• 제목/요약/키워드: Single Drop Impact

검색결과 18건 처리시간 0.03초

Recent Progress of Spray-Wall Interaction Research

  • Lee Sang-Yong;Ryu Sung-Uk
    • Journal of Mechanical Science and Technology
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    • 제20권8호
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    • pp.1101-1117
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    • 2006
  • In the present article, recent progress of spray-wall interaction research has been reviewed. Studies on the spray-wall interaction phenomena can be categorized mainly into three groups: experiments on single drop impact and spray (multiple-drop) impingement, and development of comprehensive models. The criteria of wall-impingement regimes (i.e., stick, rebound, spread, splash, boiling induced breakup, breakup, and rebound with breakup) and the post-impingement characteristics (mostly for splash and rebound) are the main subjects of the single-drop impingement studies. Experimental studies on spray-wall impingement phenomena cover examination of the outline shape and internal structure of a spray after the wall impact. Various prediction models for the spray-wall impingement phenomena have been developed based on the experiments on the single drop impact and the spray impingement. In the present article, details on the wall-impingement criteria and post-impingement characteristics of single drops, external and internal structures of the spray after the wall impact, and their prediction models are reviewed.

전기적으로 대전된 액적의 스프레드-스플래시 영역 간 천이조건에 대한 연구 (Investigation of Spread-Splash Transition Criterion of an Electrically Charged Droplet)

  • 류성욱;이상용
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2008년도 추계학술대회B
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    • pp.2995-3000
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    • 2008
  • Understanding of the impinging behavior of an electrically charged spray is essential in determining appropriate operating conditions for electro-spraying of paints, surface coating materials and insecticides. In the present work, the wall impact behavior of an electrically charged drop has been investigated and compared with that of a neutral drop experimentally. The critical Sommerfeld number representing the spread-splash boundary for the charged drop impacting on the dielectric substrate turned out to be larger compared to that for the neutral drop with the same surface condition. The change of the transition boundary is due to the increase in the surface wettability of the drop on the substrate. However, with the electrically conducting substrates, the charging effect on the transition boundary appeared negligible. This is because the electric discharging time is much shorter than the time required for the flattened drop to reach its maximum extent.

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낙하충격실험을 통한 고무의 충격흡수성능과 전단계수 평가 (Determination of Shock Absorption Performance and Shear Modulus of Rubbers by Drop Impact Test)

  • 강동환;서무열;김학인;김태원
    • 대한기계학회논문집A
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    • 제33권4호
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    • pp.321-328
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    • 2009
  • Shock absorption performances of various rubbers were investigated by using drop impact test. Several types of rubber such as NR, NBR, EPDM, SR and PUR with three respective levels of shore hardness were used for the test. As in the cases, the absorbed impact energies in rubbers were measured under seven different loads against impact energy between 5-80J. The impact absorption efficiencies of the rubbers then were evaluated by means of both single impact energy condition and summation of all impact energy applied condition. As shown in the results, PUR and EPDM have better shock absorption performances than other rubbers. Further analysis was extended to determine a shear modulus of SR through the finite element implementation with Blatz-Ko model. As can be seen, relatively higher level of absorption energy results in a decreasing shear modulus.

Response of low-temperature steel beams subjected to single and repeated lateral impacts

  • Truong, Dac Dung;Jung, Hae-Jung;Shin, Hyun Kyoung;Cho, Sang-Rai
    • International Journal of Naval Architecture and Ocean Engineering
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    • 제10권6호
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    • pp.670-682
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    • 2018
  • This paper presents the experimental and numerical investigation results of the response of low-temperature steel (LT-FH32 grade steel) beams under repeated impacts at room temperature and a single impact at a sub-zero temperature. After conducting tensile tests at room and sub-zero, repeated impact tests were conducted on two clamped single-beam models at room temperature, and single-impact tests of two other clamped single-beam models were conducted at $-50^{\circ}C$. The single and repeated impact tests were conducted by releasing a knife-edge striker using a drop testing machine. The permanent deflection of the model measured after each impact gradually increased with increasing number of impacts. Under the reduced temperature, the permanent deflection of the models slightly decreased. The numerical analyses were also performed to predict the damage response of the tested single-beam models. A comparison of the numerical prediction with those of experiments showed quite reasonable agreement.

Parametric study on the structural response of a high burnup spent nuclear fuel rod under drop impact considering post-irradiated fuel conditions

  • Almomani, Belal;Kim, Seyeon;Jang, Dongchan;Lee, Sanghoon
    • Nuclear Engineering and Technology
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    • 제52권5호
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    • pp.1079-1092
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    • 2020
  • A parametric study of several parameters relevant to design safety on the spent nuclear fuel (SNF) rod response under a drop accident is presented. In the view of the complexity of interactions between the independent safety-related parameters, a factorial design of experiment is employed as an efficient method to investigate the main effects and the interactions between them. A detailed single full-length fuel rod is used with consideration of post-irradiated fuel conditions under horizontal and vertical free-drops onto an unyielding surface using finite-element analysis. Critical drop heights and critical g-loads that yield the threshold plastic strain in the cladding are numerically estimated to evaluate the fuel rod structural resistance to impact load. The combinatory effects of four uncertain parameters (pellet-cladding interfacial bonding, material properties, spacer grid stiffness, rod internal pressure) and the interactions between them on the fuel rod response are investigated. The principal finding of this research showed that the effects of above-mentioned parameters on the load-carrying capacity of fuel rod are significantly different. This study could help to prioritize the importance of data in managing and studying the structural integrity of the SNF.

제어봉집합체의 낙하시간과 충격속도 계산을 위한 프로그램 개발 (Development of A Computer Program for Drop Time and Impact Velocity of the Rod Cluster Control Assembly)

  • Park, Ki-Seong;Kim, Il-Kon
    • Nuclear Engineering and Technology
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    • 제26권2호
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    • pp.197-204
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    • 1994
  • 원자로운전정지시 사용되는 제어봉집합체는 제어봉구동장치에서 분리되어 핵연료집합체의 안내관으로 자유낙하한다. 이 제어봉집합체의 주요변수로는 낙하시간과 충격속도가 있는데, 낙하시간은 원자로 안전정지와 관계가 있으며, 충격속도는 핵연료집합체의 건전성과 관계가 있다. 따라서, 제어봉 낙하시간과 충격속도의 적절한 결정은 제어봉집합체와 핵연료집합체의 설계에 매우 중요하다. 제어봉집합체는 낙하도중 유체저항이나 마찰력 및 부력과 같은 여러 힘들에 의해 낙하시간이 감소하게 되는데, 이러한 여러가지 힘의 복잡한 결합으로 인해 낙하시간과 충격속도를 해석적으로 유추하는 것은 매우 어렵다. 본 논문에서는 국산핵연료집합체에 적용되는 해석적인 방정식을 포함하고 있는 프로그램을 개발하였고, 이 프로그램을 단일제어봉 낙하시험과 비교하였다. 비교결과 시험 및 해석결과가 잘일치하고 있음으로써 개발된 프로그램의 검증을 확인할 수 있었고, 따라서 이 프로그램이 제어봉및 안내관의 설계변경시 매우 유용하게 사용할 수 있게 되었다.

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Impact Bending Test Simulations of FH32 High-strength Steel for Arctic Marine Structures

  • Choung, Joonmo;Han, Donghwa;Noh, Myung-Hyun;Lee, Jae-Yik;Shim, Sanghoon
    • Journal of Advanced Research in Ocean Engineering
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    • 제2권1호
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    • pp.28-39
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    • 2016
  • This paper provides theoretical and experimental results to verify the crashworthiness of FH32 high-strength steel for arctic marine structures against ice impact. Assuming that side-shell structures of the Korean arctic research vessel, ARAON, with ice-notation PL10, collide with sheet ice, one-third-scale test specimens with a single transverse frame are manufactured. Impact-bending tests were conducted using a rigid steel striker that mimics sheet ice. Drop height was calculated by considering the speed at which sheet ice is rammed. Prior to impact-bending tests, tensile coupon tests were conducted at various temperatures. The impact-bending tests were carried out using test specimens fully fixed to the inside bottom frame of a cold chamber. The drop-weight velocity and test specimen deformation speed were measured using a high-speed camera and digital image correlation analysis (DICA). Numerical simulations were carried out under the same conditions as the impact-bending tests. The simulation results were in agreement with the test results, and strain rate was a key factor for the accuracy of numerical simulations.

전기적으로 대전된 액적의 스프레드-리바운드 거동 영역에 대한 기초 연구 (Preliminary Investigation on Spread-Rebound Regime of an Electrically Charged Droplet)

  • 류성욱;이상용
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2007년도 춘계학술대회B
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    • pp.2067-2072
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    • 2007
  • Understanding of the impinging behavior of an electrically charged spray is essential in determining appropriate operating conditions for electro-spraying of paints, surface coating materials and insecticides. In the present work, as an initial step, the wall impact of an electrically charged droplet has been experimentally investigated. The charged drops were directed on the surface of a paraffin wax, and the impinging behavior was visualized and recorded using a CCD camera to identify the impingement regime. The spread-rebound boundary for the charged drop turned out to be smaller compared to that for an electrically neutral droplet under the same surface condition. The shift of the transition criterion is considered to be due to the discrepancy between the maximum spread ratio of the electrically charged droplet and that of the neutral droplet.

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횡충격하중을 받는 빙해선박 구조물의 파단에 관한 연구 (On the Fracture of Polar Class Vessel Structures Subjected to Lateral Impact Loads)

  • 민덕기;조상래
    • 대한조선학회논문집
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    • 제49권4호
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    • pp.281-286
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    • 2012
  • Single frame structures with notches were fractured by applying drop impact loadings at room temperature and low temperature. Johnson-Cook shear failure model has been employed to simulate the fractured single frame structures. Through several numerical analyses, material constants for Johnson-Cook shear failure model have been found producing the cracks resulted from experiments. Fracture strain-stress triaxiality curves at both room temperature and low temperature are presented based on the extracted material constants. It is expected that the fracture strain-stress triaxiality curves can offer objective fracture criteria for the assessment of structural fractures of polar class vessel structures fabricated from DH36 steels. The fracture experiments of single frame structures revealed that the structure on low temperature condition fractures at much lower strain than that on room temperature condition despite the same stress states at both temperatures. In conclusion, the material properties on low temperature condition are essential to estimate the fracture characteristics of steel structures operated in the Northern Sea Route.

우적(雨滴)에 의한 토양(土壤) 침식(侵蝕) (Soil Detachment by Single and Multiple Waterdrops)

  • 윌리암 밀러;김계훈
    • Applied Biological Chemistry
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    • 제38권2호
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    • pp.151-156
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    • 1995
  • 하나하나의 우적(雨滴)과 여러개의 우적(雨滴)에 의한 토양의 분리(分離) (detachment)와 휘산(揮散) 침식(侵蝕) (splash erosion)을 연구하고자 미국 조지아주의 대표적인 농경지 토양 다섯 종류를 대상으로 우적탑(雨滴塔) (raindrop tower)과 인공강우기(人工降雨機) (rainfall simulator)를 이용하여 분리(分離) 실험을 수행하였다. 공시토양에 대하여 하나하나의 우적(雨滴)과 여러개의 우적(雨滴)에 의하여 일어나는 분리(分離)는 대부분 모래 크기의 입자로 비선택적이며, 토양의 이화학적 특성의 영향을 거의 받지 않는 경향을 보였다. 본 실험에 이용된 다섯 종류의 토양은 대부분 분산이 잘 되며 비교적 불안정하여 물방울에 의한 분리(分離)가 매우 쉽게 일어났으므로, 이들 토양 interrill 지역에서의 침식(侵蝕)은 분리(分離) 보다는 유출율 (runoff rate)에 의하여 결정됨을 알 수 있었다.

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