查詢結果分析
來源資料
頁籤選單縮合
題 名 | 鰻池中固形物運動實態解析(2)--固形物物性計測法=Modeling of the Solids Motion in Eel Pond(Ⅱ)--A Measurement Technique of the Solids Characteristics |
---|---|
作 者 | 侯文祥; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 24:1 1997.03[民86.03] |
頁 次 | 頁33-47 |
分類號 | 438.661 |
關鍵詞 | 固形物; 沉降速度; 物性; 粒度分析; 鰻池; Solid; Dropping velocity; Physical characteristics; Counting-size distribution; |
語 文 | 中文(Chinese) |
中文摘要 | 本文應用固形物分散沉降法理論和電阻抵抗法計測粒度分布原理等兩種物理觀念 組合,建立養殖池中固形物的物性解析模式,並設計可實際應用的計測方法,且以使用淡水 資源最多的日本鰻養殖為例。考慮粒子於池中沉降運動受粘滯性抵抗(抵抗係數 Cf)影響 下,當粒子與池水相對運動係數 Reynold 數 ( Re)小於 300 的實態條下,採用 Weisel | sberger 兩個經驗式,設計分散沉降用分畫筒 1.4 m 長及分割採樣時間 17 回,以求得各 | 回樣米內的粒徑與比重之相互關係值。池中存在的粒子可能比重設定於小於 3.0,粒徑範圍 則經粒度儀計測小於 280 um 等,採取給餌前池中近餌場處一個垂直水柱進行實例解析。水 柱內樣本依採樣時間分畫取得 17個樣本,利用電阻抵抗式 ELZONE 80SY-2 粒度分析儀分別 計測得其粒徑與粒子濃度之實態值。再區分粒徑範圍 3.54∼ 278 um 成 33 個區間,以及 粒子比重範圍 1.001 ∼ 3.00 成 30 個區間,以最末一個樣本中殘留的粒徑一粒子濃度之 粒度分佈值為基底,配合每個樣本中粒徑--比重關係的相對塵值,加入每相鄰兩個樣本內 同一群粒徑與比重區間中減少的粒度分佈值,累積至第一個樣本內減少量為止。如此,證實 可順利取得固形物的濃度、粒度分布、中位徑、最頻徑、比重範圍及成分組成等物性資料。 以上資料將可作為濾材及設施選擇、池水管理等工程與環境設計及評估用參考資料。 |
英文摘要 | From a view point of the aquccultural engineering, this study made a p article physical characteristics analysis model and a measured technique by using two flux relationships between the particle dropping velocity and its counting flux.Measured the size distribution and counting numbers、 its density range of mixed particle by particle weight & size, its dropping velocity, a measurment technique would be developed. The particles dropping patterns would be affected by a drag resistance (Cf) and its water Reynolds number (Re). An applied it for an Anguilla japonica pond to get a pond water column sample near the feeding position. We considered that Re was less than 300 in eel pond, maxium particle density was less than 3.0 and maxium size was less than 280 um in eel pond water, so that Weiselsberger's two formulas were used to design a dropping velocity testing tube.Sampling times were also decided. Seventeen times sampling from a dropping pipe were divided. Base to the counting-size distribution data of the last sample, every two near samples counting difference were added in the same particle density ranges and the same size ranges. So that the particles concentraton, counting distribution, median size、 mode size、 density range and those component analysis process, and it will be used to design some aquacultural equipments and to manage water environmental in any recycled system, like to choice the optimum filter media or to decide the filtration period. |
本系統中英文摘要資訊取自各篇刊載內容。