Computational Fluid Dynamics Simulation of Fouling of Plate Heat Exchanger by Phosphate Calcium

Autor: Ulla Ojaniemi, Antti Koponen, Timo Pättikangas, Ari Jäsberg, Eini Puhakka

Publikováno v: Ojaniemi, U, Pättikangas, T, Jäsberg, A, Puhakka, E & Koponen, A I 2022, ' Computational Fluid Dynamics Simulation of Fouling of Plate Heat Exchanger by Phosphate Calcium ', Heat Transfer Engineering, vol. 43, no. 15-16, pp. 1396-1405 . https://doi.org/10.1080/01457632.2021.1963551

A computational fluid dynamics (CFD) model was developed for fouling of calcium phosphate in heat exchangers which can consider the tendency of fluid components to precipitate and the surface properties of the materials. In the CFD model the precipit

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2ba0c65f77681879a4116b921c519961
https://cris.vtt.fi/en/publications/03e22777-e469-4eea-85cd-2a4b6bdaca07

Integrated transient simulation of a BFB boiler with CFD models for the BFB furnace and dynamic system models for the steam cycle and boiler operation

Autor: Hannu Niemistö, Ville Ylä-Outinen, Ville Hovi, Timo Pättikangas, Sirpa Kallio, Lassi Karvonen, Ismo Karppinen, Marko Huttunen, Sami Tuuri

Publikováno v: Hovi, V, Huttunen, M, Karppinen, I, Pättikangas, T, Niemistö, H, Karvonen, L, Kallio, S, Tuuri, S & Ylä-Outinen, V 2017, ' Integrated transient simulation of a BFB boiler with CFD models for the BFB furnace and dynamic system models for the steam cycle and boiler operation ', Energy Procedia, vol. 120, no. August, pp. 508-515 . https://doi.org/10.1016/j.egypro.2017.07.186

An approach for integrated transient simulation of a BFB boiler furnace and the coupled steam cycle is presented. The BFB furnace is simulated with in-house CFD models implemented in the ANSYS Fluent® software. The boiler steam cycle with control lo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f747e5c78348f8059f7bed1f9140aa8b
http://juuli.fi/Record/0284340817

Coupled one-dimensional and CFD models for the simulation of steam generators

Autor: Ville Hovi, Vesa Riikonen, Timo Pättikangas

Publikováno v: Hovi, V, Pättikangas, T & Riikonen, V 2016, ' Coupled one-dimensional and CFD models for the simulation of steam generators ', Nuclear Engineering and Design, vol. 310, pp. 93-111 . https://doi.org/10.1016/j.nucengdes.2016.09.023

A computational procedure suitable for modeling both vertical and horizontal steam generators is presented. The procedure consists of a one-dimensional model for the whole steam generator and a CFD model for the secondary side. The three-dimensional

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::de6fd96bbfe7aca793e79d1b909ec740
https://cris.vtt.fi/en/publications/a13f7c2c-f95c-4f6a-8341-64e45d2c36f9

Fluid-structure interaction analysis of large-break loss of coolant accident

Autor: Timo Pättikangas, Timo Toppila, Tellervo Brandt, Antti Timperi, Ismo Karppinen, Ville Lestinen, Jukka Kähkönen

Publikováno v: Brandt, T, Lestinen, V, Toppila, T, Kähkönen, J, Timperi, A, Pättikangas, T & Karppinen, I 2010, ' Fluid-structure interaction analysis of large-break loss of coolant accident ', Nuclear Engineering and Design, vol. 240, no. 9, pp. 2365-2374 . https://doi.org/10.1016/j.nucengdes.2009.11.013
Lestinen, V, kähkönen, J, Toppila, T, Brandt, T, Timperi, A, Pättikangas, T & Karppinen, I 2008, ' Fluid-structure interaction analysis of large-break loss of coolant accident ', Experiments and CFD Code Applications to Nuclear Reactor Safety, OECD/NEA Workshop, XCFD4NRS, Grenoble, France, 10/09/08-12/10/08 . < https://publications.vtt.fi/julkaisut/muut/2008/AC-02_Lestinen.pdf >

In this article, we study a Large-Break Loss of Coolant Accident (LBLOCA) where a guillotine break of one of the main coolant pipes occurs near the reactor pressure vessel (RPV). This initiates a rarefaction wave which propagates inside the RPV. The

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ff30381d3508af94314cb7008000be90
https://doi.org/10.1016/j.nucengdes.2009.11.013

Parasitic Particle Acceleration and Rf Power Absorption in Edge Plasmas

Autor: M. J. Mantsinen, Timo Pättikangas, Seppo Karttunen, Jukka Heikkinen, A. Lampela, Karin Rantamäki

Publikováno v: Heikkinen, J, Rantamäki, K, Karttunen, S, Lampela, A, Mantsinen, M & Pättikangas, T 2000, ' Parasitic particle acceleration and Rf power absorption in edge plasmas ', Contributions to Plasma Physics, vol. 40, no. 3-4, pp. 276-287 . https://doi.org/10.1002/1521-3986(200006)40:3/4<276::AID-CTPP276>3.0.CO;2-I

Understanding edge plasma phenomena in the presence of radio‐frequency heating is crucial to constructing launchers that can survive long‐pulse or steady‐state high‐power operation. In some experiments, significant fractions of lost power for

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4f06f24b2e16606cf39e0744319ca88b
https://doi.org/10.1002/1521-3986(200006)40:3/4<276::aid-ctpp276>3.0.co