## Abstract

A cold mockup of a nuclear particle spouted bed coater is systematically studied over an experimental matrix of four particle radii, three cone angles, several gas (humidified air) flow rates, and four particle inventories. Spherical ZrO _{2} particles of 300, 400, 500 and 650μm with a tight distributed size are selected as surrogates for nuclear fuel particles due to their similar physical properties. Three spouted beds with 45, 60, and 75-degree cone angles are used. The gas flow rate spans the fully spouted condition to minimum spouted condition. The bed inventories are H/D _{c} of 0.50, 0.55, 0.60 and 0.65. The column diameter is 5 cm with an inlet throat diameter of 0.04 cm. The U _{mf} measurements closely follow the Wen and Yue correlation. Due to the high density of our particles a new U _{ms} correlation is needed. Our dimensionless Ums correlation for ZrO2 particles is presented as a function of Re number at U _{ms}, particle size (D _{p}), cone angle of the spouted bed (γ) and static particle height (H _{0}/D _{c}). A new quantitative method for U _{ms} evaluation is presented. Another dimensionless correlation for average pressure drop across the spouted bed covering the experimental matrix is given in terms of U/U _{ms}, γ, H _{0}/D _{c}, and D _{p}/D _{c}. The first four moments and the power spectral density of the pressure time series are calculated with trends described. The main frequency peak of the pressure drop signal shifts from a high to a low value as the air velocity drops from fully spouted velocity to near minimum spouting velocity. As the air flow rate is lowered to 1.1-1.2 U _{ms}, the main frequency peak increases sharply. Main frequency peak of the pressure signal increases as particle size, static particle height or cone angle increase. The 0.5mm particles have the sharpest main frequency peak plot while the other plots become wider as D _{p} increases or decreases. The standard deviation of the pressure signal for the 0.3mm, 0.4mm and 0.65mm particles tend to increase as gas flow rate is lowered to U _{ms} while that of the 0.5mm particles tends to decreases. The skewness also increases as gas flow rate is lowered to U _{ms} except for 0.65mm particles. In general, the kurtosis also increases as gas flow rate approaches U _{ms}.

Original language | English |
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Pages | 2867-2885 |

Number of pages | 19 |

State | Published - 2005 |

Event | 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase - Cincinnati, OH, United States Duration: Oct 30 2005 → Nov 4 2005 |

### Conference

Conference | 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase |
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Country/Territory | United States |

City | Cincinnati, OH |

Period | 10/30/05 → 11/4/05 |