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Experimental Investigation of Green Nanofluids: Assessment of Wettability, Visc...
Nobrega, Glauco; Cardoso, Beatriz D.; Barbosa, Filipe; Pinho, Diana; Abreu, Cristiano; Souza, Reinaldo Rodrigues de; Moita, Ana S.; Ribeiro, J.E.Metallic nanoparticles are a type of nanomaterial synthesized from metallic precursors. Due to their unique physiochemical, electrical, and optical properties, metallic nanoparticles are widely studied and applied in various areas such as medicine, electronics, and heat transfer systems. However, conventional synthesis methods to produce metallic nanoparticles face challenges such as instability and environment...
Recent advances on the thermal properties and applications of nanofluids: from ...
Souza, Reinaldo Rodrigues; Gonçalves, Inês M.; Rodrigues, Raquel Oliveira; Minas, Graça; Miranda, J. M.; Moreira, António L. N.The nanofluids (NFs) are known as a colloidal suspension where nanoparticles (NPs) are dispersed in conventional base fluids (BFs). This suspension has been frequently used to augment the heat transfer (HT) capacity of a fluid by studying their thermophysical properties. This review outlines the most recent advances on the NFs thermal properties and on their applications that are being used in different fields ...
Recent developments on the thermal properties, stability and applications of na...
Nobrega, Glauco; Souza, Reinaldo Rodrigues; Gonçalves, Inês M.; Moita, Ana S.; Ribeiro, João E.; Lima, Rui Alberto Madeira MacedoIn this review work, the recent progress made in the use of nanofluids (NFs) applied in three specific areas will be presented: machining, solar energy, and biomedical engineering. Within this context, the discussions will be guided by emphasizing the thermal and stability properties of these fluids. In machining, NFs play a prominent role in the processes of turning, milling, drilling, and grinding, being resp...
A review of the advances and challenges in measuring the thermal conductivity o...
Souza, Reinaldo Rodrigues; Faustino, Vera; Gonçalves, Inês M.; Moita, Ana S.; Bañobre-López, Manuel; Lima, Rui Alberto Madeira MacedoFluids containing colloidal suspensions of nanometer-sized particles (nanofluids) have been extensively investigated in recent decades with promising results. Driven by the increase in the thermal conductivity of these new thermofluids, this topic has been growing in order to improve the thermal capacity of a series of applications in the thermal area. However, when it comes to measure nanofluids (NFs) thermal ...
Recent trends of biomaterials and biosensors for organ-on-chip platforms
Gonçalves, Inês M.; Rodrigues, Raquel Oliveira; Moita, Ana S.; Hori, Takeshi; Kaji, Hirokazu; Lima, Rui Alberto Madeira Macedo; Minas, GraçaOrgan-on-chip (OoC) platforms are a new class of advanced microfluidic devices that have been attracting significant attention for drug development since they can allow a faster and more patient specific evaluation of the effects of drugs due to the mimicking of organ human models. As most microfluidic devices, the great majority of the OoC is made from polydimethylsiloxane (PDMS), due to the easiness to handle...
A novel and extremely stable nanofluid based on iron oxide nanoparticles: Exper...
Souza, R. R.; Faustino, Vera; Oliveira, J. D.; Gonçalves, Inês M.; Miranda, João M.; Moita, Ana S.; Moreira, A. L. N.; Teixeira, José C. F.The analysis of the thermal conductivity of nanofluids (NFs) is extremely important to better understand the heat transfer mechanisms involved in the performance and efficiency of several thermal devices. In this work, two different NFs were tested using distilled water (DI-Water) as the base fluid. The first was a traditional NF formed by Al2O3 nanoparticles (NPs) and the second was a novel NF formed by polyac...
Pool boiling of nanofluids on biphilic surfaces: An experimental and numerical ...
Freitas, Eduardo; Pontes, Pedro; Cautela, Ricardo; Bahadur, Vaibhav; Miranda, João; Ribeiro, Ana P. C.; Souza, Reinaldo R.; Oliveira, Jeferson D.This study addresses the combination of customized surface modification with the use of nanofluids, to infer on its potential to enhance pool-boiling heat transfer. Hydrophilic surfaces patterned with superhydrophobic regions were developed and used as surface interfaces with different nanofluids (water with gold, silver, aluminum and alumina nanoparticles), in order to evaluate the effect of the nature and con...
Numerical optimization of a microchannel geometry for nanofluid flow and heat d...
Gonçalves, Inês M.; Rocha, César; Souza, Reinaldo Rodrigues; Coutinho, Gonçalo; Pereira, Jose E.; Moita, Ana S.; Moreira, António L. N.In this study, a numerical approach was carried out to analyze the effects of different geometries of microchannel heat sinks on the forced convective heat transfer in single-phase flow. The simulations were performed using the commercially available software <i>COMSOLMultiphysics 5.6<sup>®</sup></i> (Burlington, MA, USA) and its results were compared with those obtained from experimental tests performed in mic...
3D printing techniques and their applications to organ-on-a-chip platforms: a s...
Carvalho, Violeta Meneses; Gonçalves, Inês Maia Silva Rodrigo; Lage, Teresa Cristina Carqueijó; Rodrigues, Raquel Oliveira; Minas, GraçaThree-dimensional (3D) in vitro models, such as organ-on-a-chip platforms, are an emerging and effective technology that allows the replication of the function of tissues and organs, bridging the gap amid the conventional models based on planar cell cultures or animals and the complex human system. Hence, they have been increasingly used for biomedical research, such as drug discovery and personalized healthcar...
Experimental and numerical characterization of single-phase pressure drop and h...
Cruz, Gonçalo G.; Mendes, Miguel A. A.; Pereira, José M. C.; Santos, H.; Nikulin, A.; Moita, Ana S.The internal flow in corrugated tubes of different helical pitch, covering from the laminar to turbulent regime, was studied in order to characterize the three-dimensional flow and the influence of corrugation geometry on pressure drop and convective heat transfer. With water as working fluid and an imposed wall heat flux, ranging from around 4 to 33 kW/m2, a numerical model was developed with a CFD commercial ...