Abstract. In this study, acoustic analysis and thermofluid performance of a Ranque-Hilsch Vortex Tube (RHVT) is\nexperimentally investigated under different orifice diameters at its cold tube. The orifice diameters used are 2mm,\n3 mm, 4 mm, 5 mm and 6 mm. The inlet pressure (gage) is set at 10 psi, 15 psi, 20 psi and 25 psi for each orifice\ndiameter. The sound produced by the tube is recorded using a microphone located outside the cold tube. The acoustic\nsignal is processed using Fast-Fourier Transform (FFT) to obtain the frequency representation. Main frequencies are\nthen extracted to constitute the signature of the signal for that specific configuration. It is observed that different\norifice diameters give different signatures. These signatures are then associated with the thermofluid performance of\nthe device to obtain the relation among the parameters.
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