1. Department of Mechanical Engineering, National University of Singapore, 10 Kent Ridge Crescent, Singapore 119260, Singapore
2. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, 6-1 Kasuga Koen, Kasuga Shi, Fukuoka 816-8580, Japan
3. Frigrite Limited, 27 Grange Road, Cheltenham, Victoria 3192, Australia