• 한국수산과학회지
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• 제30권2호
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• pp.239-243
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• 1997

포말분리관에서 양어장 순환수를 일정하게 공급하여 분리 실험을 수행하며 체류 시간, 공탑 공기 유속, 포말층 높이 등의 영향에 따른 포말 분리관의 각 성분의 분리 특성을 연구한 결과 체류 시간 및 공탑 공기 유속이 증가할수록 TSS, TA및 $NO_2^-$ 성분의 제거율도 비례적으로 증가하였다. 그리고 포말층의 높이가 증가할수록 TA의 제거율은 월등히 증가한 반면에 $NO_2^-$, TSS의 제거율은 일정하게 유지되었다. 포말분리기의 공탑 공기 유속 및 포말층 높이가 증가할수록 순환수내의 용존산소도 증가하여 포말분리기는 양어장 순환수의 산소 공급 장치로도 활용되었다. 포말분리법은 어류 성장에 유해한 TSS, TA, $NO_2^-$를 단기간에 제거할 수 있고 어류 성장에 필요한 산소를 공급할 수 있는 매우 효과적인 방법으로 판단되었다.

• 한국수산과학회지
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• 제28권5호
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• pp.599-606
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• 1995

포말 분리관에 단백질 용액을 일정하게 공급하여 분리 실험을 수행하며 초기 단백질 농도, 공탑 공기유속, 온도와 pH 등의 영향에 따른 포말 분리관의 단백질 분리특성을 연구한 결과, 액본체 단백질의 약 65% 이상이 약 10min이내에 제거되는 효과적인 분리특성을 나타내어 포말분리법은 양어장 순환수중의 주된 유기성분인 단백질을 분리하기 위한 매우 효과적인 방법이었다. 액본체 중의 단백질의 초기농도가 증가함에 따라 단백질 제거속도는 일정 농도 이하의 조건에서는 직선적으로 증가하다가 일정한 값을 유지하여 단백질 제거속도는 Langmuir 흡착형태를 나타내었으며, 제거속도는 공탑 공기유속에 대해서는 직선 관계를 보였다. 본 실험조건 범위 내에서는 단백질 제거에 있어 온도 및 pH의 영향은 그다지 크지 않는 것으로 나타났으며, 실험결과를 검토한 결과 이론식은 타당하였다

• 설비공학논문집
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• 제13권7호
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• pp.612-620
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• 2001

The optimum design of a heat exchanger with porous media insertion is studied in this paper. It is considered that the aluminum foam metal is inserted in a flat plate channel and air flows through it. The influence of the microstructure of the foam metal on the pressure drop and heat transfer is investigated utilizing previous analytical results and existing correlation equations. Design parameters are identified as the unit-cell size and the ligament thickness of the porous medium, and their effects are examined. The results show that there exists optimum microstructure of the porous media maximizing heat transfer with a constant pressure drop. When the increase in the pressure drop is within a practically acceptable range, the increase in the heat transfer is dominated by the increase in the heat transfer area due to the porous medium insertion. Consequently, among the porous media with a constant pressure drop, the heat transfer is maximized with a microstructure with maximum specific surface area.

• Steel and Composite Structures
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• 제23권1호
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• pp.107-114
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• 2017

Design of stepwise foam claddings subjected to air-blast is performed based on random Voronoialgorithm. FE models are constructed using the random Voronoialgorithm, and numerical analysis is carried out to simulate deformation mode and energy absorption of the cladding by the ABAQUS/Explicit software. The FE model is validated by test result, and good agreement is achieved. The deformation patterns are presented to give an insight into the influences of distribution on deformation mechanisms. The energy absorbed by the stepwise foam cladding is examined, and the parameter effects, including layer number, gradient, and blast loading, are discussed. Results indicate that the energy absorption capacity increases with the number of layer, gradient degree, and blast pressure increasing.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2007년도 정기 학술대회 논문집
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• pp.309-314
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• 2007

Optimal layer sequencing of a multi-layered acoustical foam is solved to maximize its sound transmission loss. A foam consisting of air and poroelastic layers can be optimized when a limited amount of a poroelastic material is allowed. By formulating the sound transmission loss maximization problem as a one dimensional topology optimization problem, optimal layer sequencing and thickness were systematically found for several frequencies. For optimization, the transmission losses of air and poroelastic layers were calculated by the transfer matrix derived from Biot's theory. By interpolating five intrinsic parameters among several poroelastic material parameters, dear air-poroelastic layer distributions were obtained; no filtering or post-processing was necessary. The optimized foam layouts by the proposed method were shown to differ depending on the frequency of interest.

• 한국대기환경학회지
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• 제16권4호
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• pp.381-388
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• 2000

Ceramic foam prepared with cordierite as a starting material by foam method was tested to evaluate the feasibility as a filter for the dust collection in hot gas. Two different types of agents Benzethonium chloride (BZTC, C27H42NO2Cl) and Sodium Lauryl Sulfate(SLS, CH3(CH2)11OSO3Na) were used as foaming agents in foaming process. Porosityof ceramic foam was about 80% and mean pore size were 100${\mu}{\textrm}{m}$ for SLS agent and 200 ${\mu}{\textrm}{m}$ for BZTC. It was observed that ceramic foam was composed of continuous macro-pore structure with opening windows interconnecting macro-pores. The surface of ceramic foam support of was coated with cordierite particles ranged from 20${\mu}{\textrm}{m}$ to 50${\mu}{\textrm}{m}$ Meso-pore size in the coating layer on ceramic foam was below 10${\mu}{\textrm}{m}$. While air permeability of the support increased with increasing macro-pore size coated ceramic filters showed a constant permeability without regard to the macro-pore size of the support. The permeabuilities of support varied in the range of 600$\times$10-13m2 to 1000$\times$10-13m2. For the case of coated ceramic filter it was about 200$\times$10-13m2. As a result of particle trapping test by using fly ash the particle removal efficiency was over the 99.9%.

• 한국마린엔지니어링학회:학술대회논문집
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• 한국마린엔지니어링학회 2005년도 전기학술대회논문집
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• pp.574-579
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• 2005

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2019년도 춘계 학술논문 발표대회
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• pp.168-169
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• 2019

This study examined the effect of foam volume ratio and curing temperature the air dry density and compressive strength of lightweight concrete using bottom ash. Test results showed that the lightweight concrete possessed the compressive strength of 3.4~22.7 MPa at the air dry density of 1,041~1,583 kg/m3.

• 한국연소학회:학술대회논문집
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• 한국연소학회 2007년도 제34회 KOSCO SYMPOSIUM 논문집
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• pp.37-44
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• 2007

A nickel foam, one of metal foams was seleced as a catalyst support instead of conventional ceramic materials. $Al_2O_3$ was coated on the surface of nickel foam to increase the surface area. $Al_2O_3$ coating process was based on sol-gel process. SEM image was obtained and $Al_2O_3$ coverage was confirmed. Combustion experiments were carried out using SUS combustor and $H_2$/air mixture. Temperatures were measured with different equivalence ratios and $H_2$ flow rates. $H_2$ conversion rates were calculated by the analysis of product gas using gas chromatography. Catalytic combustion of $H_2$ was complete and stable with Pt/$Al_2O_3$ coated nickel foam and influences of water vapor were confirmed during the beginning of combustion.

• 한국수산과학회지
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• 제30권3호
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• pp.334-339
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• 1997

포말 분리법에 의한 양어장 순환수 중의 고형물 제거 특성을 조사하였다. 장치의 효율에 영향을 미치는 주요인자들은 공탑 공기유속, 체류시간, 그리고 포말층의 높이였다. 측정된 양어장수 시료 내에는 총 단백질량의 약 $50\%$정도가 계면 활성 성분이었다. 공탑 공기유속, 체류시간이 증가함에 따라 단백질, T-N. TA 및 고형물 성분들의 제거율은 증가하였으며, TVS의 제저율은 공탑 공기유속 및 체류시간 (HRT)이 증가함에 따라 증가하였으나 포말층 높이가 높아짐에 따라서는 감소하였다. 포말분리장치는 양어장 순환수 중에서 발생되는 어류 성장에 유해한 성분, 특히 TA 및 TVS의 제거에 우수한 성능을 보임을 알 수 있었다.