Evaluation of performance of parallel connected vortex tubes using air, oxygen and carbondioxide with Taguchi method
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ORIGINAL
Evaluation of performance of parallel connected vortex tubes using air, oxygen and carbondioxide with Taguchi method Hüseyin Kaya 1 Received: 14 January 2020 / Accepted: 15 September 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract This study involves an optimization procedure for the factors affecting the performance of the parallel connected vortex tube system using the Taguchi method. The effect of vortex tube inlet pressure, working fluid, nozzle material and nozzle number parameters on vortex tube performance were obtained as a percentage using experimental design and analysis. Experimental studies were carried out at inlet pressures (150, 300 and 450 kPa) with brass and polyamide nozzles having 3, 4 and 5 nozzle numbers using air, oxygen and carbon dioxide as working fluids. These parameters were selected as control parameters and Taguchi L18 orthogonal array was used to design of experiments. According to the optimization study performed with Taguchi method for the ΔT value, which is the performance indicator of the vortex tube, the most important control factor was found to be working pressure (79.50%). The order of importance of other control factors on ΔT was determined as working fluid, number of nozzles and nozzle material, respectively following of inlet pressure. Furthermore, the validity of the optimization was verified with the confirmation experiment. Keywords Ranque-Hilsch vortex tube . Heating and cooling . Optimization . Taguchi method
1 Introduction The counter-flow vortex tube, which is a system in which simultaneous heating and cooling effect can be achieved, is composed of a simple system that contains cylindrical pipe, nozzle, and hot outlet valve. These effects can only be obtained by applying the compressed fluid to the tube inlet. The hot outlet valve, which is a movable component in the hot fluid outlet, is another factor that affects vortex tube performance. The gap between this valve and hot exit affects the heating and cooling performance. Since the heating and cooling effects are achieved by using environmentally friendly fluids, there is no harmful gas emission. As a result of the nozzle shape providing tangential flow, a vortex flow occurs in the tube. The vortex flow formed at the nozzle outlet moves towards the hot outlet side of the tube. The hot fluid expands to the pipe walls, and the cold fluid remaining in the tube center starts to move back from a * Hüseyin Kaya [email protected] 1
Faculty of Engineering, Architecture and Design, Mechanical Engineering, Bartın University, 74100 Bartın, Turkey
stagnation point. This phenomenon is called flow separation, which simultaneously produces a hot and cold effect [1–3]. Vortex tube continues to attract the attention of researchers in terms of achieving heating and cooling effects, improving, and optimizing properties affecting the performance. A study explaining the working principle of vortex tube in detail and containing experimental results was made by Xue et al. and the effect of the geo
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