Vortex tube is a simple device which can produce two streams of hot and cold temperature without any chemical reaction from a compressed gas stream. Recently, it is expected to be not only one of the possible alternative cooling methods to reduce environmental hazard but also various applications. Small size vortex tube is widely used in industrial application, just like a spot cooling devices, however, it is not enough to study length effect of the vortex tube yet. Therefore, experiments were carried out in various vortex length ratio(L/D=10-55) to find an appropriate geometry of vortex tube length at 5.6mm diameter, under optimum conditions, i.e. vortex nozzle area ratio(Sn=0.155) and cold end orifice diameter ratio(ζ=0.446). Working fluids was used air. The results shows that L=25D is design guide in the vortex tube.

Abstract
 기호설명
 1. 서 론
 2. 실험장치 및 실험방법
 3. 실험결과 및 고찰
 4. 결 론
 참 고 문 헌

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• 최병진(대구보건대학 안경디자인과) | B. J. CHOI