• Title/Summary/Keyword: freezing analysis model

검색결과 85건 처리시간 0.025초

김치 동결시의 물리적 특성 및 동결시간 예측 모델 개발 (Development of Freezing Time Prediction Model and Thermo-physical Properties of Frozen Kimchi)

  • 정진웅;김병삼;김종훈
    • 한국식품저장유통학회지
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    • 제10권2호
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    • pp.125-130
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    • 2003
  • 본 연구에서는 냉동처리한 김치의 동결에 따른 물리적 특성을 조사하고 적정 동결시간을 예측하기 위한 모델을 개발하였다. 김치의 동결 전후의 밀도를 부피에 대한 중량의 비로 산정한 결과 김치의 밀도는 1001.9$\pm$0.03 kg/㎥(동결전), 987.0$\pm$0.07 kg/㎥(동결후)이었고 김치의 체적팽창은 4.67%(-15$^{\circ}C$)이었다. 김치의 빙결점은 양념액에서 -2.5$^{\circ}C$, 고형분은 -4.$0^{\circ}C$로 측정되었다. 김치의 빙결율은 -5.$0^{\circ}C$일 때 약 50%이상, -1$0^{\circ}C$일 때 약 75% 이상, -$25^{\circ}C$일 때 약 90% 수준이었다 시료의 초기온도( $X_1$), 시료의 두께( $X_2$)와 시료의 초기빙결점에서 동결매체 온도사이의 차의 역수( $X_3$) 및 표면열전달계수의 역수( $X_4$)를 독립변수로 하고 동결시간(Y)을 종속변수로 설정하여 다중회귀 분석을 실시한 결과, $Y_{kimchi}$=3.856 $X_1$+13982.8 $X_2$+8305.166 $X_3$+ 3559.181 $X_4$-639.189($R^2$=0.9632)의 방정식을 구하였다. 이 식은 기존의 모델에 비해 측정치와 예측치가 비교적 유사한 것으로 나타났으며, 평균 절도오차도 10% 수준이었다.

Modeling and Analyzing Per-flow Throughput in IEEE 802.11 Multi-hop Ad Hoc Networks

  • Lei, Lei;Zhao, Xinru;Cai, Shengsuo;Song, Xiaoqin;Zhang, Ting
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • 제10권10호
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    • pp.4825-4847
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    • 2016
  • In this paper, we focus on the per-flow throughput analysis of IEEE 802.11 multi-hop ad hoc networks. The importance of an accurate saturation throughput model lies in establishing the theoretical foundation for effective protocol performance improvements. We argue that the challenge in modeling the per-flow throughput in IEEE 802.11 multi-hop ad hoc networks lies in the analysis of the freezing process and probability of collisions. We first classify collisions occurring in the whole transmission process into instantaneous collisions and persistent collisions. Then we present a four-dimensional Markov chain model based on the notion of the fixed length channel slot to model the Binary Exponential Backoff (BEB) algorithm performed by a tagged node. We further adopt a continuous time Markov model to analyze the freezing process. Through an iterative way, we derive the per-flow throughput of the network. Finally, we validate the accuracy of our model by comparing the analytical results with that obtained by simulations.

배관의 결빙에 의한 열변형 및 열응력 해석 (Thermal deformation and thermal stress analysis of pipe during pipe internal fluid freezing)

  • 박영돈;변상규;강범수
    • 대한기계학회논문집A
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    • 제22권1호
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    • pp.227-237
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    • 1998
  • In case the systems have radioactivity, toxic liquid or expensive fluid, and have to be performed repair work at one point of the system pipe, the formation of an internal ice plug by the removal of heat from the pipe is often consideredas a useful method. In this procedure, an annular jacket is placed around the pipe, and the jacket is then filled with liquid Nitrogen(-196.deg. C). Thermal analysis by the finite element method based on the laboratory experiments has been constructed. The result of the finite element analysis on the experimental model shows to be reasonable, and thus the finite element analysis for different pipe size, material and thickness has been performed to see if the ice plugging procedure in various applications can be safely performed without possibility of damage to the pipe. It has been confirmed that in carbon steel pipes the maximum stress is found around the boundary of the freezing jacket, and the stress increases as pipe thickness increases, but the maximum stress shows no consistency along the increment of the pipe diameter. The maximum stresses appear lower than yield stress in carbon steel. It has been also shown that in stainless steel pipes the maximum stresses are also found around the boundary of the freezing jacket, but almost the same value in spite of different pipe size an thickness, and the maximum stresses show slightly higher than the yield stress of the stainless steel.

연소시 발생하는 파면의 나노 사이즈 두께 측정: 수치적 접근 (Measuring Nano-Width of Wave Fronts in Combustion: a Numerical Approach)

  • 여재익
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2005년도 제31회 KOSCO SYMPOSIUM 논문집
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    • pp.20-27
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    • 2005
  • I consider the structure of steady wave system which is admitted by the continuum equations for materials that undergo phase transformations with exothermic chemical reaction. In particular, the dynamic phase front structures between liquid and gas phases, and solid and liquid phases are computationally investigated. Based on the one-dimensional continuum shock structure analysis, the present approach can estimate the nano-width of waves that are present in combustion. For illustration purpose, n-heptane is used in the evaporation and condensation analysis and HMX is used in the melting and freezing analysis of energetic materials of interest. On-going effort includes extension of this idea to include broad range of liquid and solid fuels, such as rocket propellants.

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Thermal stress analysis around a cavity on a bimetal

  • Baytak, Tugba;Bulut, Osman
    • Structural Engineering and Mechanics
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    • 제69권1호
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    • pp.69-75
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    • 2019
  • The plates made of two materials joined to each other having the different coefficient of thermal expansions are frequently encountered in the industrial applications. The stress analysis of these members under the effect of high-temperature variation has great importance in design. In this study, the stress analysis of the experimental model developed for the problem considered here was performed by the method of photothermoelasticity. The thermal strains were formed by the mechanical way and these were fixed by the strain freezing method. For the stress measurements, the method of slicing is applied which provides three-dimensional stress analysis. The analytical solution in the literature was compared with the related stress distribution obtained from the model. Moreover, the axisymmetric finite element model developed for the problem was solved by ABAQUS and the results obtained here compared with those of the experimental model and the analytical solution. As a result of this study, this experimental method and numerical model can be used for these type of thermal stress problems which have not been comprehensively analyzed yet.

이중보온 열수송관에 대한 동결차수공법개발에 관한 연구 (The study of developing the freezing seal isolation method for the pre insulated heat transfer pipe)

  • 유병희;안창구;김우철;신익호
    • 에너지공학
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    • 제26권3호
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    • pp.105-112
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    • 2017
  • 우리는 원자력발전시스템에서부터 상수도까지 많은 배관시스템을 사용하고 있다. 그리고 이들 배관시스템의 적절한 운용을 위하여 배관시스템의 유지 및 보수 등을 수행하고 있다. 특히 한국지역난방공사와 같은 대형플랜트 배관시스템의 고장은 기업의 생산성과 이익에 직결된 문제일 뿐만 아니라 국민의 안전과 편익과 같은 매우 중요한 문제를 유발할 수 있기 때문에 빠른 대응과 안전한 수리가 가장 중요한 문제로 대두되고 있다. 본 연구에서는 한국지역난방공사 사용 중인 이중보온 열수송관(300A)의 유지보수를 위하여 액화질소를 이용한 배관 동결차수공법을 개발하였다. 본 연구에서는 전산해석기법을 채용하여 대상 열수송관과 전용 재킷에 대한 내부 유동 및 열전달 해석을 수행하여 최적의 시스템을 선정하고, 상세 모델을 설계, 제작하였다. 실험실 규모 시험장치를 개발하여 차수공법에 대한 자체시험을 수행하고, 한국지역난방공사 세종지사 Test bed에서 현장적용 성능평가 시험을 수행하였다.

어선용 수평 냉각판 냉동장치의 냉동 효율 개선에 관한 연구 (A Study on Freezing Efficiency Improvement of Horizontal-Plate Freezer for Fishing Vessel)

  • 이재철;정지호;김병목;신성철;김수영;정보용
    • 대한조선학회논문집
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    • 제52권1호
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    • pp.19-24
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    • 2015
  • The economic efficiency for fishery products can be related to their freshness and the quality. In order to freshly storage the product, freezing equipment system is necessary for fishing vessels. For this purpose, the horizontal plate freezer (HPF) is mostly used. In this research, our major objective is to improve the freezing performance of the HPF. Therefore, it is important to analyse the relationship between the shape of channels and the cooling temperature of the HPF. In order to save calculation time while checking the trend analysis between shape and performance, we used scaled models, and evaluate the cooling temperature of full scale model based on trend analysis results. The produced HPF in domestic was used, and the same operating conditions are considered. Based on this paper, the future research will be a comparison and verification through the experiments.

빙해수조 공냉 시스템 변화에 따른 결빙 균질도 비교 전산해석 (Computational Analysis for Effects of Cooling System on Homogeneity of Ice Thickness and Temperature on Water Surface)

  • 이승수;김영민;이춘주
    • 대한조선학회논문집
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    • 제50권3호
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    • pp.167-174
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    • 2013
  • Model ice forming process in ice tank needs several steps of seeding, freezing, tempering. In those process, one of the most important factors to affect the accuracy of experiment is the homogeneity of the ice thickness and the temperature. This paper investigated a computational and statistical method to assess the uniformity of the model ice. In addition, the different configurations of freezing systems were considered to improve the uniformity. Qualitative assessment using streamlines from the cooling units was carried out by computational fluid dynamics (CFD) and the quantitative evaluations of the homogeneity were compared using the temperature distribution on the ice surface. In addition, multi species transport analysis is introduced to understand the circulation efficiency of cold air from the cooling units. As the results, optimized configurations were determined by adjusting the angles of vane in the cooling units.

빙해선박 상부갑판 열선의 열전달 특성에 따른 착빙방지 성능평가 및 설계기준에 관한연구 (A Study on the Anti-Icing Performance Evaluating and Design Guide by Heating Coil for Upper Deck of Icebreaking Vessels)

  • 이종찬;서영교;이춘주
    • 대한조선학회논문집
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    • 제49권6호
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    • pp.541-549
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    • 2012
  • The study adopted a freezing prevention method of the upper deck which used heating coil, and carried out numerical analysis by using ANSYS 13.0 CFD for design guide of the vessel operating in cold region. It is based on the experimental results of the anti-icing performance tests which were carried at cold room chamber in MOERI. Numerical analysis for the design guide was performed by considering S.S.T. (Shear Stress Transport) turbulent model for flow separation effects and the turbulence which occurred in interfaces of the numerical model in order to express appropriate heat transmission phenomenon. The numerical result shows average temperature of the upper deck surface appeared similarly compared with the indoor chamber test. The design guide for optimum freezing prevention presented through heat transmission capability and interval of the heat coil in various outdoor temperature($10^{\circ}C{\sim}-30^{\circ}C$) and wind speed(1m/s~7m/s).

순수 비틀림 모멘트를 받는 직교 이방성체의 광탄성 시험법 개발에 관한 연구( I )-차원 광탄성 실험법 모델의 절단법과 $G_{i} 와 f_{ij}$ 의 측정법 - (A Study on the Development of Photoelastic Experiment for Orthotropic Material Under Pure Torsional Moment (I) : The Slicing Method Of 3-Dimensional Photoelastic Experiment Model And The Measuring Method of $G_{I} And f_{Ij}$)

  • 황재석;방창일
    • 대한기계학회논문집
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    • 제15권2호
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    • pp.424-435
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    • 1991
  • To develop the photoelastic experiment method for the orthotropic material under pure torsional moment is the main objective of this research. In the development of photoelastic experiment for orthotropic material under pure torsional moment, the important problems and their solutions are the same as following. In the model material for photoelastic experiment, it was found that C.F.E.C.(Copper Fiber Epoxy Composite) can be used as the model material of photoelastic experiment for orthotropic material. In the stress freezing cycle, it was assured that stress freezing cycle for epoxy can be used as the stress freezing cycle of the photoelastic experiment for orthotropic material. In the slicing method, it was found that the negative oblique slicing method can be effectively used as slicing method in 3-dimensional photoelastic experiment. In the measuring method of stress fringe values and physical properties in the high temperature, it was found that stress fringe values can be directly measured by experiment and physical properties can be directly or indirectly by equation between stress fringe values and physical properties developed by author. In the stress analysis method of orthotropic material under pure torsional moment by photoelastic experiment, it will be studied in the second paper.