Mamoru Ozawa is a professor emeritus and a senior researcher of Research Center for Societal Safety Sciences, Kansai University, Japan. He received his doctoral degree from Osaka University in 1977. His research interests include boiling heat transfer, two-phase flow dynamics, combustion system, boiler, and safety in industrial systems. He has authored and coauthored more than 150 refereed journals, more than 150 conference papers, several handbooks, and many books related to thermal hydraulics in steam power. Among his edited books the most recently published Science of Societal Safety has been chapter-downloaded more than 60,000 times. He served the Board of Directors and the President of Heat Transfer Society of Japan and the Chairman of the Power and Energy Systems Division of the Japan Society of Mechanical Engineers (JSME). He was awarded several times from the Visualization Society of Japan, the Heat Transfer Society of Japan, and the JSME. Hitoshi Asano is a professor of the Department of Mechanical Engineering, Kobe University, Japan. He received his doctoral degree from the Kobe University in 2000. His research interests include boiling and condensation heat transfer, two-phase flow dynamics in energy conversion systems, compact heat exchangers for HVAC systems, and two-phase flow cooling systems for electric and power equipment. He has authored and coauthored more than 100 refereed journals and more than 130 conference papers. He is a member of the Scientific Council of International Center for Heat and Mass Transfer and is a fellow of the JSME. He received the Asian Academic Award from the Japan Society of Refrigeration and Air-Conditioning Engineers, the Society of Air-Conditioning and Refrigerating Engineers of Korea, and the Chinese Association of Refrigeration in 2018.