http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 김덕찬 (검색결과 63 건)
- 무료
- 기관 내 무료
- 유료
-
-
김덕찬,김정현 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.1
Heat dissipation during operations of electronic devices is a serious issue with device miniaturization and high power consumption. As one practical approach to reducing the device temperature, thermally conductive adhesives can be used between printed circuit board and heatsink materials. By incorporating the aluminum nitride (AlN) with acrylic copolymer matrix, thermal conductivity and adhesive properties are examined with different sizes and content of particulate fillers. Acrylic copolymer is synthesized using butyl acrylate and acrylic acid monomers via solution polymerization, and AlN particles are used as thermally conductive fillers. The overall monomer conversion reaches more than 96% after 140 min reaction time. Considering both adhesive properties and thermal conductivity of adhesives, it is desirable to apply 20 wt% nano-AlN filler to acrylic copolymer adhesives.
-
충진탑에서의 물속 클로로포름과 브로모포름의 공기 스트립핑
김덕찬 서울市立大學校 1987 論文集 Vol.21 No.2
Air stripping of chloroform and bromoform was investigated for continuous flow packed tower. It was found that the general characteristics of this stripping device can be explained at least qualitatively by the dimensionless parameter or quantity called the stripping factor. A low value of stripping factor results in an increased resistance to mass transfer of solute from water to air in the tower packing. To Minimize the adverse effect of axial dispersion at a low value of the stripping factor, particular care is needed to insure that air entering the tower is evenly distributed across the tower. For solutes more volatile than chloroform relatively high stripping factors are favored, thereby diminishing adverse effects of low stripping factor(gas phase)resistance to mass transfer, and of axial dispersion. If the stripping factor is sufficiently high that gas phase resistance becomes negligible, then the rate of removal of a solute is limited by water film resistance: this varies inversely with the square root of the moleclar diffusivity of the solute in water. Alternatively, the resistance to mass transfer in the water can be predicted for various types of tower packings using empirical liquid film correlations appearing in the technical literature of the field.
-
이명섭,김덕찬 서울市立大學校 1986 論文集 Vol.20 No.1
The characteristics of gas-liquid mass transfer in bubble column and three phase fluidized beds have been Studied in a 6.3cm I.D and 160cm height acryl column. The three phase fluidized beds were consisted of water, carbon dioxide mixed with oil-free compressed air and glass beads as liquid, gas and solid phases respectively. In this investigation, the effects of gas velocity (4.28-21.39cm/sec), liquid velocity (1.07-17.79 cm/sec) and particle size(1.3-6.0mm) on the ovlumetric mass transfer coefficient have been examined. The effects of the hight from the distributor on concentration profile and volumetric mass transfer coefficient were also determined. Volumetric mass transfer coefficient, was increased with increasing gas and liquid velocity, and particle sizes, but decreased with the height from the distributor. The concentration profile was showed exponential increasing with the height, but in the three phase fluidized beds, it was increased rapidly and decreased at once, i.e., it was exhibited the maximum value in the grid zone, and then increased continuously with the height. Volumetric mass transfer coefficient, K??, were correlated in terms of gas and liquid velocity and particle size; ????
-
-
金德燦,朴鍾燮 서울市立大學校 1990 論文集 Vol.24 No.-
In three phase fluidized beds with binary particle mixtures of glass beads, gas-liquid mass transfer characteristics have been studied in a 6.3cm I.D. and 160cm height acryl column. The three phase fluidized beds were consisted of tap water, carbon dioxide mixed with oil-free compressed air and binary mixtures of glass beads, respectively. Then binary mixtures used were five combination of three types of glass beads. Particular attention is paid to the mass transfer characteristics in bubble flow regime. Till now, the study of binary particle mixtures system in three phase fluidized beds have been reported very a few in hydrodynamics, but the study of mass transfer have been not reported. Thus, in this investigation the effects of gas velocity(2.0-10.0cm/sec), liquid velocity(1.26-15.74cm/sec) and particle size(1.3, 3.0, 6.0mm) and weight percent of binary particle mixtures on volumetric mass transfer coefficients along with the various bed height have been determined. Volumetric mass transfer coefficients, K₁a was calculated by using the computer optimization with plus flow model. In result 1. Bed porosity increased with gas and liquid velocity in beds of 3.0mm and 6.0mm single particles respectively. However, bed porosity decreased with lower gas velocity in a bed of 1.3mm single particles so that bed contraction is observed. A bed of 3.0mm single particles showed intermediate phenomena between bed expension and bed contraction. 2. The three phase fluidized beds by binary particle mixtures have been higher minimum fluidized velocity than that by single particles. Then, bed contraction was shown in beds of mixed particle with 1.3mm and 3.0mm. However, when weight fraction of large particles reached to 0.75, a bed of mixed particles was shown similar to a bed of large particles. 3. In three phase fluidized beds by binary particle mixtures bed porosity and liquid holdup were correlated in terms of Froude number of liquid and gas, and Reynolds number of liquid and gas, and Reynolds number of liquid by using harmonic mean diameter. Bed porosity εl +εg = 0.4324Fr₁ 0.0497Fr?? 0.0012Rel 0.0537 Liquid hold-up ε₁=0.1541Fr₁ 0.1917Fr?? -0.0887Re₁ 0.1596 4. In three phase fluidized bed of single particles, liquid phase concentration increased with increasing gas velocity and decreasing liquid velocity. However, in a bed of 3.0mm single particles with intermediate phenomena, liquid phase concentration increased rapidly with gas velocity in grid zone, then decreased slowly and increased again. Therefore, concentration profile of third order curve was shown. 5. In three phase fluidized beds of binary particle mixture, this tendency was similar to a bed of single particles. However, liquid phase of large and small particles had likely transitional values according to weight fraction of mixed particles. 6. Volumetric mass transfer coefficients calculated by plug flow model increased with increasing gas and liquid velocity as well as particle size and weight fraction of large particles. 7. Volumetric mass transfer coefficients, K??a, were correlated in terms of gas and liquid velocity, poarticle size and weight fraction of mixed particles. K??a=1.806x10-³u?? 0.2427u?? 0.5820d?? 0.3181d?? 0.3457x?? -0.0924x?? - 0.2200 8. Also, volumetric mass transfer coefficients, K??a, were correlated in terms of holdup of gas and liquid phase, particle size, and weight fraction of mixed particles. K??a=0.7561ε₁ 0.5677ε?? 1.6348d?? 0.1558d?? 0.6938x?? 0.8660x?? 1.3598
-
-
金德燦,安承丘,柳明辰 서울市立大學校 1985 論文集 Vol.19 No.-
Landfill gas is important to consider when evaluating the effect a landfill may have on the environment, because methane can explode. Thus, for the evaluating the parameters in gas generation from sanitary landfill site of municipal solid waste the generation mechanism was explained by taking into account anaerobic fermentation. Reported value of temperature of landfill site and C/N ratio of waste were in good condition for anaerobic fermentation. Chemical formula of waste of Nanjido disposal site was calculated to be C H O H S from the reported analytical data of chemical composition. By using this formula and predicted amount of waste was calculated to be 8.8x10 m. When using the predicted amount of decomposable components-garbage, paper, textile and wood-it was calculated to be 7.5x10 m. Assuming the decomposing period of those components the quantity of gas production with respect to time (year) was estimated by modifying the Sheldon-Arleta model.
-
삼상유동층의 수력학적 특성 : 혼합 입자층의 층 공극율 및 흐름변환 특성
김덕찬,전재호 서울市立大學校 1993 論文集 Vol.27 No.-
Minimum fluidized velocity, bed prosity and transition of binary mixed solids were measured in three phase fluidized beds. Single and binary mixture of solids varying in size have been investigated. Experiments were carried out in column made of plexiglass, 10cm in diameter and 190cm high. Three phase fluidized beds were consisted of tap water, oil free compressed air and glass beads of single and different particle size. The gas superficial velocity ranged from 2.0 to 8.0cm/s and liquid velocity from 2.0 to 10.0cm/s. Single and six combinations of glass beads of 1.2, 2.1, 2.7 and 3.8mm in diameter were employed. The following results were drawn from this study. (1) In binary mixture systems, minimum fluidized velocity and bed prosity close to that of the bed composed of a single large particle size, as the weight fraction of large particles increase. (2) Minimum fluidized velocity and bed porosity decrease with increasing the gas superficial velocity. The bed contrantion was larger when the particle size was smaller than 2.7mm at gas injection. (3) In liquid fluidized beds, binary mixed particle system was incomplete segregation state, while in gas-liquid-solid fluidized beds was in complete intermixing state. (4) The transition of binary mixed solids was not observed obviously. (5) Minimum fluidization velocity and bed porosity were correlated in terms of gas velocity and terminal velocity. ??
-
ScienceON
DBpia연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
