Acknowledgments
Lie-Jin Guo is a professor in the School of Energy and Power Engineering, Xi’an Jiaotong University. He was granted the Ph.D. in thermal engineering from Xi’an Jiaotong University in 1989. He is now the Director of the State Key Laboratory of Multiphase Flow in Power Engineering. His main research interests include hydrogen production by biomass gasification in supercritical water and from solar energy, high pressure steam-water two-phase flow and boiling heat transfer, and multiphase flow in petroleum engineering.