Die evaluering van die verkoelingsvermoe van werwelingsbuise wat gebruik maak van verskillende konfigurasies van spuitstukke

Abstract

The project deals with the improvement of the cooling capacity of a simple vortex tube to have a cooling device available with a good efficiency and cooling capacity. Three Ranque-Hilsch Vortex tubes, with different diameters and lengths, were developed and manufactured . The vortex tube is an unique device with no working parts and has the ability to deliver hot and cold air simultaneously. The vortex tube is a simple, low cost device, which is easy to manufacture. Different sizes of orifices were manufactured and different configurations of nozzles were designed and manufactured to investigate the performance of the three vortex tubes. The smaller diameter vortex tube gave better efficiencies and temperature drops in the cold air than the bigger diameter vortex tube with all the different nozzles and against the different inlet pressures. The bigger diameter orifice gave better efficiencies and temperature drops in the cold air than the smaller diameter. The smaller diameter nozzles gave better efficiencies and temperature drops in the cold air than the bigger diameter nozzles against the different inlet pressures. In general, the convergent nozzle gave better efficiencies and temperature drops in the cold air than the other nozzle shapes. The maximum efficiency of the 22 mm diameter vortex tube is improved from 8,9% against a cold fraction of 0,630 (with the <!> 6 mm x 2 tangential nozzle block) to J 8,92% against a cold fraction of 0,644 (with the <!> 3 mm x 4 tangential nozzle block) against an inlet pressure of 500 kPa. The maximum drop in temperature of the cold air is improved from 27,0°C against a cold fraction of 0, 120 (with the <!> 6 mm x 2 tangential nozzle block) to 42,3°C against a cold fraction of 0,284 (with the <!> 4 mm x 2 tangential nozzle block) against an inlet pressure of 600 kPa.