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64 Răzvan Florin Barzic et al. 3. Theoretical values of thermal conductivity are high recommending the investigated nanocomposites as good thermal conductor materials for power electronics. Acknowledgements. This paper was realized with the support of POSDRU CUANTUMDOC “Doctoral Studies for European Performances in Research and Innovation” ID79407 project funded by the European Social Fund and Romanian Government. REFERENCES Bicerano J., Prediction of the Properties of Polymers from their Structures. J.M.S. – Rev. Macromol. Chem. Phys., C36, 161-196 (1996). Choi T. Y., Poulikakos D., Measurement of Thermal Conductivity of Idividual Multiwalled Carbon Nanotubes by the 3-ω Method. Appl. Phys. Lett., 87 (2005). Han Z., Fina A., Thermal Conductivity of Carbon Nanotubes and their Polymer Nanocomposites: A Review. Prog. Polym. Sci., 36, 914-944 (2011). Ke G., Guan W. C., Tang C. Y., Hu Z., Guan W. J., Zeng D. L., Deng F., Covalent Modification of Multiwalled Carbon Nanotubes with a Low Molecular Weight Chitosan. Chin. Chem. Lett., 18, 361-364 (2007). Riggs J. E., Guo Z., Carroll D. L., Sun Y. P., Strong Luminescence of Solubilized Carbon Nanotubes. J. Am. Chem. Soc., 122, 5879-5880 (2000). PROPRIETĂŢI TERMICE ALE NANOCOMPOZITELOR POLISTIREN/NANOTUBURI DE CARBON OBŢINUTE PRIN METODA FORFECĂRII (Rezumat) Pentru a obţine o orientare mai bună a nanotuburilor de carbon inserate în matricea de polistiren (PS) s-a utilizat o metodă nouă, şi anume forfecarea compozitului încă din faza de soluţie. În acest scop, s-a utilizat un solvent cu rată de difuzie mare, şi anume clorura de metilen, pentru a menţine organizarea impusă prin forfecare. Astfel, soluţia se depune pe suportul unui dispozitiv, care prezintă o lamă care se deplasează cu viteză controlată inducând prin forfecare orientarea catenelor macromoleculare şi implicit a nanotuburilor de carbon. Pentru a investiga în ce masură această tehnică conduce la rezultatul dorit s-au făcut studii morfologice a filmelor astfel preparate. Morfologia filmelor astfel preparate a fost investigată prin microscopie de forţă atomică (AFM) arată că nanotuburile de carbon sunt orientate în matricea de PS, având lungimea perpendiculară pe suprafaţa filmului compozit. Organizarea nanotuburilor de carbon în PS este ideală pentru îmbunătăţirea conductivităţii termice, rezultând materiale polimere compozite cu rolul de protejare a componentelor circuitului electric de supraîncălzire. Acest aspect este susţinut şi de calculele teoretice privind conductivitatea termică care pentru un procent de 5% CNT în matricea de PS creşte până la 41.49 W/m K.
BULETINUL INSTITUTULUI POLITEHNIC DIN IAŞI Publicat de Universitatea Tehnică „Gheorghe Asachi“ din Iaşi, Tomul LVIII (LXII), Fasc. 4, 2012 Secţia CONSTRUCŢII DE MAŞINI MODELLING OF A PLATE CROSS FLOW HEAT EXCHANGER BY IONEL IVANCU, DANIEL DRAGOMIR STANCIU ∗ , IONUŢ CRÎŞMARU, DAN TEODOR BĂLĂNESCU and GEORGE OVIDIU RĂU “Gheorghe Asachi” Technical University of Iaşi, Department of Mechanical and Automotive Engineering Received: November 10, 2012 Accepted for publication: November 30, 2012 Abstract. The paper presents heat transfer modelling in a plate heat exchanger. Inside the heat exchanger, heat is transferred from the flue gas (of a hot water boiler) to air. The purpose of the paper is to analyse variation of the air parameters when air passes one channel of the heat exchanger. Key words: heat transfer, plate heat exchanger, modelling. 1. Introduction Heat exchangers are devices used for heat transfer between two or more fluids with different temperature levels. They are essential elements for many thermal systems. For example, they make possible the heat transfer from a primary to a secondary circuit in a solar thermal system. Due to their great advantages (intensive heat transfer, low price, high heat recovery efficiency, compactness, large heat transfer surface, reduced pressure loss, easy operation) plate heat exchangers are widely spread and studied (Durmus et al., 2009), (Ghosh et al., 2006), (Chittur et al., 1990). The purpose of the developed study is the analysis of the heat transfer from flue gas (delivered by a hot water boiler) to air in a plate heat exchanger. The first stage of the study was the CFD analysis of the heat exchanger while ∗ Corresponding author: e-mail: ddragomir03@yahoo.com
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