Su Yun, Liu Bin, Wang Ruixing, et al. Phase Change Characteritics of Al2O3-H2O Nano-fluids Measured By DSC[J]. Journal of refrigeration, 2014, 35(1). DOI: 10.3969/j.issn.0253-4339.2014.01.033.
the thermal properties of nano-fluids are important for its further application. The effect of diameter
mass fraction and cooling rate to solidification point
freezing point
melting temperature
specific heat capacity and latent heat of Al2O3 was measured by Differential Scanning Calorimetry (DSC). The diameter of nanoparticle is 10nm
20nm
50nm
100nm
500nm. The mass fraction is 5%
10%
12%
15%
20%.The cooling rate is 2℃/min
3℃/min
5℃/min
7℃/min
9℃/min. The results show that the nanoparticle plays a critical role on cool storage. The solidification point and freezing point of nanofluids are higher than the deionized water. With the increase of nanoparticle sizes
mass fraction and cooling rate
the solidification point and freezing point of nanofluids will increase
and the specific heat capacity of nanofluids will decrease. The melting temperature will increase with the increase of nanoparticle sizes
mass fraction
and also decrease with the increase of cooling rate. The latent heat of deionized water is higher than the nanofluids’. The latent heat of nanofluids will increase with the increase of diameter of nanoparticle and decrease with the increase of mass fraction and cooling rate.