Head loss coefficient

The head loss coefficient (Kexit) for the exit is expressed by [45]... 

Similar to the energy loss of flow gas in case of sudden changes as discussed in Section 3.4.4, various types of valves and fittings in the CVD vacuum pipehnes also produce a head loss, a so-called minor loss. As hsted in Table 3.6, the head loss (hj) associated with these parts and fittings can be expressed in terms of the head loss coefficient (K)... 

Table 3.6. Head loss coefficients for pipe components [46]...

Colebrook equation. The head-loss coefficients are obtained from tabulated engineering data. 

Head loss coefficient due to nonideal effects defined in Equation 9.25 (—) Head loss coefficient in Equation 9.36 (—)... 

Park et al. proposed a formula for the head-loss coefficient for circular piles as... 

In commercially available pipes, the dimension a of the section equals 10 cm, 20 cm, 30 cm, 40 cm, 50 cm, 60 cm, 70 cm, 80 cm, 90 cm, 1 m, etc. State the smallest value of a that allows for a flow rate greater than 1001/s. For this evaluation, the head loss associated with the valve can be omitted. Why is that For the different pipe diameters considered, comment upon the obtained variations in the regular head loss coefficient. 

The energy for mixing comes mainly from the higher flow velocity in the side tee. Becanse there is a higher flow velocity, there must be a higher pressure to drive the side stream. This pressure loss is typically defined in terms of velocity head loss and depends on the design of the nozzle, which sets the head loss coefficient. 

Axial blanket lengths must be chosen prior to the hydraulic calculations to establish the total fuel-element length. The axial blankets are sized primarily from economic studies performed at the core system level. Pressure loss across the fuel-element bundle is next calculated for the reference flow rate using empirical head-loss coefficients. Over the relevant range of Reynolds numbers, liquid-metal velocity profiles and pressure drops agree with those calculated from generalized correlations developed... 

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