| Project/Area Number |
15560149
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Fluid engineering
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| Research Institution | Tokyo Metropolitan University |
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Principal Investigator |
HOSHINO Daisuke Tokyo Metropolitan University, Graduate School of Engineering, Research Associate, 工学研究科, 助手 (80106616)
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| Co-Investigator(Kenkyū-buntansha) |
OTA Masahiro Tokyo Metropolitan University, Graduate School of Engineering, Professor, 工学研究科, 教授 (80094259)
NAGAHAMA Kunio Tokyo Metropolitan University, Graduate School of Engineering, Professor, 工学研究科, 教授 (80087311)
KATO Satoru Tokyo Metropolitan University, Graduate School of Engineering, Associate Professor, 工学研究科, 助教授 (70126316)
NORITOMI Hidetaka Tokyo Metropolitan University, Graduate School of Engineering, Researh Associate, 工学研究科, 助手 (20237895)
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| Project Period (FY) |
2003 – 2004
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| Project Status |
Completed (Fiscal Year 2004)
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| Budget Amount *help |
¥2,900,000 (Direct Cost: ¥2,900,000)
Fiscal Year 2004: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 2003: ¥2,400,000 (Direct Cost: ¥2,400,000)
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| Keywords | nano liquid clathrate / hydrate slurry / latent heat transfer / tetra-n-butylammonium bromide / congruent melting point / ice nucleating agent / supercooling / amino acid |
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| Research Abstract |
Research results (1); the nano-liquid clathrate slurry solution used in the present research was a slurry of liquid clathrate hydrate and aqueous solution. Tetra-n-butylammonium bromide (TBAB) was used in the guest molecules of the hydrate (nano-liquid clathrate). In-depth experiments were carried out using a differential thermometer to investigate the relation between the formation temperature and the concentration of the solution, as well as the congruent melting point, the latent heat, the production speed and the supercooling phenomenon. Analysed and corrected average initial melting temperatures and average melting enthalpy, together with average initial freezing temperatures and average freezing enthalpy were determined from the melting curve as shown by the differential thermometer. The effects of supercooling dissolution by the agitator blade were considered by looking at the relation between the revolution speed of the agitator blade and the onset temperature of ice nucleus fo
… More
rmation. The effect of the ice nucleating agent was investigated with a rotation speed of the blade of 150 rpm, and it was found that without the ice nucleating agent the onset temperature for ice nucleus formation was in the region of 2.5 degrees, whereas when the ice nucleating agent was added, the onset temperature rose to somewhere around 10.3 degrees, which is a remarkable effect.
Research results (2): trial production of a nano-liquid clathrate slurry flow mechanism. The experimental mechanism was composed of slurry formation, a flow element, and a heat exchange element. It was shown experimentally that the nano-liquid clathrate hydrate slurry could be used in air conditioning.
Through this present research the following two points have emerged as subjects for future research:
(A) When agitation is used in hydrate formation, hydrate crystals grow as a thin film on the wall of the agitation instrument.
(B) Establishing an experimental method for determining the filling rate in hydrate slurry.
These two points will be the subject of on-going research. Also, on-going research will look at particle size distribution, shape, viscosity, density, pipe friction pressure coefficients and also Reynolds numbers, with consideration to the filling rate of hydrate slurry, which is its fundamental property. Less
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