지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
논문 기본 정보
- 자료유형
- 학술대회자료
- 저자정보
- 발행연도
- 2011.11
- 수록면
- 253 - 258 (6page)
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초록· 키워드
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The discharge capacity of PVDs was evaluated using KS K 0940(or ASTM D 6918 method B) with various test conditions: hydraulic gradient (range from 0.1 and 1.0), air bubble effect (dry and wet conditions in setting procedure of PVDs) and applied pressure (constant and stepwise). In order to evaluate the effect of hydraulic gradient, the discharge capacity was measured using metal cores with 4 different depths preventing the shape changes of cores. The discharge capacity increases as hydraulic gradient decreases and the core depth increases. It was found that the laminar flow is created when the hydraulic gradient is lower or equal to 0.1. The results show that there is quite a possibility of occurrence of turbulent flow during the test when the hydraulic gradient is 0.5 according to KS K 0940. For getting more insight into the long term effects, the pressure was increased by weekly steps: 50, 150, 250 and 300 kPa. The discharge capacities under stepwise condition were compared with those under the constant pressures of 300 kPa during four weeks. The discharge capacity decreases under stepwise condition as the pressure increases with time while it varies largely with time under constant pressure. To investigate the effect of air bubble on the discharge capacity, the PVDs were mounted on the test equipment in dry and wet states. It is expected that air bubbles occurred in the channel of PVDs in wet condition. The discharge capacity in wet condition is lower than that in dry condition, because the air bubbles obstructed the flow in channels. In this study, the appropriate test conditions and procedures were recommended for measuring the drainage property of PVDs with better repeatability and reproducibility.
목차
ABSTRACT
1. INTRODUCTION
2. EFFECTS OF THE HYDRAULIC GRADIENTS
3. EFFECTS OF THE APPLIED PRESSURES
4. EFFECTS OF THE AIR BUBBLE ON DISCHARGE CAPACITY
5. SUMMARY
ACKNOWLEDGEMENTS
REFERENCES
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UCI(KEPA) : I410-ECN-0101-2013-532-001119391