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김용우,이명준,이상석,정성식,하종률 동아대학교 생산기술연구소 1999 生産技術硏究所硏究論文集 Vol.4 No.1
This study is to investigate the influences of water vapor on evaporation of single droplet. We obtained the time histories of droplet diameter from droplets image taken by a CCD camera. Droplets of water-soluble ethanol and water-insoluble paraffin hydrocarbon droplets were exposed in temperature, 473K and atmospheric pressure as the ambient condition. The following are results about evaporation of single droplet which exposure in the field of water vapor of high temperature. There is almost none which water vapor concentration affect on water droplet. But, ethanol droplet had significant influence. In the case of n-heptane has the boiling point which is lower than the boiling point of water, a evaporation rate increase with water vapor concentration. The evaporation rate of n-hexadecane which is higher than the boiling point of water and water-insoluble paraffin hydrocarbon droplet also increased in the high moisture environment.
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백병준 한국마린엔지니어링학회 1998 한국마린엔지니어링학회지 Vol.22 No.4
Evaporation and ignition characteristics of fuel droplet have major influences on the efficiency and performance of engine. In the present study the experiment of evaporation and self-ignition of single fuel was performed under the various ambient conditions. An individually suspended droplet of n-heptane n-hexadecane ethyl-alcohol and light oil were employed as a liquid droplet. Evaporation and ignition characteristics were measured by using the video-camera and image processing technique under the various ambient temperatures (up to 1000310 OC)and partial pressure of oxigen(up to 60%) The evaporation curve shows that the droplet life time ignition delay time decreases as the ambient temperature and partial pressure of oxigen increase, The temperature variations of droplet were also reported for various fuel and ambient temperatures. The numerical simulations were carried out to predict droplet diameter and temperature with favorable agreement.
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방창훈,정재학,김정수 慶北專門大學(영주경상전문대학) 2000 慶北專門大學 論文集 Vol.18 No.-
Transient cooling of solid surface by water droplet evaporation has been investigated through controlled experiments using a heated brass cylinder. Quantitative predictions of droplet evaporation time and in-depth transient temperature distribution in solid have been made. The particular interest was in the removal of thermal energy from the heated cylinder by evaporative cooling. A 10㎕ single droplet is deposited on a horizontal brass surface with initial temperatures in the range of 90℃∼130℃. The results can be summarized as follows ; Evaporating droplet was divided into three different configuration. Evaporation time was predicted as function of initial surface temperature( t_c = 492.62-6.89T_(so) +0.0248T7^(2)_(so) ). The contact temperature was predicted as function of initial surface temperature( T_(i) = 0.94T_(so) +1.4). The parameter β_(o) was predicted as function of initial surface temperature ( β_o=0.00312T_(so)+0.932)
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군사용 밀폐공간내의 화재시 단일 증발액적에 의한 방재특성 연구
이진호,방창훈,김정수 한국군사과학기술학회 2000 한국군사과학기술학회지 Vol.3 No.1
A fire fighting characteristic by a single evaporating droplet in the case of a fire of military enclosure space was studied experimentally. Transient cooling of solid surface by water droplet evaporation has been investigated through controlled experiments using a heated brass cylinder. Quantitative predictions of droplet evaporation time and in-depth transient temperature distribution in solid have been made. The particular interest was in the removal of thermal energy from the heated cylinder by evaporative cooling. A $10{\mu}1$ single droplet is deposited on a horizontal brass surface with initial temperatures in the range of $90^{\circ}C{\sim}130^{\circ}C.$ The results can be summarized as follows; Evaporating droplet was divided into three different configuration. Evaporation time was predicted as a function of initial surface temperature ($t_c=492.62-6.89T_{s0}+0.0248T_{s0}^2).$ The contact temperature was predicted as a function of initial surface temperature( $T_{i}$=0.94 $T_{s0}$+1.4), The parameter ${\beta}_o$ was predicted as a function of initial surface temperature( ${\beta}_0$ : 0.O0312 $T_{s0}+0.932$)>)>)
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남시욱 ( Siwook Nam ),김혜민 ( Hyemin Kim ) 한국분무공학회 2021 한국액체미립화학회지 Vol.26 No.2
Evaporation characteristics of single butanol gel fuel were investigated in different mass ratios of gellant and ambient temperatures. Gel fuel was made by adding the pure water and hydroxypropylmethyl cellulose (HPMC) into the 1-butanol. Increase of viscosity was observed when the loading of HPMC increased. The evaporation process of gel droplet could be divided into three stages: droplet heating, micro-explosion and crust formation. Elevation of ambient temperature helped boost the evaporation in all experimental cases, but the effect was mitigated when the mass ratio of HPMC increased. Increase of HPMC weight ratio reduced the evaporation rate.
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