전해질용액 기포탑에서의 기체체유량 및 축방향혼합에 관한 연구

함영민,도동섭,최청송 한국화학공학회 1981 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.19 No.4

電解質特性이 氣體滯留量과 軸方向混合에 어떠한 影響을 미치는지에 關하여 考察하였다. 實驗은 直徑이 5.4㎝인 氣泡塔에서 1.3∼9.7㎝/sec의 氣體流速範圍와 0.5∼2.1㎝/sec의 液體流速範圍에서 행하여졌다. 0.001N∼0.1N로 變化시킨 電解液에서 電解液의 特性을 나타내는 이온세기와 氣體流速 및 液體流速으로 氣體滯留量을 나타내었다. 한편, 層流範圍와 亂流範圍의 各 흐름영역에서 混合程度와 그 傾向은 상당한 차이를 나타내는데 層流領域에서 亂流範圍로 벗어나는 대략적인 氣體의 轉移速度는 最小相對速度로무터 決定할 수 있으며, 이 轉移速度도 또한 이온세기로 相關지어 나타내었다. Gas hold-up and liquid phase axial dispersion coefficient have been measured in a bubble column of 5.4㎝ diameter in which ionic solutions(in the range of concentration of 0.001N to 0.1N) were employed in order to determine the effects of ionic strength on the objective parameters. The gas velocity corresponding to minimum relative velocity is important in determining the ultimate bubbly flow regime, which is transited to turbulent flow. This transition gas velocity, V_(gt), is correlated with ionic strength of electrolytes. Effects of gas velocity(1.3∼9.7㎝/sec), liquid velocity(0.5∼2.1㎝/sec) and especially ionic strength on axial dispersion of liquid and gas phase hold-up are determined. In the turbulent flow regime, the dispersion coefficient was found to be strongly affected by gas and liquid velocity, however, in the case of bubbly flow regime, the coefficient was not much affected by fluid velocities.

Isolation of a New Phlorotannin, Fucodiphlorethol G, from a Brown Alga Ecklonia cava

함영민,Jong Seok Baik,Jin Won Hyun,Nam Ho Lee* 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.9

氣體吸收塔에서 物質傳達에 미치는 混合特性에 관한 硏究

咸榮敏 檀國大學校 出版部 1991 論文集 Vol.25 No.2

$SO_4^{2-}/Al_2O_3$의 표면전하밀도와 산적특성

함영민,홍영호,장윤호 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.11

SO42-/Al2O3 powder was prepared by the coprecipitation method from the Al(NO3)3.9H2O and NH4OH and followed by being treated with various concentrations of sulfuric acid. The characterization of these powders was performed with XRD, BET and FT-IR. The surface charge density at alumina/KCl(aq) interface was measured by potentiometric titration method. From the experimental data it was shown that acid strength, specfic surface area, and structure of surface treated alumina were independent on the amount of exchanged SO42-. However, the acid amounts of alumina were increased with the amounts of SO42- formed on alumina surface. The relation between the acid amount of SO42- ion exchanged alumina surface and the surface charge density for SO42-/Al2O3/KCl(aq) interface was investigated.

연구발표논문초록 : 충전기탑포에서 (充塡氣塔泡) 축방향 혼합과 물질전달에 관한 연구

함영민,도동섭 한국화학공학회 1977 정기총회초록집 Vol.- No.-

풋감 주정 추출물의 유전독성 연구

함영민,윤선아,현호봉,고보람,정용환,오대주,윤원종 한국식품위생안전성학회 2020 한국식품위생안전성학회지 Vol.35 No.6

감은 중국, 한국, 일본, 브라질, 터키, 이탈리아 등을 포함하는 온대지역에서 널리 재배되고 있으며 일부 아시아권 소비자들에게는 건강에 유익한 기능성 원료로 인식되고 있다. 또한 감에 포함된 풍부한 파이토케미컬들은 감을 섭취함으로써 건강과 관련된 다양한 문제점을 개선하기 위한 연구의 가능성을 제시한다. 본 연구에서는 감의 미숙과인 풋감추출물(DKA)의 유전독성을 확인하고자 한다. 미생물복귀돌연변이시험, 염색체이상시험, 포유류 소핵발생 시험을 수행하여 풋감추출물(DKA)의 유전독성을 평가하였다. 미생물복귀돌연변이시험에서 DKA는 Salmonella typhimurium TA98, TA100, TA1535, TA1537 와 Escherichia coli WP2uvrA에서 S9 대사활성계의 존재에 상관없이 돌연변이 유도를 보이지 않았다. 또한 마우스를 이용한 소핵 시험은 풋감추출물(DKA)처리군에서 소핵을 가진 다염성 적혈구와 전체적혈구 중 다염성 적혈구의 비율의 증가는 볼 수 없었으며 통계학적 유의성도 나타나지 않았다. 한편, CHL 세포를 이용한 염색체이상시험에서 모든 세포주 의 처리시간 및 S9 대사활성계 존재유무에 상관없이 염색 체이상을 보이지 않았다. 따라서 본 연구결과에 의하면 풋 감추출물(DKA)은 유전독성을 유발하지 않는 안전한 기능성 식품 원료로서 활용 가능하다고 판단된다. The persimmon is commonly cultivated in temperate regions of the world, including China, Korea, Japan, Brazil, Turkey, and Italy. In some Asian cultures, consumers are aware of the health claims related to the persimmon and its functional ingredients. The rich phytochemistry of the persimmon has opened new avenues of research on diet-based regimens designed to cure various ailments. This study was conducted to identify the genotoxicity of immature green persimmon (Diospyros kaki THUNB.) extract (DKA). The bacterial reverse mutation assay, the chromosomal aberration assay, and the mammalian micronucleus test were performed to determine the DKA genotoxicity. The result of the bacterial reverse mutation assay revealed that the DKA did not induce mutagenicity in Salmonella typhimurium TA98, TA100, TA1535, TA1537 and Escherichia coli WP2uvrA with or without metabolic activation of S9 mixture. The oral administration of DKA also caused no significant increase in the number of micronucleated polychromatic erythrocytes or in the mean ratio of polychromatic to total erythrocytes. In addition, DKA did not cause a significant chromosome aberration on CHL cells in the presence or absence of S9 activation. In conclusion, DKA could be considered as a reliable and safe functional food since no toxicity was found under the condition of this study.

단열 기-액 유동순환반응기에서 이탈온도의 제어에 관한 연구

咸榮敏 단국대학교 1989 論文集 Vol.23 No.-

This study was carried out to investigate the effect of control actions, types of recycles, recycle ratio, and feed temperature for the control of temperature excursion in an adiabatic ebulluated-bed recycle reactor. When there is a rise is feed temperature , it is desirable to use proportional integral control and to recycle from the bottom section of reactor. However, when the value of recycle ratio in recycle reactor is changed, disturbances of temperature in bed cannot be controlled by control actions or types of recycle.

외부 순환식 Air - Lift 기포탑에서의 액체의 흐름특성

함영민,도동섭,권선길 한국화학공학회 1982 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.20 No.5

외부 순환을 동반한 Air-lift 기포탑에서 액체높이 및 기체유속을 변수로 하여 액체의 흐름특성을 규명하였다. 혼합시간 및 순환시간을 정의하고 이들을 Peclet 수와 관련지었다. Peclet 수는 혼합시간과 순환시간과의 비가 증가 함에따라 또 탑내 액체의 높이와 탑높이와의 비가 증가함에 따라 증가하였으며 그 관계는 다음과 같은 식으로 표시할 수 있다. P_e=23.25(T_M/T_C)^(0.13)(h/H)^(2.19) The flow characteristics of liquid was investigated in an air-lift bubble column with an external recirculation of liquid. The Peclet number was correlated in terms of the defined mixing and circulation times. The Peclet number increased with increasing the ratio of mixing time to circulation time and of liquid height to column height. The relationship could be expressed by the following correlation: P_e=23.25(T_M/T_C)^(0.13)(h/H)^(2.19)

충전 기포탑에서의 축방향 혼합과 물질전달에 관한 연구

함영민,도동섭 한국화학공학회 1977 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.15 No.4

원통형 금망을 充塡한 充塡 氣泡塔에서 impulseresponse technique을 適用하여 測定한 液體의 軸方向 分散係數와 物質傳達과의 關係를 규명하였다. 이때, 液相으로는증류수를, 氣相으로는 CO₂와 공기의 混合기체를 使用하였다. 硏究結果에 의하면 物質傳達係數는 氣體流速과 軸方向 分散係數가 증가함에 따라 증가하였으며, 그 關係는 다음과 같은 式으로 표시할 수 있다. K_(L)α = 0.036 V_g^(0.76)D^(2.22) Mass transfer characteristics were investigated in a counter-current bubble column packed with cylindrical screen rings and correlated with the axial dispersion coefficient measured by an impulse response technique. Absorption of CO₂ by water in the column was used for this investigation. The volumetric coefficient of liquid phase mass transfer was found to increase with increasing superficial gas velocity and axial dispersion coefficient of liquid. The relationship could be expressed1y the following correlation : K_(L)α = 0.036 V_g^(0.76)D^(2.22)

金綱 充塡管을 통한 氣體-固體의 輸送에 관한 硏究

咸榮敏,趙熙俊,洪英浩,張潤鎬 단국대학교 1987 論文集 Vol.21 No.-

This study was carried out to investigate the effect of solid mass flow rate and mean particle diameter on minimun carrying velocity, which was defined as the superficial gas velocity of the upper limit of choking phenomenon, when vertical pneumatic conveying was made through a screen-packed pipe whose inner diameter and length were 4.6cm and 180cm respectively. It was also examined the effect of superficial gas velocity, solid mass flow rate and mean particle diameter on pressure drop. And these minimum carrying velocity and pressure drop were compared with those in an empty pipe. Superficial gas velocity was taken 3.0m/sed to 5.5m/sec. Solid mass flow rate was controlled by five orifices which had different opening dimensions and its range was 2.90g/sec to 16.35g/sec. Silica sand of three sizes (mean diameter; 425㎛, 280㎛, 180㎛) was used as solid particle. The pressure drop in a screen-packed pipe increased as superficial gas velocity, solid mass flow rate and mean particle diameter increased. And the pressure drop in an empty pipe also increased according to the increase of solid mass flow rate, but it decreased though superficial gas velocity increased within the range of experimental conditions. In the case of minimum carrying velocity, it increased as solid mass flow rate and mean particle diameter increased. The pressure drop in a screen-packed pipe was far higher than that in an empty pipe. However, the minimum carrying velocity in the former was slightly lower than that in the latter.