MERCon - 2015http://dl.lib.uom.lk/handle/123/146962024-03-29T14:50:35Z2024-03-29T14:50:35ZMoratuwa Engineering Research Conference - MERCon 2015 [Pre Text]http://dl.lib.uom.lk/handle/123/194912023-10-13T02:18:11Z2015-01-01T00:00:00ZMoratuwa Engineering Research Conference - MERCon 2015 [Pre Text]
2015-01-01T00:00:00ZThe Effectiveness of a watersoluble synthetic acrylic polymer in enhancing reinforcing action of Silica in Carboxylated Acrylonitrile Butadiene Rubber LatexLiyanaarachchi, LADALiyanage, NMVKhttp://dl.lib.uom.lk/handle/123/135862023-11-06T07:57:26Z2015-01-01T00:00:00ZThe Effectiveness of a watersoluble synthetic acrylic polymer in enhancing reinforcing action of Silica in Carboxylated Acrylonitrile Butadiene Rubber Latex
Liyanaarachchi, LADA; Liyanage, NMVK
Carboxylated acrylonitrile butadiene rubber (XNBR) latex was filled with surface modified precipitated silica. Surface modification of silica was affected in an aqueous medium
by reacting with a synthetic polymer (SP) containing both hydrophilic and hydrophobic groups. The effectiveness of SP in enhancing reinforcing action of silica in XNBR latex films was evaluated through investigation of mechanical properties of vulcanized latex films cast from XNBR latex compounds filled with modified silica over a range of 5 to 20 phr loadings. Tear strength, which is an important mechanical property in certain
latex based products like gloves, of modified silica filled cast films was found to be improved in comparison with that of unmodified silica filled cast films. Tear properties of cast films were continued to increase within the range of filler loadings investigated. An optimization of tensile strength was observed at 15phr filler loading in films containing modified fillers and it exceeds the tensile strength of unmodified filler added films with
same loading. Morphological studies performed by scanning electron microscopy illustrated that a better distribution of modified filler particles within the XNBR matrix has occurred which may be a consequence of the discouragement of filler aggregation with surface modification. Surface modification of silica has improved the reinforcement action on XNBR.
2015-01-01T00:00:00ZSteady state performance variation of domestic refrigerators under different ambient conditions of Sri LankaAnjana, HMKNimarshana, PHVAttalage, RAhttp://dl.lib.uom.lk/handle/123/135852019-08-08T08:09:44ZSteady state performance variation of domestic refrigerators under different ambient conditions of Sri Lanka
Anjana, HMK; Nimarshana, PHV; Attalage, RA
There is a non-negligible variation in climatic conditions in different geographical locations of Sri Lanka. Testing the performance under single climatic condition will not reflect the actual performance of a refrigerator at its intended deployment. This research is aimed at studying the performance of a domestic refrigerator unit under simulated climatic conditions representing different climate zones in Sri Lanka with respect to its dry bulb temperature. Experiments were conducted under controlled environmental conditions to emulate the climatic conditions of different climatic zones in Sri Lanka. Average hourly power consumption under each climatic condition was calculated from the results. Projected annual energy consumption and performance of the overall refrigeration cycle were also estimated. Results indicated a 5.6% increase of energy consumption per 1̊C increase of ambient temperature. Annual power consumption shows 54.2% variation within the evaluated locations. A simulation model was developed to perform the evaluation. Existing mathematical model was adopted to calculate the performance of the refrigeration cycle.
Simulation of ancient wind-driven iron smelting furnaces of Sri LankaKumbalathara, AAKLiyanage, DDWitharana, SRajika, JKATNarayana, MFernando, KCNhttp://dl.lib.uom.lk/handle/123/135842022-09-14T06:00:02ZSimulation of ancient wind-driven iron smelting furnaces of Sri Lanka
Kumbalathara, AAK; Liyanage, DD; Witharana, S; Rajika, JKAT; Narayana, M; Fernando, KCN
Metal processing industry in Sri Lanka began around 3000BC. Ancient chronicles like Mahavansaya, Thupavansa and Pujavaliya proved the Sri Lanka’s history of metal industry. Archaeometallurgical surveys of Sri Lanka have revealed a non-conventional wind-driven iron smelting furnace for the first time in the world. Some of them dated
back to third century BC. Replications of iron smelting process have shown the ability of those furnaces to operate and produce high carbon Steel. CFD modeling and simulation is a popular tool to further understand the fluid flow patterns within and surrounding a furnace. This paper discusses the initial steps of modeling and simulation of the total process of iron smelting in the west-facing furnaces situated in Samanalawewa area of Sri Lanka. Main focus of the paper is to analyze the cold flow at 2D and 3D steady state conditions by using the open source OpenFOAM CFD software with over 9million cells for 3D simulation in finite volume method. The results have been compared with a validated simulation on the same furnace using the commercial CFD code Fluent.