Javier P. Vallejo
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View article: Comparison of Two Measurement Methods for Scattering and Absorption Coefficients in Boron Carbide Nanodispersions
Comparison of Two Measurement Methods for Scattering and Absorption Coefficients in Boron Carbide Nanodispersions Open
Nanoparticles suspended in a liquid alter the properties of the base liquid, expanding its fields of application. Nanodispersions can have several applications in solar energy, including serving as liquid sunlight absorbers, acting as opti…
View article: High-efficient, manually-shapeable gamma- and X-ray shield – an introduction of paraffin-tungsten microcomposite along with its properties and recycling possibilities
High-efficient, manually-shapeable gamma- and X-ray shield – an introduction of paraffin-tungsten microcomposite along with its properties and recycling possibilities Open
Today, it is hard to imagine modern medicine without X-ray machines or computed tomography scanners. Similarly, the energy industry would be incomplete without ecofriendly nuclear reactors, nor would advanced scientific research be possibl…
View article: Experimental Study of Paraffin-Based Composites Incorporating Different Iron–Carbon Core–Shell Particles: Analysis of Gamma-Ray Shielding and Thermal Properties
Experimental Study of Paraffin-Based Composites Incorporating Different Iron–Carbon Core–Shell Particles: Analysis of Gamma-Ray Shielding and Thermal Properties Open
Shielding nanocomposites against gamma-rays are increasingly recognized as an advantageous alternative over conventional lead-based covers. In particular, constantly evolving nanocomposites are geared toward improving features such as flex…
View article: Improving the sub-cooling and thermophysical profile of isopropyl palmitate for refrigeration applications
Improving the sub-cooling and thermophysical profile of isopropyl palmitate for refrigeration applications Open
Phase change materials have been suggested for use in refrigeration systems or thermal energy storage. However, their low thermal conductivity as well as high sub-cooling hinder the use of these materials in such applications. This study p…
View article: Advanced backfilling materials for enhancing the thermal efficiency of ground heat exchangers
Advanced backfilling materials for enhancing the thermal efficiency of ground heat exchangers Open
Residential and industrial heating and cooling systems are among the largest consumers of energy. To meet the growing energy demand in this sector, sustainable solutions are being increasingly adopted, with geothermal heat pump systems eme…
View article: Improving tribological efficiency of isopropyl palmitate oil with cellulose nanocrystals: a sustainable approach for high-performance lubricants
Improving tribological efficiency of isopropyl palmitate oil with cellulose nanocrystals: a sustainable approach for high-performance lubricants Open
This article explores the potential of cellulose nanocrystals (CNCs) as a lubricant additive for isopropyl palmitate (IPP) oil to enhance its tribological performance. CNCs, derived from renewable sources, offer a sustainable and environme…
View article: Dependence of Thermal Conductivity on Size and Specific Surface Area for Different Based CoFe2O4 Cluster Nanofluids
Dependence of Thermal Conductivity on Size and Specific Surface Area for Different Based CoFe2O4 Cluster Nanofluids Open
Enhancing the thermal conductivity of fluids by using nanoparticles with outstanding thermophysical properties has acquired significant attention for heat-transfer applications. Nanofluids have the potential to optimize energy systems by i…
View article: CO2 Capture via Adsorption Using Silica Gel
CO2 Capture via Adsorption Using Silica Gel Open
This paper investigates the potential of silica gel as an effective adsorbent for CO2 capture. The study explores the adsorption mechanisms, the efficiency of CO2 uptake, and some factors influencing the adsorption capacity of silica gel. …
View article: Assessing Anatase TiO2 Nanofluids Performance: Experimental Heat Transfer Coefficients vs. Mouromtseff Number Ratios
Assessing Anatase TiO2 Nanofluids Performance: Experimental Heat Transfer Coefficients vs. Mouromtseff Number Ratios Open
This research aims to evaluate the efficacy of Mouromtseff’s numbers in assessing the thermal transfer performance of titanium oxide (TiO2) nanosized dispersions in convective heat transfer through a pipe. New experimental coefficients of …
View article: Heat transfer and hydrodynamic performance of ZrO2 geothermal nanofluids through tubular and plate heat exchangers
Heat transfer and hydrodynamic performance of ZrO2 geothermal nanofluids through tubular and plate heat exchangers Open
The improvement in heat transfer equipment plays a significant role to enhance the overall performance of many systems and a wide variety of industrial processes. Heat exchangers are widely used in many of these applications and, with the …
View article: Scaling On Transport Properties of Nanofluids for Heat TransferApplications
Scaling On Transport Properties of Nanofluids for Heat TransferApplications Open
In the last century, Andrade proposed a theory of the viscosity of liquids based on a molecular approach and, similarly, Osida established a model for the thermal conductivity of liquids.Based on these studies, Mohanty developed an equatio…
View article: Thermophysical and Electrical Properties of Ethylene Glycol-Based Nanofluids Containing CaCO3
Thermophysical and Electrical Properties of Ethylene Glycol-Based Nanofluids Containing CaCO3 Open
The thermophysical properties of various types of nanofluids are often studied to find more effective working fluids for heat transfer applications. In this paper, the mass density, isobaric heat capacity, thermal conductivity, dynamic vis…
View article: Graphene Nanoplatelets Dispersed In Isopropyl Palmitate for the Improvement of Cold Storage Applications
Graphene Nanoplatelets Dispersed In Isopropyl Palmitate for the Improvement of Cold Storage Applications Open
This study presents experimental results of temporary stability, thermal conductivity and phase change transitions of nano-enhanced phase change materials (NePCMs) based on isopropyl palmitate (IPP).Different concentrations from 0.10 to 1 …
View article: Thermophysical, rheological and dielectric behaviour of stable carbon black dispersions in PEG200
Thermophysical, rheological and dielectric behaviour of stable carbon black dispersions in PEG200 Open
Phase change materials can store or release large amounts of energy during phase change. An increasing number of authors are studying the influence of the dispersion of nanometric particles on these materials. This article presents the des…
View article: Influence of alumina fixed-bed in steam reforming of glycerol for hydrogen production
Influence of alumina fixed-bed in steam reforming of glycerol for hydrogen production Open
In this study, hydrogen production by steam reforming was carried out in a tubular fixed-bed reactor. The influence of some operating variables such as temperature, flow rate of the feeding glycerol solution and space velocity on hydrogen …
View article: A comprehensive study of the thermophysical and rheological properties of ZrO2 based nanofluids as geothermal fluids
A comprehensive study of the thermophysical and rheological properties of ZrO2 based nanofluids as geothermal fluids Open
Geothermal heat pump systems in residential and commercial applications have become popular in many countries over the past years. The heat transfer performance of the ground heat exchangers in these systems has still room for improvement …
View article: Hybrid B4C/TiCN aqueous nanofluids for solar absorber applications
Hybrid B4C/TiCN aqueous nanofluids for solar absorber applications Open
Nanofluid-based direct absorption solar collectors (NDASCs), where the transfer fluid also shows the solar absorption functionality, could offer advantages with respect to existing conventional surface-absorber thermal solar collectors, du…
View article: Propylene Glycol-Water Based Titanium Carbonitride Nanofluids Designed For Heat Transfer Applications
Propylene Glycol-Water Based Titanium Carbonitride Nanofluids Designed For Heat Transfer Applications Open
This study aims to characterise new titanium carbonitride (TiCN) nanodispersions based on a mixture of propylene glycol and water at 20:80 mass ratio (PG:W).The temporal stability, thermal conductivity, isobaric heat capacity and dynamic v…
View article: Numerical analysis of performance uncertainty of heat exchangers operated with nanofluids
Numerical analysis of performance uncertainty of heat exchangers operated with nanofluids Open
In this paper, we analyse the performance of two types of heat exchangers with nanofluid as the working fluid in turbulent flow regime ( 4, 000–180, 000). Based on the experimental uncertainty of the thermophysical properties of the nanofl…
View article: Tuning the thermal properties of aqueous nanofluids by taking advantage of size-customized clusters of iron oxide nanoparticles
Tuning the thermal properties of aqueous nanofluids by taking advantage of size-customized clusters of iron oxide nanoparticles Open
In this study, the thermal conductivity of aqueous nanofluids containing clusters of iron oxide (Fe3O4/γ-Fe2O3) nanoparticles has been investigated experimentally for the first time, with the aim of assessing the role of a controlled aggre…
View article: Thermophysical, rheological and electrical properties of mono and hybrid TiB2/B4C nanofluids based on a propylene glycol:water mixture
Thermophysical, rheological and electrical properties of mono and hybrid TiB2/B4C nanofluids based on a propylene glycol:water mixture Open
Hybrid nanofluids aim to further improve the characteristics of mono nanofluids. However, experimental studies that jointly explore the physical properties of hybrids and the corresponding mono nanofluids are missing. In this work, mono B4…
View article: Analysis of Heat Transfer Characteristics of a GnP Aqueous Nanofluid through a Double-Tube Heat Exchanger
Analysis of Heat Transfer Characteristics of a GnP Aqueous Nanofluid through a Double-Tube Heat Exchanger Open
The thermal properties of graphene have proved to be exceptional and are partly maintained in its multi-layered form, graphene nanoplatelets (GnP). Since these carbon-based nanostructures are hydrophobic, functionalization is needed in ord…