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  • Title/Summary/Keyword: Cylindrical Tank

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Characteristics of sloshing load and flow inside a tank with cylinder structures (실린더 구조물을 설치한 탱크 내부의 슬로싱 하중과 유동 특성)

  • Ki Jong Kim;Hyun-Duk Seo;Daegyoum Kim
    • Journal of the Korean Society of Visualization
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    • v.21 no.1
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    • pp.31-39
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    • 2023
  • Sloshing of the fluid having a free surface produces an impact force on a tank wall subjected to external excitation. This paper investigates the effect of cylindrical structures in a rectangular sloshing tank under translational harmonic excitations. By varying the number of installed cylinders in the tank, the characteristics of the free-surface deformation is experimentally observed, and the peak pressure on the tank wall is extracted by threshold values. To predict the peak pressure, the numerical simulation is also conducted using smoothed particle hydrodynamics (SPH), and the peak values are compared with the experimental results. Furthermore, pressure and velocity fields in the tank and free-surface shape are analyzed at the moment of impact.

An Experimental Study on Heat Storage and Heat Recovery Characteristics of a Latent Heat Storage Tank with Horizontal Shell and Tube Type (수평식 셸-튜브형 잠열축열조의 축열 및 방열특성에 관한 실험적 연구)

  • Kwon, Young-Man;Seo, Hye-Sung;Moh, Jung-Ha
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.24 no.1
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    • pp.50-59
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    • 2000
  • An experimental study has been carried out in order to investigate the heat storage characteristics for a latent heat storage tank with horizontal shell and tube type. The heat exchanger consisted of horizontal cylindrical capsules with a staggered tube bank layout. Based on the obtained data, the effects of flow rate and inlet fluid temperature on the melting time and heat storage rates were examined. It is found that the melting time decreased with increase of the flow rate and the inlet temperature. Results also show that at the initial stage of heat transfer the heat storage rate represents the maximum value and rapidly decreases.

Comparison of elastic buckling loads for liquid storage tanks

  • Mirfakhraei, P.;Redekop, D.
    • Steel and Composite Structures
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    • v.2 no.3
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    • pp.161-170
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    • 2002
  • The problem of the elastic buckling of a cylindrical liquid-storage tank subject to horizontal earthquake loading is considered. An equivalent static loading is used to represent the dynamic effect. A theoretical solution based on the nonlinear Fl¨ugge shell equations is developed, and numerical results are found using the new differential quadrature method. A second solution is obtained using the finite element package ADINA. A major motivation of the study was to show that the new method can serve to verify finite element solutions for cylindrical shell buckling problems. For this purpose the paper concludes with a comparison of buckling results for a number of cases covering a wide range in tank geometry.

Measurement of Acoustic Radiation Efficiency of the Submerged Circular Cylindrical Structure in Water Tank (수조에서의 원통형 구조물 음향방사효율 측정에 관한 연구)

  • Han, Seungjin;Kang, Myunghwan;Lee, Jongju
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.25 no.11
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    • pp.747-752
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    • 2015
  • Underwater radiated noise is an important characteristic in the naval weapon systems. It is difficult to measure the radiation efficiency of underwater vehicle, such as UUV(unmanned underwater vehicle) and underwater weapons in real operation environment. In this study, acoustic radiation efficiency of a circular cylindrical structure is measured in the laboratory-water tank. The radiation efficiency is compared with the numerical results and it is found that they are in a good agreement. Therefore, the measurement method can be applied effectively for predicting the underwater radiation noise and effectiveness of radiation reduction means.

Wind pressure and buckling of grouped steel tanks

  • Portela, Genock;Godoy, Luis A.
    • Wind and Structures
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    • v.10 no.1
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    • pp.23-44
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    • 2007
  • Wind tunnel experiments on small scale groups of tanks are reported in the paper, with the aim of evaluating the pressure patterns due to group effects. A real tank configuration is studied in detail because one tank buckled during a hurricane category 3. Three configurations are studied in a wind tunnel, two with several tanks and different wind directions, and a third one with just one blocking tank. The pressures were measured in the cylindrical part and in the roof of the tank, in order to obtain pressure coefficients. Next, computational buckling analyses were carried out for the three configurations to evaluate the buckling pressure of the target structure. Finally, imperfection-sensitivity was investigated for one of the configurations, and moderate sensitivity was found, with reductions in the maximum load of the order of 25%. The results help to explain the buckling of the tank for the levels of wind experienced during the hurricane.

A Study on Vibration Characteristics with Sloshing Mode Effect in Water Tank Structure (유체 슬로싱모드가 탱크의 진동에 미치는 영향에 대한 연구)

  • Bae, Sung-Yong
    • Journal of the Society of Naval Architects of Korea
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    • v.40 no.6
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    • pp.88-95
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    • 2003
  • Liquid storage rectangular tank structures are used in many fields of airplane and marine engineering. Fatigue damages are sometimes observed in these tanks which seem to be caused by resonance. Therefore it is essentially important to estimate vibration characteristics of tank structures. Many Investigators studied the vibration of cylindrical and rectangular tank structures containing still fluid. In general, the eigenbehavior of interior liquid is characterized by the sloshing mode while that of the structure by the bulging mode. However, the structure deformation to the sloshing mode and the liquid free-surface fluctuation to the bulging mode have been neglected in the classical added-mass computation. in the present paper, we study the vibration characteristics with sloshing mode effect.

Measurement of Real Deformation Behavior in C-type Lng Mock-up Tank using Strain Gage (스트레인 게이지를 이용한 C-type LNG Mock-up 탱크 내조 실 변형 거동 측정)

  • Jung, Won-Do;Kim, Tae-Wook;Kim, Jeong-Hyeon;Lee, Do-Young;Chun, Min-Sung;Lee, Jae-Myung
    • Journal of Ocean Engineering and Technology
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    • v.30 no.2
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    • pp.117-124
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    • 2016
  • A C-type LNG mock-up tank was constructed to evaluate the durability of the tank and its structural safety. An experimental strain analysis system equipped with strain gages was designed to investigate the structural behavior of the inner tank at a high hydraulic pressure. In addition, the insulation used in the space between the inner tank and outer tank had a compressive strength and the inner tank thickness of the cylindrical shell and hemisphere was 4.0 mm, which was designed to be thinner than the existing rules. The strains on the inner tank were measured with increasing pressure, and these measurements were compared and analyzed at the strain gage attachment points.

Shielding effects and buckling of steel tanks in tandem arrays under wind pressures

  • Portela, Genock;Godoy, Luis A.
    • Wind and Structures
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    • v.8 no.5
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    • pp.325-342
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    • 2005
  • This paper deals with the buckling behavior of thin-walled aboveground tanks under wind load. In order to do that, the wind pressures are obtained by means of wind-tunnel experiments, while the structural non linear response is computed by means of a finite element discretization of the tank. Wind-tunnel models were constructed and tested to evaluate group effects in tandem configurations, i.e. one or two tanks shielding an instrumented tank. Pressures on the roof and on the cylindrical part were measured by pressure taps. The geometry of the target tank is similar in relative dimensions to typical tanks found in oil storage facilities, and several group configurations were tested with blocking tanks of different sizes and different separation between the target tank and those blocking it. The experimental results show changes in the pressure distributions around the circumference of the tank for half diameter spacing, with respect to an isolated tank with similar dimensions. Moreover, when the front tank of the tandem array has a height smaller than the target tank, increments in the windward pressures were measured. From the computational analysis, it seems that the additional stiffness provided by the roof prevents reductions in the buckling load for cases even when increments in pressures develop in the top region of the cylinder.

A study on the development of oil skimming ship for large quantity of oil pollution (대형 오염방제 선박의 개발에 관한 연구)

  • 권기생
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.2 no.1
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    • pp.57-65
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    • 1996
  • The latest date, No. 1 YouII was grounded and sunk into the sea at MAMHYUNGJEDO ( South brother Island) in Sep. 21. 1995, and M.V. Sea Prince of V.L.C.C also made a big oil poullution accident owing to Typhoon "Paei" at front sea of Yeu Choun on Jul. 25. 1995. The large or small scall scale of oil poullution accident frequently was occurred about 300-350 cases per ine(1) year. The countries advanced in marine relations like as, nited Kingdom and Japan, have perfect system The country of expert education, training and oil recovery equipments in oil poullution accidents. The large quantity oil skimming ship's basic condition need general skimming ship which was high speed and large quantity skimming ability , and hve to store the recovered oil into tanks This oil skimming shop are composit the skimmer whuch move up and down according to the wace movements, storage tank which storage the recovered oil in after side, transfer pump which transformed from flooding tank to separating tank and separating tank which separated the oil mixtures, Also there are cylindrical floated which keep the auto positing, gate which keep the auto positing, gate which protect and guide the recovering oil from sea and balance weight for skimmer balance. Also there are cylindrical floated which keep the auto positing, gate which protect and guide the recovering oil from sea and balance weight for skimmer balance. The important arrangement is twin arm which moved by two hinge and move te skimming unit by wave movement. In gate of inside, made long wear in the gate bellow position, there are also connected the flexible hose for oil mixtures drop. The separating tank composited with multi-divided bulkhead for ffective oil and sea water separating by settling and flotation principle. As use the above natural princile and equipment, we can remove the large quantity oil by developed oil skimming ship.ming ship.

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