TY - JOUR
T1 - Measuring of isothermal water vapor adsorption/desorption rate using QCM method and its mass transfer resistance of a layer coated with silica-gel micro particles in a moist air
AU - Hamamoto, Yoshinori
AU - Nakamori, Takehiro
AU - Mori, Hideo
N1 - Funding Information:
The authors wish to acknowledge the financial support by JSPS KAKENHI Grant Number JP 26420147 .
Publisher Copyright:
© 2019 Elsevier Ltd and IIR
PY - 2019/9
Y1 - 2019/9
N2 - A quartz crystal microbalance (QCM) technique was used to measure amounts of adsorbed and desorbed water vapor in a moist air to a thin layer of adsorbent consolidated with silica-gel micro particles on the quartz crystal coated with thin gold electrodes. First, measured relative isothermal equilibrium adsorption was confirmed to reproduce the catalogue data of the silica gel. Then, the adsorption and desorption rates to the layer were measured under a condition of a step change of the surrounding relative humidity. Overall mass transfer resistance which related to both the mass diffusion in the particle and the mass transfer in the boundary layer was revealed by the obtained time constants of these reactions. The resistance decreased with the increase of the velocity, and it became a negligible quantity in the boundary layer when the flow rate was above 0.1 m s−1. Finally, correlations were proposed to predict these resistances.
AB - A quartz crystal microbalance (QCM) technique was used to measure amounts of adsorbed and desorbed water vapor in a moist air to a thin layer of adsorbent consolidated with silica-gel micro particles on the quartz crystal coated with thin gold electrodes. First, measured relative isothermal equilibrium adsorption was confirmed to reproduce the catalogue data of the silica gel. Then, the adsorption and desorption rates to the layer were measured under a condition of a step change of the surrounding relative humidity. Overall mass transfer resistance which related to both the mass diffusion in the particle and the mass transfer in the boundary layer was revealed by the obtained time constants of these reactions. The resistance decreased with the increase of the velocity, and it became a negligible quantity in the boundary layer when the flow rate was above 0.1 m s−1. Finally, correlations were proposed to predict these resistances.
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U2 - 10.1016/j.ijrefrig.2019.03.003
DO - 10.1016/j.ijrefrig.2019.03.003
M3 - Article
AN - SCOPUS:85068512149
SN - 0140-7007
VL - 105
SP - 11
EP - 18
JO - International Journal of Refrigeration
JF - International Journal of Refrigeration
ER -