scholarly journals A COMPARISON OF THE EQUILIBRIUM AND THE DROPLETS BASED NON-EQUILIBRIUM COMPRESSIBLE PHASE CHANGE SOLVERS FOR CONDENSATION OF CARBON DIOXIDE INSIDE NOZZLES

2021 ◽  
Vol 16 ◽  
Author(s):  
Shyam Sunder Yadav ◽  
Kapil Dev Choudhary ◽  
Mani Sankar Dasgupta
Keyword(s):  
Carbon Dioxide ◽  
Phase Change ◽  
Non Equilibrium

Permeability enhancement and porosity change of coal by liquid carbon dioxide phase change fracturing

2021 ◽  
Vol 287 ◽  
pp. 106106
Author(s):  
Xianfeng Liu ◽  
Baisheng Nie ◽  
Kunyong Guo ◽  
Chengpeng Zhang ◽  
Zepeng Wang ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Phase Change ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide ◽  
Porosity Change ◽  
Permeability Enhancement

Implications of Phase Change on the Aerodynamics of Centrifugal Compressors for Supercritical Carbon Dioxide Applications

2020 ◽  
Author(s):  
Giacomo Persico ◽  
Lorenzo Toni ◽  
Paolo Gaetani ◽  
Ernani Fulvio Bellobuono ◽  
Alessandro Romei ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Power Systems ◽  
Phase Change ◽  
Critical Point ◽  
Fluid Dynamic ◽  
Flow Analysis ◽  
Design Strategy ◽  
Ideal Gas ◽  
New Challenges ◽  
Line Design

Abstract Closed Joule-Bryton cycles operating with carbon dioxide in supercritical conditions (sCO2) are nowadays collecting a significant scientific interest, due to their high potential efficiency, the compactness of their components, and the flexibility that makes them suitable to exploit diverse energy sources. However, the technical implementation of sCO2 power systems introduces new challenges related to the design and operation of the components. The compressor, in particular, operates in a thermodynamic condition close to the critical point, whereby the fluid exhibits significant non-ideal gas effects and is prone to phase change in the intake region of the machine. These new challenges require novel design concepts and strategies, as well as proper tools to achieve reliable predictions. In the present study, we consider an exemplary sCO2 power cycle with main compressor operating in proximity to the critical point, with an intake entropy level of the fluid lower than the critical value. In this condition, the phase change occurs as evaporation/flashing, thus resembling cavitation phenomena observed in liquid pumps, even though with specific issues associated to compressibility effects occurring in both the phases. The flow configuration is therefore highly nonconventional and demands the development of proper tools for fluid and flow modeling, which are instrumental for the compressor design. The paper discusses the modeling issues from the thermodynamic perspective and then highlighting the implications on the compressor aerodynamics. We propose tailored models to account for the effect of the phase change in 0D mean-line design tools as well as in fully 3D computational fluid-dynamic (CFD) simulations. In this way, a design strategy is build-up as a combination of mean-line tools, industrial design experience, and CFD for detailed flow analysis. The application of the design strategy reveals that the potential onset of the phase change might alter significantly the performance and operation of the compressor, both in design and in off-design conditions.

Kinetics of Carbon Dioxide Hydration Enhanced with a Phase-Change Slurry of n-Tetradecane

2017 ◽  
Vol 31 (4) ◽  
pp. 4245-4254 ◽  
Author(s):  
Bin Chen ◽  
Feng Xin ◽  
Xiaofei Song ◽  
Xingang Li ◽  
Muhammad Zeshan Azam
Keyword(s):  
Carbon Dioxide ◽  
Phase Change ◽  
Kinetics Of

Use of phase change materials on an adsorbed carbon dioxide storage system

2013 ◽  
Vol 51 (1-2) ◽  
pp. 512-519 ◽  
Author(s):  
Mario Toledo ◽  
Cristián Rojas ◽  
Esteban Montes ◽  
José Veloso ◽  
Alejandro Sáez
Keyword(s):  
Carbon Dioxide ◽  
Phase Change ◽  
Phase Change Materials ◽  
Storage System ◽  
Carbon Dioxide Storage ◽  
Adsorbed Carbon
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