On the design of conical hoppers for spent coffee grounds : Moisture content and particle-size effects - Archive ouverte HAL Access content directly
Journal Articles Journal of Food Engineering Year : 2021

On the design of conical hoppers for spent coffee grounds : Moisture content and particle-size effects

(1, 2) , (3) , (3) , (2)
1
2
3

Abstract

Spent coffee ground (SCG) is a food waste with promising potential for reuse in pilot-to-industrial scale processes provided that storage and handling issues are overcome. Here some key bulk and flow properties of SCGs were determined with FT4 rheometer, for powders with different particle-size distribution (249.1 ≤ dV ≤ 583.1 μm) and moisture content (2.8% ≤ MC ≤ 62.5%). These properties were used to evaluate the design of mass-flow silo hoppers following the classical Jenike theory. The SCGs flowability worsened by decreasing dV and increasing MC, with indexes between 1.09 ≤ HR ≤ 1.92 and 2.5 ≤ FF ≤ 15.0. The minimum hopper inclination and outlet diameter ranged from 9.9° to 17.1° and 0.40–1.00 m. A sensitivity analysis for the hopper design was performed, and a densification equation was coupled to Jenike's method to ease future hopper designs for SCGs with different properties. Ultimately, the results showed that careful consideration must be given to dV and MC to design effective devices to handle SCGs.
Embargoed file
Embargoed file
0 0 16
Year Month Jours
Avant la publication

Dates and versions

hal-03150765 , version 1 (24-02-2021)

Identifiers

Cite

L. Massaro Sousa, C.G. G Schulz, R. Condotta, M.C. C Ferreira. On the design of conical hoppers for spent coffee grounds : Moisture content and particle-size effects. Journal of Food Engineering, 2021, 300, pp.110537. ⟨10.1016/j.jfoodeng.2021.110537⟩. ⟨hal-03150765⟩

Collections

IFP
284 View
55 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More