Avadhesh Kumar Sharma

@the university of tokyo, japan

Project Researcher, Nuclear Professional Group, The Univeristy of Tokyo, Japan
Project Researcher

Experienced Project Researcher specializing in the fields of thermal management and fluid mechanics. Expertise spans both practical experimentation and advanced computational analysis, focusing on effective problem solving. Highly adaptable, thrive in diverse work environments, excelling both as independent contributor and collaborative team member. Career highlights include over 40 international publications, showcasing a strong track record of punctuality and reputation for offering technical guidance and making informed decisions.

EDUCATION

• Ph.D. in Mechanical Engineering (Thermal & fluid flow) from Indian Institute of Technology Indore, INDIA, GPA 8.63 (Jan 2020).
• Master of Technology (MTech) in Energy from Indian Institute of Technology Jodhpur, INDIA, GPA 7.83 (Sep 2014).
• Bachelor of Technology (BTech) in Mechanical Engineering from Government Engineering College Bikaner, INDIA, 65.87% (Aug 2012).

RESEARCH, TEACHING, or OTHER INTERESTS

Mechanical Engineering, Safety, Risk, Reliability and Quality, Fluid Flow and Transfer Processes, Colloid and Surface Chemistry

Scopus Publications

228

Scholar Citations

Scholar h-index

Scholar i10-index

Scopus Publications

Effect of wettability and particle size on aerosol removal efficiency in charged and neutral water spray systems
Zeeshan Ahmed, Ravinder Kumar, Avadhesh Kumar Sharma, Ruicong Xu, Shuichiro Miwa, Koji Okamoto, and Shunichi Suzuki
Elsevier BV

Improvement of aerosol spray scavenging efficiency by pre-injecting electrically charged water mist
Ruicong Xu, Avadhesh Kumar Sharma, Shuichiro Miwa, and Shunichi Suzuki
Elsevier BV

Development of improved spray system with effective electrical electrodes for aerosol removal: An experimental study in UTARTS facility
Ruicong Xu, Avadhesh Kumar Sharma, Shuichiro Miwa, and Shunichi Suzuki
Elsevier BV

Study on the difference between B<inf>4</inf>C powder and B<inf>4</inf>C pellet regarding the eutectic reaction with stainless steel
Zhenhan Hong, Zeeshan Ahmed, Marco Pellegrini, Hidemasa Yamano, Nejdet Erkan, Avadhesh Kumar Sharma, and Koji Okamoto
Elsevier BV

Eutectic melting and relocation behavior of B<inf>4</inf>C pellet-stainless steel under radiative heating
Zeeshan Ahmed, Avadhesh Kumar Sharma, Marco Pellegrini, Hidemasa Yamano, Sho Kano, and Koji Okamoto
Elsevier BV

Experimental investigation on effective aerosol scavenging using different spray configurations with pre-injection of water mist for Fukushima Daiichi decommissioning
Rui-Cong Xu, Avadhesh Kumar Sharma, Erdal Ozdemir, Shuichiro Miwa, and Shunichi Suzuki
Springer Science and Business Media LLC
AbstractDuring the decommissioning of the Fukushima Daiichi nuclear power plant, it is important to consider the retrieval of resolidified debris both in air and underwater configurations. For the subsequent retrieval of debris from the reactor building, the resolidified debris must be cut into smaller pieces using various cutting methods. During the cutting process, aerosol particles are expected to be generated at the submicron scale. It has been noted that such aerosols sizing within the Greenfield gap (0.1–1 μm) are difficult to remove effectively using traditional spraying methods. Therefore, to improve the aerosol removal efficiency of the spray system, a new aerosol agglomeration method was recently proposed, which involves injecting water mist to enlarge the sizes of the aerosol particles before removing them using water sprays. In this study, a series of experiments were performed to clarify the proper spray configurations for effective aerosol scavenging and to improve the performance of the water mist. The experimental results showed that the spray flow rate and droplet characteristics are important factors for the aerosol-scavenging efficiency and performance of the water mist. The results obtained from this study will be helpful for the optimization of the spray system design for effective aerosol scavenging during the decommissioning of the Fukushima Daiichi plant.

Modeling passive/active transition in high-temperature dry oxidation of reaction-sintered SiC for innovative fuel matrix in high-temperature gas-cooled reactors
Yosuke Nishimura, Anna Gubarevich, Katsumi Yoshida, Avadhesh Kumar Sharma, and Koji Okamoto
Elsevier BV

Integrated experimental assessment and validation of oxidation with real-scale SiC fuel compact in HTGR
Avadhesh Kumar Sharma, Wataru Sagawa, Zeeshan Ahmed, Yosuke Nishimura, and Koji Okamoto
Elsevier BV

Visualization Experiments of Radiation Heating on the Eutectic Reaction Between B<inf>4</inf>C-SS and Its Relocation Behavior
Zeeshan Ahmed, Avadhesh Kumar Sharma, Marco Pellegrini, Hidemasa Yamano, and Koji Okamoto
Springer Nature Switzerland

Radiation Heating Effects on B<inf>4</inf>C-SS Eutectic Melting and Its Relocation Behaviour
Zeeshan Ahmed, Avadhesh Kumar Sharma, Marco Pellegrini, Hidemasa Yamano, and Koji Okamoto
Springer Science and Business Media LLC

Kinetic modeling of IG-110 oxidation in inert atmosphere with low oxygen concentration for innovative high-temperature gas-cooled reactor applications
Yosuke Nishimura, Anna Gubarevich, Katsumi Yoshida, Avadhesh Kumar Sharma, and Koji Okamoto
Informa UK Limited

Scavenging of laser-generated aerosols with electrostatic-charged spray droplets
Avadhesh Kumar Sharma, Ruicong Xu, Zeeshan Ahmed, Shuichiro Miwa, Benjamin Blaisot, Shunichi Suzuki, Hui Liang, and Nejdet Erkan
Elsevier BV

Numerical simulation of aerosol generation by cutting fuel debris and aerosol removal by spray droplets during Fukushima decommissioning
Hui Liang, Nejdet Erkan, Kai Wang, Avadhesh Kumar Sharma, and Shunichi Suzuki
Elsevier BV

Aerosol Generation by Continuous Fiber Laser Irradiation of Various Surfaces and Spray Scavenging
Avadhesh Sharma, Ruicong Xu, Zeeshan Ahmed, Erdal Ozdemir, and Shuichiro Miwa
American Nuclear Society

INVESTIGATION ON AEROSOL SPRAY SCAVENGING BY USING A MULTI-HOLE NOZZLE WITH WATER MIST FOR DECOMMISSIONING OF FUKUSHIMA DAIICHI POWER PLANTS

Radioactive Aerosol Control and Decontamination in the Decommissioning of the Fukushima Daiichi Nuclear Power Station
Avadhesh Kumar Sharma, Hui Liang, Ruicong Xu, Erdal Ozdemir, Shuichiro Miwa, Ryohei Terabayashi, Shunichi Suzuki, Marco Pellegrini, Shuichi Hasegawa, and Nejdet Erkan
Informa UK Limited
Abstract The recent Nuclear Regulation Authority evaluation report suggests that at the Fukushima Daiichi Nuclear Power Station, the concrete shield plugs above the primary containment vessel (PCV) have exceptionally high radiation levels in Units 2 and 3, which may increase the risk of radiation exposure during decommissioning operations. During the cleaning and disassembly of such radiation hot spots, it is expected that a large amount of submicron-sized radioactive aerosol particles will be generated, which may influence the decommissioning operation. In the present study, laser cleaning experiments were conducted at the University of Tokyo Aerosol Removal Test Facility to simulate aerosol scavenging during the laser cleaning process. The facility can reproduce multiple phenomena expected in actual plant decommissioning, such as laser decontamination and simultaneous mist and spraying operations. Through the work, we have developed effective aerosol dispersion control methods and strategies based on the joint use of water mist and water spray to reduce radiation risk in either laser cutting or other means of decontamination methods. Preliminary laser cleaning experiments on various coated samples were conducted to assess the aerosol removal efficiency using water droplets and mist. It was verified that the proposed method effectively cleans the radiation hot spots during the decommissioning process.

Validation and application of numerical modeling for in-vessel melt retention in corium pools
Avadhesh Kumar Sharma, Marco Pellegrini, Koji Okamoto, Masahiro Furuya, and Shinya Mizokami
Elsevier BV

NUMERICAL SIMULATION OF AEROSOL GENERATION AND AEROSOL SPRAY SCAVENGING DURING FUKUSHIMA DAIICHI DECOMMISSIONING
Hui Liang, Erkan Nejdet, Kai Wang, Avadhesh Kumar Sharma, and Shunichi Suzuki
American Society of Mechanical Engineers
Abstract In the future decommissioning plan of the damaged Fukushima Daiichi nuclear reactors, the melted and re-solidified fuel debris at the bottom of the reactor pressure vessel and primary containment vessel will be cut into small pieces before retrieving them from reactor buildings. Submicron aerosol particles that generated during cutting operations must be removed inside the containment vessel before they escape to the environment. The existed spray system inside the containment vessel can be used to remove these aerosol particles under different collection mechanisms. In this study, a new numerical model is developed to simulate both the aerosol generation by cutting fuel debris and aerosol removal by spray injection in the open-source CFD code OpenFOAM using the geometry of our model facility (UTARTS facility). Simulation results provide detailed information about the time evolution of aerosol distribution, and also show that aerosol generation rate has no influence on aerosol removal efficiency, and larger particles can be removed faster because of stronger inertial impaction. The newly developed numerical model with considering both aerosol generation due to cut fuel debris and aerosol scavenging by spray droplets can be used in the real-size containment vessel of Fukushima Daiichi nuclear reactors to optimize the design of future spray systems.

Experimental Investigation of Heat Transfer Enhancement on Impinging Jet Cooling Using Surface Laser Treatment
Maheandera Prabu Paulraj, Santosh Kumar Sahu, Avadhesh Kumar Sharma, Anuj Kumar, Karthikeyan Sengadurai, and I. A. Palani
Springer Singapore

Infrared Thermal Imaging Technique for Temperature Measurement in Various Energy Systems
Avadhesh Kumar Sharma, Mayank Modak, Santosh Kumar Sahu, and Manish Kumar Agrawal
Springer Singapore

Effect of Jet Inclination and Coolant Flow Rate on Thermal and Rewetting Behavior during Bottom Jet Impingement on Hot Horizontal Surfaces
Avadhesh Kumar Sharma, Umesh Kumar Lodhi, Gautam Kumar, and Santosh Kumar Sahu
Wiley
The thermal and rewetting behavior of downward‐facing hot surfaces with single upward oblique liquid jet impingement is studied through experimental investigation. The Reynolds number varies in the range of 2500–10 000 and the jet inclination angle varies from 90° to 15°, measured from the horizontal. The current study uses a stainless‐steel foil (SS‐304) with 0.15 mm thickness as the test specimen, and a thermal imaging technique is used to measure temperature data during jet impingement cooling. The initial surface temperature of the test foil is maintained at 500 ± 10 °C and the standoff distance is kept at 6 mm. The Nusselt number is found to increase in the downhill direction and decrease sharply in the uphill direction with the decrease in the inclination angle. The wet‐front velocity is found to increase in the downhill direction with the decrease in the inclination angle. Correlations are proposed for Nusselt number and rewetting temperature as a function of Reynolds number, jet inclination angle, and axial distance.

The thermal and rewetting behavior of hot moving surface by water jet impingement
Avadhesh Kumar Sharma and Santosh Kumar Sahu
Elsevier BV

An experimental study on heat transfer and rewetting behavior of hot horizontal downward facing hot surface by mist jet impingement
Avadhesh Kumar Sharma and Santosh Kumar Sahu
Elsevier BV

RECENT SCHOLAR PUBLICATIONS

Effect of wettability and particle size on aerosol removal efficiency in charged and neutral water spray systems
Z Ahmed, R Kumar, AK Sharma, R Xu, S Miwa, K Okamoto, S Suzuki
Journal of Environmental Chemical Engineering 13 (2), 115822 2025

Improvement of aerosol spray scavenging efficiency by pre-injecting electrically charged water mist
R Xu, AK Sharma, S Miwa, S Suzuki
Journal of Environmental Chemical Engineering 12 (6), 114608 2024

Development of improved spray system with effective electrical electrodes for aerosol removal: An experimental study in UTARTS facility
R Xu, AK Sharma, S Miwa, S Suzuki
Journal of Aerosol Science 181, 106431 2024

Radiation Heating Effects on B4C-SS Eutectic Melting and Its Relocation Behaviour
Z Ahmed, AK Sharma, M Pellegrini, H Yamano, K Okamoto
Arabian Journal for Science and Engineering, 1-11 2024

Kinetic modeling of IG-110 oxidation in inert atmosphere with low oxygen concentration for innovative high-temperature gas-cooled reactor applications
Y Nishimura, A Gubarevich, K Yoshida, AK Sharma, K Okamoto
Journal of Nuclear Science and Technology 61 (6), 802-809 2024

Study on the difference between B4C powder and B4C pellet regarding the eutectic reaction with stainless steel
Z Hong, Z Ahmed, M Pellegrini, H Yamano, N Erkan, AK Sharma, ...
Progress in Nuclear Energy 171, 105160 2024

Eutectic melting and relocation behavior of B4C pellet-stainless steel under radiative heating
Z Ahmed, AK Sharma, M Pellegrini, H Yamano, S Kano, K Okamoto
Ceramics International 50 (10), 17665-17680 2024

Experimental investigation on effective aerosol scavenging using different spray configurations with pre-injection of water mist for Fukushima Daiichi decommissioning
RC Xu, AK Sharma, E Ozdemir, S Miwa, S Suzuki
Nuclear Science and Techniques 35 (5), 42 2024

Modeling passive/active transition in high-temperature dry oxidation of reaction-sintered SiC for innovative fuel matrix in high-temperature gas-cooled reactors
Y Nishimura, A Gubarevich, K Yoshida, AK Sharma, K Okamoto
Journal of the European Ceramic Society 44 (5), 3031-3038 2024

Numerical investigation on improved spray system for efficient aerosol removal during the decommissioning of Fukushima Daiichi nuclear power plants
R Xu, AK Sharma, E Ozdemir, S Miwa, S Suzuki
Nuclear Engineering and Design 419, 112960 2024

Investigation of aerosol generation through laser cleaning of various surfaces and optimization of mist & spray scavenging
AK Sharma, R Xu, Z Ahmed, S Miwa, S Suzuki, A Kosuge
Journal of Aerosol Science 177, 106329 2024

Integrated experimental assessment and validation of oxidation with real-scale SiC fuel compact in HTGR
AK Sharma, W Sagawa, Z Ahmed, Y Nishimura, K Okamoto
International Journal of Heat and Mass Transfer 220, 124930 2024

Radioactive aerosol control and decontamination in the decommissioning of the Fukushima Daiichi nuclear power station
AK Sharma, H Liang, R Xu, E Ozdemir, S Miwa, R Terabayashi, S Suzuki, ...
Nuclear Technology 209 (12), 2030-2043 2023

Visualization Experiments of Radiation Heating on the Eutectic Reaction Between B₄C-SS and Its Relocation Behavior
Z Ahmed, AK Sharma, M Pellegrini, H Yamano, K Okamoto
Saudi International Conference On Nuclear Power Engineering, 198-207 2023

Scavenging of laser-generated aerosols with electrostatic-charged spray droplets
NE Avadhesh Kumar Sharma, Ruicong Xu, Zeeshan Ahmed, Shuichiro Miwa ...
Journal of Aerosol Science 2023

Data Set for Experimental Investigation on Effective Aerosol Scavenging using Different Spray Configurations with Pre-injection of Water Mist for Fukushima Daiichi Decommissioning
R Xu, AK Sharma, E Ozdemir, S Miwa, S Suzuki
(No Title) 2023

Numerical simulation of aerosol generation by cutting fuel debris and aerosol removal by spray droplets during Fukushima decommissioning
H Liang, N Erkan, K Wang, AK Sharma, S Suzuki
Progress in Nuclear Energy 160, 104667 2023

Investigation on aerosol spray scavenging by using a multi-hole nozzle with water mist for decommissioning of Fukushima Daiichi power plants
R XU, AK SHARMA, E OZDEMIR, S MIWA, S SUZUKI, M PELLEGRINI
The Proceedings of the International Conference on Nuclear Engineering 2023

Validation and application of numerical modeling for in-vessel melt retention in corium pools
AK Sharma, M Pellegrini, K Okamoto, M Furuya, S Mizokami
International Journal of Heat and Mass Transfer 196, 123313 2022

Numerical Simulation of Aerosol Generation and Aerosol Spray Scavenging During Fukushima Daiichi Decommissioning
H Liang, E Nejdet, K Wang, AK Sharma, S Suzuki
International Conference on Nuclear Engineering 86441, V009T09A003 2022

MOST CITED SCHOLAR PUBLICATIONS

An experimental study on heat transfer and rewetting behavior of hot horizontal downward facing hot surface by mist jet impingement
AK Sharma, SK Sahu
Applied Thermal Engineering 151, 459-474 2019
Citations: 26

An experimental investigation on heat transfer enhancement in circular jet impingement on hot surfaces by using Al₂O₃/water nano-fluids and aqueous high
M Modak, AK Sharma, SK Sahu
Experimental Heat Transfer 31 (4), 275-296 2018
Citations: 26

The heat transfer characteristics and rewetting behavior of hot horizontal downward facing surface by round water jet impingement
AK Sharma, M Modak, SK Sahu
Applied Thermal Engineering 138, 603-617 2018
Citations: 26

The thermal and rewetting behavior of hot moving surface by water jet impingement
AK Sharma, SK Sahu
Applied Thermal Engineering 159, 113950 2019
Citations: 18

Dynamics and control of energy systems
A Mukhopadhyay, S Sen, DN Basu, S Mondal
Springer Nature 2019
Citations: 13

Experimental Investigation of Rewetting During Quenching of Hot Surface by Round Jet Impingement Using Al₂O₃–Water Nanofluids
AK Sharma, M Modak, SK Sahu
International Conference on Nuclear Engineering 50039, V003T09A056 2016
Citations: 9

Effect of Jet inclination and Coolant Flow Rate on Thermal and Rewetting Behavior during Bottom Jet Impingement on Hot Horizontal Surface
SKS Avadhesh K Sharma, Umesh K Lodhi, Gautam Kumar
Steel Research International 2019
Citations: 8

Scavenging of laser-generated aerosols with electrostatic-charged spray droplets
NE Avadhesh Kumar Sharma, Ruicong Xu, Zeeshan Ahmed, Shuichiro Miwa ...
Journal of Aerosol Science 2023
Citations: 7