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274 Cătălin Dumitraș et al. 3. Two FEA studies were carried out, one at 2D level, in order to identify the air flow critical areas. The 2D analysis does not ensure complete data regarding the in depth air flow so a further 3D finite element analysis was required. This analysis indicated the flow phenomenon dimensions at shoulder level and allowed a comparison between air flow at shoulder level and the air flow when a fabric is added. 4. The study took into consideration two models of the shoulder: without and with fabric. The fabric selected was the sandwich fabric with rectangular channels with an uniform distribution. 5. The study shown that the use of this fabric brought an improvement in air flow when used at shoulder level. The study requires additional work taking into account the followings: fabrics with other 3D effects (differently shaped channels – circular) and non-uniform distribution of these channels (patterned distribution of the 3D effect). One important target is to determine the shape of the channel path. These studies will lead to the optimization of garments used for protection against cold. Received: March 20, 2010 1 Technical University “Gheorghe Asachi”, Department of Machine Tools Iasi, Romania, e-mail: dumitrascatae@yahoo.com 2 Selcuk University, Department of Mechanics Konya, Turkeyt e-mail: syaldiz@yahoo.com R E F E R E N C E S 1. d e A r a u j o M., F a n g u e i r o R., H o n g H. – Texteis technicos, volume I, Braga, Portugal, 2000 2. H o l m e r I. – Textiles for Protection Against Cold, in Textiles for Protection, edited by R.A. Scott, Woodhead Publishing Ltd, Cambridge, UK, 2005, p. 378 – 397 3. L o g h i n C., C i o b a n u L., D u m i t r a s C. – Study regarding the conventional functions analyze and intelligent functions synthesis for the protective equipments for aggressive environments‘ research report, CEEX 105/2006 4. L o g h i n C., C i o b a n u L., D u m i t r a s C. – ‘Fundamentals of physical and chemical processes at the interface level between aggressive environment and protective equipment‘ research report, CEEX 105/2006 5. Z i e n k i e w i c i O. C. – The Finite Element Method for Fluid Dynamics, Elsevier, Amsterdam Netherland, 2006
Bul. Inst. Polit. Iaşi, t. LVI (LX), f. 2, 2010 275 MODELAREA 3D A SUPRAFETELOR TEXTILE CU DESTINAŢIA OPTIMIZĂRII CURGERII FLUIDELOR (Rezumat) Eficienţa protecţiei termice într-un mediu cu curenţi puternici de aer (vânt) poate fi îmbunătăţită printr-un echipament de protecţie adecvat. Ca urmare a unei analize cu elemente finite a curgerii fluidelor (aerului) pe suprafaţa corpului detectarea yonelor critice turbionare poate fi realizată. Aceste zone au fost detectate în locurile în care se modifică geometria corpului cum ar fi umeri, brate, etc. Concluziile acestei analize au condus la ideea că se poate obţine o îmbunătăţire a coeficientului de frecare a aerului prin modificarea geometriei echipamentului textil. Se pune problema determinării unei geometrii convenabile a acestui echipament astfel încât săse micşoreye sau să dispară zonele de curgere turbionară. Se propun mai multe variante de structuri textile cu geometrie 3D. Se realizează apoi un studiu destinat determinării profilului optim al structurii textile.
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