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    Experimental investigation of performance of hot cascade type Ranque-Hilsch vortex tube and exergy analysis
    (ELSEVIER SCI LTD, 2011) Dincer, K.; Yilmaz, Y.; Berber, A.; Baskaya, S.
    In this study, three Ranque-Hilsch vortex tubes were used, which have 9 mm inside diameter and length/diameter ratio was 15. Their performances were examined as one of the classical RHVT and other was hot cascade type RHVT. Performance analysis was according to temperature difference between the hot outlet and the inlet (Delta T-hot.). The Delta T-hot values of hot cascade type Ranque-Hilsch vortex tubes were greater than the Delta T-hot values of classical RHVT, which were determined experimentally. The total inlet exergy, total outlet exergy, total lost exergy and exergy efficiency of hot stream were investigated by using experimental data. In both the classical RI-PIT and hot cascade type RHVT, it was found that as fraction of cold flow increases the total lost exergy decreases. It was also found that, the hot cascade type RHVT more exergy efficiency of hot outlet than the classical RHVT. Excess Delta T-hot value of hot cascade type Ranque-Hilsch vortex tube causes the excess exergy efficiency of hot outlet. (C) 2011 Elsevier Ltd and IIR. All rights reserved.
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    MODELING OF EXERGY EFFICIENCY PERFORMANCES OF COUNTER FLOW RANQUE-HILSCH VORTEX TUBES WITH DIFFERENT GEOMETRIC CONSTRUCTIONS USING ARTIFICIAL NEURAL NETWORKS
    (STEF92 TECHNOLOGY LTD, 2012) Berber, A.; Yilmaz, Y.; Dincer, K.; Ozen, D. N.; Baskaya, S.
    In this experimental study, the exergy efficiency performances of counter flow type Ranque-Hilsch vortex tubes (RHVT), with a length to diameter ratio of 10-18, were investigated for RHVT made of aluminum, brass, and steel having the internal diameter (D) of 9 mm. Cross section of nozzle was 0.002x0.002 m(2) and the number of nozzles (Nn) was 3. Flow was controlled with a valve on the hot outlet side, and the valve at the hot outlet side was changed from a nearly closed position from its nearly open position. The exergy efficiency of RHVT for various L/D ratios (10-18) and various ksi values (0.1-0.9) were determined under 440 kPa pressurized air. As a new approach, this study proposes determining the exergy efficiency by using artificial neural networks (ANN). As ANN input parameters, L/D, ksi, total outlet exergy and total lost exergy were used, while the exergy efficiency was the output parameter. The actual values and ANN results show that ANN can be successfully used for the exergy efficiency performances of counterflow Ranque-Hilsch vortex tube.