Rates of Water Vapor Adsorption from Air by Silica Gel

Extraordinary water adsorption characteristics of graphene oxide

“…The overall adsorption rate of GO was calculated using the linear driving force model (LDF), 27 where the rate of water adsorption is defined as Here q[combining macron] and q are the transient and equilibrium water adsorption in the sorbent, respectively, and k is the mass transfer coefficient. The average k value for silica gel was found to be 2.54 h –1 , which in good agreement with the literature 28 and similar to the k value measured on molecular sieves (3 Å). 29 GO was found to have a k value of 13.36 h –1 , which is around five times higher than that of silica gel, and is higher than that of MIL-101 without any modification by hydroscopic salts.…”

Moisture Transport in Silica Gel Particle Beds: I. Theoretical Study

“…to(16) will be used in the analysis of silica gel bed performance presented later.This ratio depends on the internal structure of the particle (average pore radius, surface area, tortuosity factors), isotherm slope and temperature.The results of calculations for this ratio show[11] that the dominant mechanism in RD gel is surface diffusion, while both surface and Knudsen diffusion should be considered for ID gel. This conclusion is consistent with the conclusion arrived at in Appendix A for a single pore.…”

Dehumidification Analysis of Rotary Solid Desiccant Wheel System for different Surface Materials

“…Thus, the mass transfer analysis of silica gel shows that the surface diffusion coefficient is the most dominant moisture transport mechanism for the rotary desiccant wheel system. The smaller the diffusion coefficient, greater the effectiveness of rotary desiccant wheel system [8]. Figures 5 and 6 shows the Knudsen diffusion coefficient variation for Silica gel, Molecular sieve and Activated alumina with air inlet temperatures at process and regeneration sectors.…”