“…Several experimental works can be mentioned, such as Yajnik and Subbaiah (1973), Weske and Struve (1974), Murakami et al (1976), Kitoh (1991), Li and Tomita (1994), Dirkzwager (1996), Yan et al (2000) and Jawarneh and Vatistas (2006). Also, analytical and numerical studies have been done by Talbot (1954), Weber (1956), Najafi et al (2003), Jawarneh and Vatistas (2006), Murphy et al (2007) and Benim et al (2007). We can refer the work by Talbot (1954) for laminar and Kitoh (1991) and Steenbergen and Voskamp (1998) for turbulent swirling flow, centered on swirl intensity decay rate in the axial direction for the problem solution.…”