Browsing by Author "Sharma, Arvind Kumar"

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Comprehensive study of fluidization characteristics and variations of moisture content in fluidized bed drying of soybean
(IOP, 2021) Sharma, Arvind Kumar
In this exhaustive study, the investigation has been done on the strength of moisture content, air temperature and air entry speed on the drying kinetics and fluidization height during fluidized bed drying of soybean using electric heater as a heating medium. And it is obvious from the observing values, the height of the fluidized bed increased with the increment in inlet Vs and fluidization height decreased with lower inlet Vs. If the mass flow rate reduced, the corresponding height of the bed increased and vice versa for high mass flow rate. Fluidized bed drying was able to reduce drying time in comparison to the fixed bed and hence it could be used to reduce heterogeneity in the bed during drying. In drying kinetics, with the increase in drying parameters, rate constants and diffusivity have also increased.
Digital image analysis of gas bypassing and mixing in gas-fluidized bed: effect of particle shape
(Wiley, 2024-10) Mohanta, Hare Krishna; Goyal, Navneet; Sande, Priya Christina; Sharma, Arvind Kumar
The study investigates effect of particle shape on gas bypassing and mixing of gas-fluidized Geldart A particles. A shallow fluidized bed (FB), configured at benchscale, was used with digital image analysis (DIA) for the investigation. The extent of scatter of tracer particles throughout the bed was assessed from DIA images of defluidized powder. A novel method employing Jupyter notebook software, was used to directly determine Mixing Index from digital images. Remarkably, platelet-shaped China clay powder displayed the best mixing characteristics (Mixing Index: 0.79) with no significant bypassing. Angular shaped Quartz displayed moderate mixing (Mixing Index: 0.67), but high bypassing (Bypassing Index: 0.75). Contrary to conventional assumptions, spherical-shaped diatomite exhibited poor mixing (Mixing Index: 0.61) with the highest bypassing (Bypassing Index: 0.82). Platelet particles performed well even with fines removal. Most likely, particle shape significantly influenced the number of available particle contact points, tracer migration, and traceronparticle binding.
PIV investigation on the effect of gas distributor design for fluidization of Geldart A spherical particles
(Elsevier, 2024-06) Sande, Priya Christina; Sharma, Arvind Kumar; Mohanta, Hare Krishna
This is a hydrodynamics study on gas distribution during fluidization of the industrially relevant Geldart A type particles. The impact of 10 different distributor designs comprising perforated distributors (pitch and orifice arrangement pattern varied) and nozzle distributors (nozzle size varied) were studied experimentally on a bench-scale unit. Particle flow homogeneity in air was determined by a novel Particle Image Velocimetry (PIV) analysis of the freeboard velocity field. Over 50 PIV particle phase vector field images are presented and analysed. Bed expansion, Particle attrition with and without fines, velocity profiles with and without fines and effect of fines on bed expansion were ascertained. Best distributor design for a unit such as Fluid Catalytic Cracking (FCC) regenerator and FCC riser were found to be 0.8 cm and 0.6 cm nozzle plates distributors respectively. Confirmation with previous study revealed a correlation between homogeneous distribution of particulate flow and lower number of turbulence zones.