• Title/Summary/Keyword: supplying water

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Effects of Carrier Air Supplying Parameter on the Internal Flow Characteristics of an Adaptor in Two-Fluid Nozzle (이유체노즐의 액체이송공기 공급방법에 따른 어뎁터 내부유동특성에 관한 해석적 연구)

  • Park, S.H.;Cho, M.H.;Kim, D.J.;Lee, J.K.;Rho, B.J.
    • 한국전산유체공학회:학술대회논문집
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    • 2008.03b
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    • pp.65-70
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    • 2008
  • The numerical simulation on the internal flow characteristics of the adaptor in a two-fluid nozzle has been performed to investigate the effects of carrier air supplying parameters using a commercial code. The four adaptor models with the different positions in the carrier air supplying port were considered at the fixed conditions of urea-water solution and carrier air supplying. As the results from the numerical analysis, the internal pressure of the adaptor was varied with the port position for carrier air supplying, and it shows lower pressure value than the atmospheric pressure. Consequently, the flowrate of urea-water solution issuing from the feeding injector with the adaptor varied up to 30% with the port positions for the carrier air supplying. When the carrier air is supplied from the side from the feeding injector axis and the upper part from the feeding injector tip, the flowrate of urea-water solution issuing from the feeding injector with the adaptor show higher value than other carrier air supplying conditions.

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Estimation of Optimal Diversion Water from Keumgang Lake for Supplying Dilution Water to Saemangeum Lake (새만금호 희석용수 공급을 위한 금강호에서의 적정 도수량 산정)

  • Lee, Duk-Joo;Kim, Tai-Cheol
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • 2003.10a
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    • pp.243-246
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    • 2003
  • The connection channel for Saemangeum district is to link the lakes between Keumkang Lake and Saemangeum Lake and to dilute the polluted water flowing from Mankyung river, to accelerate desalinization in Saemangeum lake, and to satisfy the future demand of water around Saemangeum district. Therefore, this study is to investigate the surplus water in Keumgang Lake after supplying the current agricutural, life, and industrial water and to check the possibility to divert the surplus water to Saemangeum Lake

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Determination of Leaching Requirements in the Unripened Tidal Reclaimed Paddy Fields (간척초기답의 제염용수량 결정을 위한 기초연구)

  • 손재권
    • Magazine of the Korean Society of Agricultural Engineers
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    • v.42 no.2
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    • pp.55-62
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    • 2000
  • In order to make the reasonable irrigation plan in the unripended tidal reclaimed paddy fields, the estimation of irrigation water requirements by soil textures and water management methods for the normal growth of crops is very important . This study was carried out to determine leaching requirements before cultivating crops. For the purpose of this study, the physical and chemical properties of soil samples used in the desalinization experiments were analyzed, and change of salinity by supplying water and leaching water were investigated in the experimental field with lysimeters. As a result considering the soil textures, desalinization effects of good drainage soils(S1) were better than those of poor drainage soils (S2). In the changes of salinity of the soils with supplying water by water management methods, among the good grainage soils with culvert treatment(S1CW), salinity of S1CW3 with 1, 120mm and S1W4 with 1, 440mm supplying water were 2.6dS/m and 1.1dS/m respectively, and salinity of S1NW4 with 1.680mm among those non-culvert treatment (S1NW) was 3.0dS/m, less than critical salanity value 3.0dS/m. On the other hand, of the poor drainage soils with cultvert treatment , salinity of S2CW3 was ranged 9.4-6.0dS/m with supplied water, and that of non-culverted treatment S2NW as 12.3-8.4dS/m.

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An Analysis of Influences on Partial Work Rates under the Whole Work Rates on the Landscape Constructions in the Ulsan Grand Park (울산대공원 조경공사의 각 세부공정이 전체공정율에 미치는 영향분석)

  • 성백진;이재근;최종희
    • Journal of the Korean Institute of Landscape Architecture
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    • v.31 no.6
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    • pp.64-72
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    • 2004
  • This study analyses influences on partial work rates under whole work rates on landscape constructions in Ulsan Grand Park. The schedule management is one of the factors that are very important to the process management of landscape construction. The time process of the whole construction is supposed to be affected by several kinds of work that organize the whole construction. First, this study divides the construction of Ulsan Grand Park into 10 kinds of works: earth work, rain and sanitary sewage water work, water-supplying work, planting work, paving work, water proofing work, fountain work, instituting work and temporary work. Then the time-process curves of all kinds of work are statistically compared to that of the whole construction. The trial methods of statistics are lineal regression, non-lineal regression, and principal analysis. In the result of the non-lineal regression, the rain and sanitary sewage water work, the water-supplying work and the earth work strongly affected the whole construction. The principal analysis results show that the whole construction is affected strongly by the water-supplying work, the rain and sanitary sewage water work and the earth work. However the lineal regression is shown to be senseless because of its high collinearity.

CFD Analysis on Flow Characteristics of Oil Film Coating Nozzle (유막 코팅 노즐의 유동특성에 관한 CFD해석)

  • Jung, Se-Hoon;Ahn, Seuig-Ill;Shin, Byeong-Rog
    • The KSFM Journal of Fluid Machinery
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    • v.11 no.5
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    • pp.50-56
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    • 2008
  • Metal cutting operations involve generation of heat due to friction between the tool and the pieces. This heat needs to be carried away otherwise it creates white spots. To reduce this abnormal heat cutting fluid is used. Cutting fluid also has an important role in the lubrication of the cutting edges of machine tools and the pieces they are shaping, and in sluicing away the resulting swarf. As a cutting fluid, water is a great conductor of heat but is not stable at high temperatures, so to improve stability an emulsion type mixed fluid with water and oil is often used. It is pumped over the cutting site of cutting machines as a state of atomized water droplet coated with oil by using jet. In this paper, to develop cutting fluid supplying nozzle to obtain ultra thin oil film for coating water droplet, a numerical analysis of three dimensional mixed fluid Jet through multi-stage nozzle was carried out by using a finite volume method. Jet flow characteristics such as nozzle exit velocity, development of mixing region, re-entrance and jet intensity were analyzed. Detailed mixing process of fluids such as air, water and oil in the nozzle were also investigated. It is easy to understand complex flow pattern in multi-stage nozzle. Important flow Information for advance design of cutting fluid supplying nozzle was drawn.

A Study on the Seasonal Pre-reserved Planning of Water Resources in Korea (수자원의 계절별 적기확보방안에 관한 연구)

  • Heo, Jun-Haeng;Song, Jae-U;Lee, Gil-Chun
    • Water for future
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    • v.16 no.2
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    • pp.111-122
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    • 1983
  • The water demand has been rapidly increased by the growth of population, industrialization, unbanization, water pollution and so on. This study carried out the seasonal pre-reserved planning for the five zones, comparing the water demand with the available water resources up to the goal year, 2001. The results of this study are as follows; 1) It is principle that the monthly water demand is supplied by the surface and ground water as the increasing tendency of it, and the deficit of water is supplemented by the water supplying capacity of dam. And water demand should be completely reserved before supplying the deficit of water. 2) The monthly and seasonal maximum deficit of water demand take place in June and summer. 3) The periods when the deficit of water demand exceeds the water supplying capacity of dam are 1984-1990, 1994-2001 in zone III. 4) To reserve the deficit of water demand in zone III, we would like to pre-construct Masan-Keumbo estuary barrage from 2001 to 1991 in Seomjin river basin, the deficit of water demand is supplied by the diversion of water from Yeongsan river basin with the developments of the ground water and small reservoirs until 1986.

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The Investigation of Faunal Habitat Based on Ecological Rostoration of Urban Streams in Ulsan (울산시 도심하천의 생태하천 복원사업에 따른 동물상 서식실태 조사 분석)

  • Cho, Hong Je;Kang, Ho Seon
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.16 no.5
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    • pp.1-17
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    • 2013
  • We researched the fauna restoration of 5 urban streams in Ulsan established as ecological streams by improving water quality and river environment. The fauna inhabitation were compared according to the conditions of geometrical feature such as river width, low-water channel width, ect and water quality, water volumn, inland and forceland. The Mugeo cheon has clearly shown the fauna restoration effects resulting from supplying sustainable maintenance water and wastewater treatments. In the Yaksa cheon, on the other hand, the restoration effects were low due to the inflow of wastewater and sledges in some part of stream ever though the improvement of water quality. The Yeocheon cheon was found to have disadvantage on the ecological inhabitations due to supplying the maintenance water with highly concentrated salinity. The fauna restoration effect of the Meongjeong cheon was low due to the inflow of wastewater to the down stream. Therefore by supplying the maintenance water and improving the connection to the Taehwa river at the estuary, better restoration effects could be observed. In the Cheokgwa cheon, which is almost a natural river, the ecological integrity of the fauna population has been maintained quite well. It was concluded that the project to transform urban streams into ecological streams should focus on not only keeping water volume and quality but also maintaining favorable conditions for the migration and settlement of animal species close to the natural state.

A Study of the Guided Wave Propagation in the Water Supplying Pipes with Scale (스케일이 있는 급수관내의 유도초음파의 전파 특성에 관한 연구)

  • Song, Sung-Jin;Lee, Dong-Hoon;Lee, Hyun-Dong;Bae, Cheol-Ho;Park, Jung-Hoon;Kim, Young-H.
    • Journal of the Korean Society for Nondestructive Testing
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    • v.23 no.1
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    • pp.1-6
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    • 2003
  • Since the scale in pipes reduces the flow rate, a quantitative evaluation of the scale is essential for the proper maintenance of pipes. Guided waves were employed to estimate the amount of scale in water supplying pipes. Using variable angle wedge, several modes of guided waves wire generated and their propagation charcteristics along the pipes with stale were analyzed. It was experimentally observed that the amplitude of F(M,2) modes at $f{\times}d=1.5MHz\;mm$ decreased significantly with increasing amount of scale. The present study showed that F(M,2) modes were optima) to evaluate the scale in water supplying pipes.

Evaluation of Water Supply and Selection of Deficient Districts in Gunwigun Farmland for Drought Response (가뭄대책 수립을 위한 군위군 경작지의 용수공급 평가와 부족지구의 선정)

  • Ahn, Seung Seop;Park, Ki bum
    • Journal of Environmental Science International
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    • v.29 no.11
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    • pp.1099-1108
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    • 2020
  • In this study, the capacity of supplying agricultural water to 13 districts was analyzed by calculating the necessary water supply for the arable land of Gunwi-gun and examining the capacity of supplying water to reservoirs, streams, pumping stations, collection sites, and groundwater wells in Gunwi-gun. As a result, among the 13 districts the second district was found to be short of water by 1.2×106 tons/year. In general, local governments establish drought measures by selecting drought disaster risk zones. While selecting drought-risk areas, some water-poor areas that do not have water sources should be selected, even if the entire area has a sufficient water supply. The water-supply evaluation at the regional level was insufficient for locating areas without water sources, but most areas with water sources, such as streams, reservoirs, and pumping stations, were found to have no shortage of water. To locate water shortage areas without water sources, GIS analysis conducted a field survey of areas with a distance of 4 or less than that of water sources analyzed by GIS analysis. Sixty-nine sites in 13 districts were selected for the on-site survey and six areas of water shortage were identified in areas other than the second district.

An Ecological Restoration of Urban Streams by Supplying Maintenance Water (도시하천의 유지용수 공급에 따른 생태복원)

  • Cho, Hong Je;Lee, Su Ji
    • Journal of Wetlands Research
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    • v.15 no.3
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    • pp.317-328
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    • 2013
  • The aim of this study is to compare the effects of the maintenance water supply methods on the ecological restoration of 5 urban streams such as Mugeo cheon, Yaksa cheon, Yeocheon cheon, Myeongjeong cheon and Cheokgwa cheon in Ulsan metropolitan city. Water quality of the streams have been innovatively improved and the ecosystems have gradually been restored by supplying maintenance water constantly. However, we found that if the maintenance water was in a state of higher salinity or low quality, even enough supply was not helpful and even harmful for ecological restoration. We confirmed that the most important things to create or maintain from the urban stream to the ecological stream are that facilities like a walkway construction should be installed at least, supplying appropriate maintenance water, and a connection with the main stream.