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10. Homogeneous nucleation in supersaturated vapors of methane, ethane, and carbon dioxide predicted by brute force molecular dynamics.

Author

Horsch, Martin, Vrabec, Jadran, Bernreuther, Martin, Grottel, Sebastian, Reina, Guido, Wix, Andrea, Schaber, Karlheinz, and Hasse, Hans

Subjects
MOLECULAR dynamics, NUCLEATION, METHANE, ETHANES, CARBON dioxide, SURFACE energy
Abstract

Molecular dynamics (MD) simulation is applied to the condensation process of supersaturated vapors of methane, ethane, and carbon dioxide. Simulations of systems with up to a 106 particles were conducted with a massively parallel MD program. This leads to reliable statistics and makes nucleation rates down to the order of 1030 m-3 s-1 accessible to the direct simulation approach. Simulation results are compared to the classical nucleation theory (CNT) as well as the modification of Laaksonen, Ford, and Kulmala (LFK) which introduces a size dependence of the specific surface energy. CNT describes the nucleation of ethane and carbon dioxide excellently over the entire studied temperature range, whereas LFK provides a better approach to methane at low temperatures. [ABSTRACT FROM AUTHOR]

Published
2008
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12. Enlargement of Submicron Gas‐Borne Particles by Heterogeneous Condensation for Energy‐Efficient Aerosol Separation.

Author

Hamberger, Philipp, Koch, Daniela Piccioni, Sinanis, Sokratis, and Schaber, Karlheinz

Subjects
PACKED towers (Chemical engineering), AEROSOLS, SUPERSATURATION, CONDENSATION, MANUFACTURING processes, HEAT, MICROBIOLOGICAL aerosols
Abstract

To improve the efficiency of aerosol separation, a process sequence for particle enlargement by condensation of water vapor on their surface is suggested. The presented method makes use of packed columns in non‐equilibrium operation to achieve supersaturation, which is required for droplet growth. Although this method is known for several years, it is not widely used in industrial processes and still needs accurate investigations for consolidation and establishment. The simulation tool AerCoDe3.0 for predicting saturation and particle growth in packed columns allows investigating the thermal energy consumption under various operation conditions. Based on the results obtained in this study, optimized arrangements of columns, which are applicable as preconditioning step for existing particle separators, are proposed. [ABSTRACT FROM AUTHOR]

Published
2019
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13. Performance analysis of an evaporation process of plate heat exchangers installed in a Kalina power plant.

Author

Mergner, Hanna and Schaber, Karlheinz

Subjects
*PLATE heat exchangers, *KALINA cycle, *GAS mixtures, *WORKING fluids, *ENERGY consumption, *TEMPERATURE measurements
Abstract

In geothermal power generation, ammonia-water (NH 3 H 2 O) mixtures are considered as working fluids in order to improve efficiency from low enthalpy heat sources. During the evaporation process, the NH 3 H 2 O working pair as zeotropic working fluid has the advantage to evaporate not isothermal temperature but over a temperature glide to adapt better to the heat source temperature profile. By today, there is a lack of performance data from operational generation units available in literature that can be used for scientific works based on computational calculations to compare with. In this paper the data logs from the evaporation process of the geothermal power plant are analyzed in order to review the evaporator's performance. Data had been gathered for a period of 5 years and three key performance parameters were defined: pressure drop, vapor fraction and heat transmission capacity. The main parameters that influence the performance are the temperatures, pressures and flow rates. It turned out, that the NH 3 mass fraction plays only a minor role within the evaporation process. [ABSTRACT FROM AUTHOR]

Published
2018
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15. Generation and Deposition of Organic Nanoparticles in a Liquid Ring Pump.

Author

Brunn, Claudia, Sinanis, Sokratis, Mall-Gleissle, Susanne, and Schaber, Karlheinz

Subjects
NANOPARTICLES, CHEMICAL vapor deposition, SEALING compounds, GAS-liquid interfaces, COMPRESSION loads
Abstract

A new method for the production of organic nanoparticles or nanosuspensions in a liquid ring vacuum pump is presented. A hot carrier gas charged under vacuum conditions with poorly water-soluble organic substances is compressed and simultaneously cooled by the partially evaporating sealant water of the liquid ring vacuum pump. During compression and quenching, the gas-vapor mixture becomes highly supersaturated and aerosol formation initiated by homogeneous nucleation occurs in the compression chambers between the impeller blades of the pump. The thus generated gas-borne droplets or solid particles are mainly trapped and enriched in the sealant ring liquid, which is discharged, separated from the carrier gas in an external separator and returned to the pump. Experiments yielded aqueous nanosuspensions of insoluble organic substances with typical particle sizes between 50 and 300 nm, as well as foam in the external gas-liquid separator. The foam showed stable structures due to incorporated solid nanoparticles. [ABSTRACT FROM AUTHOR]

Published
2015
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18. BackMatter.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Published
2013

33. FrontMatter.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Published
2013

35. Grundlagen und das chemische Gleichgewicht.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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36. Gleichgewichtsreaktionen in der Gasphase.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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37. Energieumsatz bei chemischen Reaktionen und Standardgröβen.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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38. Grenzflächenbestimmte Systeme und spontane Phasenübergänge.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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39. Empirische Ansätze für Zustandsgröβen von Gemischen.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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40. BackMatter.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Published
2010

41. Prozesse zur Stofftrennung.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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42. Verbrennungsprozesse.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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43. Stoff- und Energiebilanzen für die Prozessberechnung.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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44. Gleichgewichtsreaktionen in Elektrolytlösungen.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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45. Phasenzerfall und Phasengleichgewichte.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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46. Das chemische Potential realer Fluide.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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47. Thermodynamisches Gleichgewicht und Stabilität.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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48. Konstitutive Gröβen und Gleichungen zur Beschreibung von Mischphasen.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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49. Phasengleichgewichte: Phänomenologie und Phasendiagramme.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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50. Dampf-Gas-Gemische.

Author

Stephan, Peter, Schaber, Karlheinz, Stephan, Karl, and Mayinger, Franz

Abstract

Copyright of Thermodynamik (9783540367093) is the property of Springer Nature / Books and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2010
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