著者

深谷 淳司 相江 隆広 谷川 洋文 鶴田 隆治

出版者

一般社団法人 日本機械学会

雑誌

熱工学コンファレンス講演論文集 2019 (ISSN:2424290X)

巻号頁・発行日

pp.0136, 2019 (Released:2020-04-25)

著者

福留 功二 塚原 隆裕 守 裕也 山本 誠

出版者

一般社団法人 日本機械学会

雑誌

熱工学コンファレンス講演論文集 2020 (ISSN:2424290X)

巻号頁・発行日

pp.0142, 2020-10-09 (Released:2021-03-17)

---

Direct numerical simulations (DNSs) were performed to study the dissimilarity between the heat and momentum transfer of turbulent spot structures developing in a laminar plane Couette flow. The turbulent spot was generated by pair vortices, and the Reynolds and Prandtl numbers were 450 and unity, respectively. Three types of computational domains were examined to reveal the effect of the spot development on the dissimilarity. As a result, we confirmed that the effective heat transfer state is obtained for developing a turbulent spot rather than a fully developed state. It attains the maximum when the turbulent spot grows the half size of the computational domain. Moreover, much effective heat transfer state was obtained for developing in streamwise direction rather than in spanwise direction.

著者

高口 祥平 高橋 秀治 木倉 宏成

出版者

一般社団法人 日本機械学会

雑誌

熱工学コンファレンス講演論文集 2020 (ISSN:2424290X)

巻号頁・発行日

pp.0180, 2020-10-09 (Released:2021-03-17)

---

In Japan, high-level radioactive liquid waste is vitrified in Joule-heated glass melter. Natural convection in glass melter is predicted by numerical calculations for stable operation. Since molten glass is a highly viscous fluid, implicit methods are used in numerical calculations. However, cold cap above the molten glass shows a large spatial variation in viscosity. Therefore, using the implicit method to compute the cold cap takes a long time. In this study, we focus on Variable Inertia Method that can compute natural convection of highly viscous fluids in the explicit method and verify its applicability to glass melter.