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Piper M.,University of Paderborn | Olenberg A.,University of Paderborn | Tran J.M.,University of Paderborn | Goedecke R.,TU Braunschweig | And 3 more authors.
Chemie-Ingenieur-Technik | Year: 2014

Pillow-plate heat exchangers are a promising alternative to conventional heat exchangers. Their design methods are based on characteristic geometric parameters, for which no established determination procedures are available in the literature. In this work, the complex pillow-plate geometry is reproduced by accurate deformation simulations. In the following step, approximate equations describing the geometry are derived and validated. Based on this validation, suggestions for the preliminary evaluation of the characteristic geometrical parameters are made. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Piper M.,University of Paderborn | Tran J.M.,University of Paderborn | Kenig E.Y.,University of Paderborn | Kenig E.Y.,Gubkin University For Erdol Und Gas
Chemie-Ingenieur-Technik | Year: 2015

Pillow-plate heat exchangers (PPHE) represent a promising alternative to conventional shell-and-tube and plate heat exchangers, especially in condensation and evaporation. However, no reliable design methods for PPHE can be found in the open literature. Here, the fully developed turbulent flow in the wavy channel between two adjacent pillow plates is investigated by means of computational fluid dynamics (CFD). Furthermore, it is shown how the correlation for the turbulent flow in smooth pipes can be used for the design of the pillow-plate channel. A way to improve the thermohydraulic performance is suggested. © 2015 WILEY-VCH Verlag GmbH & Co. Source


Tran J.M.,University of Paderborn | Piper M.,University of Paderborn | Kenig E.Y.,University of Paderborn | Kenig E.Y.,Gubkin University For Erdol Und Gas
Chemie-Ingenieur-Technik | Year: 2015

Pillow-plate heat exchangers represent a new and promising heat exchanger type. Heat transfer and pressure drop on the inner side of pillow plates are key aspects that need to be considered in the design process. In contrast to other configurations, which have already been described in detail in the literature, the properties of pillow plates are largely unknown. Therefore, an experimental study of internal-side heat transfer and pressure drop was carried in this work. The results will improve the understanding of the thermohydraulic characteristics of pillow plates. © 2015 WILEY-VCH Verlag GmbH & Co. Source


Yildirim O.,University of Paderborn | Flechsig S.,University of Paderborn | Brinkmann U.,University of Paderborn | Kenig E.Y.,University of Paderborn | Kenig E.Y.,Gubkin University For Erdol Und Gas
Chemie-Ingenieur-Technik | Year: 2015

Für die fluiddynamische Auslegung von konventionellen Strukturpackungen und Anstaupackungen, bei denen zwei fluide Phasen im Gegenstrom geführt werden, ist die hinreichend genaue Vorhersage der Lastgrenzen essentiell. Ausgehend vom sogenannten Wallis-Plot kann ein empirischer Ansatz zur Beschreibung von Flutgrenzen generiert werden. In dieser Arbeit wird basierend auf experimentellen Daten zu den Flutgrenzen von konventionellen Struktur- und Anstaupackungen eine auf dem Wallis-Plot beruhende Korrelation erweitert. Diese ermöglicht eine Berechnung der Lastgrenzen in Abhängigkeit verschiedener Parameter. Die ermittelte Korrelation wird in ein bestehendes Fluiddynamikmodell zur Berechnung der Druckverluste von Anstaupackungen integriert. The sufficiently accurate prediction of loading limits is essential for the design of conventional structured packings and sandwich packings, in which a countercurrent flow of two phases takes place. Based on the so-called Wallis plot, an empirical approach to the determination of the flooding point can be suggested. In this work, the Wallis equation is extended using experimentally estimated loading limits of structured packings as well as sandwich packings. The influence of different parameters on loading limits is considered in the proposed correlation. The Wallis equation is implemented into a fluid dynamic model for the description of the pressure drop of sandwich packings. Es wird ein empirischer Ansatz zur Beschreibung der Flutgrenzen von konventionellen Strukturpackungen und Anstaupackungen angewandt. Daraus ergibt sich eine Korrelation, die in einem bestehenden Fluiddynamikmodell zur Berechnung der Druckverluste von Anstaupackungen verwendet wird. Copyright © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source


Yazgi M.,University of Paderborn | Tran J.M.,University of Paderborn | Ausner I.,Sulzer AG | Wehrli M.,Sulzer AG | And 2 more authors.
Chemie-Ingenieur-Technik | Year: 2015

Abstract An approach for the simulation of separation processes in packed columns is based on hydrodynamic analogy between complex flow pattern in real equipment units and geometrically simplified model flow and is known as the Hydrodynamic Analogy (HA) approach. In this work, the HA approach was applied to reactive absorption of CO2 in aqueous sodium hydroxide solution under turbulent gas flow conditions. An extensive experimental study was carried out to measure the CO2 concentration profiles along the column height. These data provided a basis for a successful validation of the HA approach. Copyright © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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