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- Title
Parameter Sensitivity of the Microdroplet Vacuum Freezing Process.
- Authors
Zhang, Zhijun; Zhang, Yuekai; Zhao, Lili; Zhang, Wenhui; Zhao, Shuangshuang
- Abstract
The vacuum freezing process of microdroplets (<100 μm in diameter) is studied by dynamic mesh method. The mass transfer coefficient was studied using the results of related papers that considered droplet diameters exceeding 1 mm. The diameter, initial temperature, and vacuum chamber pressure effects are also discussed. To estimate parameter sensitivity, the effects of material density, specific heat, and thermal conductivity in 20% scope, as well as latent evaporation/sublimation in 5%, were simulated. The results show that the mass transfer coefficient K is essentially different between microdroplets (<100 μm) and macrodroplet (>1 mm). Pressure and droplet diameter have an effect on cooling and freezing stages, but initial temperature only affects the cooling stage. The thermal conductivity coefficient kl affected the cooling stage, whereas ki affected the freezing stage. Heat capacity Cl affected the cooling stage, but Ci has virtually no effect on all stages. The actual latent heat of freezing ΔH was also affected. Higher density corresponds to lower cooling rate in the cooling stage.
- Subjects
SENSITIVITY analysis; MICRODROPLETS; FREEZING process (Water purification); MASS transfer coefficients; VACUUM chambers; THERMAL conductivity
- Publication
Mathematical Problems in Engineering, 2015, Vol 2015, p1
- ISSN
1024-123X
- Publication type
Article
- DOI
10.1155/2015/370159