, (), , , :
. (2.1)
, , . , , .
ij , , ,
. (2.2)
, , . . ó .
. (2.3)
̳ , 2- .4, .
.
1) г- (Reader-Harris) (Gallagher). ISO 5167-2:2003, 8.586.2-2009 :
, (2.4)
; ; (2.5)
. (2.6)
.
2) ISA 1932 ( 8.586.3-2009)
. (2.7)
3) ( 8.586.4-2009):
- ( ) :
= 0,991-0,0014×106/Re 4×104 £ Re < 2 105 ; (2.8)
= 0,984 Re ³ 2×105. (2.9)
- :
= 1,009 4×104 ×b £ Re < 5×105 ×b; (2.10)
= 0,9950 5×105 ×b £ Re £106 b; (2.11)
= 1,000 106 ×b <Re £ 2× 106 b; (2.12)
= 1,010 2×106 ×b < Re £ 108 b. (2.13)
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