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1) Laminar Flow

- À¯Ã¼ÀÔÀÚµéÀÌ ÃþÀ» ÀÌ·ç¾î Áú¼­ Á¤¿¬ÇÏ°Ô Ãþ°ú ÃþÀÌ ¼­·Î ¿øÈ°ÇÏ°Ô ¹Ì²ô·¯Áö¸é¼­ È帣´Â À¯µ¿
- Reynolds No. < 2000

2) Turbulent Flow

- À¯Ã¼ÀÔÀÚµéÀÌ ºÒ±ÔÄ¢ÇÑ °æ·Î¸¦ µû¶ó ȸÀüÇϸ鼭 ºÒ±ÔÄ¢ÇÏ°Ô È帣´Â À¯µ¿
- Reynolds No. > 4000

3) Reynolds No.

4) ºñ Áß ( SPECIFIC GRAVITY), SG

À¯Ã¼ÀÇ ¹Ðµµ ´ë Ç¥ÁØ »óÅÂÀÇ À¯Ã¼(¹°, °ø±â)ÀÇ ºñ
SG(gas) = ¥ñ(gas)/ ¥ñ(air) = ¥ñ(gas)/1.205 kg/§©
SG(liquid) = ¥ñ(liquid)/ ¥ñ(water) = ¥ñ(liquid)/998 kg/§©

5) Á¡ ¼º (VISCOSITY), ¥ñ

- À¯Ã¼ ÀÔÀÚ »çÀÌ¿¡ ¼­·Î »ó´ë¿îµ¿ÀÌ ÀϾ ¶§ »ó´ë¿îµ¿À» ¹æÇØÇÏ·Á´Â ¼ºÁú