Blar i USN Open Archive på forfatter "Ratnayake, Chandana"
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A comprehensive scaling up technique for pneumatic transport systems
Ratnayake, Chandana (Doctoral theses at NTNU;2005:169, Doctoral thesis; Peer reviewed, 2005)The main objective of this investigation was to formulate a comprehensive scaling up technique for designing of pneumatic conveying systems by addressing the whole pipeline together with all accessories. Five different ... -
Acoustic chemometrics for on-line monitoring and end-point determination of fluidised bed drying
Ihunegbo, Felicia Nkem; Ratnayake, Chandana; Halstensen, Maths (Journal article; Peer reviewed, 2013-07-02)An emerging process analytical technology (PAT) technique, acoustic chemometrics, was applied for monitoring of heated fluidised bed drying process. The feasibility of quantitative on-line monitoring of the drying progress ... -
CPFD Modeling to study the Hydrodynamics of an Industrial Fluidized Bed Reactor for Alumina Chlorination
Barahmand, Zahir; Jayarathna, Chameera; Ratnayake, Chandana (Journal article; Peer reviewed, 2022)Aluminum is one of the most used metals. Since aluminum has a unique combination of appealing properties and effects, it allows significant energy savings in many applications, such as vehicles and buildings. Although this ... -
CPFD Simulations on a Chlorination Fluidized Bed Reactor for Aluminum Production: An Optimization Study
Barahmand, Zahir; Jayarathna, Chameera; Ratnayake, Chandana (Journal article; Peer reviewed, 2022)Early CPFD simulation studies on designing a fluidized bed reactor for alumina chlorination showed that the model suffers from high particle outflow and dense phase bed channeling. The present study is aimed to optimize ... -
Design of a Medium-Scale Circulating Fluidized Bed Reactor for Chlorination of Processed Aluminum Oxide
Barahmand, Zahir; Aghaabbasi, Omid; Salcido, Jose Luis; Rustad, Emmy Kristine; Jayarathna, Chameera; Ratnayake, Chandana (Journal article; Peer reviewed, 2022)Fluidization is a well-established and widely used technology in the process industry. The production stability and the large effective contact area between the active substances, resulting in high mass and heat transfer ... -
Design of an Industrial Chlorination Reactor using CPFD Simulations
Barahmand, Zahir (Master thesis, 2021)Aluminum is now the world's second most used metal. Since aluminum has a unique combination of appealing properties and functionalities, it allows for significant energy savings in many applications, such as vehicles and ... -
Design of Fine Powder Handling System Enhancing the Circularity of Aluminium Production
Kumarawela, Thanushi Rajinika (Master thesis, 2023)Hydro Aluminium wants to separate fine powder particles (filter dust) from the process and send them to a specifically built storage silo by a pneumatic conveying line to mix with basement dust and feed back into the main ... -
Development of a CPFD model-based technique to optimize feed pellets transfer systems in fish farms
Okoro, John Ikechukwu (Master thesis, 2022)Erosion impact and pellet breakage predictions due to high velocities during pneumatic transport is a cause of concern in the fish farming industry, as it poses a threat to the pipe integrity; leading to increased cost of ... -
Development of Circular Economy Routes for Refractory Waste
Abir, Sheikh Saimon Ahamed (Master thesis, 2023)Refractory materials have the ability to withstand high temperatures without damaging their properties. They are used to protect production processes while maintaining their characteristics in extreme conditions. However, ... -
The Effect of Impurities on γ-Alumina Chlorination in a Fluidized Bed Reactor: A CPFD Study
Barahmand, Zahir; Jayarathna, Chameera; Ratnayake, Chandana (Peer reviewed; Journal article, 2022)Alumina is one of the most widely used materials today, with a total annual production of millions of tonnes of highly pure alumina. A large portion of this is used to make metal aluminum. Apart from that, a growing amount ... -
Online acoustic chemometric monitoring of fish feed pellet velocity in a pneumatic conveying system
Halstensen, Maths; Ihunegbo, Felicia Nkem; Ratnayake, Chandana; Sveinsvold, Karl (Journal article; Peer reviewed, 2014-03-14)Fish farmers consider the cost of fish feed pellets as one of the most expensive factors in fish cultivation. Proper control of the handling and conveying systems is necessary to avoid damage and disintegration of the ... -
Sensitivity and Uncertainty Analysis in a Circulating Fluidized Bed Reactor Modeling
Barahmand, Zahir; Jayarathna, Chameera; Ratnayake, Chandana (Peer reviewed; Journal article, 2022)As in many real applications, in the world of fine powders and small particles, there are uncertainties and vagueness in the parameters such as particle size, sphericity, initial solid void fraction, envelope density, etc. ... -
Study of the Thermal Performance of Industrial Alumina Chlorination Reactor Based on CPFD Simulation
Barahmand, Zahir; Jayarathna, Chameera; Ratnayake, Chandana (Peer reviewed; Journal article, 2022)As a part of the new sustainable aluminum production process under study, alumina chlorination plays a crucial role. The relevant process is an exothermic reaction in a fluidized bed reactor. The solid alumina reacts with ... -
Understanding influential process parameters of NPK fertilizer production; A study on prilling process in the NPK3 prilling tower (POR)
Ytterbø, Anders Aaland (Master thesis, 2022)A transient conduction model was implemented in Python to assess the temperature development of NPK particles, produced at Herøya, Porsgrunn. Temperatures when hitting the tower bottom was calculated to be 102.8, 67.5 and ...