Dynamics of unary and binary gas-solid flows

Owing to their high heat- and mass-transport characteristics, gas-solid fluidized beds are widely used for gas-solid reactions (e.g. combustion, gasification, etc.) and catalytic gas phase reactions (e.g. FCC, thermal cracking etc.). In a gas-solid fluidized bed, overall reaction rate, heat and mass transport between the phases, segregation, mixing, and eventually the performance of the bed strongly depends on the dynamic characteristics of the flow. In the present work, Electrical Capacitance Tomography (ECT) is being used for the measurement of local solid volume fraction fluctuations of unary and binary gas-solid flows. The fluctuations are used to characterize the dynamics of the gas-solid flows with the help of statistical tools. In the case of binary gas-solid flow, the effect of particle properties on the dynamics and the characteristics of segregation and mixing phenomena are being investigated using the ECT measurements. This work helps to understand the dynamic characteristics of gas-solid flow and provides time-resolved measurements for the validation of two- and multi-fluid CFD models.

Publications/conference presentations:

·    Sirisha Parvathaneni, Brajesh Singh, Vivek V. Buwa, "Characterization of Polydisperse and Binary Gas-Solid Flow in a Semi-Batch Fluidized Bed using Electrical Capacitance Tomography", presented at International Symposium on Chemical Reaction Engineering (ISCRE 25), Florence (Italy), 2018.

·   Brajesh K. Singh, Shantanu Roy, Vivek V. Buwa, "Characterization of Dynamics of Unary and Binary Gas-Solid Flow in a Cylindrical Fluidized Bed using Electrical Capacitance Tomography", presented at Gas-Liquid and Gas-Liquid-Solid Reactor Engineering (GLS 13), Brussels (Belgium), 2017.

·   Brajesh K. Singh, Shantanu Roy, Vivek V. Buwa, "Dynamics of Unary and Binary Gas-Solid Flows: ECT Measurements and CFD Simulations", presented at Gas-Liquid and Gas-Liquid-Solid Reactor Engineering (GLS 12), New York (USA), 2015.

·   Brajesh K. Singh, Shantanu Roy, Vivek V. Buwa, "Characterization of Gas-Solid Flows in a Fluidized Bed using Electrical Capacitance Tomography", presented at International Symposium on Chemical Reaction Engineering (ISCRE 23), Bangkok (Thailand), 2014.