{"id":547,"date":"2026-01-14T13:25:03","date_gmt":"2026-01-14T16:25:03","guid":{"rendered":"https:\/\/r2sol.com.br\/?page_id=547"},"modified":"2026-01-19T16:50:02","modified_gmt":"2026-01-19T19:50:02","slug":"nezia-de-rosso","status":"publish","type":"page","link":"https:\/\/r2sol.com.br\/en\/nezia-de-rosso\/","title":{"rendered":"Nezia de Rosso"},"content":{"rendered":"
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Nezia de rosso<\/span><\/h2>\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t
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Senior Researcher<\/p>\t\t\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t

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Research Center for Rheology and Non-Newtonian Fluids \u2013 CERNN<\/p>\n

Federal University of Technology Parana \u2013 UTFPR<\/p>\n

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B.Sc. in Mechanical Engineering\u00a0<\/b>(UNOESC),\u00a0M.Sc., Ph.D. in Mechanical and Materials Engineering<\/b>\u00a0(UTFPR)<\/p>\t\t\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t

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nezia@funtefpr.org.br | +55 41 98748-2188<\/p>\n

ORCID: 0000-0001-7210-9783<\/p>\n

linkedin.com\/in\/neziaderosso<\/a><\/span><\/p>\n

Curriculum vitae<\/a><\/span><\/p>\t\t\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/section>\r\n\t\t\t\t

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Research interests are in the general area of complex fluids, with a focus on rheology and petroleum engineering applications. In recent work, I have expanded into interfacial phenomena, especially how interfacial tension and wettability control emulsion stability and influence enhanced oil recovery (EOR). My work integrates numerical and experimental approaches, including Euler\u2013Euler CFD and field-representative test rigs, to address challenges in drilling hydraulics, fluid displacement (cementing hydraulics), and flow assurance, with emphasis on transient pressure transmission and restart of gelled\/paraffinic systems.<\/p>\n


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Methods\/Tools: Rheology (non-Newtonian fluids and suspensions); field-representative flowloop\/annular rigs; transient Euler\u2013Euler CFD; LabVIEW for instrumentation\/DAQ. <\/p>\t\t\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/section>\r\n\t\t\t\t

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highlight achievements<\/b><\/h2>\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/section>\r\n\t\t\t\t
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<\/div>
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Field-representative experimental unit to quantify flow restart (startup) and transient pressure transmission in gelled\/paraffinic crude oils and drilling fluids.<\/div>
Investigating the effect of crude-oil shrinkage on restart pressures to improve field-to-lab scaling and prediction of restart behavior.\n\nOperating pressure and temp.: 250 bar and 60\u20134 \u00b0C \n<\/div><\/div><\/div><\/div>
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Reduced drilling days from 96 to 44 (-52 days, \u223c54%) by developing a model that predicts drillstring movement forces in the presence of cuttings, enabling faster well-hydraulics planning and mitigation of drag\/stuck-pipe risks.<\/div><\/div><\/div><\/div>
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I formulate ultra-light OBM and WBM drilling fluids, reducing density from 8.8 \u2192 ~6.0 ppg (\u221232%) and 9.5 \u2192 ~7.3 ppg (\u221223%), using hollow microspheres, novel thickeners, and sustainable plant-based fibers while preserving rheological performance and stability.<\/div>
Emulsion stability: quantify how interfacial tension and surfactant chemistry control separation kinetics, droplet coalescence\/creaming, and rheology in waxy and essential-oil systems.\n<\/div><\/div><\/div><\/div>
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Quantified apparent\/relative viscosity in Herschel\u2013Bulkley non-colloidal suspensions versus Plastic and Reynolds numbers, using validated transient Euler\u2013Euler CFD for rheometry (parallel-plate), capturing sedimentation-driven time dependence.<\/div>
Defined safe viscosity-measurement limits by identifying a critical modified Reynolds number (Re_mod \u2248 10\u207b\u00b3) across CP\/PP\/CC geometries, showing \u22645% (1 h) deviation in CC versus up to 60% in CP.<\/div><\/div><\/div><\/div>\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t
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PROFESSIONAL EXPERIENCE<\/h2>\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/section>\r\n\t\t\t\t
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Highlighted achievements:<\/strong><\/p>

\u2022 Reduced drilling days from 96 to 44 (-52 days, \u223c54%) by developing a model that predicts drillstring movement forces in the presence of cuttings, enabling faster well-hydraulics planning and mitigation of drag\/stuck-pipe risks.<\/p>

\u2022 Quantified the impact of temperature, cooling rate, and flow rate on the restartpressure peak in waxy-crude oil flow by designing and constructing a 50-m flow-loop experiment under field-representative operating conditions, showing up to 11.5\u00d7 variation in restart pressure (+1050%) depending on operating conditions.
\u2022 Increased primary cementing displacement efficiency, showing turbulent flow tends to deliver \ud835\udefc\u2082 \u223c 1 across \ud835\udc45\ud835\udc52 \u2248 3.1 \u00d7 102
to 1.5 \u00d7 104, by leading largescale annular fluid-displacement experiments and mapping performance versus density ratio, viscosity ratio, and eccentricity (17% vs 60%), identifying density ratio as the dominant control parameter.
\u2022 Quantified apparent\/relative viscosity evolution in Herschel\u2013Bulkley non-colloidal suspensions as a function of Plastic number and Reynolds number, showing an exponential viscosity increase with Plastic number and a faster time-dependent viscosity decay at higher Reynolds numbers due to accelerated sedimentation, using a validated Euler\u2013Euler CFD model for parallel-plate rheometry.
\u2022 Established safe viscosity-measurement limitsfor non-colloidal suspensions by identifying a critical modified Reynolds number (\ud835\udc45\ud835\udc52mod \u223c 10\u2212\u00b3 ) where apparent viscosity approaches the homogeneous value, using transient Euler\u2013Euler CFD across different geometries (cone-and-plate, parallel-plate, concentric cylinder; CP\/PP\/CC) (showing \u22645% 1-h deviation in CC vs. up to 60% in CP).
\u2022 Quantified the impact of NaCl and CaCl\u2082 brines on pressure transmission and restart pressures of paraffin- and olefin-based drilling fluids, showing that CaCl\u2082-based systems exhibit higher restart pressures and stronger time dependence.<\/p>

Ongoing projects:<\/strong><\/p>

\u2022 Formulating a lightweight synthetic oil-based drilling fluid, reducing density from 8.8 to \u223c6.0 ppg (\u22122.8 ppg, \u223c32%) by incorporating low-density particles (e.g., hollow microspheres) and novel thickening agents to optimize stabilization, while maintaining rheological performance.
\u2022 Formulating a lightweight water-based drilling fluid, reducing density from 9.5 to \u223c7.3 ppg (\u22122.2 ppg, \u223c23%) by incorporating low-density particles (e.g., hollow microspheres) and sustainable plant-based fibers, and optimizing dispersion\/stabilization, while maintaining rheological performance.
\u2022 Investigating the effect of crude-oil shrinkage on restart pressures, benchmarking flow-loop observations against laboratory rheology to improve field-to-lab scaling and prediction of restart behavior.
\u2022 Studying paraffin-in-oil emulsion stability as a function of interfacial tension, by varying surfactants and relating interfacial-tension measurements to separation kinetics and droplet coalescence in waxy systems.
\u2022 Investigating how oil phase composition and emulsifier (surfactant) chemistry govern the stability of essential-oil emulsions, quantifying changes in rheology and linking them to droplet-size distribution and destabilization mechanisms (e.g., coalescence\/creaming).<\/p><\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t

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\u2022 Increased refined soybean oil throughput from 282 to 313 t\/day (+31 t\/day, \u223c11%) by optimizing operating conditions and coordinating shift execution.
\u2022 Achieved zero accidents by leading HSE execution across shifts, ensuring safe work planning and conducting incident\/near-miss investigations with corrective actions.
\u2022 Ensured continuous monitoring and\u00a0 ocumentation of soybean oil extraction and soybean meal, refined soybean oil, and utilities throughout the full production cycle by serving as Quality & Environment Production Supervisor.
\u2022 Planned and executed scheduled shutdowns and maintenance, managing contractor interfaces, start-up preparation, and safe commissioning activities, ensuring all shutdowns were completed as planned, and the units were ready to return to production on schedule.
\u2022 Led Management of Change updating Standard Operating Procedures, training teams on changes, and maintaining documentation for compliance and audits. Achieved strong audit results, meeting or exceeding required standards.<\/p><\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/section>\r\n\t\t\t\t

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SELECTED PUBLICATIONS<\/h2>\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/div>\r\n\t\t\t\t\t<\/div>\r\n\t\t<\/section>\r\n\t\t\t\t
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The accretion of ice on aircraft wings, sensors, and engines presents a serious hazard to flight safety, underscoring the need for durable and energy-efficient ice protection strategies. Among emerging strategies, porous icephobic surfaces (PISs) have attracted considerable research interest due to the favorable durability, excellent icephobic performance, and low energy requirements. Nevertheless, critical aspects such as design objectives, theoretical foundations, fabrication techniques, and durability test standards for PISs have not yet been systematically examined, resulting in unclear research directions and motivating this review. This article first provides a comprehensive overview of existing aircraft ice protection strategies, establishing a broader context for the development of PIS. Through extensive literature analysis, the review then identifies contact angle hysteresis and icephobic durability as two key design parameters for PISs. Foundational principles related to lubricant transport, heat transfer, and wetting behavior in porous media are also introduced to furnish a solid theoretical basis for PIS design. Subsequently, slippery liquid-infused porous surfaces (SLIPS) are discussed as a prominent and successful example of PIS in ice protection applications, covering their fabrication methods, failure modes, and icing characteristics. However, SLIPS are prone to lubricant depletion under shear flow and rain erosion, which can substantially compromise their icephobic performance. Recent advances in PIS design have therefore incorporated strategies such as antifreeze agent release, lubricant replenishment, and covalent anchoring to reduce lubricant loss and enhance durability. To bridge the gap between simplified laboratory durability tests and the multifaceted testing required for aeronautical applications, this review outlines essential durability evaluation protocols for aeronautical implementation. Furthermore, the potential of artificial intelligence (AI) in accelerating the development and optimization of PIS is explored. Beyond offering a thorough synthesis of recent progress in PIS technology for anti-icing, this work also highlights PIS as a promising next-generation, durable, and energy-efficient candidate for aircraft ice protection.<\/p>\n

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\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i><\/span>\r\n\t\t\t\t\t\t\t\t<\/i><\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t2. Oliveira, P. V., Fortes, L., Abdala, J., de Rosso, N., Montoya, M. I. H., Maldonado, F. L. R., & Negr\u00e3o, C. O. R. (2025). Enhancing xanthan gum dispersion in water with ethanol. Chemical Engineering Research and Design, 223, 594\u2013602. https:\/\/doi.org\/10.1016\/j.cherd.2025.10.036<\/a>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t

Xanthan gum (XG) is a biopolymer used in various industries as a thickener and stabilizer. However, its tendency to agglomerate and form lumps during dispersion in water is an industry issue. The present work investigates the effect of ethanol acting as an XG dispersant in an aqueous solution and whether the dispersant affects the solution\u00b4s stability and rheological properties. The study proposes different concentrations of XG (0.1\u202f%, 0.5\u202f%, and 1\u202f% wt) dissolved in water and an ethanol-water mixture. The results show that ethanol promotes faster and more effective hydration and dispersion of xanthan gum. This effect is particularly evident at intermediate (0.5\u202fwt%) and high (1.0\u202fwt%) concentrations, where the observed increase in viscosity suggests improved initial dispersion and enhanced rheological stability over time. The FTIR analysis indicates that ethanol disrupts hydrogen bonds, promotes polymer-polymer interactions, and increases dispersion homogeneity. Additionally, the zeta potential shows that ethanol increased the electrostatic stability of XG dispersions by augmenting the particles\u00b4 repulsion and thus preventing clustering, which results in more stable systems than water-alone solutions. The TGA analysis revealed that ethanol slightly enlarged the thermal stability of XG solutions due to stronger polymer-polymer interactions. Therefore, ethanol is an efficient, accessible, and environmentally friendly dispersant for improving XG dissolution, reducing processing time, and showing promising potential for industrial applications.<\/p>\n

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This study presents an experimental investigation into the startup flow of waxy crude oils in pipelines. An experimental rig was assembled with two syringe pumps connected to a 56.6-meter-long pipeline with an internal diameter of 10.3 mm. The experimental setup was placed within a thermal chamber to control the system temperature. The system was able to control thermal and shear history. The primary objective was to evaluate the start-up pressure required when initiating flow at a constant inlet flow rate. Unlike most prior works in the open literature, which discuss the rheological properties of crude oils at low temperatures, the current work explores the effect of the shear history, initial cooling temperature, aging time, and final cooling temperature in a startup flow loop. We also show in a pioneering experimental analysis that pressurizing the pipeline during the cooling evinces the effect of compressibility due to shrinkage on the startup of waxy crude oil.<\/p>\n

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This work investigates transient non-colloidal suspension flows in cone-and-plate, plate-plate, and cylindrical geometries to assess particle motion\u2019s impact on viscosity measurement. Mass and momentum conservation equations model the two-phase liquid\u2013solid flow, with both phases treated as continuous in an Euler-Euler approach. Findings demonstrate rheometric flow induces particle motion, affecting suspension homogeneity and viscosity measurement over time. Both buoyancy and inertia effects drive particle motion, with buoyancy dominating at low shear rates and inertia at high shear rates. Particle volume fractions, shear rates, and liquid viscosity notably influence viscosity measurements. Measurements with concentric cylinders are the least affected by particle motion. Additionally, we propose a time limit and a critical Reynolds number in which particle motion does not affect the measurement of the suspension viscosity.<\/p>\n

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This work aims at modeling the forces acting on the drill string assembly during its pull-out from the hole. Such forces arise from the interaction between equipment and both the cuttings bed and the well walls. The model is based on the continuity and momentum equations and the interactions with the cuttings bed are determined using concepts of granular materials. Comparisons with laboratory experimental data show the forces computed by the model are similar to that observed experimentally for different cuttings bed heights and drill bit areas. In addition, the model is able to predict whether a plug is formed or not. Finally, a case study was carried out by coupling the proposed model to an existing drag model to show the model’s potential for the detection of field problems.<\/p>\n

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\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/i><\/span>\r\n\t\t\t\t\t\t\t\t<\/i><\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/span>\r\n\t\t\t\t\t\t\t\t\t\t\t\t6. de Rosso, N., & Negr\u00e3o, C. O. R. (2022). Numerical simulation of non-colloidal suspension flows in a parallel-plate geometry. Rheologica Acta, 61(1), 69\u201386. https:\/\/doi.org\/10.1007\/s00397-021-01314-z<\/a>\r\n\t\t\t\t\t<\/div>\r\n\t\t\t\t\t

The current work puts forward a numerical study of non-colloidal suspension flows in a parallel-plate geometry. The inhomogeneous Euler-Euler model applied to the continuity and momentum equations is used to solve the two-phase flow problem. The aim is at the investigation of particle motion in the suspensions flow and its consequence on the measured apparent viscosity. In contrast with prior works that dealt with neutrally buoyant flows, buoyancy is now taken into account. Good agreement was obtained between measured and computed particle distributions. Analysis of this distribution reveals that not only the particle motion but also the apparent viscosity depends on whether the lower or the upper plate is rotating. Comparisons between buoyant and non-buoyant flows were performed to understand the reasons behind the particle motion. Numerical experiments were conducted by rotating the upper or lower parallel plates and varying Reynolds number, particle volume fraction, density ratio and particle size. It can be anticipated that the particle motion in buoyant flows is mainly driven by a combination of gravity and a secondary flow perpendicular to the main circumferential flow.<\/p>\n

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RESEARCH AREA<\/h2>\t\t<\/div>\r\n\t\t\t\t<\/div>\r\n\t\t\t\t
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Rheology of complex materials<\/div>\r\n\t\t\t\t\t\t\t\t\t
Multiphase flow<\/div>\r\n\t\t\t\t\t\t\t\t\t
Interfacial tension<\/div>\r\n\t\t\t\t\t\t\t\t\t
CFD<\/div>\r\n\t\t\t\t\t\t\t<\/div>\r\n\t\t\t
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Rheology of complex materials<\/div>\r\n\t\t\t\t\t