In this study, we have modeled the rear side of the HVAC diffuser with square prism and tried to investigate the influence of a wake flow by PIV and a numerical analysis using computational fluid dynamics based on steady-state Navier-Stokes equation and standard k-ε model. A commercial CFD program, FLUENT, is used on the analysis. The wake is generated by a square prism, which is installed at the divergent flow. The results show that a fluid are distributed up and down directions of prism, and the recirculation regions are decreased.

The flow acting on a confined jet flow can be represented as a conventional turbulence flow with its complex phase and characteristics. This is still effectively applied in a variety of industries, for example in ejectors. In this study coaxial confined model made of transparent acrylic pipe and driving water nozzle in order to figure out of recirculation flow near the wall of pipe and prove how flow in the pipe can be developed. It was revealed that length of the recirculation flow adjacent to wall of pipe was characterized to be larger when Reynolds Number is getting bigger.

In physical engineering, the turbulent flow on the surface roughness is very important. The roughness of the surface changed the distance of the interval. The roughness coefficient occurred with increasing turbulence intensities was stronger. The turbulence intensity away from the roughness in the shape was zero. The variation of turbulence intensity at the experimental flow conditions change was not affected.

In this paper, a automatic transmission shift quality simulator is developed using MATLAB Simulink. The shift simulator is developed using the dynamic models of the automatic transmission with torque converter, and vehicle dynamics and the hydraulic control system, which consists of solenoid valve, pressure control valve, accumulator and actuator.

An eductor is an fluid transportation simplified device that generate relatively low pressure utilizing the kinetic energy of pressured fluid to provoke suction of another fluid, mix the two and discharge the mixture against a counter pressure. In this study, a parameter analysis was conducted to predict the eductor performance against various operating conditions.

This study involved the shape of water jet nozzle to promote blasting ability and an increase of projection distance when cleaning VLBC cargo hold. Simulation of water jet projection process inside VLBC cargo hold was done in both 2D and 3D environment. The result are promising since both case show the capability of water contacting the desired target.

An ejector is an fluid transportation simplified device that generate relatively low pressure utilizing the kinetic energy of pressured fluid to provoke suction of another fluid, mix the two and discharge the mixture against a counter pressure. In this study, a parameter analysis was conducted to predict the ejector performance against various operating conditions. It was revealed that the loss coefficient of the nozzle, pressure ratio, flow rate and size of suction area has the greatest effect on the efficiency of the eductor and showed efficiency of eductor is proportion to increase of flow rate.

This study involved the shape of water jet nozzle to promote blasting ability and an increase of projection distance when cleaning VLBC cargo hold. Furthermore, I researched the effect of pressure, length of reducer, nozzle caliber size and nozzle shape on the nozzle through CFD simulation. Simulation of water jet projection process inside VLBC cargo hold was done in both 2D and 3D environment. Simulation results show installing suitable nozzle can increase the cleaning effect of cargo hold.

본 연구는 조직동일시의 선행 변수로서 개인-조직 가치 일치와 조직 기반 자존감을 설정하여 이들 변수가 조직동일시에 미치는 영향을 분석하였다. 그리고 조직동일시가 결과변수인 조직시민행동에 미치는 영향과 선행변수와 결과변수 사이에서 조직동일시의 매개 효과를 분석하였다. 조직동일시는 조직구성원이 조직 이익에 부합되는 행동을 하도록 하여 조직을 위한 자발적 노력이 곧 개인을 위한 노력이라는 동기부여 기능을 한다. 본 연구는 666명의 직원을 대상으로 공분산 구조분석으로 실증분석을 하였다. 실증분석결과 개인-조직 가치 일치와 조직 기반 자존감은 조직동일시에 긍정적인 영향을 미쳤다. 그리고 조직동일시는 조직시민행동에 긍정적인 영향을 미치는 것으로 나타났다. 또한, 조직동일시는 개인-조직 가치 일치 및 조직 기반 자존감과 조직시민행동 사이에서 매개효과를 나타냈다. 분석결과 조직구성원들의 조직동일시를 높이기 위해서는 개인과 조직의 가치 일치 수준을 높여야 할 것이다. 또한, 조직 기반 자존감이 높은 구성원들은 자신들 자아의 유지 혹은 향상을 위해 조직동일시를 지향할 것이다. 그리고 개인-조직 가치 일치와 조직 기반 자존감은 매개변수인 조직동일시를 통해 조직시민행동을 유발하는 것으로 나타났다.

In this study, the flow characteristics at the front and the rear side of the diffuser installed in the AHU for Offshore HVAC system were studied. Set up the rectangular prism of which height is H at diffuser inlet duct, the flow control methods were considered using PIV and CFD numerical analysis. Average flow velocity was increased by 37% and the degree of flow uniformity was 96.7% at x/H =1.5.

The representative emission index and indicator are the EEDI (Energy Efficiency Design Index) for the new ships and EEOI (Energy Efficiency Operational Indicator) during the voyage. In this paper, derating of diesel main engine are introduced for the purpose of improving EEDI. The results showed good agreement explaining the characteristics properly.

In this study, a scaled model chamber was built to investigate ventilation characteristics of the pump room in tanker and to look into stationary areas of flow field. Experimental study was performed for three kinds of Reynolds number based on the inward velocity and height of inlet port in model by visualization equipment with laser apparatus. The flow pattern reveals the large scale counterclockwise forced-vortex rotation from upside louver to lower scupper toward diagonal corner and also found small eddies at bottom layer.

The development of a high pressure cleaning system is needed to properly clean cargo hold and improve the working environment of a ship. For this, the study on the parameters related to the suitable capacity of a pressure pump should be preceded.