Characteristics of heat transfer in two-dimensional spouted bed

Influence of contactor geometry and draft tube configuration on the cycle time distribution in sawdust conical spouted beds

“…Thus, recent applications are those involving physical processes, as are: drying of seeds, pharmaceutical Page 3 of 42 A c c e p t e d M a n u s c r i p t 3 powders and biomaterials (Devahastin et al, 1998, Konopka et al, 2008, Markowski et al, 2010, drying of sawdust (Berghel et al, 2008), granulation (Borini et al, 2009), coating (Rocha et al, 2009), heat carrier (Prachayawarakorn et al, 2006) and solid mixing (Hao et al, 2008). The applications in chemical processes include gasification (Spiegl et al, 2010), combustion (Lim et al, 1988, Konduri et al, 1999, Rasul, 2001, San José et al, 2014 and pyrolysis (Aguado et al, 2000a, Aguado et al, 2000b, Elordi et al, 2009, Artetxe et al, 2010 Different modifications of the original spouted bed have been proposed in the literature with the aim of improving performance.…”

Hydrodynamic characteristics of a pulsed spouted bed of food particulates

“…Due to many shortcomings and limitations of a conventional spouted bed (CSB), however, a number of research works have been devoted to the study of modified spouted beds, both in terms of their hydrodynamic and heat/mass transfer (especially drying) behavior. These include studies of two-dimensional spouted beds (Kalwar et al, 1992;Passos et al, 1993;Prachayawarakorn et al, 2006), which can be scaled up easier than a conventional spouted bed; multiple spouted beds (Wang and Wei, 1999;Ren et al, 2010), which give higher circulation velocity of solids comparing with a conventional spouted bed at the same unit size; annular spouted beds (Hao et al, 2008;Guoxin et al, 2008), which present higher gas-solid heat transfer rate than a conventional spouted bed; draft-tube spouted beds (Freitas and Freire, 2001;Marmo, 2007), which provide more uniform particle residence time and exhibit lower pressure drops than a conventional spouted bed; jet spouted beds (Tia et al, 1995;Shuhama et al, 2003;Devahastin et al, 2006), which have been developed for very large, irregularly shaped and difficult-to-spout particulates and for drying of liquid slurries via the use of inert particles; rotating jet spouted bed (RJSB) and rotating jet annular spouted bed (RJASB) (Jumah et al, 1996;Devahastin et al, 1999), which can minimize the energy consumption during drying of large particles in the falling rate period.…”

Management of Surface Drying Temperature to Increase Antioxidant Capacity of Thyme Leaf Extracts (Thymus vulgarisL.)

“…This is an added difficult to compare the values obtained with values found in the literature. Nevertheless, the average values of the mass and heat transfer coefficient showed in table 4 are of the order of magnitude of the values reported in several works [38][39][40][41] .…”

“…Therefore, under these operating conditions (80 ºC) it is important to manage the evolution of the sample surface temperature to avoid antioxidant capacity losses. In addition to the velocity and the temperature, the geometric ratio (height of the bed/particle size) has an effect on the heat and mass transfer coefficients [38] . This is an added difficult to compare the values obtained with values found in the literature.…”