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Description
  • Z pohledu tzv. Klasické teorie nukleace jsou zkoumány nukleační procesy ve vodní páře. Je ukázáno, že s uvažováním možnosti vzniku pevných nukleačních jader lze dosáhnout shody mezi experimentálními měřeními nukleačních rychlostí a předpovědmi nukleační teorie při teplotách pod 240 K. Výsledné rozdíly jsou menší než jeden řád v nukleační rychlosti. Jedinou překážkou této hypotézy je neznámá povrchová energie ledu, kterou je třeba odvodit teoreticky. Je předpovězena křivka v termodynamické rovině teploty a přesycení, která odděluje oblast nukleace kapalných zárodků a nukleace pevných zárodků. Na této přechodové křivce předpovídá naše hypotéza změnu průběhu závislosti nukleační rychlosti na teplotě. (cs)
  • Nucleation processes in pure water are investigated from the point of view of the Classical Nucleation Theory (CNT). It is shown that it may be possible to remove the significant discrepancies between the nucleation rates predicted by the CNT and the experimentally measured nucleation rates below 240 K by theoretically allowing the nuclei to form as solid clusters. The only drawback is that an estimation of the unknown surface energy of the vapor-ice interface needs to be performed. Then the CNT nucleation rates differ in less than one order of magnitude from the available experimental data in the temperature range 200 – 260 K. A line can be found in the saturation-temperature plane that separates the region of gas-to-liquid from the gas-to-solid nucleation. A change of slope in the nucleation rate vs. temperature dependence is observed at the transition line.
  • Nucleation processes in pure water are investigated from the point of view of the Classical Nucleation Theory (CNT). It is shown that it may be possible to remove the significant discrepancies between the nucleation rates predicted by the CNT and the experimentally measured nucleation rates below 240 K by theoretically allowing the nuclei to form as solid clusters. The only drawback is that an estimation of the unknown surface energy of the vapor-ice interface needs to be performed. Then the CNT nucleation rates differ in less than one order of magnitude from the available experimental data in the temperature range 200 – 260 K. A line can be found in the saturation-temperature plane that separates the region of gas-to-liquid from the gas-to-solid nucleation. A change of slope in the nucleation rate vs. temperature dependence is observed at the transition line. (en)
Title
  • The possibility of direct gas-to-solid nucleation mechanism in water vapor
  • The possibility of direct gas-to-solid nucleation mechanism in water vapor (en)
  • Možnost přímého průběhu nukleace z plynné fáze do pevné fáze při (cs)
skos:prefLabel
  • The possibility of direct gas-to-solid nucleation mechanism in water vapor
  • The possibility of direct gas-to-solid nucleation mechanism in water vapor (en)
  • Možnost přímého průběhu nukleace z plynné fáze do pevné fáze při (cs)
skos:notation
  • RIV/61388998:_____/08:00312043!RIV09-AV0-61388998
http://linked.open...avai/riv/aktivita
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  • P(KJB400760701), Z(AV0Z20760514)
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  • 387881
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  • RIV/61388998:_____/08:00312043
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  • nucleation; pure water; gas-to-solid (en)
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http://linked.open...ontrolniKodProRIV
  • [787490AFD3CF]
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  • Berlín
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  • Berlín
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  • Water, Steam, and Aqueous Solutions Advances in Science and Technology for Power Genetation
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  • Němec, Tomáš
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number of pages
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  • VDI - The Association of German Engineers,GET - Society for Energy Technology
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  • 978-3-931384-64-7
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