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- W1563445549 abstract "The vacuum freezing process of microdroplets (<100 μ m 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<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mrow><mml:mi>K</mml:mi></mml:mrow></mml:math>is essentially different between microdroplets (<100 μ m) 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<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M2><mml:mrow><mml:msub><mml:mrow><mml:mi>k</mml:mi></mml:mrow><mml:mrow><mml:mi>l</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>affected the cooling stage, whereas<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M3><mml:mrow><mml:msub><mml:mrow><mml:mi>k</mml:mi></mml:mrow><mml:mrow><mml:mi>i</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>affected the freezing stage. Heat capacity<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M4><mml:mrow><mml:msub><mml:mrow><mml:mi>C</mml:mi></mml:mrow><mml:mrow><mml:mi>l</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>affected the cooling stage, but<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M5><mml:mrow><mml:msub><mml:mrow><mml:mi>C</mml:mi></mml:mrow><mml:mrow><mml:mi>i</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>has virtually no effect on all stages. The actual latent heat of freezing<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M6><mml:mo>Δ</mml:mo><mml:mi>H</mml:mi></mml:math>was also affected. Higher density corresponds to lower cooling rate in the cooling stage." @default.
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- W1563445549 date "2015-01-01" @default.
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- W1563445549 title "Parameter Sensitivity of the Microdroplet Vacuum Freezing Process" @default.
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- W1563445549 doi "https://doi.org/10.1155/2015/370159" @default.
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