NuclearApplications_web

NuclearApplications_web - Applications in Nuclear Systems...

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Unformatted text preview: Applications in Nuclear Systems April 19, 2011 Nuclear Application Topics I Variable properties and acceleration pressure loss I Computation of friction factors I Minor losses, including pressure loss at spacers In these slides (this course), assume single-phase conditions throughout. Variable Properties Primarily due to heating (change in temperature), water in a PWR does not have the same properties throughout the core. Typically, density decreases in the direction of flow by about 10%. As a result, both gravitational and frictional pressure loss are best estimated by an integral: P fric = Z L 2- L 2 ( z ) gdz (1) P fric = Z L 2- L 2 f ( z ) 1 D h ( z ) V ( z ) 2 2 dz (2) However, the product ( z ) V ( z ) is not a function of z . G = m / A . P fric = G 2 Z L 2- L 2 f ( z ) 1 2 ( z ) D h dz (3) Variable Properties (2) In a PWR, the system parameters can often be estimated by use of properties at the midplane. P fric = G 2 f mp L 2 mp D h dz (4) An additional term (acceleration pressure drop) must be considered in the case of variable properties. In general: p accel = out v 2 out- in v 2 in (5) Change in density, constant area p accel =...
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NuclearApplications_web - Applications in Nuclear Systems...

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