minor-loss

# minor-loss - and the phenomenon is complicated To simplify...

This preview shows pages 1–2. Sign up to view the full content.

Losses in Pipe Flows Major Losses : due to friction, significant head loss is associated with the straight portions of pipe flows. This loss can be calculated using the Moody chart or Colebrook equation. Minor Losses : Additional components (valves, bends, tees, contractions, etc) in pipe flows also contribute to the total head loss of the system. Their contributions are generally termed minor losses. The head losses and pressure drops can be characterized by using the loss coefficient, K L , which is defined as One of the example of minor losses is the entrance flow loss. A typical flow pattern for flow entering a sharp-edged entrance is shown in the following page. A vena contracta region if formed at the inlet because the fluid can not turn a sharp corner. Flow separation and associated viscous effects will tend to decrease the flow energy

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: and the phenomenon is complicated. To simplify the analysis, a head loss and the associated loss coefficient are used in the extended Bernoulli’s equation to take into consideration of this effect as described in the next page. K h V g p p K V L L L V = = = 2 2 1 2 2 2 1 2 / , ∆ ∆ r r so that 1 2 0 3 7 2 51 f f D = -+ F H G I K J . log . . Re , e valid for nonlaminar range Minor Loss through flow entrance V 2 V 3 V 1 (1/2) ρ V 2 2 (1/2) ρ V 3 2 K L (1/2) ρ V 3 2 p → p ∞ gh K z z g K V V p p p g V K h z g V p h z g V p L L L L L + =-+ = ≈ = = = + + =-+ + ∞ 1 2 ) ( 2 ( 1 1 , , 2 , 2 2 : Equation s Bernoulli' Extended 3 1 3 1 3 1 2 3 3 2 3 3 1 2 1 1 g g gz V p r r + + 2 2...
View Full Document

## This note was uploaded on 11/27/2011 for the course EML 3002c taught by Professor Staff during the Fall '08 term at FSU.

### Page1 / 2

minor-loss - and the phenomenon is complicated To simplify...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online