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1. Direct numerical simulation of a high-Froude-number turbulent open-channel flow

Author

40301832, Yamamoto, Yoshinobu, Kunugi, Tomoaki, 40301832, Yamamoto, Yoshinobu, and Kunugi, Tomoaki

Abstract

In this study, we successfully conducted a direct numerical simulation of a high-Fr turbulent open-channel flow at a Froude number of 1.8 and a Reynolds number of 2325 based on bulk velocity, gravitational acceleration, water depth, and kinetic viscosity, using the multi-interface advection and reconstruction solver (MARS). We confirmed that typical wall-bounded turbulent structures were observed in this high-Fr open-channel flow. On the other hand, near free-surface, surface deformations are constituted of large-scale gentle bumpy waves with the maximum wave height corresponding to approximately 4% of the water depth and small-scale isotropic waves on the large-scale waves. The large-scale waves would generate the high-speed streaky structures near the free-surface and the scale of the small waves would be equivalent to the near free-surface turbulent kinetic energy. Near the free-surface, wall-normal turbulent intensity and energy-dissipation rates increase toward the free-surface, and the tendencies of turbulent statistical quantities near the free-surface are in good agreement with the experimental measurements obtained using a laser Doppler anemometer (LDA) (Nakayama and Nezu, "Bursts near the free-surface in open-channel flows and their relationships with turbulence structures, " J. Hydraulic, Coastal and Environmental Eng. JSCE 635/II, 31 1999). As well as the rigid-lid turbulent open-channel flow, turbulent intensity distribution from the vertical component to the streamwise one is predominant beneath the free-surface.

Published
2011

2. Macroscopic wettability based on an interfacial jump condition

Author

40301832, Yonemoto, Yukihiro, Kunugi, Tomoaki, 40301832, Yonemoto, Yukihiro, and Kunugi, Tomoaki

Abstract

Young's equation, describing an interfacial equilibrium condition of a liquid droplet on a smooth solid surface, raises issues concerning the existence of a sine term which has not yet been resolved theoretically and continues to be discussed to the present day. From a thermodynamics viewpoint, the equilibrium condition arises by minimizing the total free energy of the system while intensive parameters are kept constant. In the derivation, variations in the virtual work in both horizontal and vertical directions of the droplet on the smooth solid are considered. From a hydrodynamics viewpoint, there is a momentum jump condition at the gas-liquid interface that is derived based on a mechanical balance. Using standard mathematical procedures such as Stokes' theorem and differential geometry, a test volume is considered across the interface between two continuous phases from which the jump condition is derived. In the present paper, Young's equation is revisited from the point of view of the momentum jump condition at the two-phase interface and a modified Young's equation is derived. The analytical solution derived from the modified Young's equation is then used to compare theory with experimental data. The line tension and contact angle for a lens droplet are also discussed on the basis of this model.

Published
2010

8. ACTIVITIES ON THE LASER FUSION REACTOR KOYO-F IN JAPAN

Author

40301832, Norimatsu, T., Shimada, Y., Furukawa, H., Kunugi, T., Nakajima, H., Kajimura, Y., Tsuji, R., Yoshida, H., Mima, K., 40301832, Norimatsu, T., Shimada, Y., Furukawa, H., Kunugi, T., Nakajima, H., Kajimura, Y., Tsuji, R., Yoshida, H., and Mima, K.

Published
2009

11. Heat transfer bibliography - Japanese works 2006

Author

50166964, 40301832, 10201451, 00314229, Yoshida, H, Maruyama, S, Takeishi, K, Kunugi, T, Kawara, Z, Iwai, H, Saito, M, Oda, Y, 50166964, 40301832, 10201451, 00314229, Yoshida, H, Maruyama, S, Takeishi, K, Kunugi, T, Kawara, Z, Iwai, H, Saito, M, and Oda, Y

Published
2008

12. Heat transfer bibliography - Japanese works 2005

Author

50166964, 40301832, 10201451, 00314229, 90314236, Yoshida, H, Maruyama, S, Takeishi, K, Kunugi, T, Kawara, Z, Iwai, H, Saito, M, Oda, Y, 50166964, 40301832, 10201451, 00314229, 90314236, Yoshida, H, Maruyama, S, Takeishi, K, Kunugi, T, Kawara, Z, Iwai, H, Saito, M, and Oda, Y

Published
2008

13. Development of advanced blanket performance under irradiation and system integration through JUPITER-II project

Author

40301832, Abe, K., Kohyama, A., Tanaka, S., Namba, C., Terai, T., Kunugi, T., Muroga, T., Hasegawa, A., Sagara, A., Berk, S., Zinkle, S. J., Sze, D. K., Petti, D. A., Abdou, M. A., Morley, N. B., Kurtz, R. J., Snead, L. L., Ghoniem, N. M., 40301832, Abe, K., Kohyama, A., Tanaka, S., Namba, C., Terai, T., Kunugi, T., Muroga, T., Hasegawa, A., Sagara, A., Berk, S., Zinkle, S. J., Sze, D. K., Petti, D. A., Abdou, M. A., Morley, N. B., Kurtz, R. J., Snead, L. L., and Ghoniem, N. M.

Published
2008

32. Heat transfer bibliography - Japanese works 2003

Author

50166964, 40301832, 10201451, 00314229, 90314236, Suzuki, K, Nishio, S, Yoshida, H, Takeishi, K, Kunugi, T, Kawara, Z, Iwai, H, Saito, M, Oda, Y, 50166964, 40301832, 10201451, 00314229, 90314236, Suzuki, K, Nishio, S, Yoshida, H, Takeishi, K, Kunugi, T, Kawara, Z, Iwai, H, Saito, M, and Oda, Y

Published
2006

36. Heat transfer bibliography - Japanese works 2004

Author

50166964, 40301832, 10201451, 00314229, 90314236, Suzuki, K, Nishio, S, Yoshida, H, Takeishi, K, Kunugi, T, Kawara, Z, Iwai, H, Saito, M, Oda, Y, 50166964, 40301832, 10201451, 00314229, 90314236, Suzuki, K, Nishio, S, Yoshida, H, Takeishi, K, Kunugi, T, Kawara, Z, Iwai, H, Saito, M, and Oda, Y

Published
2006

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