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Çѱ¹¼öÀÚ¿øÇÐȸ / v.34, no.6, 2001³â, pp.745-751
¿µ»óÇØ¼® ±â¹ýÀ» ÀÌ¿ëÇÑ ³­·ù È帧 Áß Ä§°­¼ÓµµÀÇ ÃøÁ¤
( Fall Velocity Measurement in the Turbulent Flow Using Image Analysis Method )
À±»óÈÆ;À¯±Ç±Ô;À±º´¸¸; ¸íÁö´ëÇб³ ´ëÇпø Åä¸ñ°øÇаú;The Univ. of Iowa Åä¸ñȯ°æ°øÇаú;¸íÁö´ëÇб³ °ø°ú´ëÇÐ SOC°øÇкÎ;
 
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º» ¿¬±¸¿¡¼­´Â ³­·ù È帧 Áß¿¡¼­ ¸ð·¡ÀÇ Ä§°­¼Óµµ¸¦ PTV¸¦ ÀÌ¿ëÇÏ¿© ÃøÁ¤ÇÏ¿´´Ù. PTV´Â ¿µ»óÇØ¼®±â¹ýÀ» ÀÌ¿ëÇÏ¿© ÀÔÀÚ¸¦ ÃßÀûÇÏ´Â ¹æ¹ýÀ¸·Î È帧 ÁßÀÇ Ä§°­¼Óµµ¸¦ ÃøÁ¤ÇÒ ¼ö ÀÖ´Â À¯ÀÏÇÑ ¹æ¹ýÀ̶ó ÆÇ´ÜµÈ´Ù. ½ÇÇèÀº È帧ÀÌ ¾ø´Â °æ¿ì¿Í È帧ÀÌ ÀÖ´Â °æ¿ì·Î ³ª´©¾î ½Ç½ÃÇÏ¿´´Ù. È帧ÀÌ ¾ø´Â °æ¿ì¿¡ PTV·Î ÃøÁ¤ÇÑ Ä§°­¼Óµµ¸¦ ±âÁ¸¹®Çå°ú ºñ±³ÇÑ °á°ú Àß ÀÏÄ¡ÇÏ¿© ±â¹ýÀÇ Å¸´ç¼ºÀ» ÀÔÁõÇÏ¿´´Ù. È帧ÀÌ ÀÖ´Â °æ¿ì¿¡´Â À¯¼ÓÀÌ Áõ°¡ÇÔ¿¡ µû¶ó ħ°­¼Óµµ°¡ °¨¼ÒÇÏ´Â °ÍÀ¸·Î ¹àÇôÁ³´Ù. ÀÌ´Â À¯¼ÓÀÌ Áõ°¡ÇÔ¿¡ µû¶ó ³­·ù°­µµ°¡ Áõ°¡ÇÏ¿© ³­·ù°­µµ°¡ ħ°­¼ÓµµÀÇ °¨¼Ò¿¡ ¿µÇâÀ» ºñÄ¡´Â °ÍÀ¸·Î ÆÇ´ÜµÈ´Ù. ³­·ù°­µµ¿Í ħ°­¼ÓµµÀÇ °ü°è¸¦ ºÐ¼®ÇÑ °á°ú ¸¶Âû¼Óµµ·Î ¹«Â÷¿øÈ­µÈ ħ°­¼Óµµ´Â Á¤ÁöÀ¯Ã¼ÁßÀ϶§¿¡ ºñÇØ ¾à 40% °¨¼ÒµÊÀ» ¾Ë ¼ö ÀÖ¾ú´Ù.
Fall velocities of sand particles in the turbulent flow are analyzed through measurements using PTV. PTV is believed to be the only instrument to measure the fall velocity in the turbulent flow, since it can trace the individual particle. The method is verified by comparison with existing formula for still-water case. The experimental results show that the fall velocity in the turbulent flow decreases compared with that in still water, and decreases by 40% as the turbulent intensity normalized by the friction velocity increases upto 1.
 
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ħ°­¼Óµµ;³­·ù°­µµ;PTV;fall velocity;turbulence intensity;PTV;
 
Çѱ¹¼öÀÚ¿øÇÐȸ³í¹®Áý / v.34, no.6, 2001³â, pp.745-751
Çѱ¹¼öÀÚ¿øÇÐȸ
ISSN : 1226-6280
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200111920878006)
¾ð¾î : Çѱ¹¾î
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