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baduki78
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: baduki78
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: 07-08-29 11:03
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: 11899
°üÀÇ size¸¦ 3/4"¿¡¼ 1/4"·Î Reducing µÇ´Â °üÀ» »ç¿ëÇÏ´Ù°¡
3/4" ¿¡¼ 3/8" º¯°æÇÒ °æ¿ì À¯·®ÀÇ º¯È¸¦ ¾Ë°í ½Í½À´Ï´Ù.
±âÁ¸ 1/4" °ü¿¡¼ÀÇ À¯·®Àº ÃøÁ¤Çغ» °á°ú 1/90 Gallon/secÀ̾ú½À´Ï´Ù.
3/4" Line ¿¡¼ÀÇ ¾Ð·ÂÀº 2KG Á¤µµ À̱¸¿ä.
°è»êÀÌ °¡´ÉÇÑ°¡¿ä???
½ºÅ×Æijë
Stefano
07-08-29 12:50
(1) °ü³» À¯Ã¼(¾×ü, ±âü)È帧¿¡¼ ¾Ð·Â¼Õ½Ç(¥ÄP)°ú Á÷°æ(d),À¯¼Ó(v),±æÀÌ(L)¿ÍÀÇ ÀϹÝÀûÀÎ °ü°è½ÄÀº ´ÙÀ½°ú °°½À´Ï´Ù.
(´ÜÀ§´Â ¸ðµÎ SI´ÜÀ§·Î ÅëÀÏ)
Head ¼Õ½Ç: (¥ÄP/¥ñ) = f (L/d) (v^2/2) .....................Darcy's Formula......(1) f=Darcy's(Moody's) Friction Factor
À¯¼Ó: v=[(2¥ÄP/¥ñ)/(f (L/d)]^0.5.........................................................(2)
¸¶Âû°è¼ö: f = Function of (Re, e), Re = ¥ñ d v/¥ì, e=surface absolute roughness............(3) f:¸¶Âû°è¼ö µµÇ¥¿¡¼ ãÀ½
ºÎÇÇÀ¯·®: q=(¥ðd^2/4)*v = (¥ðd^2/4) * [(2¥ÄP/¥ñ)/(f(L/d)]^0.5.........................................(4)
(2) Laminar FlowÀÎ °æ¿ì¿¡´Â
1/4" °ü°ú 3/8" °ü ³»ÀÇ È帧ÀÌ ¸ðµÎLaminar FlowÀÎ °æ¿ì¿¡´Â °ü³» ¸¶Âû°è¼ö´Â °ü³»ÀÇ °ÅÄ¥±â¿Í´Â »ó°üÀÌ ¾ø°í Reynolds Number¸¸ÀÇ ÇÔ¼ö°¡ µË´Ï´Ù. µû¶ó¼ (3)½ÄÀº
f = 64/Re = 64/(¥ñ d v/¥ì)..................................................(5)
µÎ°³ÀÇ °ü°æ d1, d2¿¡¼ÀÇ À¯·®ÀÇ ºñ±³: °°Àº À¯Ã¼À̹ǷΠ¹Ðµµ¿Í Á¡µµ´Â °°½À´Ï´Ù.
(4)½Ä¿¡¼ÀÇ °üÀÇ ±æÀÌ¿Í ¾çÂÊ ³¡¿¡¼ÀÇ ¾Ð·ÂÂ÷´Â ¼·Î °°´Ù°í º¸°í, Laminar Flow·Î °£ÁÖÇßÀ¸¹Ç·Î (5)½Äµµ ÀÌ¿ëÇÕ´Ï´Ù..
q2/q1 = (d2/d1)^2*[f1/f2]^0.5 *[d2/d1]^0.5, ................(6)
¿©±â¼ [f1/f2] = (Re2)/(Re1) = (q2/d2)/(q1/d1)=(d1/d2)*(q2/q1).....(7)..Laminar FlowÀÎ °æ¿ì¿¡¸¸ Àû¿ë
µû¶ó¼ q2/q1 = (d2/d1)^2*[(d1/d2)]^0.5 *[q2/q1]^0.5*(d2/d1)^0.5 = (d2/d1)^2*(q2/q1)
(q2/q1) = (d2/d1)^4.......................................................(6a)..Laminar FlowÀÎ °æ¿ì¿¡¸¸ Àû¿ë
À§ÀÇ (6)½ÄÀÇ °á·ÐÀº... "Laminar Flow ¿µ¿ª¿¡¼ÀÇ À¯·®Àº Á÷°æÀÇ 4½Â¿¡ ºñ·ÊÇÑ´Ù"¸¦ ¸»ÇÏ°í ÀÖ½À´Ï´Ù.
(3) Laminar ȤÀº Turbulent FlowÀÇ °æ¿ì:
1/4" °ü°ú 3/8"°ü³»ÀÇ È帧ÀÌ ¸ðµÎ LaminarÀÎ °æ¿ì (2)ÀÇ ¹æ¹ýÀ¸·Î °è»êÇÏ¸é µÇÁö¸¸ À̵éÀÇ Á¶ÇÕÀ̰ųª ¸ðµÎ Turbulent FlowÀÎ °æ¿ì¿¡´Â (7)½ÄÀ̳ª (6a)½ÄÀ» Àû¿ëÇÒ ¼ö ¾øÀ¸¹Ç·Î (6)½ÄÀÇ ¸¶Âû°è¼ö, f1,f2¸¦ °¢°¢ °è»êÇؼ À¯·®ºñ¸¦ °è»êÇϼ¼¿ä.
q2/q1 = (d2/d1)^2.5*[f1/f2]^0.5 .....................................(6), f1,f2.. Function of (Re, e),
(4) PipeÀÇ °æ¿ì ȣĪ°æ°ú ½ÇÁ¦ ³»°æÀº Â÷ÀÌ°¡ ÀÖ°í °°Àº ȣĪ°æÀ̶ó°í Çصµ °üÀÇ µÎ²²¿¡ µû¶ó ³»°æÀÌ Å©°Ô ´Þ¶óÁö¹Ç·Î ½ÇÁ¦ ³»°æÀ» ¾Ë¾Æº¸°ú °è»êÇØ¾ß ÇÕ´Ï´Ù. TubeÀÎ °æ¿ì¿¡µµ ȣĪ°æÀº ¿Ü°æ°ú °°Áö¸¸ °üÀÇ µÎ²²µû¶ó ³»°æÀÌ ´Þ¶óÁý´Ï´Ù.
ÇÊÀÚÀÇ µµ¿òÀ» ¹Þ¾Ò´Ù°í »ý°¢µÇ½Ã¸é ½ÇÁ¦·Î °è»êÇØ º¸½Ã°í °á°ú¸¦ ´ä±Û·Î "²À"¿Ã·ÁÁֽñ⠹ٶø´Ï´Ù.
(1) °ü³» À¯Ã¼(¾×ü, ±âü)È帧¿¡¼ ¾Ð·Â¼Õ½Ç(¥ÄP)°ú Á÷°æ(d),À¯¼Ó(v),±æÀÌ(L)¿ÍÀÇ ÀϹÝÀûÀÎ °ü°è½ÄÀº ´ÙÀ½°ú °°½À´Ï´Ù. (´ÜÀ§´Â ¸ðµÎ SI´ÜÀ§·Î ÅëÀÏ) Head ¼Õ½Ç: (¥ÄP/¥ñ) = f (L/d) (v^2/2) .....................Darcy's Formula......(1) f=Darcy's(Moody's) Friction Factor À¯¼Ó: v=[(2¥ÄP/¥ñ)/(f (L/d)]^0.5.........................................................(2) ¸¶Âû°è¼ö: f = Function of (Re, e), Re = ¥ñ d v/¥ì, e=surface absolute roughness............(3) f:¸¶Âû°è¼ö µµÇ¥¿¡¼ ãÀ½ ºÎÇÇÀ¯·®: q=(¥ðd^2/4)*v = (¥ðd^2/4) * [(2¥ÄP/¥ñ)/(f(L/d)]^0.5.........................................(4) (2) Laminar FlowÀÎ °æ¿ì¿¡´Â 1/4" °ü°ú 3/8" °ü ³»ÀÇ È帧ÀÌ ¸ðµÎLaminar FlowÀÎ °æ¿ì¿¡´Â °ü³» ¸¶Âû°è¼ö´Â °ü³»ÀÇ °ÅÄ¥±â¿Í´Â »ó°üÀÌ ¾ø°í Reynolds Number¸¸ÀÇ ÇÔ¼ö°¡ µË´Ï´Ù. µû¶ó¼ (3)½ÄÀº f = 64/Re = 64/(¥ñ d v/¥ì)..................................................(5) µÎ°³ÀÇ °ü°æ d1, d2¿¡¼ÀÇ À¯·®ÀÇ ºñ±³: °°Àº À¯Ã¼À̹ǷΠ¹Ðµµ¿Í Á¡µµ´Â °°½À´Ï´Ù. (4)½Ä¿¡¼ÀÇ °üÀÇ ±æÀÌ¿Í ¾çÂÊ ³¡¿¡¼ÀÇ ¾Ð·ÂÂ÷´Â ¼·Î °°´Ù°í º¸°í, Laminar Flow·Î °£ÁÖÇßÀ¸¹Ç·Î (5)½Äµµ ÀÌ¿ëÇÕ´Ï´Ù.. q2/q1 = (d2/d1)^2*[f1/f2]^0.5 *[d2/d1]^0.5, ................(6) ¿©±â¼ [f1/f2] = (Re2)/(Re1) = (q2/d2)/(q1/d1)=(d1/d2)*(q2/q1).....(7)..Laminar FlowÀÎ °æ¿ì¿¡¸¸ Àû¿ë µû¶ó¼ q2/q1 = (d2/d1)^2*[(d1/d2)]^0.5 *[q2/q1]^0.5*(d2/d1)^0.5 = (d2/d1)^2*(q2/q1) (q2/q1) = (d2/d1)^4.......................................................(6a)..Laminar FlowÀÎ °æ¿ì¿¡¸¸ Àû¿ë À§ÀÇ (6)½ÄÀÇ °á·ÐÀº... "Laminar Flow ¿µ¿ª¿¡¼ÀÇ À¯·®Àº Á÷°æÀÇ 4½Â¿¡ ºñ·ÊÇÑ´Ù"¸¦ ¸»ÇÏ°í ÀÖ½À´Ï´Ù. (3) Laminar ȤÀº Turbulent FlowÀÇ °æ¿ì: 1/4" °ü°ú 3/8"°ü³»ÀÇ È帧ÀÌ ¸ðµÎ LaminarÀÎ °æ¿ì (2)ÀÇ ¹æ¹ýÀ¸·Î °è»êÇÏ¸é µÇÁö¸¸ À̵éÀÇ Á¶ÇÕÀ̰ųª ¸ðµÎ Turbulent FlowÀÎ °æ¿ì¿¡´Â (7)½ÄÀ̳ª (6a)½ÄÀ» Àû¿ëÇÒ ¼ö ¾øÀ¸¹Ç·Î (6)½ÄÀÇ ¸¶Âû°è¼ö, f1,f2¸¦ °¢°¢ °è»êÇؼ À¯·®ºñ¸¦ °è»êÇϼ¼¿ä. q2/q1 = (d2/d1)^2.5*[f1/f2]^0.5 .....................................(6), f1,f2.. Function of (Re, e), (4) PipeÀÇ °æ¿ì ȣĪ°æ°ú ½ÇÁ¦ ³»°æÀº Â÷ÀÌ°¡ ÀÖ°í °°Àº ȣĪ°æÀ̶ó°í Çصµ °üÀÇ µÎ²²¿¡ µû¶ó ³»°æÀÌ Å©°Ô ´Þ¶óÁö¹Ç·Î ½ÇÁ¦ ³»°æÀ» ¾Ë¾Æº¸°ú °è»êÇØ¾ß ÇÕ´Ï´Ù. TubeÀÎ °æ¿ì¿¡µµ ȣĪ°æÀº ¿Ü°æ°ú °°Áö¸¸ °üÀÇ µÎ²²µû¶ó ³»°æÀÌ ´Þ¶óÁý´Ï´Ù. ÇÊÀÚÀÇ µµ¿òÀ» ¹Þ¾Ò´Ù°í »ý°¢µÇ½Ã¸é ½ÇÁ¦·Î °è»êÇØ º¸½Ã°í °á°ú¸¦ ´ä±Û·Î "²À"¿Ã·ÁÁֽñ⠹ٶø´Ï´Ù.
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