水下載具應用於海底管線檢修之關鍵技術研發---緊密固體顆粒在橫向流中之漂移與水下載具監測方法之研究

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(4) . The Study on the Drift of the Dense Solid Particles in the Cross Flow and the Method of Observation by Remotely Operated Vehicles .

(5) NSC 96-2221-E-006-328-MY3 96 8 1 99 7 31 .

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(9) . (Remote -controlled Operated Vehicle, ROV) . !"#$%&'()*+(Particle Image Velocimetry, PIV),()-.*+ (Particle Tracking Velocimetry, PTV)/01 2345678()129:4. ;<* HID =>?@9A8BC(). DEFGH9IJK()*,LMN O"PQR678(),STU. VW9XYZ,[\]^12" _`9abcdefghi. jklmnopqrs8tuv ),wU9x yz{PIJ_v. )",?|klL}9ghklrs 8~c9 J89a. b(s. ,IJ klnopq-.9 x?|lyz. {"VWU10,000"a b ? | l o P1.45. ¡9¢BC£y¤¥" pq v)¤¥¦§9L¨9©. ª«%#$¬]®¯°9±² ³´;9v)]µ¶·¸~}¹ ]º". MÊËÌ PTV9Íu9rs Abstract This research has developed a basic measuring technique for an image velocimetry system that can be installed on a Remote-control Operated Vehicle (ROV). The measuring technique would be applied to the underwater investigation using Particle Image Velocimetry (PIV) and Particle Tracking Velocimetry (PTV). High Intensive Discharge (HID) light source was adopted to illuminate the environment, and various CCD cameras were tested to compare their performance in an environment similar to real oceans. The statistics and image analysis was used to estimates the velocity of the tracer particle and the characteristics of the flow. Moreover, we studied the behavior of both single and multiple sphere solid particles with rock surface in cross flows, and developed an approximate predicting model for their settling at the bottom. The rough spheres have higher drag than smooth spheres in cross flows. So, in the process of calculation, Reynolds number up to 10,000, we consider gravity, buoyancy, added mass effect force and drag force to calculate the trajectory of single sphere solid particle with rock surface, and change the drag coefficient of smooth sphere to adjust the compute result. We found a 1.45 times of drag coefficient is needed. The effect of flow velocity variation, variation of the diameter of the glass sphere, and rotating all affect the trajectories and settling position. The prediction model matches most of the settlement experiments results with 95% confidence level.. Keywords: »pqx¼½¾,¿À cross flow. klz{©ª½¾¬H9abÁÂC ¿Àklz{vÃÄÅwU~Æ. s9¬¿Àklz{v)DÇ"y z{¢ÈÉ. ]¤¥". - III -. underwater. PTV,. sediment,.

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