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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Design of a Combined Propeller and Venturi Tube System for Aquaculture Ponds) ผู้เขียน: ดร.สันติ ลักษิตานนท์, รองศาสตราจารย์ ,  Gajendra Singh สื่อสิ่งพิมพ์:pdf AbstractThe main objective of the study was to design and develop an aerator (a combined propeller and venturi tube system) and to evaluate its performance characteristics and oxygenating capacity. This system has certain advantages over existing methods of separate water circulation and oxygenation methods. The aerator was designed to perform two functions: circulation, and aeration. A large diameter propeller (0.45 m) rotating at a low speed (60 rpm), to move a large volume of water (0.093 m3/s), was aimed for circulation. The rotational speed was kept low enough to produce gentle water movement without disturbing or eroding the bottom soil. For oxygenation, a venturi tube was installed horizontally at the center of the propeller, at a depth of 0.5 m below water surface (1.0 m pond depth). The oxygenating experiments were conducted using accepted protocols for various operating parameters. The mixing of fine bubbles and strong current, accomplished by the rotating propeller, quickly transported the dissolved oxygen (DO) to a greater depth. The highest value of standard oxygen-transfer rate (SOTR) of the aerator tests in the range of scope and limitation was found to be 0.78 kg O2/h, which is higher than other existing aerators, i.e. the paddle wheel aerators and propeller-aspiration-pump aerators. A dimensional analysis was conducted to find the relationship between the dependent variable, SOTR, and the independent variable in the form of PQ/V2, where P is pressure inside venturi tube, V is water velocity, and Q is volumetric flow rate of water. The results show that the two variables have a linear relationship with R2 = 0.93. |
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 Researcherนาย ปณิธาน แก้วจันทวีที่ทำงาน:สถานีวิจัยประมงสมุทรสงคราม (ศูนย์บริหารงานวิจัยเเละสนับสนุนวิชาการ คณะประมง) คณะประมง สาขาที่สนใจ:การเพาะเลี้ยงสัตว์น้ำจืด, การเพาะเลี้ยงสัตว์น้ำชายฝั่ง Resume |
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