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Effect of acoustic wave on the enhancement of moisture adsorption of silica-gel

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Abstract

In this study the enhancement effect of adsorption mass transfer by acoustic wave is investigated to understand how the acoustic wave influences the adsorption performance. The experimental data were obtained to show the behavior of silica-gel adsorption with/without acoustic field. The experimental results showed the adsorption speed with acoustic wave became higher than that without acoustic wave although the equilibrium adsorption amount was kept to be the same. From the viewpoint of acoustic wave conditions, the adsorption speed was increased with increasing the velocity amplitude, while the pressure amplitude had no effect on the enhancement. The maximum adsorption speed attained five times as high as the case without acoustic wave when the velocity amplitude was 1.35 m/s. Background air flow velocity is also an influential factor. The experimental results support that the non-dimensional ratio of the velocity amplitude to the background flow velocity is essential to describe the enhancement effect. Based on the observed data, an empirical formula was estimated to express the relationship between the enhancement effect and the non-dimensional velocity amplitude. The liner regression showed the good agreement and gave the critical non-dimensional velocity amplitude of 1.9 over which acoustic wave is effective to amplify the mass transfer rate of adsorption.

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Abbreviations

a :

Regression coefficient

f :

Frequency (Hz)

k m1 :

Mass transfer coefficient without acoustic wave (1/s)

k m2 :

Mass transfer coefficient with acoustic wave (1/s)

P :

Pressure amplitude (kPa)

q :

Adsorption amount (g/kg)

q*:

Equilibrium adsorption amount (g/kg)

R :

Enhancement effect (= km2/km1) (−)

RH :

Relative humidity (%)

T :

Temperature (°C)

t :

Time (s)

U :

Velocity amplitude (m/s)

U 0 :

Critical velocity amplitude (m/s)

U*:

Non-dimensional velocity amplitude (= U/V0) (−)

V :

Air velocity (m/s)

V 0 :

Background flow velocity (m/s)

ω:

Angular frequency (1/s)

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Authors and Affiliations

  1. Tokyo University of Agriculture and Techology, 2-24-16 Nakacho, Koganei-shi, Tokyo, 184-8588, Japan

    Atsushi Akisawa, Ken-ichi Okubo, Keijiro Iguchi, Yuki Ueda & Masayuki Nakayama

Authors
  1. Atsushi Akisawa
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  2. Ken-ichi Okubo
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  3. Keijiro Iguchi
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  4. Yuki Ueda
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  5. Masayuki Nakayama
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Correspondence to Atsushi Akisawa.

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Akisawa, A., Okubo, Ki., Iguchi, K. et al. Effect of acoustic wave on the enhancement of moisture adsorption of silica-gel. Adsorption 24, 595–600 (2018). https://doi.org/10.1007/s10450-018-9970-1

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  • DOI: https://doi.org/10.1007/s10450-018-9970-1

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