Friction factor¸¦ °è»êÇÏ¿© ½ÇÁ¦ ¹è°üÀÇ ¾Ð·Â¼Õ½Ç¿¡ Àû¿ëÇØ º¸¾Ò½À´Ï´Ù¸¸,
°è»ê°ª°ú Ã¥ÀÚ(Chemical Engineering 1978,8,14)ÀÇ °ªÀÌ ³Ê¹« ´Ù¸¨´Ï´Ù.
¹«¾ùÀÌ À߸øµÇ¾úÀ»°¡¿ä.?
- Ã¥ÀÚ³»¿ë - (½ºÄµÇÏ¿© ÆÄÀϷΠ÷ºÎÇÏ¿´½À´Ï´Ù.)
1.Inside Diameter = 4.026 in
2.Flow rate = 137500 lb/hr
3.Temperature in = 490 F
4.Temperature out = 580 F
5.Mass velocity = 432 lb/s.ft2
6.Roughness, e = 0.00004572 m = 0.00015 ft
7.Avg. Specific Volume = 0.0194 ft3/lb
8.Viscosity avg. = 0.581 cP
9.Equivalent length, Le = 1131 ft
À§ÀÇ °ªÀ» °¡Áö°í Pressure dropÀ» ±¸Çϴµ¥, Ã¥ÀÚÀÇ Ç®ÀÌ´Â ´ÙÀ½°ú °°½À´Ï´Ù.
@Reynolds number = (4.026*1,555,200)/(12*0.581) = 898,000 <--- "1,555,200" ¾îµð¼ ³ª¿Â°ª?
@Fanning Friction factor = 0.0038 <--- Á¦°¡ °è»ê½ÄÀ¸·Î °è»êÇغ» °ªÀº 0.004223 ÀÔ´Ï´Ù.
@DP = (0.00517) x (0.0038) x (432)^2 x (0.0194) x (1131)
(4.026)
= 20.0 psi
½Ã°£µÇ½Ç ¶§ ÇÑ ¹ø üũÁ» ºÎŹµå¸®°Ú½À´Ï´Ù. ÷ºÎÆÄÀÏ·Î Çѹøº¸½Ã±¸¿ä.
¾Ë·ÁÁֽŠ¹æ¹ýÀ¸·Î ±¸ÇÑ Fanning friction factor°ª°ú ¸¹ÀÌ Â÷ÀÌ°¡ ³ª´Â°Í °°½À´Ï´Ù.
¿©·¯¹ø ¹ø°Å·´°ÔÇصå·Á Á˼ÛÇÕ´Ï´Ù.