The Development of Swirling Decaying Laminar Flow in an Annular Pipe Baiman Chen, Frank G.F. Qin, Youyuan Shao, Hanmin Xiao, Simin Huang and Kelvin Ho E3S Web Conf., 51 (2018) 03001 Published online: 24 August 2018 DOI: 10.1051/e3sconf/20185103001