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RISS 인기검색어
- 검색키워드
- 저자 : Shaharin Anwar Sulaiman (검색결과 2 건)
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Hydrodynamics of multi-sized particles in stable regime of a swirling bed
Chin Swee Miin,Shaharin Anwar Sulaiman,Vijay Raj Raghavan,Morgan Raymond Heikal,Muhammad Yasin Naz 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.11
Using particle imaging velocimetry (PIV), we observed particle motion within the stable operating regime of a swirling fluidized bed with an annular blade distributor. This paper presents velocity profiles of particle flow in an effort to determine effects from blade angle, particle size and shape and bed weight on characteristics of a swirling fluidized bed. Generally, particle velocity increased with airflow rate and shallow bed height, but decreased with bed weight. A 3o increase in blade angle reduced particle velocity by approximately 18%. In addition, particle shape, size and bed weight affected various characteristics of the swirling regime. Swirling began soon after incipience in the form of a supra-linear curve, which is the characteristic of a swirling regime. The relationship between particle and gas velocities enabled us to predict heat and mass transfer rates between gas and particles.
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Heat transfer in a swirling fluidized bed with geldart type-D particles
Mohd Faizal Mohideen,Binod Sreenivasan,Shaharin Anwar Sulaiman,Vijay Raj Raghavan 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.7
A relatively new variant in fluidized bed technology, designated as the swirling fluidized bed (SFB), was investigated for its heat transfer characteristics when operating with Geldart type D particles. Unlike conventional fluidized beds, the SFB imparts secondary swirling motion to the bed to enhance lateral mixing. Despite its excellent hydrodynamics,its heat transfer characteristics have not been reported in the published literature. Hence, two different sizes of spherical PVC particles (2.61mm and 3.65mm) with the presence of a center body in the bed have been studied at different velocities of the fluidizing gas. The wall-to-bed heat transfer coefficients were measured by affixing a thin constantan foil heater on the bed wall. Thermocouples located at different heights on the foil show a decrease in the wall heat transfer coefficient with bed height. It was seen that only a discrete particle model which accounts for the conduction between the particle and the heat transfer surface and the gas-convective augmentation can adequately represent the mechanism of heat transfer in the swirling fluidized bed.
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