Theory of diffusion and sorption of various substances through a biporous sorbent membrane for the case of a constant concentration difference at its boundaries and a linear sorption isotherm. I. Case of an exponential kinetic function for the microporous zones

1980 ◽  
Vol 29 (8) ◽  
pp. 1200-1204
Author(s):  
V. I. Ulin ◽  
P. P. Zolotarev ◽  
A. I. Pilipenko
Keyword(s):  
Sorption Isotherm ◽  
Constant Concentration ◽  
Concentration Difference ◽  
Kinetic Function ◽  
Linear Sorption ◽  
Biporous Sorbent

Heat and Moisture Transfer in Energy Wheels During Sorption, Condensation, and Frosting Conditions

1998 ◽  
Vol 120 (3) ◽  
pp. 699-708 ◽  
Author(s):  
C. J. Simonson ◽  
R. W. Besant
Keyword(s):  
Sorption Isotherm ◽  
Energy Recovery ◽  
Moisture Transfer ◽  
Operating Conditions ◽  
Type I ◽  
Heat And Moisture Transfer ◽  
Linear Sorption ◽  
Coupled Heat And Moisture ◽  
Energy Wheels ◽  
Heat And Moisture

A numerical model for coupled heat and moisture transfer with sorption, condensation, and frosting in rotary energy exchangers is presented and validated with experimental data. The model is used to study condensation and frosting in energy wheels. Condensation/frosting increases with humidity and at some humidity level, water/frost will continually accumulate in the wheel. The sensitivity of condensation and frosting to wheel speed and desiccant type are studied. The energy wheel performance is also presented during both sorption and saturation conditions for a desicant coating with a Type I sorption isotherm (e.g., molecular sieve) and a linear sorption isotherm (e.g., silica gel). Simulation results show that the desiccant with a linear sorption curve is favorable for energy recovery because it has better performance characteristics and smaller amounts of condensation/frosting for extreme operating conditions.

The Onset of Thermohaline Convection in a Linearly-Stratified Horizontal Layer

1976 ◽  
Vol 98 (4) ◽  
pp. 558-563 ◽  
Author(s):  
J. H. Wright ◽  
R. I. Loehrke
Keyword(s):  
Porous Metal ◽  
Horizontal Layer ◽  
Free Boundaries ◽  
Constant Concentration ◽  
Concentration Difference ◽  
Thermohaline Convection ◽  
Metal Plates ◽  
Convective Motions ◽  
Fixed Constant ◽  
Rayleigh Numbers

The convective stability of a horizontal layer of water with salt and heat addition from below was studied experimentally. The layer was bounded above and below by porous metal plates through which heat and salt could diffuse. A well-mixed region of warm, salty water below the lower plate and another of cooler, fresher water above the upper plate set the temperature and concentration difference for the intervening quiescent layer. With a fixed, constant concentration gradient established between the plates the temperature difference was slowly increased until convective motions were observed. The instability boundary for this system lies within the unstable region predicted by linear theory for a horizontal layer with constant gradients and stress-free boundaries and approaches the linear boundary at high Rayleigh numbers.

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