• Title/Summary/Keyword: Oil flow

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Research on Air Flow Rate Test Method for Blower System (송풍 시스템의 공기유량측정 방법에 관한 연구)

  • Lee, Jun-Sik
    • Journal of the Korean Society of Industry Convergence
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    • v.25 no.1
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    • pp.55-60
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    • 2022
  • This study conducted the measurements of air flow rate for blower systems with experiment and numerical. A new airflow rate test method is suggested, with which it is possible to accurate measurements and calculate the air flow rate for blower systems. The blower(axial fan) is an industrial fluid machine device that supplies a large amount of air by driving an impeller with an electric motor, and it is widely used throughout the industry such as steel, power plant, chemical, semiconductor, LC D, food, and cement. The airflow from the blower is for exchanging the heat in the cooling unit or heat exchanger. The temperature of coolants and hydraulic oil primarily depends on the amount of airflow rate through the cooling package so its accurate estimation is very important. Moreover, it required a larger investment in time and cost since it could not be executed until the system is actually made. Therefore, this research is intended to examine the phenomenon of air flow pattern when testing air flow rate, suggested new test method, and show the result of the validation test.

A Study on Thermal Performance of Plate Cooler for Cooling Medium Speed Engine Lubricant Oil (선박용 중속엔진 오일냉각용 판형쿨러의 전열성능에 관한 연구)

  • Park, Jae-Hong
    • Journal of the Korean Applied Science and Technology
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    • v.37 no.1
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    • pp.83-90
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    • 2020
  • Plate heat exchangers(PHE) have been commercialized since the 1920s. Since then, although the basic concept of PHEs has changed little, its design and construction have progressed significantly to accommodate higher temperatures, higher pressures, and large heat exchanging capacities. The development trend of PHEs is consistent with heat plate developments with better thermal efficiency, lower pressure drop, and good flow distribution. The purpose of this paper is to introduce the main development processes of a plate cooler for medium-speed engine lubricant oil cooling in vessels which is in line with the development trend of PHEs and to provide its thermal performance data that were found out during experimental tests. The plate cooler in this study cannot measure the wall temperatures directly due to its structural characteristics, so the heat transfer coefficients were calculated using the modified Wilson Plot method. The water-to-water tests were first conducted experimentally to figure out the characteristics of heat transfer coefficients and pressure drops on the water side and then the water-to-oil tests followed to obtain the heat transfer coefficients on the oil side. The test results showed that heat transfer coefficients and pressure drops on both water and oil side increased with flow rates, and it was also found that all the development targets of the plate cooler in this study were achieved successfully.

Extraction of Oil from Canola Seeds with Supercritical Carbon Dioxide (초임계 이산화탄소를 이용한 캐놀라 오일 추출)

  • Hwang, Ah-Reum;Jung, In-Il;Lim, Gio-Bin;Ryu, Jong-Hoon
    • KSBB Journal
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    • v.24 no.4
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    • pp.367-376
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    • 2009
  • In this study, two supercritical extraction systems of different scale, analytical-scale and lab-scale, were employed to investigate the extraction efficiency of canola oil from canola seeds using supercritical carbon dioxide ($SCCO_2$) as an extraction solvent. The effects of various parameters such as extraction temperature ($40{\sim}80^{\circ}C$), pressure (200~500 bar), particle size, and $SCCO_2$ flow direction on the extraction rate and yield were examined in detail. Triglycerides and fatty acids in the extracted canola oil were analyzed quantitatively by high-performance liquid chromatography and gas chromatography. The solubility values of canola oil in $SCCO_2$ could be calculated from the experimental results. Similar extraction yields were obtained from both analytical-scale and lab-scale extraction systems. The extraction rates obtained under solvent ($SCCO_2$ ) upflow conditions were found to be higher than those of solvent downflow extraction. However, the effect of $SCCO_2$ flow direction on the extraction yield was observed to be relatively insignificant.

The Flow Characteristics of ER Fluids According to the Electrode Shape of Two Parallel-Plate (평행평판의 전극형상에 따른 ER 유체의 유동특성 I)

  • Jang, S.C.;Yum, M.O.;Kim, D.T.;Kim, T.H.;Bae, T.Y.
    • Proceedings of the KSME Conference
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    • 2001.06e
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    • pp.207-212
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    • 2001
  • Electro-Rheological(ER) fluid are suspensions which show an abrupt increase in rheological properties under electric fields. ER effects arise from electrostatic forces between the starch particles dispersed in the electrically insulating silicone oil, induced when an electric field is applied. Yield stress of the fluids were measured on the couette cell type rheometer as a function of electric fields. This paper presents performance analyses of four types of the two parallel-plate. Which have different electrode length and width but same electrode area. On the basis of the pressure drop and flow rate analysis. Four types of the two parallel-plate are designed and manufactured. Using ER fluid, it is possible to directly interface between electric signals and fluid power without moving parts.

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Measuring Convective Heat Transfer Coefficient Around a Heated Fine Wire in Cross Flow of Nanofluids (나노유체의 수직유동 속에 놓인 가는 열선주위의 대류열전달계수 측정)

  • Lee, Shin-Pyo
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.32 no.2
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    • pp.117-124
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    • 2008
  • Recent researches on nanofluids have mainly focused on the increase of thermal conductivity of nanofluids under static condition. The ultimate goal of using nanofluids, however, is to enhance the heat transfer performance under fluid flow. So it has been highly necessary to devise a simple and accurate measuring apparatus which effectively compares the heat transfer capability between the base and nanofluids. Though the convective heat transfer coefficient is not the complete index for the heat transfer capability, it might be one of useful indications of heat transfer enhancement. In this article, the working principles of experimental system for convective heat transfer coefficient around a heated fine wire in cross flow of nanofluids and its application example to three samples of nano lubrication oils are explained in detail.

Low Temperature Flow Properties of Palm Biodiesel (팜 바이오디젤의 저온유동성)

  • Jeong, Byung-Hwan;Lee, Kwang-Seok;Kim, Yong-Dai;Shin, Chae-Ho
    • 한국신재생에너지학회:학술대회논문집
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    • 2007.06a
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    • pp.602-605
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    • 2007
  • Soybean and rape seed are common feedstocks for biodiesel product ion in USA and Europe, respectively. On the other hand, South Eastern countries like Malaysia and Indonesia have surplus palm crops. However due to substantial amount of saturated fats in palm, the palm biodiesel has poor low temperature properties. To improve the low temperature flow properties as biodiesel, the dependence of the cold filter plugging point (CFPP) on the fatty acid compositions was examined. Two different kinds of biodiesels, palm and soybean biodiesels, were blended with the different volume ratios. And the low temperature flow properties of 0.5%, 1%, and 5% biodiesel in diesel blend fuels was tested. The decrease of CFPP was not observed for BD1 with Palm BD. Also, WDI test didn't exceed in the range of 4oC by the mixing of Palm BD upto 5% in commercial diesels.

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Design and Performance Test of Plate Type ER-Valve (평판형 ER-Valve의 제작 및 성능실험)

  • 장성철;염만오
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.12 no.6
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    • pp.29-35
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    • 2003
  • In this research 4 plate type ER-Valves which have same surface but different width and length are designed and an experimental apparatus is constructed. With this experimental apparatus, flow rate and pressure drop of ER fluid flowing in ER-valves are measured with varying electric field strength of ER-valve, and relation between valve types and pressure drop is also experimented. ER fluid is made silicon oil mixed with 40wt% starch having hydrous particles. If we allow the same electric field in the ER-Valve, we came to how that the pressure drop is effected by the electrode length and electrode width. When the strength of the electric field increased, the pressure drop happened big and the flow rate decreased.

Numerical Study of Unsteady Mixed Convection in a Cavity with High Viscous Fluid (캐비티 내 고 점성유체의 비정상 흔합대류에 관한 수치해석적 연구)

  • Bae, D.S.;Cai, Long Ji
    • Journal of Power System Engineering
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    • v.13 no.5
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    • pp.11-17
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    • 2009
  • A numerical study of unsteady mixed convection in a cavity with high viscous fluid is presented. Finite volume method was employed for the discretization and PISO algorithm was used for calculating pressure term. The parameters governing the problem are the Rayleigh number ($10^3\;{\leq}\;Ra\;{\leq}\;10^5$), the Reynolds number (0 < Re $\leq$ 1), and the aspect ratio (0.5 $\leq$ AR $\leq$ 2). The fluid used is silicon oil, a high prandtl number fluid, Pr = 909.1. The results show velocity vectors and temperature distributions. It is found that the periodic flows in a cavity are observed at very low Reynolds numbers, and the period of periodic flow decreases with increasing Reynolds and Rayleigh numbers, and increases with increasing aspect ratio. Also, the Reynolds number range of periodic flow increases with increasing Rayleigh numbers and aspect ratio.

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Temperature Rise Prediction of 145kV 40kA Three-phase GIS Bus Bar (145kV 40kA 3상 GIS 모선의 온도상승 예측)

  • Kim, Joong-Kyoung;Lee, Ji-Yeon;Jung, Sang-Yong;Hahn, Sung-Chin
    • Proceedings of the KIEE Conference
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    • 2008.07a
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    • pp.842-843
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    • 2008
  • Many works on the temperature prediction of power apparatus have usually done by coupled magneto-thermal analysis. However, this method can not consider the internal gas or oil flow in the power apparatus. This paper proposes a new coupled magneto-thermal-flow analysis considering Navier-Stokes equations. The convection heat transfer coefficient is calculated analytically and is applied to the boundary condition to the proposed method. Temperature distribution of 145kV 40kA three-phase GIS bus bar model is obtained by coupled magneto-thermal-flow analysis and shows good agreement with the experimental data.

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A Study on the Numerical Analysis of the Viscous Flow for a Full Ship Model (비대선 모형에 대한 점성유동의 수치해석연구)

  • 박명규;강국진
    • Journal of the Korean Institute of Navigation
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    • v.19 no.2
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    • pp.13-22
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    • 1995
  • This paper presents the numerical analysis results of the viscous flow for a full ship model. The mass and momentum conservation equations are used for governing equations, and the flow field is discretized by the Finite-Volume Method for the numerical calculation. An algebraic grid and elliptic grid generation techniques are adopted for generation of the body-fitted coordinates system, which is suitable to ship's hull forms. Time-marching procedure is used to solve the three-dimensional unsteady problem, where the convection terms are approximated by the QUICK scheme and the 2nd-order central differencing scheme is used for other spatial derivatives. A Sub-Grid Scale turbulence model is used to approximate the turbulence, and the wall function is used at the body surface. Pressure and velocity fields are calculated by the simultaneous iteration method. Numerical calculations were accomplished for the Crude Oil Tanker(DWT 95,000tons, Cb=0.805) model. Calculation results are compared to the experimental results and show good agreements.

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