Mesurage du taux d'adsorption/désorption isotherme de vapeur d'eau utilisant la méthode QCM et de sa résistance au transfert de masse d'une couche revêtue de microparticules de gel de silice dans un air humide

Translated title of the contribution: 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

Yoshinori Hamamoto, Takehiro Nakamori, Hideo Mori

Research output: Contribution to journalArticle

Abstract

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.

Original languageFrench
Pages (from-to)11-18
Number of pages8
JournalInternational Journal of Refrigeration
Volume105
DOIs
Publication statusPublished - Sep 1 2019

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Quartz crystal microbalances
Silica gel
Water vapor
Desorption
Boundary layers
Mass transfer
Adsorption
Air
Adsorbents
Quartz
Atmospheric humidity
Gold
Flow rate
Crystals
Electrodes

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Mechanical Engineering

Cite this

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title = "Mesurage du taux d'adsorption/d{\'e}sorption isotherme de vapeur d'eau utilisant la m{\'e}thode QCM et de sa r{\'e}sistance au transfert de masse d'une couche rev{\^e}tue de microparticules de gel de silice dans un air humide",
abstract = "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.",
author = "Yoshinori Hamamoto and Takehiro Nakamori and Hideo Mori",
year = "2019",
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language = "フランス語",
volume = "105",
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journal = "International Journal of Refrigeration",
issn = "0140-7007",
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T1 - Mesurage du taux d'adsorption/désorption isotherme de vapeur d'eau utilisant la méthode QCM et de sa résistance au transfert de masse d'une couche revêtue de microparticules de gel de silice dans un air humide

AU - Hamamoto, Yoshinori

AU - Nakamori, Takehiro

AU - Mori, Hideo

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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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