Abstract:

Based on the preparation of the uniform and stable Al₂O₃ nanofluid，two experimental schemes were developed，which validated that the ammonia bubble absorption effect was enhanced by adding Al₂O₃ nano-particles into the absorption solution.Two main factors which possibly induce the enhancing absorption effect were found：one was the stability of the nanofluid，the other was the pressure difference between the inlet of the absorber and the gas phase surface in the absorber.In the conditions of sodium dodecyl benzene sulfonate（SDBS）additive，the Al₂O₃ nanofluid having good stability and enhancing absorption effect could be obtained，although the experimental results showed that the absorption effect of ammonia was restrained by only adding SDBS additive into the absorption solution.Under the bigger pressure difference the Al₂O₃ nanofluid could represent the enhancing absorption effect at the beginning stage of absorption.With the concentration of ammonia solution increasing，the absorption potential declined，but the enhancing influence induced by the nanofluid was more obvious compared with that with no nanofluid.The possible mechanism of the experimental phenomena was explained.This paper provides a reference for subsequent research on the heat and mass transfer for nanofluid and the thermochemical compressor of the minitype ammonia absorption refrigerator.