The influence of particle thermal time constants on convection coefficients in bubbling fluidized beds

Brown, Robert C.; Overmann, Scott P.

doi:10.1016/s0032-5910(97)03407-4

Cited by 14 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…with equal to 0.1 to 0.2 sv . In the packet renewal models (e.g., [6,22,23]), the thermal conductivity at minimum fluidization is recognized as basis of the heat transfer resistance.…”

Section: The Contact Resistance In Heat Transfer Modellingmentioning

confidence: 99%

Wall-to-Bed Heat Transfer at Minimum Gas-Solid Fluidization

Zhang

Degrève

Baeyens

et al. 2014

Journal of Powder Technology

View full text Add to dashboard Cite

The heat transfer from a fluidized bed to the cooling jacket of the vessel has been studied for various powders at minimum fluidization conditions, by both convection and conduction approaches. These heat transfer characteristics are important as the point of transition between packed and fluidized bed operations and are needed in designing heat transfer operations where bubble-flow is not permitted. The effective thermal conductivity of the emulsion moreover determines the contact resistance at the heating or cooling surface, as used in packet renewal models to predict the wall-to-bed heat transfer. In expressing the overall heat transfer phenomenon as a convective heat transfer coefficient, it was found that the results could be fitted byNumf,j=0.01Ar0.42.

show abstract

“…with equal to 0.1 to 0.2 sv . In the packet renewal models (e.g., [6,22,23]), the thermal conductivity at minimum fluidization is recognized as basis of the heat transfer resistance.…”

Section: The Contact Resistance In Heat Transfer Modellingmentioning

confidence: 99%

Wall-to-Bed Heat Transfer at Minimum Gas-Solid Fluidization

Zhang

Degrève

Baeyens

et al. 2014

Journal of Powder Technology

View full text Add to dashboard Cite

show abstract

“…The heat transfer in a fluidized bed is a wide topic. It usually includes several sub-processes: heat transfer between solid particles and fluidizing medium, which includes heat transfer between the gas and solid particles in emulsion phase and heat transfer between bubbles and solid particles; heat transfer between the bed and the surfaces (walls or immersed surfaces); and heat transfer inside the solid particles [6,7]. Computational fluid dynamic models and other numerical models of fluidized bed combustors encompass a great deal of simplifications from experimental setups and bed material characteristics, especially when the experiments deal with irregular particles such as biomass particles [8].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer process in gas–solid fluidized bed combustors: A review

Abdelmotalib

Youssef

Ali

et al. 2015

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

“…Experimental and theoretical studies have demonstrated that convection coefficients in fluidized beds are dependent on the energy storage capacity of fluidized particles [41][42][43]. For this reason, an encapsulated PCM in granular form is expected to enhance the heat transfer rate due to its ability to store large quantities of energy in latent form.…”

mentioning

confidence: 99%

Modeling the Heat Transfer Coefficient Between a Surface and Fixed and Fluidized Beds With Phase Change Material

Izquierdo-Barrientos

Sobrino

Almendros-Ibáñez

2016

Journal of Heat Transfer

View full text Add to dashboard Cite

The objective of this work is to model the heat transfer coefficient between an immersed surface and fixed and bubbling fluidized beds of granular phase change material (PCM). The model consists of a two-region model with two different voidages in which steady and transient conduction problems are solved for the fixed and fluidized bed cases, respectively. The model is validated with experimental data obtained under fixed and fluidized conditions for sand, a common material used in fixed and fluidized beds for sensible heat storage, and for a granular PCM with a phase change temperature of approximately 50 °C. The superficial gas velocity is varied to quantify its influence on the convective heat transfer coefficient for both the materials. The model proposed for the PCM properly predicts the experimental results, except for high flow rates, which cause the contact times between the surface and particles to be very small and lead the model to overpredict the results.

show abstract

The influence of particle thermal time constants on convection coefficients in bubbling fluidized beds

Cited by 14 publications

References 7 publications

Wall-to-Bed Heat Transfer at Minimum Gas-Solid Fluidization

Wall-to-Bed Heat Transfer at Minimum Gas-Solid Fluidization

Heat transfer process in gas–solid fluidized bed combustors: A review

Modeling the Heat Transfer Coefficient Between a Surface and Fixed and Fluidized Beds With Phase Change Material

Contact Info

Product

Resources

About