The Experts below are selected from a list of 15693 Experts worldwide ranked by ideXlab platform
Pierre Proulx - One of the best experts on this subject based on the ideXlab platform.
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Conjugated heat transfer and entropy generation of Al_2O_3–water nanofluid flows over a Heated Wall-mounted obstacle
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Ghofrane Sekrani, Sébastien Poncet, Pierre ProulxAbstract:The present study reports numerical simulations of water-based Al_2O_3 nanofluid flowing in a 2D channel with a Heated Wall-mounted obstacle. The conjugated heat transfer problem including forced convection within the fluid and conduction inside the obstacle is numerically solved using the mixture model with temperature-dependent properties. The model has been first carefully validated against published data. Then, the fluid flow and heat transfer have been investigated for six nanoparticle volume fractions $$\varphi$$ φ up to $$1.8\%$$ 1.8 % and bulk Reynolds numbers within the range $$100 \le Re \le 1600$$ 100 ≤ R e ≤ 1600 . The results show that only the Reynolds number has an influence on the hydrodynamic field, especially on the reattachment length behind the obstacle. The heat transfer rate increases with increasing nanoparticle concentrations and/or Reynolds number. The second law analysis is employed to study the heat transfer and fluid friction irreversibilities. The average entropy generation increases linearly with the Reynolds number. Increasing the nanoparticle volume fraction reduces the thermal entropy generation while the frictional one increases. Finally, the benefit of using this nanofluid is discussed regarding five merit criteria.
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conjugated heat transfer and entropy generation of al 2 o 3 water nanofluid flows over a Heated Wall mounted obstacle
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Ghofrane Sekrani, Sébastien Poncet, Pierre ProulxAbstract:The present study reports numerical simulations of water-based Al2O3 nanofluid flowing in a 2D channel with a Heated Wall-mounted obstacle. The conjugated heat transfer problem including forced convection within the fluid and conduction inside the obstacle is numerically solved using the mixture model with temperature-dependent properties. The model has been first carefully validated against published data. Then, the fluid flow and heat transfer have been investigated for six nanoparticle volume fractions \(\varphi\) up to \(1.8\%\) and bulk Reynolds numbers within the range \(100 \le Re \le 1600\). The results show that only the Reynolds number has an influence on the hydrodynamic field, especially on the reattachment length behind the obstacle. The heat transfer rate increases with increasing nanoparticle concentrations and/or Reynolds number. The second law analysis is employed to study the heat transfer and fluid friction irreversibilities. The average entropy generation increases linearly with the Reynolds number. Increasing the nanoparticle volume fraction reduces the thermal entropy generation while the frictional one increases. Finally, the benefit of using this nanofluid is discussed regarding five merit criteria.
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Conjugated heat transfer and entropy generation of Al 2 O 3 –water nanofluid flows over a Heated Wall-mounted obstacle
Journal of Thermal Analysis and Calorimetry, 2018Co-Authors: Ghofrane Sekrani, Sébastien Poncet, Pierre ProulxAbstract:The present study reports numerical simulations of water-based Al2O3 nanofluid flowing in a 2D channel with a Heated Wall-mounted obstacle. The conjugated heat transfer problem including forced convection within the fluid and conduction inside the obstacle is numerically solved using the mixture model with temperature-dependent properties. The model has been first carefully validated against published data. Then, the fluid flow and heat transfer have been investigated for six nanoparticle volume fractions \(\varphi\) up to \(1.8\%\) and bulk Reynolds numbers within the range \(100 \le Re \le 1600\). The results show that only the Reynolds number has an influence on the hydrodynamic field, especially on the reattachment length behind the obstacle. The heat transfer rate increases with increasing nanoparticle concentrations and/or Reynolds number. The second law analysis is employed to study the heat transfer and fluid friction irreversibilities. The average entropy generation increases linearly with the Reynolds number. Increasing the nanoparticle volume fraction reduces the thermal entropy generation while the frictional one increases. Finally, the benefit of using this nanofluid is discussed regarding five merit criteria.
Ghofrane Sekrani - One of the best experts on this subject based on the ideXlab platform.
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Conjugated heat transfer and entropy generation of Al_2O_3–water nanofluid flows over a Heated Wall-mounted obstacle
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Ghofrane Sekrani, Sébastien Poncet, Pierre ProulxAbstract:The present study reports numerical simulations of water-based Al_2O_3 nanofluid flowing in a 2D channel with a Heated Wall-mounted obstacle. The conjugated heat transfer problem including forced convection within the fluid and conduction inside the obstacle is numerically solved using the mixture model with temperature-dependent properties. The model has been first carefully validated against published data. Then, the fluid flow and heat transfer have been investigated for six nanoparticle volume fractions $$\varphi$$ φ up to $$1.8\%$$ 1.8 % and bulk Reynolds numbers within the range $$100 \le Re \le 1600$$ 100 ≤ R e ≤ 1600 . The results show that only the Reynolds number has an influence on the hydrodynamic field, especially on the reattachment length behind the obstacle. The heat transfer rate increases with increasing nanoparticle concentrations and/or Reynolds number. The second law analysis is employed to study the heat transfer and fluid friction irreversibilities. The average entropy generation increases linearly with the Reynolds number. Increasing the nanoparticle volume fraction reduces the thermal entropy generation while the frictional one increases. Finally, the benefit of using this nanofluid is discussed regarding five merit criteria.
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conjugated heat transfer and entropy generation of al 2 o 3 water nanofluid flows over a Heated Wall mounted obstacle
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Ghofrane Sekrani, Sébastien Poncet, Pierre ProulxAbstract:The present study reports numerical simulations of water-based Al2O3 nanofluid flowing in a 2D channel with a Heated Wall-mounted obstacle. The conjugated heat transfer problem including forced convection within the fluid and conduction inside the obstacle is numerically solved using the mixture model with temperature-dependent properties. The model has been first carefully validated against published data. Then, the fluid flow and heat transfer have been investigated for six nanoparticle volume fractions \(\varphi\) up to \(1.8\%\) and bulk Reynolds numbers within the range \(100 \le Re \le 1600\). The results show that only the Reynolds number has an influence on the hydrodynamic field, especially on the reattachment length behind the obstacle. The heat transfer rate increases with increasing nanoparticle concentrations and/or Reynolds number. The second law analysis is employed to study the heat transfer and fluid friction irreversibilities. The average entropy generation increases linearly with the Reynolds number. Increasing the nanoparticle volume fraction reduces the thermal entropy generation while the frictional one increases. Finally, the benefit of using this nanofluid is discussed regarding five merit criteria.
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Conjugated heat transfer and entropy generation of Al 2 O 3 –water nanofluid flows over a Heated Wall-mounted obstacle
Journal of Thermal Analysis and Calorimetry, 2018Co-Authors: Ghofrane Sekrani, Sébastien Poncet, Pierre ProulxAbstract:The present study reports numerical simulations of water-based Al2O3 nanofluid flowing in a 2D channel with a Heated Wall-mounted obstacle. The conjugated heat transfer problem including forced convection within the fluid and conduction inside the obstacle is numerically solved using the mixture model with temperature-dependent properties. The model has been first carefully validated against published data. Then, the fluid flow and heat transfer have been investigated for six nanoparticle volume fractions \(\varphi\) up to \(1.8\%\) and bulk Reynolds numbers within the range \(100 \le Re \le 1600\). The results show that only the Reynolds number has an influence on the hydrodynamic field, especially on the reattachment length behind the obstacle. The heat transfer rate increases with increasing nanoparticle concentrations and/or Reynolds number. The second law analysis is employed to study the heat transfer and fluid friction irreversibilities. The average entropy generation increases linearly with the Reynolds number. Increasing the nanoparticle volume fraction reduces the thermal entropy generation while the frictional one increases. Finally, the benefit of using this nanofluid is discussed regarding five merit criteria.
Sébastien Poncet - One of the best experts on this subject based on the ideXlab platform.
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Conjugated heat transfer and entropy generation of Al_2O_3–water nanofluid flows over a Heated Wall-mounted obstacle
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Ghofrane Sekrani, Sébastien Poncet, Pierre ProulxAbstract:The present study reports numerical simulations of water-based Al_2O_3 nanofluid flowing in a 2D channel with a Heated Wall-mounted obstacle. The conjugated heat transfer problem including forced convection within the fluid and conduction inside the obstacle is numerically solved using the mixture model with temperature-dependent properties. The model has been first carefully validated against published data. Then, the fluid flow and heat transfer have been investigated for six nanoparticle volume fractions $$\varphi$$ φ up to $$1.8\%$$ 1.8 % and bulk Reynolds numbers within the range $$100 \le Re \le 1600$$ 100 ≤ R e ≤ 1600 . The results show that only the Reynolds number has an influence on the hydrodynamic field, especially on the reattachment length behind the obstacle. The heat transfer rate increases with increasing nanoparticle concentrations and/or Reynolds number. The second law analysis is employed to study the heat transfer and fluid friction irreversibilities. The average entropy generation increases linearly with the Reynolds number. Increasing the nanoparticle volume fraction reduces the thermal entropy generation while the frictional one increases. Finally, the benefit of using this nanofluid is discussed regarding five merit criteria.
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conjugated heat transfer and entropy generation of al 2 o 3 water nanofluid flows over a Heated Wall mounted obstacle
Journal of Thermal Analysis and Calorimetry, 2019Co-Authors: Ghofrane Sekrani, Sébastien Poncet, Pierre ProulxAbstract:The present study reports numerical simulations of water-based Al2O3 nanofluid flowing in a 2D channel with a Heated Wall-mounted obstacle. The conjugated heat transfer problem including forced convection within the fluid and conduction inside the obstacle is numerically solved using the mixture model with temperature-dependent properties. The model has been first carefully validated against published data. Then, the fluid flow and heat transfer have been investigated for six nanoparticle volume fractions \(\varphi\) up to \(1.8\%\) and bulk Reynolds numbers within the range \(100 \le Re \le 1600\). The results show that only the Reynolds number has an influence on the hydrodynamic field, especially on the reattachment length behind the obstacle. The heat transfer rate increases with increasing nanoparticle concentrations and/or Reynolds number. The second law analysis is employed to study the heat transfer and fluid friction irreversibilities. The average entropy generation increases linearly with the Reynolds number. Increasing the nanoparticle volume fraction reduces the thermal entropy generation while the frictional one increases. Finally, the benefit of using this nanofluid is discussed regarding five merit criteria.
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Conjugated heat transfer and entropy generation of Al 2 O 3 –water nanofluid flows over a Heated Wall-mounted obstacle
Journal of Thermal Analysis and Calorimetry, 2018Co-Authors: Ghofrane Sekrani, Sébastien Poncet, Pierre ProulxAbstract:The present study reports numerical simulations of water-based Al2O3 nanofluid flowing in a 2D channel with a Heated Wall-mounted obstacle. The conjugated heat transfer problem including forced convection within the fluid and conduction inside the obstacle is numerically solved using the mixture model with temperature-dependent properties. The model has been first carefully validated against published data. Then, the fluid flow and heat transfer have been investigated for six nanoparticle volume fractions \(\varphi\) up to \(1.8\%\) and bulk Reynolds numbers within the range \(100 \le Re \le 1600\). The results show that only the Reynolds number has an influence on the hydrodynamic field, especially on the reattachment length behind the obstacle. The heat transfer rate increases with increasing nanoparticle concentrations and/or Reynolds number. The second law analysis is employed to study the heat transfer and fluid friction irreversibilities. The average entropy generation increases linearly with the Reynolds number. Increasing the nanoparticle volume fraction reduces the thermal entropy generation while the frictional one increases. Finally, the benefit of using this nanofluid is discussed regarding five merit criteria.
Frédéric Plaza - One of the best experts on this subject based on the ideXlab platform.
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Particle image velocimetry measurements of vortex rings head-on collision with a Heated vertical plate
Physics of Fluids, 2010Co-Authors: Gabriel Arévalo, Rodrigo H. Hernández, Christian Nicot, Frédéric PlazaAbstract:We report particle image velocimetry measurements of the collision of a vortex ring with a Heated Wall kept at constant temperature. We consider the case when both the vortex ring and the thermal boundary layer generated by the vertical Heated Wall are stable and laminar prior to any interaction. The impingement process can be divided into two parts. (i) A ring-driven stage, where the vortex ring grows in diameter while approaching the Wall and therefore it sweeps progressively an increased surface on the Wall. (ii) A boundary layer-driven stage, where the vortex ring moves upward due to the thermal convective motion generated by the Heated Wall. In some cases, the head-on collision triggers the ring's azimuthal instability as revealed by the formation of vortical structures arranged on a wavy starlike pattern and confirmed by flow visualizations. A single collision generates important velocity gradients and shear stresses along the Wall accompanied with the creation of local vorticity normal to the vertical Heated Wall. Peak Wall shear stresses occur near the point of impact of the vortex ring core.
Gabriel Arévalo - One of the best experts on this subject based on the ideXlab platform.
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Particle image velocimetry measurements of vortex rings head-on collision with a Heated vertical plate
Physics of Fluids, 2010Co-Authors: Gabriel Arévalo, Rodrigo H. Hernández, Christian Nicot, Frédéric PlazaAbstract:We report particle image velocimetry measurements of the collision of a vortex ring with a Heated Wall kept at constant temperature. We consider the case when both the vortex ring and the thermal boundary layer generated by the vertical Heated Wall are stable and laminar prior to any interaction. The impingement process can be divided into two parts. (i) A ring-driven stage, where the vortex ring grows in diameter while approaching the Wall and therefore it sweeps progressively an increased surface on the Wall. (ii) A boundary layer-driven stage, where the vortex ring moves upward due to the thermal convective motion generated by the Heated Wall. In some cases, the head-on collision triggers the ring's azimuthal instability as revealed by the formation of vortical structures arranged on a wavy starlike pattern and confirmed by flow visualizations. A single collision generates important velocity gradients and shear stresses along the Wall accompanied with the creation of local vorticity normal to the vertical Heated Wall. Peak Wall shear stresses occur near the point of impact of the vortex ring core.