Influence of CuO nanoparticles and oil concentration on the thermodynamic properties of R600a during forced boiling convection
The effects of copper oxide (CuO) nanoparticles and Polyalphaolefin (PAO) lubricating oil on the thermophysical transport parameters of R600a (isobutane) and its flow boiling heat transfer coefficient are evaluated in this work using semi-empirical correlations. Commonly occurring refrigerant–oil mi...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-09-01
|
| Series: | International Journal of Thermofluids |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2666202725003180 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1849226843308163072 |
|---|---|
| author | Fernando Toapanta-Ramos César Nieto-Londoño |
| author_facet | Fernando Toapanta-Ramos César Nieto-Londoño |
| author_sort | Fernando Toapanta-Ramos |
| collection | DOAJ |
| description | The effects of copper oxide (CuO) nanoparticles and Polyalphaolefin (PAO) lubricating oil on the thermophysical transport parameters of R600a (isobutane) and its flow boiling heat transfer coefficient are evaluated in this work using semi-empirical correlations. Commonly occurring refrigerant–oil mixes in vapor compression refrigeration cycles result from lubrication needs in system components, affecting both transport qualities and heat transfer performance. Considering the effect produced by the heat flows, 10 kW/m2, 15 kW/m2 and 20 kW/m2, to which the fluids are being subjected. This work investigates refrigerant combinations with a maximum nanoparticle–oil ratio of 5% resulting in three formulations: R600a/CuO, R600a/PAO, and R600a/CuO/PAO as modest nanoparticle concentrations can improve these qualities. Key thermal transport parameters, including density, thermal conductivity, dynamic viscosity, and specific heat, show improvement by CuO nanoparticles with oil. Still, the R600a/CuO/PAO mixture shows hardly any variation from pure R600a. The Gungor and Winterton correlation assessed the forced flow boiling heat transfer coefficient. The results reveal that whilst PAO oil reduces the coefficient at 5%, the coefficient rises with increasing concentrations of nanoparticles in the refrigerant. The heat transfer coefficient decreases slightly when both CuO and PAO are present. |
| format | Article |
| id | doaj-art-177ed93e4abf4395bea1d767555d8cf8 |
| institution | Kabale University |
| issn | 2666-2027 |
| language | English |
| publishDate | 2025-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | International Journal of Thermofluids |
| spelling | doaj-art-177ed93e4abf4395bea1d767555d8cf82025-08-24T05:14:38ZengElsevierInternational Journal of Thermofluids2666-20272025-09-012910137210.1016/j.ijft.2025.101372Influence of CuO nanoparticles and oil concentration on the thermodynamic properties of R600a during forced boiling convectionFernando Toapanta-Ramos0César Nieto-Londoño1Research Group in Engineering, Productivity and Industrial Simulation (GIIPSI), and for the ASHRAE-UPS Branch group, and Universidad Politécnica Salesiana, Quito, EcuadorGrupo de Energía y Termodinámica, Escuela de Ingenierías, Universidad Pontificia Bolivariana, Medellín, Colombia; Grupo de Investigación en Ingeniería Aeroespacial, Escuela de Ingenierías, Universidad Pontificia Bolivariana, Medellín, Colombia; Correspondence to: Circular 1, No.70-01, Medellín, Colombia.The effects of copper oxide (CuO) nanoparticles and Polyalphaolefin (PAO) lubricating oil on the thermophysical transport parameters of R600a (isobutane) and its flow boiling heat transfer coefficient are evaluated in this work using semi-empirical correlations. Commonly occurring refrigerant–oil mixes in vapor compression refrigeration cycles result from lubrication needs in system components, affecting both transport qualities and heat transfer performance. Considering the effect produced by the heat flows, 10 kW/m2, 15 kW/m2 and 20 kW/m2, to which the fluids are being subjected. This work investigates refrigerant combinations with a maximum nanoparticle–oil ratio of 5% resulting in three formulations: R600a/CuO, R600a/PAO, and R600a/CuO/PAO as modest nanoparticle concentrations can improve these qualities. Key thermal transport parameters, including density, thermal conductivity, dynamic viscosity, and specific heat, show improvement by CuO nanoparticles with oil. Still, the R600a/CuO/PAO mixture shows hardly any variation from pure R600a. The Gungor and Winterton correlation assessed the forced flow boiling heat transfer coefficient. The results reveal that whilst PAO oil reduces the coefficient at 5%, the coefficient rises with increasing concentrations of nanoparticles in the refrigerant. The heat transfer coefficient decreases slightly when both CuO and PAO are present.http://www.sciencedirect.com/science/article/pii/S2666202725003180R600aThermal propertiesNano-particlesCuOPAO oil |
| spellingShingle | Fernando Toapanta-Ramos César Nieto-Londoño Influence of CuO nanoparticles and oil concentration on the thermodynamic properties of R600a during forced boiling convection International Journal of Thermofluids R600a Thermal properties Nano-particles CuO PAO oil |
| title | Influence of CuO nanoparticles and oil concentration on the thermodynamic properties of R600a during forced boiling convection |
| title_full | Influence of CuO nanoparticles and oil concentration on the thermodynamic properties of R600a during forced boiling convection |
| title_fullStr | Influence of CuO nanoparticles and oil concentration on the thermodynamic properties of R600a during forced boiling convection |
| title_full_unstemmed | Influence of CuO nanoparticles and oil concentration on the thermodynamic properties of R600a during forced boiling convection |
| title_short | Influence of CuO nanoparticles and oil concentration on the thermodynamic properties of R600a during forced boiling convection |
| title_sort | influence of cuo nanoparticles and oil concentration on the thermodynamic properties of r600a during forced boiling convection |
| topic | R600a Thermal properties Nano-particles CuO PAO oil |
| url | http://www.sciencedirect.com/science/article/pii/S2666202725003180 |
| work_keys_str_mv | AT fernandotoapantaramos influenceofcuonanoparticlesandoilconcentrationonthethermodynamicpropertiesofr600aduringforcedboilingconvection AT cesarnietolondono influenceofcuonanoparticlesandoilconcentrationonthethermodynamicpropertiesofr600aduringforcedboilingconvection |