Numerical prediction of collection efficiency for a cyclone separator without barrel part

---

Osama Hamdy, Magdy A Bassily, Hesham M El-Batsh and Tarek A Mekhail

Upper Egypt Flour Mills Co. Sohag, Egypt
Minia University, Egypt
Benha University, Egypt
Aswan University, Egypt

:

Abstract

---

Statement of the Problem: Cyclone separators are commonly used as a part of pneumatic transporting systems for the purpose of separating particles transported from air. A new cyclone separator design without barrel part has been studied numerically to predict its collection efficiency. The new cyclone design was modified by introducing the tangential inlet into the cone part directly, while the cone length (lc) was increased to cover the absence of barrel length (ld) with the same cone angle (αc =constant). As a result the contraction ratio (Dx/D), which is defined as the ratio between the vortex finder diameter and the cone diameter, was decreased. Numerical Procedure: The Reynolds stress model (RSM) and the discrete phase model were used to predict the gas flow field and the dispersed phase inside the cyclone respectively. The model was validated by comparing the numerical results with published experimental data. Findings: Results show that the collection efficiency of the new design is significantly increased as a result of increasing the tangential velocity due to decreasing of contraction ratio, but also the pressure drop increases. The calculated data was used to derive a new correlation for Stk50 in terms of Re and dimensionless geometrical parameter Dx/D to help predicting the cut-off size, d50. Also, a cyclone performance map was performed through dimensionless quantities relationship (Eu Vs. Stk50) for cyclones without barrel part for different values of Dx/D. Conclusion: The collection efficiency has been enhanced by introducing a new cyclone separator design without barrel part. This could help protect the surrounding environment from small particles that came out with air transporting systems but also the energy consumption increases due to increasing pressure drop.

Biography

---

Email: osama_hamdy84@yahoo.com