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relevant theory lab 5

# relevant theory lab 5 - b the bend’s loss coefficient...

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Relevant Theory When a fluid moves through a pipe system, certain properties of the pipes and pipe components can cause the fluid’s velocity and pressure to be altered. The pipe itself causes the fluid to experience friction, which causes the fluid to lose kinetic energy as the fluid travels throughout the pipes. The pipe components that cause energy losses include pipe bends, sudden area expansion and contraction, and valves. The energy loss due to friction applied to the fluid from the pipes is called major head loss, h LMajor , and the energy loss due to pipe components is called minor head loss, h LMinor . Together these losses make up head loss, h L. (1) h L = Total head loss h LMinor = Minor head loss h LMajor = Major head loss For this lab, the minor head loss due to pipe components will be considered, namely pipe bends and expansions and contractions. The head loss due to bends is a minor head loss and can be calculated through the use of Equation 2, where head loss is a function of the fluid’s entrance velocity, V, and K

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Unformatted text preview: b , the bend’s loss coefficient. Loss coefficients are unitless variables associated with head loss in pipe components. (2) h b = Head loss due to bend K b = Loss coefficient of a given bend V = Entrance velocity of fluid Sudden expansions and contractions encountered in pipe networks cause turbulence that create energy losses across the expansion or contraction. Head losses due to contraction can be calculated by using Equation 3. Head losses due to expansion can be estimated by equation 4. (3) h c = Head loss due to contraction K c = Loss coefficient of contraction Contraction energy losses are a function of the exit velocity, V 2 and the loss coefficient for contraction, K c . (4) h x = Head loss due to expansion Expansion energy losses are a function of entrance and exit velocity, V 1 and V 2 respectively....
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relevant theory lab 5 - b the bend’s loss coefficient...

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