Koizumi, Yasuo is a research promotor and an invited researcher at the University of Electro-Communications at present. He had been an invited researcher of the Japan Atomic Energy Agency for five years before now. He received his PhD degree from the University of Tokyo in 1977. He started his research career at the Japan Atomic Energy Research Institute in 1977 as a research engineer for nuclear reactor safety. He stayed at the Idaho National Engineering Laboratory from 1981 through 1983. He moved to the Department of Mechanical Engineering of Kogakuin University in 1989. Then, he moved to the Department of Functional Machinery and Mechanics of Shinshu University in 2008. He retired as professor in 2014 and he had been in the Japan Atomic Energy Agency since then. His research is focused in the areas of pool and flow boiling, critical heat flux, condensation heat transfer, and two-phase flow. He is also interested in heat transfer and fluid flow on the microscale. Since his research field is closely related to energy systems, he has great interest in thermal and nuclear power stations and energy supply in society. Tomio Okawa started his research career at the Central Research Institute of the Electric Power Industry in 1990 and earned a doctor of engineering degree from the Tokyo Institute of Technology in 1995 after receiving bachelor’s and master’s degrees from Tokyo Institute of Technology. Then, he moved to the Department of Mechanical Engineering at Osaka University in 1999, and to his present position (The University of Electro-Communications, Tokyo, Japan) in 2011. His main research areas are gas-liquid two-phase flow and heat transfer with phase change. At present, he is doing research on subcooled flow boiling, departure from nucleate boiling, boiling heat transfer of nanofluid, application of nanoparticle layer to cooling of electronic devices, splashing during drop and liquid jet impingements on a liquid film, and thermal hydraulics encountered in freeze plug used in molten salt reactors. Shoji Mori is a Professor of Mechanical Engineering at Kyushu University, Japan. He received his PhD degree in Engineering from Kyushu University in 2003. He joined the Department of Chemical Engineering at Yokohama National University as an assistant professor in 2004, and he became an associate professor in 2007. He has been a faculty member at Kyushu University since 2019. From 2009 to 2011, he worked on cryo-preservation and thermal therapies at Bioheat and Mass Transfer Laboratory, Department of Mechanical Engineering, University of Minnesota, Minneapolis, as a visiting professor. His research interests are currently focusing on the enhancement of boiling critical heat flux and quenching using porous materials and two phase annular flow.