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Kuala Lumpur, Malaysia

Jun G.J.,Petronas University of Technology | Raghavan V.R.,Petronas University of Technology | Sing C.Y.,OYL Sdn. Bhd.
Applied Mechanics and Materials | Year: 2012

In recent years, the Swirling Fluidized Bed has been regarded as one of the novel designs in fluidization technology. This new technique features an annular blade distributor which injects the fluidizing gas through a certain inclination, is capable of fluidizing the bed and at the same time causes swirling motion of particles in a circular trajectory. In the present work, the fluidization characteristics and hydrodynamics of a swirling bed are studied using an experimental approach. The behavior of gas-particle interaction in a swirling bed in terms of operation regimes, trend of pressure drop across the bed and the hysteresis effect, are explored with varying bed configurations. Seven sets of particles, three in spherical shape, two in cylindrical shape and two in irregular shape, are used as bed material by considering bed weights from 500 g to 2000 g and blade overlap angles 18° for air velocities up to approximately 3.5 m/s and blade inclination of 10°. The results evidently showed that particle configurations dramatically affect the beds' behavior. © (2012) Trans Tech Publications, Switzerland. Source


Tiruselvam R.,OYL Sdn. Bhd. | Chin W.M.,OYL Sdn. Bhd. | Raghavan V.R.,OYL Sdn. Bhd.
Heat and Mass Transfer/Waerme- und Stoffuebertragung | Year: 2012

Two novel enhanced tubes, viz. Turbo-C with three dimensional surface corrugations and EXTEK with helical flutes, are evaluated in the present work. They are chosen for study because of their versatility for use in condensation as well as evaporation in a double tube heat exchanger assembly, typically as used in water source heat pumps. Average and local values of heat transfer coefficient and two-phase pressure drop are reported. © Springer-Verlag 2012. Source


Tiruselvam R.,OYL Sdn. Bhd. | Chin W.M.,OYL Sdn. Bhd. | Raghavan V.R.,OYL Sdn. Bhd.
Heat and Mass Transfer/Waerme- und Stoffuebertragung | Year: 2012

The study is conducted to evaluate the heat transfer characteristics of two new and versatile enhancement configurations in a double tube heat exchanger annulus. The novelty is that they are usable in single phase forced convection, evaporation and condensation. Heat transfer coefficients are determined by the Wilson Plot technique in laminar and turbulent flow and correlations are proposed for Nusselt numbers. Comparisons are then made between heat transfer and flow friction. © Springer-Verlag 2012. Source

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