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    Assessment of Plug Angle Effect on Exergy Efficiency of Counterflow Ranque-Hilsch Vortex Tubes With the Exergy Analysis Method
    (Gazi Universitesi Muhendislik-Mimarlik, 2009) Dinçer, K.; Başkaya, S.
    In this study, the experimental data was gathered from Ranque-Hilsch vortex tube with 5 air nozzles, an inner-diameter of 9 mm and with 12 diameter to length ratio, with 30°, 60°, 90°, 120°,150° conic 5 mm diameter plug tip angles. The experimental system was modelled as a thermo-dynamic öpen system. ??inlet, ??outlet, İ, and the exergy efficiency of RHVT were calculated and the exergy band diagram of RHVT was also presented. It was also found out that the exergy efficiency was low for low levels of Pinlet and it was found to be high with higher levels of Pinlet- At the end of the calculations, it was determined that the exergy efficiency of the system, changed between 1,14 and 40,21 and it was determined that the exergy efficiency was high for ?=90°.
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    Experimental Investigation and Exergy Analysis of the Performance of a Counter Flow Ranque-Hilsch Vortex Tube With Regard to Nozzle Cross-Section Areas
    (ELSEVIER SCI LTD, 2010) Dinçer, K.; Avcı, A.; Başkaya, S.; Berber, A.
    Exergy analysis and performance of a Ranque-Hilsch Vortex Tube (RHVT) with various nozzle cross-section areas (NCSA = 3 x 3, 4 x 4, 5 x 5 mm(2)) were determined under inlet pressures (P-i) of 260, 300 kPa (absolute) pressurized air. The maximum difference in the temperatures of hot output and cold output streams was obtained for NCSA = 3 x 3 mm(2). The total inlet exergy (Sigma (E) over dot(i)), total outlet exergy (Sigma (E) over dot(o)), total lost exergy (Sigma (E) over dot(Lost)) and exergy efficiency (eta, %) were calculated. It was determined that the exergy efficiency of the system, varied between 1% and 39%, and the highest exergy efficiency was obtained for NCSA = 3 x 3 mm(2). The exergy efficiency strongly depends on the level of P-i, xi and nu(cold)-Variation of the exergy efficiency decreased with decreasing Pi, xi, nu(cold) and the highest and lowest exergy efficiencies were found when the values of P-i, xi, nu(cold) reached maximum and minimum levels, respectively.