Author
Eric C. Okonkwo
Other affiliations: Cyprus International University, Korean Council for University Education
Bio: Eric C. Okonkwo is an academic researcher from Khalifa University. The author has contributed to research in topics: Nanofluid & Parabolic trough. The author has an hindex of 13, co-authored 37 publications receiving 514 citations. Previous affiliations of Eric C. Okonkwo include Cyprus International University & Korean Council for University Education.
Topics: Nanofluid, Parabolic trough, Exergy, Heat transfer, Photovoltaic system
Papers
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TL;DR: A review of the progress made in the area of nanofluids preparation and applications in various heat transfer devices such as solar collectors, heat exchangers, refrigeration systems, radiators, thermal storage systems and electronic cooling is presented in this paper.
Abstract: The field of nanofluids has received interesting attention since the concept of dispersing nanoscaled particles into a fluid was first introduced in the later part of the twentieth century This is evident from the increased number of studies related to nanofluids published annually The increasing attention on nanofluids is primarily due to their enhanced thermophysical properties and their ability to be incorporated into a wide range of thermal applications ranging from enhancing the effectiveness of heat exchangers used in industries to solar energy harvesting for renewable energy production Owing to the increasing number of studies relating to nanofluids, there is a need for a holistic review of the progress and steps taken in 2019 concerning their application in heat transfer devices This review takes a retrospective look at the year 2019 by reviewing the progress made in the area of nanofluids preparation and the applications of nanofluids in various heat transfer devices such as solar collectors, heat exchangers, refrigeration systems, radiators, thermal storage systems and electronic cooling This review aims to update readers on recent progress while also highlighting the challenges and future of nanofluids as the next-generation heat transfer fluids Finally, a conclusion on the merits and demerits of nanofluids is presented along with recommendations for future studies that would mobilise the rapid commercialisation of nanofluids
181 citations
TL;DR: In this paper, the specific heat and viscosity of Al2O3-ZnO water hybrid nanofluids at three mixture ratios are taken over different temperatures at different volume concentrations.
112 citations
TL;DR: In this paper, the performance of a flat plate collector operating with both mono and hybrid nanofluids was evaluated and the results showed that the use of alumina-water at a concentration of 0.1% presented a thermal enhancement of 2.16% in the collector, while the hybrid nano-fluids reduced the thermal performance of the collector by 1.79% compared to water.
90 citations
TL;DR: In this paper, a review of the challenges and opportunities associated with substituting heavy fuel oils used for maritime transportation with relatively cleaner fuels is presented, with an emphasis on how LNG exporters can establish synergies across the supply chain to also deliver the end-product required by customers instead of delivering only LNG.
88 citations
TL;DR: In this paper, a green alternative of using nanoparticles synthesized from green bio-matter (Olive leaf extract OLE) and agricultural waste (barley husk BH) is proposed.
66 citations
Cited by
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TL;DR: In this paper, the authors summarized the existing alternative designs of PTC and suggested the future trends in this area, as well as the use of concentrating thermal photovoltaic collectors.
225 citations
TL;DR: In this paper, the effect of nanoparticles on thermal efficiency, entropy generation, heat transfer coefficient enhancement, as well as pressure drop in parabolic trough collectors (PTCs) has been investigated.
Abstract: The present review paper aims to document the latest developments on the applications of nanofluids as working fluid in parabolic trough collectors (PTCs). The influence of many factors such as nanoparticles and base fluid type as well as volume fraction and size of nanoparticles on the performance of PTCs has been investigated. The reviewed studies were mainly categorized into three different types of experimental, modeling (semi-analytical), and computational fluid dynamics (CFD). The main focus was to evaluate the effect of nanofluids on thermal efficiency, entropy generation, heat transfer coefficient enhancement, as well as pressure drop in PTCs. It was revealed that nanofluids not only enhance (in most of the cases) the thermal efficiency, convection heat transfer coefficient, and exergy efficiency of the system but also can decrease the entropy generation of the system. The only drawback in application of nanofluids in PTCs was found to be pressure drop increase that can be controlled by optimization in nanoparticles volume fraction and mass flow rate.
186 citations
TL;DR: A review of the progress made in the area of nanofluids preparation and applications in various heat transfer devices such as solar collectors, heat exchangers, refrigeration systems, radiators, thermal storage systems and electronic cooling is presented in this paper.
Abstract: The field of nanofluids has received interesting attention since the concept of dispersing nanoscaled particles into a fluid was first introduced in the later part of the twentieth century This is evident from the increased number of studies related to nanofluids published annually The increasing attention on nanofluids is primarily due to their enhanced thermophysical properties and their ability to be incorporated into a wide range of thermal applications ranging from enhancing the effectiveness of heat exchangers used in industries to solar energy harvesting for renewable energy production Owing to the increasing number of studies relating to nanofluids, there is a need for a holistic review of the progress and steps taken in 2019 concerning their application in heat transfer devices This review takes a retrospective look at the year 2019 by reviewing the progress made in the area of nanofluids preparation and the applications of nanofluids in various heat transfer devices such as solar collectors, heat exchangers, refrigeration systems, radiators, thermal storage systems and electronic cooling This review aims to update readers on recent progress while also highlighting the challenges and future of nanofluids as the next-generation heat transfer fluids Finally, a conclusion on the merits and demerits of nanofluids is presented along with recommendations for future studies that would mobilise the rapid commercialisation of nanofluids
181 citations
TL;DR: A review of literature on the effects of using nanofluids (NFs) in energy systems is presented in this paper, where different types of NFs, including the combination of metal and non-metal particles of nanometer sizes with a base fluid, are introduced.
167 citations