scholarly journals Application of Three-Layer Model Analysis on Single-Component Two-Phase Critical Flow through Converging Nozzle. Comparison of the Experimental Results of Steam-Water and Carbon Dioxide with Calculations.

1994 ◽  
Vol 60 (574) ◽  
pp. 1923-1927
Author(s):  
Junji Ochi ◽  
Kyozo Ayukawa ◽  
Genta Kawahara
Keyword(s):  
Carbon Dioxide ◽  
Model Analysis ◽  
Single Component ◽  
Experimental Results ◽  
Critical Flow ◽  
Layer Model ◽  
Two Phase ◽  
Flow Through

The Two-Phase Critical Flow of One-Component Mixtures in Nozzles, Orifices, and Short Tubes

1971 ◽  
Vol 93 (2) ◽  
pp. 179-187 ◽  
Author(s):  
Robert E. Henry ◽  
Hans K. Fauske
Keyword(s):  
Critical Pressure ◽  
Single Phase ◽  
Pressure Ratio ◽  
Stagnation Pressure ◽  
Experimental Results ◽  
Critical Flow ◽  
Two Phase ◽  
Transfer Rates ◽  
Critical Flow Rate ◽  
Flow Through

The critical flow of one-component, two-phase mixtures through convergent nozzles is investigated and discussed including considerations of the interphase heat, mass, and momentum transfer rates. Based on the experimental results of previous investigators, credible assumptions are made to approximate these interphase processes which lead to a transcendental expression for the critical pressure ratio as a function of the stagnation pressure and quality. A solution to this expression also yields a prediction for the critical flow rate. Based on the experimental results of single-phase compressible flow through orifices and short tubes, the two-phase model is extended to include such geometries. The models are compared with steam-water, cryogenic, and alkali-metal experimental data.

Visualization of Supercritical Carbon Dioxide Flow Through a Converging-Diverging Nozzle

2019 ◽  
Author(s):  
Chang Hyeon Lim ◽  
Gokul Pathikonda ◽  
Sandeep Pidaparti ◽  
Devesh Ranjan
Keyword(s):  
Carbon Dioxide ◽  
Supercritical Carbon Dioxide ◽  
Critical Point ◽  
High Speed ◽  
Operating Conditions ◽  
Higher Plant ◽  
Two Phase ◽  
Pressure Profiles ◽  
Flow Through ◽  
Supercritical Carbon

Abstract Supercritical carbon dioxide (sCO2) power cycles have the potential to offer a higher plant efficiency than the traditional Rankine superheated/supercritical steam cycle or Helium Brayton cycles. The most attractive characteristic of sCO2 is that the fluid density is high near the critical point, allowing compressors to consume less power than conventional gas Brayton cycles and maintain a smaller turbomachinery size. Despite these advantages, there still exist unsolved challenges in design and operation of sCO2 compressors near the critical point. Drastic changes in fluid properties near the critical point and the high compressibility of the fluid pose several challenges. Operating a sCO2 compressor near the critical point has potential to produce two phase flow, which can be detrimental to turbomachinery performance. To mimic the expanding regions of compressor blades, flow through a converging-diverging nozzle is investigated. Pressure profiles along the nozzle are recorded and presented for operating conditions near the critical point. Using high speed shadowgraph images, onset and growth of condensation is captured along the nozzle. Pressure profiles were calculated using a one-dimensional homogeneous equilibrium model and compared with experimental data.

scholarly journals Application of a fast transonic trajectory determination approach in 1-D modelling of steady-state two-phase carbon dioxide flow

2019 ◽  
Vol 128 ◽  
pp. 06005
Author(s):  
Wojciech Angielczyk ◽  
Kamil Śmierciew ◽  
Dariusz Butrymowicz
Keyword(s):  
Carbon Dioxide ◽  
Equilibrium Model ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Simulations ◽  
Flow Modelling ◽  
Flow Through ◽  
Darcy Friction Factor ◽  
Trajectory Determination

An original generalised procedure of determination of the transonic trajectory has been proposed. The procedure is much faster than the commonly used Newton Critical Point approach. The approach was applied in modelling of a carbon dioxide transonic two-phase flow through the converging-diverging nozzle by means of the Homogeneous Equilibrium Model and Delayed Equilibrium Model (DEM). The simulations concern flows that were experimentally and theoretically investigated in the literature. DEM was prev ously used only in choked water flow simulations. Its application in CO2 flow modelling and the supersonic trajectory part determination is a novel contribution. The adjusted for CO2 version of the closurelaw was proposed. The investigation revealed that the applied Darcy friction factor determination approach has a significant influence on the results. Moreover, the models are unable of producing physically acceptable solutions until theLockhartMartinelli approach is utilised. It was shown that the Friedel approach might be considered more proper for CO2 flows.

Two-phase equilibrium in binary and ternary systems VIII. The integral flash latent heat at constant pressure of the system ethylene-carbon dioxide

1951 ◽  
Vol 209 (1097) ◽  
pp. 143-157 ◽  
Keyword(s):  
Carbon Dioxide ◽  
Phase Equilibrium ◽  
Binary Mixture ◽  
Latent Heat ◽  
Constant Pressure ◽  
Ternary Systems ◽  
Experimental Results ◽  
Two Phase ◽  
Margules Equation ◽  
Binary And Ternary Systems

A method of determining the integral flash latent heat of a binary mixture at constant pressure is described and results are given for the system ethylene-carbon dioxide. The experimental results are compared with those calculated from the Duhem-Margules equation.

scholarly journals Absorption of Carbon Dioxide in Upward Two-Phase Flow through a Vertical Tube.

1996 ◽  
Vol 10 (3) ◽  
pp. 282-285
Author(s):  
Kenichi KIKUCHI ◽  
Hiroshi TAKAHASHI ◽  
Tatsuo SAITO
Keyword(s):  
Carbon Dioxide ◽  
Two Phase Flow ◽  
Vertical Tube ◽  
Phase Flow ◽  
Two Phase ◽  
Flow Through
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