Study on the promotion of HCFC-141b hydrate formation by carbide nanofluids
In order to solve the problems of long induction time and high randomness in the formation of refrigerant HCFC-141b(monofluorodi chloroethane)hydrate,the synergistic promotion effect of nanofluid systems composed of titanium carbide nanoparticles and surfactant hexadecyl trimethyl ammonium bromide(CTAB)onhydrate formation was experimentally studied.Standard deviation of induction time and hydrate cold storage capacity were calculated based on experimental data.The results show that CTAB has preferable dispersibility and stability,and the promotion effect of nanofluids in the composite system is fur-ther enhanced.However,with the increase of TiC particle size and additive concentration,the promotion degree shows a charac-teristic of firstly increasing and then weakening.Optimal size of TiC nanoparticle is 40 nm,and the average induction time is shortened by 22.7％and 34.8％compared to 50 nm and 30 nm,respectively;optimal additive concentration is 120 ppm,the induction time is shortened to 53.2 min,the standard deviation is reduced to 8.4,and the maximum cold storage capacity can reach as high as 269.9 kJ/kg.The high surface energy and adsorption effect of carbide nanoparticles provide a large number of nucleation sites for the formation of refrigerant hydrates,while the Brownian motion and high thermal conductivity can promote both heat and mass transfer.
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