Search Results 1-12 of 12

  • PERFORMANCE VERIFICATION BASED ON MEASUREMENTS AND UNSTEADY CFD ANALYSIS THAT LOW CALCULATION LOAD FOR 8 YEARS:Pre-cooling / heating characteristics of the earth-to-air heat exchanger system in long-term operation (Part1)  [in Japanese]

    MUTA Akitoshi , SHIRAISHI Yasuyuki , TOMODA Kento

    … In order to estimate the pre-cooling / heating effects of EAHE, it is desirable to estimate by coupled simulation of three-dimensional CFD analysis in air channel and heat conduction analysis of underground soil for long terms since underground pit has complicated shape. …

    Journal of Environmental Engineering (Transactions of AIJ) (750), 711-718, 2018-08

    J-STAGE  AIJ 

  • Greenhouse gas emission from the Facility of Cattle Wastewater Treatment with Activated-Sludge process  [in Japanese]

    SHIRAISHI Makoto , OSADA Takashi , MIZUKI Takeshi , TAKATORI Kenji

    <p>牛舎排水浄化処理施設から排出される温室効果ガス(GHG)を実測し,GHG発生要因の解明を行うとともに精確な排出係数の算定を実施した.試験は岡山県農林水産総合センター畜産研究所内の曝気槽(24m<sup>3</sup>)と沈殿槽(2.6m<sup>3</sup>)からなる,乳牛40頭規模の連続式活性汚泥浄化処理施設で行った(35.02 …

    Nihon Chikusan Gakkaiho 88(4), 479-490, 2017

    J-STAGE  JASI 

  • Evaluation of Thermal Hydraulics Characteristics of Natural Cooling Low Level Radioactive Waste Storage System  [in Japanese]

    YOSHII Toshihiro , IWAKI Chikako , KOYAMA Tomonori , USUI Nobuhiko , WATANABE Hisao , IKEDA Tatsumi , IKEDA Hiroshi , MASAKI Yoshikazu

    … It consists simply of a storage pit for radioactive waste and air inlet and outlet ducts. … Therefore, the pressure drop and flow pattern in the waste storage pit are important flow characteristics. … In this study, the pressure drop and air temperature distribution, greatly influenced by the flow pattern in the pit, were measured using a 1/5 scale model and compared with the results obtained from CFD. …

    Transactions of the Atomic Energy Society of Japan 11(1), 91-100, 2012-03-01

    J-STAGE  References (5)

  • DYNAMIC EVALUATION OF HEAT TRANSFER CHARACTERISTICS IN UNDERGROUND PIT IN SUMMER AND WINTER BASED ON CFD ANALYSIS:Evaluation method of cooling and heating effect of an earth-to-air heat exchanger (Part1)  [in Japanese]

    ASHITANI Yumi , SHIRAISHI Yasuyuki , YASUNAGA Ryuichi , RYU Yuji

    … In order to evaluate the cooling and heating effect of underground pit as one of the Earth-to-Air Heat Exchangers for diurnal cycle, unsteady CFD simulations for the pit of an office building in summer and winter were carried out using the results of one dimensional heat conduction analysis for underground in vertical direction as initial condition. …

    Journal of Environmental Engineering (Transactions of AIJ) 77(677), 575-582, 2012

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  • Evaporation Heat Flux from Hot Water to Air Flow

    YANAGI Chihiro , MURASE Michio , YOSHIDA Yoshitaka , IWAKI Takanori , NAGAE Takashi , KOIZUMI Yasuo

    … In order to evaluate evaporation heat fluxes from coolant water in a spent fuel pit of a nuclear power plant to ventilation air during a shutdown of water purification and cooling systems, empirical correlations were derived. … In this study, a correlation including length scale was derived using the database under the outlet relative humidity less than 100% (<i>X<sub>out</sub></i> …

    TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 78(786), 363-372, 2012

    J-STAGE  Cited by (1)

  • INJECTION OF HIGHLY OXYGENENATED WATER INTO THE BOTTOM OF DREDED AREA IN LAKE NAKAUMI  [in Japanese]

    MASUKI Shingo , YAJIMA Hiroshi , SEIKE Yasushi

    … In Yonago Bay, we selected two adjacent dredged pits, then installed and operated the WEP system in one pit for the experimental purpose. … The other pit was used for the control purpose. …

    Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering) 67(4), I_1525-I_1530, 2011

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  • Evaluation of Runoff Detention Function of the Paddy Field Installed with Runoff Control Devices  [in Japanese]

    YOSHIKAWA Natsuki , NAGAO Naoki , MISAWA Shin-ichi

    新潟県村上市神林地区では,洪水常襲地区の上流域に広がる水田に「落水量調整板」を設置し,大雨時に水田に意図的に雨水を貯留することで洪水緩和を図るという「田んぼダム」の取り組みが行われている.本研究では,この落水量調整板による水田からのピーク流出抑制機能を水田耕区スケールで検証した.水田からの流出量は,湛水状態の場合,この落水量調整板の孔(オリフィス)と排水マス入り口に設置されたせき板(四角せき)によ …

    Transactions of The Japanese Society of Irrigation, Drainage and Rural Engineering 77(3), 263-271, 2009-06-25

    J-STAGE  References (8) Cited by (4)

  • Development of an On-line Low Gas Pressure Cell for Laser Ablation-ICP-Mass Spectrometry

    HIRATA Takafumi

    … The degree of sample re-deposition around the ablation pit could be reduced when the pressure of the ambient gas was lower than 50 kPa. … Produced sample aerosol was drawn and taken from the outlet of the diaphragm pump, and directly introduced into the ICP ion source. …

    Analytical Sciences 23(10), 1195-1201, 2007

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  • EXPERIMENTAL STUDY OF AIR ENTRAINMENT AND FLOW IN OUTLET PIT

    OCHIAI Minoru , ENDO Shigekatsu , WADA Akira

    … The characteristics of the circulation flow were investigated for the water flow with the air entrainment slightly from the free water surface in a three-dimensional rectangular outlet pit. … At first, the air entrainment pattern was classified into two types by the visual observations.<BR>Measurement of the flow velocity distribution in the pit revealed that the dominant types of flow include circulating flow and vertical eddies. …

    PROCEEDINGS OF HYDRAULIC ENGINEERING (49), 835-840, 2005

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  • Numerical Analysis of Self-Excited Free Surface Sloshing in an Outlet Pit

    TANAKA Nobukazu , FUKUHARA Kaichi

    … Although self-excited sloshing phenomena of free surface are sometimes observed in an outlet pit of electric power plants, the onset mechanisms are not clearly understood. …

    PROCEEDINGS OF HYDRAULIC ENGINEERING (40), 687-692, 1996

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  • Some Problems on the Design of Refractories of Bottom Casting Pit:Studies on the Fire Clay Refractories for Casting Pit, III  [in Japanese]

    SASAKI Shigeichi

    … pattern of the flow of molten steel in bottom casting pit, in which steel flows out of nozzle into the opening of runner bricks and then into mould.<br>This paper concerns the study of the flow patterns of molten steel in the bottom casting based on the theory of classical hydrodynamics as well as the results of some experimental measurements.<br>Considerations have been given to the relations between the variation of both openings of the inlet and the outlet side of the nozzles, and the distance of lifting the …

    Journal of the Ceramic Association, Japan 70(802), 272-284, 1962

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  • ON THE FLOW IN A LIMITED FIELD : SECOND REPORT

    IHARA Sadatoshi

    … Thus, the author studies, as an example of the above flow, the manner of motion of water with a whirling in the draft tube pit of a water trubine. … The results of calculations agree well with those of gentle flow in the experiments with a model pit and draft tube carried out by the author in the Hydraulic laboratory of Waseda University and the experiments show that the characteristics yet remain even in the agitational flow. …

    Journal of the Society of Mechanical Engineers 32(143), 121-135, 1929

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