The effect of changing internal tube diameter on the performance of uniflow vortex tube

العمراني, اسعد توما

doi:10.30684/etj.26.12.14

	The effect of changing internal tube diameter on the performance of uniflow vortex tube
Engineering and Technology Journal
Article 1, Volume 26, Issue 12, 2008, Pages 524-534 PDF (411.52 K)
DOI: 10.30684/etj.26.12.14
Author
اسعد توما العمراني
Abstract
In this present work, the optimum design and performance of the uniflow vortex tube used as a cooling and heating device of high efficiency is investigated experimentally. Great attempts to reach minimizing the uniflow vortex tube size with high separation energy are investigated. The experimental investigation was carried out on a vortex tube rig especially designed for the present study covering all tests. Experiments were carried out on the vortex tube by fixing (L/D) at (20) for five tubes ,four of them are straight with diameters (30,20,15and 10) and the last is diverge tube with angle(θ=1.72°) and length(350mm),the cone angle is (θ= 30°),consequently the study of the energy separation performance of five uniflow vortex tubes wer carried out. The experimental results shows that the pronounced influence of the uniflow vortex tube (D=20mm, L=400mm) on the energy separation performance at cone valve diameter (dc=12mm), i.e the highest temperature of the hot air stream and the lowest temperature. The cold air stream reaches (47.5Co) at (Y=0.812) & (2.4Co) at (Y=0.313) respectively at the inlet air temperature (Ti=33Co). The results of the uniflow vortex tube shows that increasing the isentropic efficiency & coefficient of performance with increasing inlet air pressure within the range (Piabs = 2-6 bar) which reaches ηise= 24% at Y=0.753 & COP=0.14 at the same Y. Also the result shows that refrigeration capacity & efficiency of the energy separation increasing with increase inlet air pressure & reaches Qr=1385 watt at Y=0.704 & ηe =34% at Y=0.323.

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