Modified correlation for minimum fluidization velocity of low-density particles in inverse liquid

Nelson, M., Srabet, S., Nan, T., Pjontek, D., & Zhu, J. (2022). Modified correlation for minimum fluidization velocity of low-density particles in inverse liquid–solid fluidized beds. Particuology, 71, 56-62. https://doi.org/10.1016/j.partic.2022.01.016

Modified correlation for minimum fluidization velocity of low-density particles in inverse liquid–solid fluidized beds

Michael Nelson ^{a b}, Saleh Srabet ^b, Tian Nan ^b, Dominic Pjontek ^b *, Jesse Zhu ^{a b *}

a Collaborative Innovation Center of Chemical Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, China
b Particle Technology Research Centre, Department of Chemical and Biochemical Engineering, Western University, Canada

10.1016/j.partic.2022.01.016

Volume 71, December 2022, Pages 56-62

Received 19 October 2021, Revised 3 January 2022, Accepted 12 January 2022, Available online 11 February 2022, Version of Record 25 February 2022.

E-mail: dpjontek@uwo.ca; jzhu@uwo.ca

Highlights

• Minimum fluidization velocity measurements in an inverse liquid–solid fluidized bed.

• Emphasis on small particles (d_p ≈ 1 mm) with densities lower than 300 kg/m³.

• Comparison of new and prior Umf data with common correlations.

• Novel Umf correlation proposed for low-density particles with low Ar number.

Abstract

The minimum fluidization velocity (U_mf) is a key parameter for the scale-up of inverse liquid–solid fluidized beds. Theoretical predictions using common correlations were compared against experimental minimum fluidization velocity measurements of low density (28–638 kg/m³), 0.80–1.13 mm Styrofoam particles in a fluidized bed with a height of 4.5 m and 0.2 m diameter. The average absolute relative deviation for the predicted minimum fluidization velocity for particles below 300 kg/m³ was above 40% using the studied common correlations. A modified Wen and Yu correlation was thus proposed based on novel and past measurements with low-density and small-diameter particles, expanding the range for predicting Umf. The new correlation predicted Umf with deviations below 15% for ST028, ST122 and ST300. This modified correlation also improved Umf predictions for comparable particles from a previous study, demonstrating its validity for a larger range of low-density particles.

Graphical abstract

Keywords

Liquid–solid fluidization; Inverse fluidization; Minimum fluidization velocity; Low-density particles

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