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Journal Articles

Lattice Boltzmann modeling and simulation of forced-convection boiling on a cylinder

Saito, Shimpei*; De Rosis, A.*; Fei, L.*; Luo, K. H.*; Ebihara, Kenichi; Kaneko, Akiko*; Abe, Yutaka*

Physics of Fluids, 33(2), p.023307_1 - 023307_21, 2021/02

 Times Cited Count:2 Percentile:90.05(Mechanics)

A Boiling phenomenon in a liquid flow field is known as forced-convection boiling. We numerically investigated the boiling system on a cylinder in a flow at a saturated condition. To deal with such a phenomenon, we developed a numerical scheme based on the pseudopotential lattice Boltzmann method. The collision was performed in the space of central moments (CMs) to enhance stability for high Reynolds numbers. Furthermore, additional terms for thermodynamic consistency were derived in a CMs framework. The effectiveness of the model was tested against some boiling processes, including nucleation, growth, and departure of a vapor bubble for high Reynolds numbers. Our model can reproduce all the boiling regimes without the artificial initial vapor phase. We found that the Nukiyama curve appears even though the focused system is the forced-convection system. Also, our simulations support experimental observations of intermittent direct solid-liquid contact even in the film-boiling regime.

Journal Articles

Comparative molecular dynamics study on tri-$$n$$-butyl phosphate in organic and aqueous environments and its relevance to nuclear extraction processes

Mu, J.*; Motokawa, Ryuhei; Williams, C. D.*; Akutsu, Kazuhiro*; Nishitsuji, Shotaro*; Masters, A. J.*

Journal of Physical Chemistry B, 120(23), p.5183 - 5193, 2016/06

 Times Cited Count:21 Percentile:62.48(Chemistry, Physical)

Oral presentation

Technology development to evaluate dose rate distribution and to search for fuel debris submerged in water for decommissioning of Fukushima Daiichi Nuclear Power Station, 9; Tank tests of ROVs to map the debris in the primary containment vessel

Kamada, So*; Kato, Michio*; Nishimura, Kazuya*; Nancekievill, M.*; Jones, A. R.*; Lennox, B.*; Joyce, M. J.*; Okumura, Keisuke; Katakura, Junichi*

no journal, , 

As a part of technology development related to fuel debris exploration technology in the reactor containment vessel, demonstration tests of an remotely operated vehicle (ROV) for investigating the distribution and surface condition of submerged fuel debris were carried out by using the test water tank of Naraha Remote Technology Development Center of Japan Atomic Energy Agency and using the TRIGA Mark II research reactor of Jozef Stefan Institute of Slovenia. In the demonstration test, we confirmed the cooperation with the acoustic exploration device, the performance of the ROV positioning system, the operation in the reactor pool, and showed that it is possible to display 3D image of the shape of simulated fuel debris.

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