The heat transfer of Jet impingement is a very effective technique for exchanging high heat fluxs between a heated plate and a fluid. The purpose of current investigation is to carry out the experiment in order to study heat transfer characteristics between a vertical round water jet and a horizontal surface for different flow rates and geometric conditions. The effect of flow rates on heat transfer were investigated. The data obtained in this study are represented in terms of Nusselt number as a function of Reynolds and Peclet numbers. The correlation for the Nusselts number in terms of the Peclet number and  was obtained. The proposed correlation predicts the current data of heat transfer very well.

The numerical study of laminar syngas-fuel/air mixture with 10% hydrogen content impinging plate was conducted. Effects of impinging distance, Reynolds number and equivalence ratio were major parameters on combustion and emission for stagnation point. The numerical result calculated by SPIN application of the CHEMKIN software. There result showed the following : The Peak point of the axial velocity, the flame temperature and CH reaction were appeared in tip of the inner reaction zone. The emission results in impinging flame of syngas fuel show that the characteristics of NOx emission traced well with adiabatic temperature trend and CO emission due to fuel rich condition increased continuously with respect to the equivalence ratio.

LNG 선박에서 발생하는 슬로싱 충격하중은 다상유동 및 기체의 압축효과에 따라 CCS에서 발생하는 압력과 구조응답에 큰 영향을 미칠 수 있다. 본 연구에서는 슬로싱 운동 시 LNG의 유동에 의해 발생하는 슬로싱 충격을 시뮬레이션하기 위해서 다상유동을 적용한 수치해석 모델을 제시하였으며, 그 결과를 실험과 비교하여 타당성을 검토하였다. 또한 효율적인 구조응답 계산을 위해 분사모델을 이용한 유체구조 연성해석 방법에 대해서 검토하고 멤브레인형 Mark III 화물창의 강도평가에 적용하여 LNG 화물창의 강도평가를 위한 가능성을 검토하였다.

A cooling system that applies impinging jet is studied. To create a jet, a square edge type nozzle is used as its shape. The impinging jet that composes a cooling system which applies impinging jet is created in the nozzle plate that correspond to each LED where the cooling area exists. The distance(d) between the nozzle plate and LED plate with heat sink is where the LED light is established. The main variation and the standard is examined for four different cases through the way out diameter of nozzle plate exit(D). The examined velocity distribution and temperature distribution about the impinging jet cooling system consisted of nozzle plate. It was found that an individual LED consisting of nozzle plate was efficient.

A cooling system that applies double collision jet is studied. To create a jet, a square edge type nozzle is used as its shape. The impinging jet that composes a cooling system which applies double impinging jet is created in the single nozzle and double nozzle that correspond to each LED where the cooling zone exists. The distance between the 2nd nozzle and LED with heat sink is where the LED package is established. The main variation and the standard is examined for four different cases through the way out diameter of 1st nozzle. The examined velocity distribution and temperature distribution about the cooling system consisted of single and double nozzle. It was found that an individual LED consisting of double nozzle was efficient.