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Ofelia Jianu   Ms.  Graduate Student or Post Graduate 
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Ofelia Jianu published an article in June 2017.
Top co-authors
Marc A. Rosen

435 shared publications

Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Ontario, Canada

Greg F. Naterer

176 shared publications

Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, Newfoundland and Labrador, Canada

G.F. Naterer

49 shared publications

Mem. ASME Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John's, NL A1B 3X5, Canada

11
Publications
19
Reads
1
Download
3
Citations
Publication Record
Distribution of Articles published per year 
( - 2017)
Total number of journals
published in
 
7
 
Publications See all
Article 3 Reads 0 Citations Preliminary Assessment of Noise Pollution Prevention in Wind Turbines Based on an Exergy Approach Ofelia A. Jianu, Marc A. Rosen Published: 30 June 2017
European Journal of Sustainable Development Research, doi: 10.20897/ejosdr/68582
DOI See at publisher website ABS Show/hide abstract
Most existing methods for energy transformation and use are inadvertently contaminating our watersupplies, releasing greenhouse gasses into the atmosphere, emitting compounds that diminish the earth'sprotective blanket of ozone, and depleting the earth's crust of natural resources. As a result, scientists andengineers are increasingly pursuing sustainable technologies so that costs associated with global warmingcan be minimized and adverse impact on living organisms can be prevented. A promising sustainablemethod is to harness energy from the wind via wind turbines. However, the noise generated by wind turbinesproves to be one of the most significant hindrances to the extensive use of wind turbines. In this study,noise generation produced by flow over objects is investigated to characterize the noise generated due toflow-structure interaction and aeroacoustics. As a benchmark, flow over a cylinder has been chosen for thisstudy, with the aim of correlating three main characteristics in noise generation. Hence, the generated soundpressure level, exergy destroyed and the normal flow velocity (∪ ∞) are employed to characterize the systemin order to relate the exergy destruction to the noise generated in the flow. The correlation has the potentialto be used in wind turbine designs to minimize noise pollution due to aerodynamic noise.
Article 3 Reads 1 Citation Preliminary Assessment of Noise Pollution Prevention in Wind Turbines Based on an Exergy Approach Ofelia A. Jianu, Marc A. Rosen Published: 30 June 2017
European Journal of Sustainable Development Research, doi: 10.20897/ejosdr.201712
DOI See at publisher website ABS Show/hide abstract
Most existing methods for energy transformation and use are inadvertently contaminating our watersupplies, releasing greenhouse gasses into the atmosphere, emitting compounds that diminish the earth'sprotective blanket of ozone, and depleting the earth's crust of natural resources. As a result, scientists andengineers are increasingly pursuing sustainable technologies so that costs associated with global warmingcan be minimized and adverse impact on living organisms can be prevented. A promising sustainablemethod is to harness energy from the wind via wind turbines. However, the noise generated by wind turbinesproves to be one of the most significant hindrances to the extensive use of wind turbines. In this study,noise generation produced by flow over objects is investigated to characterize the noise generated due toflow-structure interaction and aeroacoustics. As a benchmark, flow over a cylinder has been chosen for thisstudy, with the aim of correlating three main characteristics in noise generation. Hence, the generated soundpressure level, exergy destroyed and the normal flow velocity (∪ ∞) are employed to characterize the systemin order to relate the exergy destruction to the noise generated in the flow. The correlation has the potentialto be used in wind turbine designs to minimize noise pollution due to aerodynamic noise.
Article 3 Reads 0 Citations X-ray diffraction of crystallization of copper (II) chloride for improved energy utilization in hydrogen production O.A. Jianu, M. Lescisin, Z. Wang, M.A. Rosen, G.F. Naterer Published: 01 May 2016
International Journal of Hydrogen Energy, doi: 10.1016/j.ijhydene.2015.12.213
DOI See at publisher website
Article 0 Reads 0 Citations Experimental investigation of particle dissolution rates in aqueous solutions for hydrogen production O. A. Jianu, Z. Wang, M. A. Rosen, G. F. Naterer Published: 28 November 2015
Heat and Mass Transfer, doi: 10.1007/s00231-015-1724-y
DOI See at publisher website
Article 0 Reads 1 Citation Two-phase bubble flow and convective mass transfer in water splitting processes O.A. Jianu, M.A. Rosen, G.F. Naterer, Z. Wang Published: 01 March 2015
International Journal of Hydrogen Energy, doi: 10.1016/j.ijhydene.2015.01.074
DOI See at publisher website
BOOK-CHAPTER 0 Reads 0 Citations Mass Transfer and Bubble Flow Dynamics in Aqueous Solutions for Hydrogen Production Cycles O. A. Jianu, M. A. Rosen, G. F. Naterer, Z. Wang Published: 09 September 2014
Progress in Sustainable Energy Technologies Vol II, doi: 10.1007/978-3-319-07977-6_26
DOI See at publisher website
Conference papers
CONFERENCE-ARTICLE 5 Reads 0 Citations An Exergy Based Approach to Noise Prevention in Wind Turbines: Concept and Preliminary Assessment Ofelia Jianu, Marc Rosen, Greg Naterer Published: 30 October 2012
doi: 10.3390/wsf2-01163
DOI See at publisher website ABS Show/hide abstract
Unsustainable human activities and practices are polluting water supplies and emitting to the atmosphere greenhouse gases as well as compounds that erode the earth\'s protective ozone layer. The potential impact on human health and economic costs associated with global warming have motivated scientists and engineers to seek sustainable technologies. One such technology is the wind turbine, which harnesses energy from the wind. However, a significant hindrance preventing the widespread use of wind turbines is the noise they produce. This study examines flow over an object and the consequent noise generation produced by this flow-structure interaction. Flow over a cylinder has been chosen as the benchmark. The aim of this study is to correlate three main characteristic parameters of the system, namely, the generated sound pressure level, the exergy destroyed, and the normal flow velocity). The main motivation for this work is to relate the exergy destruction to the noise generated in the flow to improve understanding and to provide a correlation can be utilized to reduce or minimize the noise of wind turbines.
CONFERENCE-ARTICLE 5 Reads 0 Citations Noise Polution Prevention in Wind Turbines: Status and Recent Advances Greg Naterer, Ofelia Jianu, Marc Rosen Published: 04 November 2011
doi: 10.3390/wsf-00623
DOI See at publisher website ABS Show/hide abstract
The global trend towards sustainability has led to increased interest in alternative power sources to coal and other fossil fuels. One of these sustainable sources is wind energy, which we can harness through wind turbines. However, a significant hindrance preventing the widespread use of wind turbines is the noise they produce. This study reviews recent advances in the area of noise pollution from wind turbines. To date, there have been many different noise control studies. In order to successfully reduce or prevent the noise generated, the sources of noise must be identified. Two major sources of noise are present during operation: mechanical noise and aerodynamic noise. Mechanical noise generally originates from the many different components within the wind turbine, such as the generator, the hydraulic systems and the gearbox. Different mechanical noise prevention strategies such as vibration suppression, vibration isolation and fault detection techniques are presented in this paper. Aerodynamic noise prevention strategies are also discussed. Aerodynamic noise is the dominant source of noise from wind turbines, with a sound power level of 99.2 dB A. Breaking this noise source down, the largest contributor to aerodynamic noise comes from the trailing edge of wind turbine blades. Strategies for reducing aerodynamic noise include adaptive solutions and wind turbine blade modification methods. There are a number of adaptive noise reduction solutions including varying the speed of rotation of the blades and increasing the pitch angle. Although such strategies have been successfully implemented for noise reduction purposes, they can cause significant power loss. Therefore, alternative methods of adaptive solutions are sought. Blade modification methods such as adding serrations have proven to be beneficial in reducing noise without any power loss. The aim of this paper is to critically analyse and compare the different methods currently being implemented and investigated to reduce noise production from wind turbines, with a focus on the noise generated from the trailing edge.
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