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Flow characteristics and rheological properties of propane hydrate slurry
Ryosuke Uchida,Takashi Morimoto,Hiroyuki Kumano 대한설비공학회 2018 대한설비공학회 학술발표대회논문집 Vol.2018 No.6
Propane hydrate is crystalline solids resulting from the arrangement of water molecules linked by hydrogen bonds constituting cages around propane molecules. The propane hydrate slurry is composed of water and fine propane hydrate crystals, and is attracting as transportation and storage medium of the propane. In this study, the flow characteristics and rheological properties of the propane hydrate slurry in a circular tube were investigated. The hydrate volume fraction and the flow rate of the slurry were varied as experimental parameters. As a result, it was found that the pressure drop increases with the solid fraction and the flow rate. Furthermore, in order to evaluate the rheological properties, the relationship between shear stress and shear rate was also discussed. From the results, the propane hydrate slurry could be regarded as a Bingham fluid. Finally, the correlation to predict the apparent viscosity and the yield stress was proposed as a function of the volume fraction. Moreover, it was found that solid phase doesn’t affect the flow characteristics of the hydrate slurry in turbulent flow region.
Wideband InterNetworking Engineering Test and Demonstration Satellite (WINDS) system
Kuramasu, Ryoichi,Araki, Tsunehiko,Shimada, Masaaki,Satoh, Tesuo,Tomita, Eiichi,Futamata, Ryosuke,Kuroda, Tomonori,Yajima, Masanobu,Maeda, Tsuyoshi,Uchida, Hideki,Mukai, Tatsuya,Kadowaki, Naoto,Nakao, 통신위성우주산업연구회 2002 Joint Conference on Satellite Communications Vol.2002 No.-
In April 2001 NASDA launched a new project called "WINDS", Wideband InterNetworking engineering test and Demonstration Satellite, to realize the requirement of Japanese Cabinet IT strategy called "e-Japan Priority Policy Program". The WINDS project is aimed at demonstrating technologies necessary to construct the satellite-based ultra high=speed global fixed wireless communications networks. Based on this objective, NASDA works with CRL to develop the WINDS experiment system to be launched in FY 2005. The WINDS experiment system is planned to demonstrate various experiments, using newly key technology such as multi-beam antenna/multi-port amplifier, Ka band active phased array antenna, on-board ATM switch and so on. This paper describes the concept and outline of the WINDS network experiment system.