• Title, Summary, Keyword: 유체점성

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Characteristics of Li-ion battery using polymeric gel electrolytes reinforced with glass fiber cloth (유리섬유 cloth가 보강된 겔상의 고분자 필름을 전해질로 이용한 리튬이온 전지의 특성)

  • Park Ho Cheol;Kim Sang Hern;Chun Jong Han;Ko Jang Myoun;Jo Soo Ik;Sohn Hun-Joon
    • Journal of the Korean Electrochemical Society
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    • v.3 no.2
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    • pp.100-103
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    • 2000
  • Polymeric gel electrolytes based on polyacrylronitile blended with poly(vinylidene fluoride-co-hexafluoro-propylene)(P(VdF-co-HFP), which were reinforced with glass fiber cloth(GFC) to increase the mechanical strength, were prepared for the practical use in secondary battery. Test cell consisting of $LiCoO_2$ as a cathode and mesophase pich-based ca.bon fiber (MCF) as an anode material showed a capacity of 110 mAh/g based on the cathode weight at 0.2C rate at room temperature. Over $80\%$ of initial capacity was retained after 400cycles, indicating that GFC is suitable for a reinforcing material to increase the mechanical strength of gel based electrolytes.

Rheological Properties of Bitumen for Reducing Negative Skin Friction (말뚝 부마찰력 저감용 역청재료의 유변학적 특성)

  • 박태순;윤수진
    • Journal of the Korean Geotechnical Society
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    • v.19 no.4
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    • pp.191-200
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    • 2003
  • This paper presents the rheological properties of bitumen for reducing negative skin friction. The bitumen has been widely used due to both the cost and construction effectiveness. Also, it is well known that the use of bitumen for reducing negative skin friction renders the best results among other available methods. Three different modified bitumens were used for the testing programs. The physical tests include the penetration, the softening point and penetration index. The rheological tests include phase angle, complex modulus, creep tests and flow tests. The tests were conducted at four different temperatures(15, 30, 45 and 6$0^{\circ}C$) in order to simulate the field condition. The test results were analyzed using the phase angle, G$^*$/sin $\delta$, creep compliance and shear viscosity. The result of tests showed that the phase angle increased and G$^*$/sin $\delta$ decreased with the increase of temperature. The creep compliance increased as the loading time increased. The difference of the creep compliance is detected as the time and temperature are varied, however, the difference of the shear viscosity is not significant among the samples tested in this study. The rheological properties of the bitumen also showed that the physical testing method and the temperature dependant testing method are somewhat limited to showing and expressing the full rheological properties of the modified bitumen. The introduction of the time and the temperature dependent testing method is necessary to find out the full rheological properties of the modified bitumen.

Studies on the Viscometric Behavior of Mayonnaise (마요네즈의 점성(粘性)에 관(關)한 연구(硏究))

  • Lee, Yung-Yup
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.15 no.2
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    • pp.119-127
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    • 1986
  • The rheological properties of mayonnaise were studied with cylindrindrical viscometer. It was observed that mayonnaise showed pseudoplastic behavior, yield stress and time dependent characteristics. In the initial period of shear time, the decay of viscosity of mayonnaise was followed by a second-order kinetic equation. The influence of temperature on viscosity could be described by Arrhenius equation. The apparent viscosity of mayonnaise markedly increased with an rise in the concentration of egg yolk; and the emulsion was most stable at the concentration of 12%. At the concentration of $65{\sim}75%$ oil, the apparent viscosity was increased; the maximum value was reached at 75% oil, and above 75% oil, the remarkable decreased was observed. The size of oil drops was decreased with an increase in oil concentration of 75% oil. The apparent viscosity of mayonnaise was increased with an rise in water contents, while being decreased with one in the concentration of vinegar.

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Rheological Properties of Biopolymer Produced by Alkali-Tolerant Bacillus sp. (알카리 내성 Bacillus sp.가 생산하는 생물 고분자의 리올로지적 성질)

  • Lee, Shin-Young;Kim, Jin-Young;Shim, Chang-Sub
    • Korean Journal of Food Science and Technology
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    • v.28 no.3
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    • pp.538-544
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    • 1996
  • A highly viscous biopolymer from alkali-tolerant Bacillus sp. was purified and its rheological properties were studied. 1% (w/v) solution of purified biopolymer showed pseudoplastic fluid behavior with the yield stress similar to those of xanthan and guar gum, and its consistency index was exponentially dependent on concentration and temperature. The concentration dependency of consistency index exhibited two rectilinear plots with different slopes at 1% concentration and pseudoplastic property increased with the increase of biopolymer concentration. The biopolymer solution exhibited a low temperature dependency and the activation energy of flow was 1.16 kacl/g mol. The apparent viscosity was very dependent on the change of pH and the addition of salt. However, no organic solvent effects were observed effects of viscosity synergism with the addition of viscosifier were not observed.

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Effect of Flow Liners on Ship′s Wake Simulation in a Cavitation Tunnel (캐비테이션 터널에서의 반류분포 재현에 미치는 유동조절체의 영향)

  • Jin-Tae Lee;Young-Gi Kim
    • Journal of the Society of Naval Architects of Korea
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    • v.30 no.2
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    • pp.66-75
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    • 1993
  • Flow control devices, such as flow liners, are frequently introduced hi a cavitation tunnel in order to reduce the tunnel blockage effect, when a three-dimensional wake distribution is simulated using a complete ship model or a dummy model. In order to estimate the tunnel wall effect and to evaluate the effect of flow liners on the simulated wake distribution, a surface panel method is adopted for the calculation of the flow around a ship model and flow liners installed in a rectangular test section of a cavitation tunnel. Calculation results on the Sydney Express ship model show that the tunnel wall effect on the hull surface pressure distribution is negligible for less than 5% blockage and can be appreciable for more than 20% blockage. The flow liners accelerate the flow near the after body of the ship model, so that the pressure gradient there becomes more favorable and accordingly the boundary layer thickness would be reduced. Since the resulting wake distribution is assumed to resemble the full scale wake, flow liners can also be used to simulate an estimated full scale wake without modifying the ship model. Boundary layer calculation should be incorporated in order to correlate the calculated wake distribution with tole measured one.

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Comparison of 1-g and Centrifuge Model Tests for Similitude Laws (상사법칙 검증을 위한 1-g 모형실험과 원심모형실험의 비교 연구)

  • Kim Sung-Ryul;Hwang Jae-Ik;Kim Myoung-Mo;Ko Hon-Yim
    • Journal of the Korean Geotechnical Society
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    • v.22 no.5
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    • pp.59-67
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    • 2006
  • The centrifuge and 1-g shaking table tests were performed simultaneously to compare the dynamic behaviors of loose sands of the same geotechnical properties. The prototype soils were 10 m thick liquefiable loose sands. The geometric scaling factors were 20 for 1-g and 40 for centrifuge tests. The excess pore pressure, surface settlement, and acceleration in the soil were measured at the same locations in the 1-g and centrifuge tests. The total excess pore pressure from development to dissipation was measured. In the centrifuge test, viscous fluid was used as the pore water to eliminate the time scaling difference between dynamic time and dissipation time. In the 1-g tests, the steady state concept was applied to determine the unit weight of the model soil, and two different time scaling factors were applied for the dynamic time and the dissipation time. It is concluded that the 1-g tests can simulate the excess pore pressure of the prototype soil if the permeability of the model soil is small enough to prevent dissipation of excess pore pressure during shaking and the dissipation time scaling factor is properly determined.

Physicochemical Properties of a Low Calorie Sweetener, Tagatose (저열량 감미료 Tagatose의 이화학적 특성)

  • Roh, Hoe-Jin;Kim, Sang-Yong;Kim, Suk-Shin;Oh, Deok-Kun;Han, Kee-Young;Noh, Bong-Soo
    • Korean Journal of Food Science and Technology
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    • v.31 no.1
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    • pp.24-29
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    • 1999
  • The physicochemical properties of tagatose, a low calorie sweetener, was investigated. Rheological property of tagatose solution was found to be Bingham fluid. As the concentration of tagatose increased from 10 to 50% at $25^{\circ}C$, the viscosity increased from 1.65 to 5.14 cp. When the temperature of 40% tagatose solution increased from 15 to $55^{\circ}C$, the viscosity decreased from 4.59 to 2.33cp. The melting onset temperature and endothermic enthalpy of tagatose were $130.4^{\circ}C$ and -202.3 J/g, respectively, which were obtained from the analysis of differential scanning calorimetry. Tagatose showed higher water absorption than sucrose under $85{\sim}100%$ of relative humidity. Tagatose was less soluble than sucrose at $20{\sim}70^{\circ}C$. Water activity of tagatose in 60% concentration was 0.892, which was lower than 0.957 of sucrose solution. Tagatose solution adjusted from pH 2 to pH 12 was stable after 3 days. Amount of tagatose was not changed after heat treatment at $154^{\circ}C$ for 4 hours. But a browning reaction was found and absorbance of a tagatose solution increased with heat treatment.

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Intraaneurysmal Blood Flow Changes for the Different Coil Locations (코일 위치에 따른 동맥류 내부 혈류유동의 변화)

  • 이계한;정우원
    • Journal of Biomedical Engineering Research
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    • v.25 no.4
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    • pp.295-300
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    • 2004
  • Coil embolization technique has been used recently to treat cerebral aneurysms. When a giant or a multilobular aneurysm are treated by roils, filling an aneurysm sac completely with coils is difficult and partial blocking of an aneurysm sac is inevitable. Blood flow characteristics, which nay affect the embolization process of an aneurysm sac, are changed by the locations of coils for the Partially blocked aneurysms. Blood flow fields are also influenced by the geometry of a parent vessel. In order to suggest the coil locations effective for aneurysm embolization, the blood flow fields of lateral aneurysm models were analyzed for the different coil locations and parent vessel geometries. Three dimensional pulsatile flow fields are analyzed by numerical methods considering non-Newtonian viscosity characteristics of blood. Flow rate into the aneurysm sac (inflow rate) and wall shear stress, which are suspected as flow dynamic factors influencing aneurysm embolization, are also calculated. Inflow rates were smaller and the low wall shear stress zones were larger in the neck blocked models compared to the dome blocked models. Smaller inflow and larger low wall shear stress zones in the distal neck blocked model imply that the distal neck should be the effective coil locations for aneurysm embolization.

Development of 3-D Nonlinear Wave Driver Using SPH (SPH을 활용한 3차원 비선형 파랑모형 개발)

  • Cho, Yong Jun;Kim, Gweon Soo
    • Journal of The Korean Society of Civil Engineers
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    • v.28 no.5B
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    • pp.559-573
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    • 2008
  • In this study, we newly proposed 3-D nonlinear wave driver utilizing the Navier-Stokes Eq. the numerical integration of which is carried out using SPH (Smoothed Particle Hydrodynamics), an internal wave generation with the source function of Gaussian distribution and an energy absorbing layer. For the verification of new 3-D nonlinear wave driver, we numerically simulate the sloshing problem within a parabolic water basin triggered by a Gaussian hump and uniformly inclined water surface by Thacker (1981). It turns out that the qualitative behavior of sloshing caused by relaxing the external force which makes a free surface convex or uniformly inclined is successfully simulated even though phase error is visible and an inundation height shrinks as numerical simulation more proceeds. For the more severe test, we also simulate the nonlinear shoaling and refraction over uniform beach of wedge shape. It is shown that numerically simulated waves are less refracted than the linear counterpart by Hamiltonian ray theory due to nonlinearity, energy dissipation at the bottom and side walls, energy loss induced by breaking, and the hydraulic jump occurring when breaking waves encounter a down-rush by the preceding wave.

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Physicochemical, Microbial, Rheological, and Sensory Properties of Yogurt Added with Yuza Pectin Extract (유자펙틴 추출물을 첨가한 요구르트의 이화학적, 미생물학적, 유변학적 및 관능적 품질 특성)

  • Yoon, Mi-Ra;Seo, Jeong-Yun;Ryu, Ga-Eun;Kim, Yeon-Ho;Seo, Moon-Cho;Chang, Yoon Hyuk
    • Journal of the Korean Society of Food Science and Nutrition
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    • v.45 no.4
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    • pp.562-568
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    • 2016
  • This study investigated the effects of Yuza pectin extract (0, 0.1, 0.15, and 0.2%, w/v) on the physicochemical, microbial, rheological, and sensory properties of yogurt. Pectin extract was extracted from Yuza peel by using citrate after juicing the flesh. The total sugar content of Yuza pectin was 89.07%. The pH of Yuza pectin extract-added yogurt was 4.43. All Yuza pectin extract-added yogurt samples showed shear-thinning flow behaviors (n=0.33~0.44). The values for apparent viscosity ($0.34{\sim}0.47Pa{\cdot}s$), consistency index ($4.48{\sim}10.25Pa{\cdot}s^n$), yield stress (6.56~17.61 Pa), storage modulus (47.96~75.21 Pa), and loss modulus (19.79~26.06 Pa) for 0.1~0.2% (w/v) Yuza pectin extract-added yogurt were considerably higher than those of the control. These result indicated that Yuza pectin extract could enhance steady and dynamic shear rheological properties of yogurt. The sensory scores of Yuza pectin extract-added yogurt were higher than those of the control.