Nucleation Studies in Flowing High-Pressure Steam

1975 ◽  
Vol 189 (1) ◽  
pp. 427-436 ◽  
Author(s):  
F. Bakhtar ◽  
D. J. Ryley ◽  
K. A. Tubman ◽  
J. B. Young
Keyword(s):  
High Pressure ◽  
Equation Of State ◽  
Pressure Range ◽  
Virial Coefficient ◽  
Second Virial Coefficient ◽  
Expansion Rate ◽  
Theoretical Treatment ◽  
High Pressure Steam ◽  
Pressure Steam

A description is given of a theoretical treatment of nucleation in flowing steam employing an equation of state based on the second virial coefficient. Comparison is made with experimental observations of reversion in the pressure range 2–35 bars of steam in a convergent-divergent nozzle of expansion rate P = 104 s-1. The agreement obtained is moderate.

THE SECOND VIRIAL COEFFICIENT OF CARBON DIOXIDE AT LOW TEMPERATURES

1957 ◽  
Vol 35 (3) ◽  
pp. 268-275 ◽  
Author(s):  
D. Cook
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
High Temperature ◽  
Low Temperatures ◽  
Pressure Range ◽  
Virial Coefficient ◽  
Second Virial Coefficient ◽  
Expansion Method ◽  
Pressure Measurements ◽  
Gas Compressibility

The fixed volum e expansion method for gas compressibility measurements previously employed under conditions of high temperature and high pressure has now been developed for low temperature and low pressure measurements. A sensitive diaphragm null-pressure detector, operating as a capacitor, has been incorporated into the gas pipettes, and eliminates troublesome dead space corrections. The advantages and limitations of the method are discussed. Measurements of the second virial coefficient of carbon dioxide in the temperature range −60 °C. to + 30 °C, and in the pressure range 0.5 to 2.5 atmospheres, are reported.

Using CFD to Enhance the Preliminary Design of High-Pressure Steam Turbines

2013 ◽  
Author(s):  
Juri Bellucci ◽  
Federica Sazzini ◽  
Filippo Rubechini ◽  
Andrea Arnone ◽  
Lorenzo Arcangeli ◽  
...  
Keyword(s):  
High Pressure ◽  
Steam Turbine ◽  
Design Tool ◽  
Tip Clearance ◽  
Large Set ◽  
Preliminary Design ◽  
Steam Turbines ◽  
High Pressure Steam ◽  
Wide Range ◽  
Pressure Steam

This paper focuses on the use of the CFD for improving a steam turbine preliminary design tool. Three-dimensional RANS analyses were carried out in order to independently investigate the effects of profile, secondary flow and tip clearance losses, on the efficiency of two high-pressure steam turbine stages. The parametric study included geometrical features such as stagger angle, aspect ratio and radius ratio, and was conducted for a wide range of flow coefficients to cover the whole operating envelope. The results are reported in terms of stage performance curves, enthalpy loss coefficients and span-wise distribution of the blade-to-blade exit angles. A detailed discussion of these results is provided in order to highlight the different aerodynamic behavior of the two geometries. Once the analysis was concluded, the tuning of a preliminary steam turbine design tool was carried out, based on a correlative approach. Due to the lack of a large set of experimental data, the information obtained from the post-processing of the CFD computations were applied to update the current correlations, in order to improve the accuracy of the efficiency evaluation for both stages. Finally, the predictions of the tuned preliminary design tool were compared with the results of the CFD computations, in terms of stage efficiency, in a broad range of flow coefficients and in different real machine layouts.

Crosslinking Cotton Cellulose with a High Pressure Steam Process

2001 ◽  
Vol 71 (12) ◽  
pp. 1063-1067 ◽  
Author(s):  
Jui-Chin Chen ◽  
Wei-Hua Yao ◽  
Chien-Hsin Chen ◽  
Cheng-Chi Chen
Keyword(s):  
High Pressure ◽  
Cotton Cellulose ◽  
High Pressure Steam ◽  
Pressure Steam
Sign in / Sign up

Export Citation Format

Share Document