2015 - Technology
http://dr.lib.sjp.ac.lk/handle/123456789/5808
2024-03-28T09:43:28ZCFD simulation of cyclone separators to reduce air pollution
http://dr.lib.sjp.ac.lk/handle/123456789/6728
CFD simulation of cyclone separators to reduce air pollution
Bogodage, S.G.; Leung, A.Y.T.
Attached; The present paper is based on CFD modelling of gas-solid flow in cyclone separators with different dust outlet
geometries (with and without down-comer tubes at the cyclone bottom) to analyse the flow characteristics
and the cyclone performance. Numerically obtained cyclone performance parameters, collection efficiency, and
pressure drop were compared with experimental results. Changes in the particle trajectories due to the variation
of the flow field inside the cyclone separators with the effect of the dust outlet section were also analysed in detail. The simulation results largely agreed with the experimental results, and discrepancies were caused by
modelling limitations and inconsistencies of the particle tracking model with the real gas-solid flow. However,
comparable to the experiments, the CFD simulations also predicted the increments in collection efficiencies by
dust outlet geometries modified with down-comers within acceptable pressure drops
2015-09-05T00:00:00ZImprovements of the cyclone separator performance by down-comer tubes
http://dr.lib.sjp.ac.lk/handle/123456789/6727
Improvements of the cyclone separator performance by down-comer tubes
Bogodage, S.G.; Leung, A.Y.T.
Attached; Enhancement of fine particle (PM2.5) separation is important for cyclone separators to reduce any extra
purification process required at the outlet Therefore, the present experimental research was performed
to explore the performance of cyclone separators modified with down-comer tubes at solid loading rates
from 0 to 8.0 g/m3 with a 10 m/s inlet velocity. The study proved the effectiveness of down-comer tubes
in reducing the particle re-entrainment and increasing the finer separation with acceptable pressure
drops, which was pronounced at low solid loading conditions. The experimental results were compared
with theories of Smolik and Muschelknautz. Theories were acceptable for certain ranges, and theory
breakdown was mainly due to the neglect of particle agglomeration, re-entrainment and the reduction
of swirling energy, as well as the increase of wall friction due to presence of particles
2015-03-04T00:00:00ZTowards Theoretical Framework for Use of Computer Mediated Communication: Research Productivity of Sri Lankan Academia
http://dr.lib.sjp.ac.lk/handle/123456789/4693
Towards Theoretical Framework for Use of Computer Mediated Communication: Research Productivity of Sri Lankan Academia
Samaravickrama, P.G.R.; Lekamge, G.D.
Over the last two decades, the Internet and related computer-mediated communication (CMC) technologies have become increasingly central to scientific work. CMC is a process in which human data interaction occur; through one or more networked telecommunication system s. The use of CMC in research is one of the major shifts in processes of scientific knowledge production. Therefore, investigation of the factors that relate to faculty use of CMC in their scholarly activities is important. However, there is a dearth of studies on the relationship between the use of CMC and research productivity in university academia from a theoretical perspective. No evidence was found on the impact of the use of CMC on academic productivity in Sri Lanka and therefor this research contributes on to the possible impact of CMC on academic research productivity. This paper aims to develop a theoretical framework to study the factors effect on use of CMC on research productivity of Sri Lankan academia. The objective of this research is achieved through an analysis of data collected from a questionnaire-based survey which employed a sample of 335 academic staff from six universities in Sri Lanka, through a stratified sampling method.
Motivation theories and technology diffusion and acceptance models have been reviewed and the theoretical framework integrating the Vroom's Expectancy Theory and Task Technology Fit was developed. CMC has been linked to increase the research productivity which is often measured in terms of all forms of output from a research endeavor. The principal dependent variable in the current study is all forms of output from a research endeavor. Independent latent variables in the present study are: Task characteristics, technology characteristics, individual characteristics, task technology fit, use of tools of CMC, performance, institutional factors, environmental factors and personal career development factors. Findings suggests to the policy makers in Sri Lankan universities to develop a long term effective motivation strategy to increase the research productivity in computer mediated communicational environment.
2015-01-01T00:00:00Z