CHEN Shuping, YAO Shuting, XIE Fushou, et al. Thermal conductivity of frost layer on finned-tube vaporizer based on fractal theory[J]. CIESC Journal, 2012, (12): 3855-3860.
CHEN Shuping, YAO Shuting, XIE Fushou, et al. Thermal conductivity of frost layer on finned-tube vaporizer based on fractal theory[J]. CIESC Journal, 2012, (12): 3855-3860.DOI: 10.3969/j.issn.0438-1157.2012.12.017.
A numerical simulation for frost formation and growth on the surface of finned-tube vaporizer was carried out based on the diffusion limited aggregation model of fractal theory
and images of frost formation and growth at different stages were obtained by experimental observations.For the frost layer profile on the surface of vaporizer
fractal dimension of pore area distribution and fractal porosity were calculated.The simulation results are in good agreement with experiments.Then the fractal model for heat conduction through the frost layer was established and the thermal resistance method was used to get an expression for thermal conductivity of frost layer.The result shows that the calculated thermal conductivity of frost layer falls in the range of measured data.Compared with other thermal conductivity models
the introduction of profile area distribution fractal dimension into the thermal conductivity model is appropriate
which is a new method for the theoretical study for thermal conductivity of frost layer.