1. Department of Mechanical & Industrial Engineering, Faculty of Engineering, Gadjah Mada University, Jalan Grafika No. 2, Yogyakarta 55281, Indonesia
2. Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Fluid Dynamics, P.O. Box 510 119, 01314 Dresden, Germany
3. Institute of Nuclear Technology, Institute of Nuclear Safety System, Incorporated, 64 Sata, Mihama-cho, Mikata-gun, Fukui 919-1205, Japan