ABSTRACT

Ranque-Hilsch Vortex Tube (RHVT) is a mechanic system which can make heating and cooling by using basic heat transfer laws with a compressed fluid. Environmental friendly RHVT is widely used in cooling systems in medicine, electronics, and computer sectors, particularly in the food sector. In this study, the performances of parallel RHVTs in which oxygen (O₂) gas is used were reviewed considering different inlet pressures, nozzle materials and orifice numbers. Test results were modeled by multiple linear regression method and regression equation was derived. Besides, Signal/Noise (S/N) ratios of the designed test results were calculated using Taguchi L16 mix type (4 × 2 2 × 1) orthogonal sequence, and optimum conditions were determined. Throughout the test, hot fluid outlet valve of the counter flow RHVTs having Ø10 mm inner diameter and 100 mm body length was completely left open. As control factors and levels, four different inlet pressures (200, 350, 500, and 650 kPa), four different number of orifices (three, four, five, and six), and two different nozzle materials (brass and polyamide) were selected. For quality characteristics, maximum temperature gradient (∆T) was determined. In order to determine the effect rates of the control factors on quality characteristics (∆T), variance analysis (ANOVA) was applied to test results at 95% confidence level. According to statistical results, it was determined that the response rates of ΔT values from the control factors were determined as inlet pressure, the number of orifices and nozzle material, respectively. Validity of the optimization was checked with confirmation tests, and the optimization proved to be used in evaluation of RHVT performances.

摘要

Ranque-Hilsch涡流管（RHVT）是一个机械系统，可以通过使用基本的传热定律和压缩流体来进行加热和冷却。环保的RHVT被广泛用于医药，电子和计算机领域的冷却系统，特别是在食品领域。在这项研究中，氧气（O ₂）考虑到不同的进口压力，喷嘴材料和节流孔数对使用的气体进行了审查。通过多元线性回归方法对测试结果进行建模，并推导回归方程。此外，使用田口L16混合类型（4×2 2×1）正交序列计算设计测试结果的信噪比（S / N），并确定最佳条件。在整个测试过程中，内径为Ø10mm，阀体长度为100 mm的逆流RHVT的热流体出口阀完全打开。作为控制因素和水平，选择了四个不同的入口压力（200、350、500和650 kPa），四个不同数量的孔（三个，四个，五个和六个）以及两种不同的喷嘴材料（黄铜和聚酰胺） 。对于质量特性，确定了最大温度梯度（∆T）。为了确定控制因素对质量特征（ΔT）的影响率，在95％的置信水平下对检验结果进行了方差分析（ANOVA）。根据统计结果，确定来自控制因素的ΔT值的响应率分别确定为入口压力，孔口数量和喷嘴材料。通过确认测试检查了优化的有效性，并证明该优化可用于评估RHVT性能。孔的数量和喷嘴材料的数量。通过确认测试检查了优化的有效性，并证明该优化可用于评估RHVT性能。孔的数量和喷嘴材料的数量。通过确认测试检查了优化的有效性，并证明该优化可用于评估RHVT性能。