2005 Fiscal Year Final Research Report Summary
Control of the rhelogical properties of viscoelastic fluids with submicron particles and its application of energy saving for fluid transportation system
| Project/Area Number |
16560658
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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 |
Properties in chemical engineering process/Transfer operation/Unit operation
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| Research Institution | Yamaguchi University |
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Principal Investigator |
SAEKI Takashi Yamaguchi University, Applied Chemistry and Chemical Engineering, Associate professor, 工学部, 助教授 (30253165)
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| Project Period (FY) |
2004 – 2005
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| Keywords | Drag Reduction / Surfactant / Rheology / Heat Transfer Reduction / Rod-like Micelle / Energy Saving / Fluid Transportation |
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| Research Abstract |
Drag reduction caused by surfactant solutions is considered to be an effective way to reduce the running cost in closed-loop district heating and cooling systems. Many researches of drag reduction have been highly developed in recent years, however, there are few researches about the application of drag reduction. We have developed a suitable drag-reducing additives (LSP-01) and applied it for more than ninety practical air conditioning systems in Japan. Several problems encountered in the application are 1) changing rate of concentrations of surfactant and counter ion during long term use, 2) some corrosion inhibitors and oils blocked the drag reduction, 3) heat transfer reduction occurs simultaneously, and so on. It is also necessary to develop more effective additives, especially could be used for wide temperature range. In this project, different surfactants and counter ions and their combinations were examined experimentally and a suitable additive condition, which could expand effective temperature range of drag reduction, is proposed.
Drag reduction and heat transfer characteristics were also measured for several drag-reducing additives with different surfactants and concentrations, particularly at higher temperature range, that cross the upper limit temperature of drag reducing solutions. Information at this higher temperature range is necessary for design and operation of heating processes.
Finally, measurement of the elongational viscosity of some drag-reducing surfactant solutions was carried out by using a spinning-type equipment produced in this project. The experimental results indicated that enough amount of the elongational viscosity is necessary to maintain stable drag reduction. The effect of shear induced state (SIS) and hysteresis of the equilibrium flow curve on the mechanism of drag reduction was also considered in this project.
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