The Effect of Tube Length, Cold Exit Diameter and Working Gas on The Cold Flow Temperature of Vortex TubeMuhammad Fadhli Suhaimi, Mohd Hazwan Yusof, Mohamad Nor Hafiz Rashid and Mohamad Firdaus BasrawiMATEC Web Conf., 225 (2018) 02010DOI: https://doi.org/10.1051/matecconf/201822502010