The effect of changing internal tube diameter on the performance of uniflow vortex tube
Engineering and Technology Journal,
2008, Volume 26, Issue 12, Pages 524-534
AbstractIn 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.
- Article View: 122
- PDF Download: 28