To reduce debris fretting in a plant: If the flow holes in the bottom nozzle of

Question

To reduce debris fretting in a plant: If the flow holes in the bottom nozzle of each fuel assembly were made half as wide, much of the damaging debris would be filtered out by the nozzle. Obviously more holes would be required to keep the pressure drop across the nozzle the same. How many more? The nozzle plate is relatively thin, so entry and exit losses are the main losses. Entry head loss: hL =Kc [vi^2 /2g] where: Kc is the contraction loss coefficient and vi is the flow velocity inside the flow holes. K is a function of the ratio of flow areas inside and outside the holes: ai /ao =n*?*r^2 /A where: n is the number of holes, r is the radius of each hole, and A is the cross sectional area of the nozzle. ai/ao: 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 Kc: 0.362 0.338 0.308 0.267 0.221 0.164 0.105 0.053 0.015 Exit head loss: hl =[1? (ai /a o)]^2 * ( vi^2/2g)

Explanation / Answer

worldwidescience.org/.../a/assembly+bottom+nozzle.ht

Related Questions

Navigate

• Browse (All)
• Browse T
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.