scholarly journals Experiments on the Capillary Condensation/Evaporation Hysteresis of Pure Fluids and Binary Mixtures in Cylindrical Nanopores

2021 ◽  
Vol 125 (10) ◽  
pp. 5802-5815
Author(s):  
Xingdong Qiu ◽  
Huan Yang ◽  
Morteza Dejam ◽  
Sugata P. Tan ◽  
Hertanto Adidharma
Keyword(s):  
Binary Mixtures ◽  
Capillary Condensation ◽  
Pure Fluids

High-Resolution Measurements at Nucleate Boiling of Pure FC-84 and FC-3284 and Its Binary Mixtures

2009 ◽  
Vol 131 (12) ◽  
Author(s):  
Enno Wagner ◽  
Peter Stephan
Keyword(s):  
Binary Mixtures ◽  
High Speed ◽  
Contact Region ◽  
Infrared Camera ◽  
Nucleate Boiling ◽  
Heated Wall ◽  
Rear Side ◽  
Phase Contact ◽  
Pure Fluids ◽  
Three Phase

In a special boiling cell, vapor bubbles are generated at single nucleation sites on top of a 20μm thick stainless steel heating foil. An infrared camera captures the rear side of the heating foil for analyzing the temperature distribution. The bubble shape is recorded through side windows with a high-speed camera. Global measurements were conducted, with the pure fluids FC-84 and FC-3284 and with its binary mixtures of 0.25, 0.5, and 0.75mole fraction. The heat transfer coefficient (HTC) in a binary mixture is less than the HTC in either of the single component fluid alone. Applying the correlation of Schlünder showed good agreement with the measurements (1982, “Über den Wärmeübergang bei der Blasenverdampfung von Gemischen,” Verfahrenstechnik, 16(9), pp. 692–698). Furthermore, local measurements were arranged with high lateral and temporal resolution for single bubble events. The wall heat flux was computed and analyzed, especially at the three-phase-contact line between liquid, vapor, and heated wall. The bubble volume and the vapor production rate were also investigated. For pure fluids, up to 50–60% of the latent heat flows through the three-phase-contact region. For mixtures, this ratio is clearly reduced and is about 35%.

Gradient theory modeling of surface tension for pure fluids and binary mixtures

2007 ◽  
Vol 254 (1-2) ◽  
pp. 75-90 ◽  
Author(s):  
Hong Lin ◽  
Yuan-Yuan Duan ◽  
Qi Min
Keyword(s):  
Surface Tension ◽  
Binary Mixtures ◽  
Gradient Theory ◽  
Pure Fluids

scholarly journals Capillary condensation and adsorption of binary mixtures

2006 ◽  
Vol 124 (23) ◽  
pp. 234712 ◽  
Author(s):  
B. Weinberger ◽  
F. Darkrim-Lamari ◽  
D. Levesque
Keyword(s):  
Binary Mixtures ◽  
Capillary Condensation

Boiling Heat Transfer With Binary Mixtures: Part II—Flow Boiling in Plain Tubes

1998 ◽  
Vol 120 (2) ◽  
pp. 388-394 ◽  
Author(s):  
S. G. Kandlikar
Keyword(s):  
Heat Transfer ◽  
Binary Mixtures ◽  
Boiling Heat Transfer ◽  
Flow Boiling ◽  
Nucleate Boiling ◽  
Mean Deviation ◽  
Data Set ◽  
Pure Fluids ◽  
Starting Point ◽  
Data Points

Flow boiling heat transfer with pure fluids comprises convective and nucleate boiling components. In flow boiling of binary mixtures, in addition to the suppression effects present in pool boiling, the presence of flow further modifies the nucleate boiling characteristics. In the present work, the flow boiling correlation by Kandlikar (1990, 1991b) for pure fluids is used as the starting point, and the mixture effects derived in Part I (Kandlikar, 1998) of this paper are incorporated. Three regions are defined on the basis of a volatility parameter, V1 = (cp/ΔhLG)(k/D12)1/2|(y1 − x1)dT/dx1|. They are: region I—near azeotropic, region II—moderate diffusion-induced suppression, and region III—severe diffusion-induced suppression. The resulting correlation is able to correlate over 2500 data points within 8.3 to 13.3 percent mean deviation for each data set. Furthermore, the α–x trend is represented well for R-12/R-22, R-22/R-114, R-22/R-152a, R-500, and R-132a/R-123 systems. Electrically heated stainless steel test sections as well as fluid-heated copper test sections are both covered under this correlation.

Imaging critical fluctuations of pure fluids and binary mixtures

2014 ◽  
Vol 90 (2) ◽  
Author(s):  
John J. Hegseth ◽  
Ana Oprisan ◽  
Yves Garrabos ◽  
Daniel Beysens
Keyword(s):  
Binary Mixtures ◽  
Critical Fluctuations ◽  
Pure Fluids

scholarly journals Unphysical Critical Curves of Binary Mixtures Predicted with GERG Models

2020 ◽  
Vol 41 (12) ◽  
Author(s):  
Ulrich K. Deiters ◽  
Ian H. Bell
Keyword(s):  
Critical Temperature ◽  
Equation Of State ◽  
Binary Mixtures ◽  
Critical Points ◽  
Thermodynamic Data ◽  
Equations Of State ◽  
Pure Fluids ◽  
Critical Curves ◽  
Pure Fluid ◽  
Vapor Liquid Equilibria

Abstract When applied to asymmetric binary mixtures (e.g., methane + pentane or heavier alkanes, hydrogen-containing mixtures), the GERG equation of state (GERG-2004 or GERG-2008) predicts critical curves with physically unreasonable temperature maxima above the critical temperature of the heavier component. These maxima are associated with physically impossible vapor–liquid equilibria. The phenomenon is probably caused by corrections for critical anomalies that were built into the empirical pure-fluid equations of state forming the foundation of the GERG model. These corrections ensure that the model represents thermodynamic data of pure fluids quite well even close to their critical points. For mixtures, however, the corrections can cause artifacts.

Capillary Condensation and Desorption of Binary Mixtures of N2−Ar Confined in a Mesoporous Medium

Langmuir ◽  
2000 ◽  
Vol 16 (20) ◽  
pp. 7551-7553 ◽  
Author(s):  
M. A. Alam ◽  
A. P. Clarke ◽  
J. A. Duffy
Keyword(s):  
Binary Mixtures ◽  
Capillary Condensation
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