form for Thermodynamic Properties of Binary Mixtures Containing Hydrogen, Neon, and Helium
- Creators
- Thomas Max Blackham
- Contributors
- Jacob W. Leachman (Chair)Robert F Richards (Committee Member) - Washington State University, Mechanical and Materials Engineering, School ofSoumik Banerjee (Committee Member) - Washington State University, Mechanical and Materials Engineering, School of
- Awarding Institution
- Washington State University
- Academic Unit
- Mechanical and Materials Engineering, School of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525036501842
- Language
- English
- Resource Type
- Thesis