Satish G. Kandlikar is a Distinguished Institute Professor and the Gleason Professor of Mechanical Engineering at Rochester Institute of Technology, where he is working since 1980. He received his Ph.D. degree from the IIT Bombay in 1975. He has worked extensively in the area of flow boiling, pool boiling, CHF phenomena at microscale, single-phase flow in microchannels, electronics cooling, water management in PEM fuel cells and breast cancer detection. He has published over 400 journal and conference papers. He is the recipient of the 2012 ASME Heat Transfer Memorial Award. His recent work on pool and flow boiling has provided a mechanistic understanding of the boiling phenomena at microscale and nanoscale produced enhancement structures dissipating exceptionally high heat fluxes along with very high heat transfer coefficients. He started the ASME International Conference on Nanochannels, Microchannels and Minichannels and has been its chair for ten years. He is also recipient of numerous awards, including 2008 Engineer of the Year Award, 1996 Eisenhart Outstanding Teaching Award and RIT Trustee’s Scholarship Award among others.

Invention is a key enabler of progress. It starts with the understanding of how things work, and it leads to finding new pathways for changing the paradigm. Innovation takes it a step further, makes it useful, and demonstrates practical feasibility of a new process or a device. As a case study, the underlying mechanisms in a high heat flux cooler that utilizes efficient boiling/condensation mechanisms have been identified and new techniques and mechanisms were invented, and through research and innovation, major strides have been made in improving its performance. The “traditional” boiling process illustrated by a tea kettle boiler has undergone major changes based on the new understanding of various heat transfer mechanisms that have been recently identified surrounding a bubble. Inventing and then innovating are the major steps in the journey of an idea from inception to implementation in real world devices. This journey is fascinating, and the researchers derive great joy in facilitating as well as undertaking this journey. Be a part of this experience!

Professor Yasuyuki TAKATA is a Specially-Appointed Professor and Professor Emeritus at International Institute for Carbon-Neutral Energy Research (I2CNER), Kyushu University. His research interests include two-phase flow and heat transfer and thermophysical properties of hydrogen at ultra-high pressure. He was the Presidents of Heat Transfer Society of Japan (HTSJ) from 2019 to 2020 and the Asian Union of Thermal Science and Engineering (AUTSE) from October 2020 to September 2022. He received numerous awards including the JSME Thermal Engineering Achievement Award, HTSJ Award for Scientific Contribution. He is a Council Member of the Science Council of Japan since October 2020.

It is of great importance for water spray cooling of hot steel to predict “quenching point” where rapid cooling occurs by the direct contact between liquid and hot surface. Despite a number of previous studies, the mechanism of onset of quenching has not yet been clearly understood. One of the reasons is due to the oxide layers formed on the hot surface. These oxide layers have non-uniform porous structure and low thermal conductivity and hence increase the quenching temperature. In the present study, we try to explain the quenching temperature based on the assumption of the transient heat conduction for a contact between two semi-finite bodies. We used several different artificial oxide layers and made a series of experiments on spray cooling and observation of single individual droplet impinging onto the hot oxide surfaces. As a result, the onset of quenching always seems to happen at the contact surface temperature of around 250°C regardless of the composition and thickness of the oxide layer.

Dr. Qiuwang Wang, Professor of School of Energy & Power Engineering, Xi’an Jiaotong University, China. His research interests include heat transfer enhancement and energy saving, energy storage fundamental and technology, heat transfer under extreme conditions, heat transfer in porous media, prediction and optimization of thermal and fluid problems. He is a Fellow of ASME, a China Delegate of Assembly for Intl Heat Transfer Conference (AIHTC), an executive member of Scientific Council of Intl Centre for Heat & Mass Transfer (ICHMT), a Vice President of Chinese Society of Engineering Thermophysics in Heat & Mass Transfer. He is the founding Editor-in-Chief of Energy Storage and Saving, the Associate Editor of International Journal of Heat and Mass Transfer, Heat Transfer Engineering, and Editorial Board Members for several international journals such as Renewable and Sustainable Energy Reviews, Energy Conversion and Management, Energy, Applied Thermal Engineering, etc. He is the founding chair of two international conferences: International Workshop on Heat Transfer Advances for Energy Conservation and Pollution Control (IWHT, since 2011) and the International Conference on Energy Storage and Saving (ICENSS, since 2022). He has also delivered more than 40 Plenary/Keynote lectures in international conferences.

ABSTRACT

More than 4.5 billion tons of high-temperature granules are produced annually in high-temperature process industries as metallurgy, chemical engineering and building materials. Over 300 million tons of standard coal are consumed and the unused waste heat exceeds 100 million tons in those fields. Traditional cooling techniques like water quenching result in a significant discharge of waste gas/water. Therefore, improving the energy efficiency and material utilization during industrial process, achieving the reduction of solid waste, are of great importance for the efficient energy conservation of process industries. In traditional calcination process, the external overburning and internal underburning of a single granule result in high energy consumption and low product quality. The high-temperature granules with wide size range also presents considerable obstacles to the recovery of waste heat with traditional fixed bed, moving bed and fluidized bed. Addressing the above-mentioned problems, this study proposed a principle of spatio-temporal thermal resistance control for gravity driven solid granules thermal process equipment. The calcination technology with multi-dimensional alternating heating was proposed to realize the temporal thermal resistance control of granules. Also, high-efficiency waste heat recovery technologies were proposed to address the issue of high apparent thermal resistance. Based on the above technology, an integrated equipment including uniform calcination, granules grading and efficient heat recovery was developed.