In order to measure the flow rate of liquid sodium, the flow measurement method should be determined by considering the opacity of sodium, the chemical reaction with air and water, and so on. By using the segmental wedge flowmeter which is one of the representative devices for flow measurement, the methodology for measuring the liquid sodium flow was examined and the flow characteristics were observed. The variations of the discharge coefficients according to various flow conditions were also evaluated. In addition, the structural integrity at high temperature condition was evaluated by using the liquid sodium as a working fluid and these study results were reflected in the design of the segmental wedge flowmeter.

In this theoretical study, a design and performance analysis theory of a micro flowrate and high pressure air-compressor is developed. The governing equations are from the gas state equation and fluid dynamic theories because the working fluid in the air compressor is in a gas phase. A case study was conducted to design a reciprocating type of air compressor which the target performance was 0.6liter/min in the volume flowrate with 5atg in air pressure at 1,600rpm rotational speed. Geometrical size of the model air compressor designed is 10mm in stroke, 20mm in bore with 4.79 compression ratio. From the performance analysis of the model compressor, it was found that the air volume flowrate produced was 0.6liter/min with 5.81atg in pressure. The design theory of a micro-size high-pressure air compressor developed in this study is expected to be very useful design tools in NANO technology industry.

구하도 및 폐천복원은 하천에서의 이수와 치수적인 기능뿐만 아니라 환경 및 생태 서식처 기능을 강화하고 개선하기 위한 여러 방법들 중 하나이며 이러한 구하도를 복원하기 위해서는 주수로와의 하도 안정성을 고려하여 횡단면 형태를 결정하고 하도선형을 설계하게 된다. 이러한 하도설계시 기준이 되는 유량이 반드시 필요하며 이 기준유량을 하도형성유량 또는 지배유량이라고 한다. 일반적으로 하도형성유량을 산정하는 방법으로는 만제유량, 특정 재현기간별 유량, 유효유량을

밸브는 선박에서 유체의 흐름과 유량을 제어하기 위해 사용된다. 유량 계수는 밸브의 설계에서 매우 중요한 요소이다. 본 연구에서는 상용프로그램인 CFX의 3차원 컴퓨터 시뮬레이션을 이용하여 동일한 유속이 적용될 경우 밸브의 형과 밸브 열림 각도에 따른 유량 계수를 계산하였다. 그리고 실험 결과와 비교하여 CFX 시뮬레이션 해석을 통해 얻은 결과의 신뢰성을 검증하였다.