• Title/Summary/Keyword: Oil flow

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Experimental Study on the Calculation of Stremlines Around a ShipHull of Chine Form (Chine형 선체주위의 유선계산에 관한 실험적 고찰)

  • 이근무
    • Journal of the Korean Society of Fisheries and Ocean Technology
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    • v.32 no.3
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    • pp.273-285
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    • 1996
  • Generally, the flow around the ship's hull often appear 3-dimensional separation at the bow and stem, and the vortex by this flow affects greatly the resistance propulsive efficiency and maneuverability of the ship. This study is compared the calculated result based on the streamlines calculation method with the experimental result by oil fIlm method to analyze the patterns and characteristics of the flows around the ship's hull of chine form. DTMB Series 62, 4667-1 vessel was selected as a sample ship of chine form and model ship was painted with the mixture of oil-color, paint, and poly wax at the surface of the vessel and tested in the model towing tank of Inha University. The results obtained in this study are listed briefly as follows ; 1. For the single chine form, after $4\frac{1}{2}$ station the streamlines are crossed at the chine line and the streamlines are converted to the vortex follow the chine line. 2. For the single chine form, the vortex appered increases and severely in and arround the stern. 3. The approximate streamlines for the ship's hull of chine form can be assigned by the use of the Watanabe's basic transformation formular.

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Characterization of gas-water flow in tight sandstone based on authentic sandstone micro-model

  • Liu, Yuqiao;Lyu, Qiqi;Luo, Shunshe
    • Geosystem Engineering
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    • v.21 no.6
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    • pp.318-325
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    • 2018
  • Eight tight sandstone reservoir samples from $He_8$ and $Shan_1$ Formations of the Sulige Gas field were selected to perform gas-water micro-displacement experiment based on authentic sandstone micro-model. The gas pressure-relief experiment was proposed for the first time to simulate the pressure change and gas-water percolation characteristics in the process of gas exploitation. The experiment results show that: (1) In the process of gas accumulation, the gas preferentially flows into the well-connected pores and throats with large radius, but rarely flows into the area without pores and throats. (2) Under sufficient gas drive, the water in pores and throats usually exists in the forms of 'thin water film', 'thick water film', and 'water column', but under insufficient gas drive, gas fails to flow into new pathways in time, so that the reservoirs with large pores and throats are high in water cut. (3) Under the same water saturation, the reservoirs with better petrophysical properties has higher gas recovery factor within unit time. Under the same petrophysical conditions, the reservoirs with lower water saturation show higher gas recovery factor within unit time. The higher the permeability, the stronger the liquid carrying capacity of reservoirs.

A Study on the Separation Efficiency of In-line Type Subsea Oil-water Separator (In-line형 심해 유수분리기의 분리 효율에 관한 연구)

  • Kim, Hyun-Ji;Kim, Gwi-Nam;Kim, Young-Ju;Woo, Nam-Sub;Huh, Sun-Chul
    • Journal of the Korean Society of Industry Convergence
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    • v.24 no.3
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    • pp.253-260
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    • 2021
  • The implementation of subsea separation and liquid boosting is becoming a common development scheme for the exploration of deep water fields. Subsea separation is an attractive and economic solution to develop deep offshore fields producing fluid without hydrate or wax. A subsea separator can avoid or simplifying costly surface platforms of floating vessels, as well as being an efficient tool to enhance hydrocarbon production. Subsea separation system should be reliable to ensure successful operation in a wide range of 3-phase flow regime. In this study, multiphase flow characteristics inside in-line type subsea separation system are investigated for the design of subsea separation system.

Casting Layout Design Using CAE Simulation : Automotive Part(Oil Pan_BR2E) (CAE을 이용한 주조방안설계 : 자동차용 부품(오일팬_BR2E))

  • Kwon, Hong-kyu
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.40 no.1
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    • pp.35-40
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    • 2017
  • A most important progress in civilization was the introduction of mass production. One of main methods for mass production is die-casting molds. Due to the high velocity of the liquid metal, aluminum die-casting is so complex where flow momentum is critical matter in the mold filling process. Actually in complex parts, it is almost impossible to calculate the exact mold filling performance with using experimental knowledge. To manufacture the lightweight automobile bodies, aluminum die-castings play a definitive role in the automotive part industry. Due to this condition in the design procedure, the simulation is becoming more important. Simulation can make a casting system optimal and also elevate the casting quality with less experiment. The most advantage of using simulation programs is the time and cost saving of the casting layout design. For a die casting mold, generally, the casting layout design should be considered based on the relation among injection system, casting condition, gate system, and cooling system. Also, the extent or the location of product defects was differentiated according to the various relations of the above conditions. In this research, in order to optimize the casting layout design of an automotive Oil Pan_BR2E, Computer Aided Engineering (CAE) simulation was performed with three layout designs by using the simulation software (AnyCasting). The simulation results were analyzed and compared carefully in order to apply them into the production die-casting mold. During the filling process with three models, internal porosities caused by air entrapments were predicted and also compared with the modification of the gate system and overflows. With the solidification analysis, internal porosities occurring during the solidification process were predicted and also compared with the modified gate system.

Biodegradation of Diesel Oil by Microorganisms Isolated from Petroleum Contaminated Site (유류 오염지역으로부터 분리된 균주를 이용만 디젤유의 분해)

  • 박천보;허병기;윤현식
    • KSBB Journal
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    • v.16 no.6
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    • pp.632-637
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    • 2001
  • The cells obtained from diesel contaminated site were tested for diesel degradation by culturing them on the culture medium that contained diesel as the only carbon source. Two strains that grew well in the culture media were separated: one formed white colony and another strain formed yellow colony. When they were cultured together, much higher diesel degradation was obtained compares to that of individual cell culture. Mixed culture of white and yellow colony forming strains grew well with 1%(v/v) diesel and the addition of growth nutrients increased the diesel degradation. Additional nitrogen source was efficient for higher diesel degradation (over 90%) when it was compared with that without nitrogen source. When mixed culture of white and yellow colony forming cells were applied to the soil column system contaminated by diesel, 30 mL/min of air flow rate was found to be sufficient to degrade diesel oil. The diesel degradation did not increase noticeably at higher flow rate. The addition of nitrogen source resulted in the increase in diesel degradability.

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Comparison of Venting Modes for Bench Scale Treatment of Diesel Contaminated Soil (디젤오염토양의 Bench Scale 처리에 있어서 벤팅모드 비교)

  • Kim, Young-Am;Lee, Yong-Hee;Lee, Dong-Sun;Suh, Myung-Gyo
    • Journal of Environmental Health Sciences
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    • v.32 no.5 s.92
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    • pp.499-505
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    • 2006
  • Bioventing efficiency was compared in a continuous and an intermittent(6hr injection and 6hr rest) air injection mode. Two lab-scale columns which packed with 5 kg of soil artificially contaminated by diesel oil were operated. The columns were maintained at the $25^{\circ}C{\pm}2.5$ in order to minimize the effect of exterior temperature variation. The flow rate of air injection mode were maintained constantly at the flow rate of 10 ml/min. The moisture of the columns was stably maintained at $60{\sim}80%$ of field capacity. The nutrient compounds were added to make C:N:P ratio as 100:10:l. The continuous and intermittent injection modes showed 67.56% and 69.63% reduction of initial TPH concentration during 90 days, respectively. Two venting modes showed similar results in the analysis of the trends of the hydrocarbon utilizing bacterial counts for operating periods. The carbon dioxide production rate of the continuous injection mode was higher than that of intermittent injection mode. The loss of diesel oil by volatilization in the continuous and intermittent injection modes were about 5% and 1%, respectively. The lower volatilization loss in the intermittent injection mode suggested that the biodegradation of TPH in the intermittent injection mode was greater than that of the continuous mode. These results suggested that the intermittent injection mode is more efficient than the continuous venting mode.

A Study of the Variation in Intensifier Performance Characteristics Varying with Pressure and Temperature (압력·온도 변화에 따른 초고압 발생기 성능특성 연구)

  • Kim, Hyoung-Eui;Lee, Gi-Chun;Kim, Jae-Hoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.9
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    • pp.1249-1255
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    • 2010
  • An ultra high- pressure system generally consists of a hydraulic power unit, an oil supply unit, an electrical power supply device, and an electrical control device. The hydraulic power unit supplies the hydraulic power to the intensifier to create generate ultra high pressure. The intensifier amplifies increases the pressure using the oil supplied from by the hydraulic power unit. The electrical supply devices and control devices maintain are provided for the electric motors, valves, and sensors. In this study, instead of a flow-control device, a pressure-control type device was mounted on a manifold block in the hydraulic power unit instead of the flow-control type. A servo valve was fitted in the intensifier, and the performance characteristics of the intensifier varied according to the variations of in the pressure cycle and with the temperature of the operating oil in the hydraulic power unit.

Development of an Automated Integrated Design System for Gerotor Pumps with Multiple Profiles(Ellipse and Involute) (타원.인벌루트 조합 형상을 갖는 지로터 펌프의 통합적 설계 자동화 시스템 개발)

  • Moon, Hyun-Ki;Jung, Sung-Yuen;Bae, Jun-Ho;Chang, Young-June;Kim, Chul
    • Journal of the Korean Society for Precision Engineering
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    • v.27 no.9
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    • pp.67-77
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    • 2010
  • An internal lobe pump is suitable for oil hydraulics of machine tools, automotive engines, compressors, constructions and other various applications. In particular, the pump is an essential machine element of an automotive engine to feed lubricant oil. The subject of this paper is the theoretical analysis of internal lobe pump whose the main components are the rotors: usually the outer one is characterized by lobe with elliptical and involute shapes, while the inner rotor profile is determined as conjugate to the other. And the integrated design system which is composed of three main modules has been developed through AutoLISP under AutoCAD circumstance plus CFD-ACE+. It generates new lobe profile and calculates automatically the flow rate and flow rate irregularity according to the lobe profile generated. CFD simulation results show trends similar to those carried out in experiments, and a quantitative comparison is presented. Results obtained from the automotive integrated design system enable the designer and manufacturer of oil pump to be more efficient in this field.

Autogenous Shrinkage and Fundamental Properties of the High Strength Mortar Containing Waste Vegetable Oil (폐식용유를 사용한 고강도 모르터의 자기수축 및 공학적 특성)

  • Han, Min-Cheol;Song, Ri-Fan
    • Journal of the Korean Recycled Construction Resources Institute
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    • v.5 no.1
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    • pp.97-102
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    • 2010
  • The objective of this paper is to explore the possibility of reuse of waste vegetable oil (WO) as an autogenous shrinkage reducer for high strength concrete and to compare the amount of autogenous shrinkage of the mortar using existing shrinkage reducing agent(SR) and expansive additives(EA). According to test results, as the dosages of WO increased, flow value exhibited to decrease, while the use of SR increased flow value. For the effect of WO on strength, although the use of SR and WO resulted in a slight decrease in compressive strength at early age, at 91 days they had similar strength level of the plain mixture. For autogenous shrinkage, as expected, the addition of WO, SR and EA resulted in a decrease of autogeneous shrinkage considerably especially, WO had superiority in autogenous shrinkage reducing effect compared with the case of SR and EA.

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Analysis of Effect of Surface Modified Silica Nanofluid Injection on Carbonate Rock (탄산염암 내 표면개질된 실리카 나노유체 주입 효과 분석)

  • Jang, Hochang
    • Journal of the Korean Institute of Gas
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    • v.26 no.2
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    • pp.1-8
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    • 2022
  • The purpose of this study is to prepare GPTMS((3-Glycidoxypropyl) trimethoxysilane)-SiO2 nanofluid and analyze the effect of nanofluid injection on carbonate reservoirs. Structural analysis of silica nanoparticles modified by GPTMS was investigated by FTIR(Fourier transform infrared spectroscopy). C-H stretching vibrations at 2,950 cm-1 indicating the silica surface modification with GPTMS were observed when the silane feed was over 0.5 mmol/g. Also, the coreflooding test by nanofluid injection on the aged limestone and dolomite plug samples was carried out with different particle concentration and flow rate. The incremental oil recovery was up to 18.9%, and contact angle and permeability of carbonate samples were changed by the effect of nanoparticle adsorption on pore which caused wettability alteration and pore size change. Therefore, the prepared nanofluid will be utilized as an injection fluid for enhancing oil recovery and modifying fluid flow properties such as change of rock wettability and permeability in carbonate reservoirs.