Document Details

Document Type : Thesis 
Document Title :
Laminar mixed convection heat transfer analysis in horizontal annuli using hybrid nanofluid
تحليلات نقل الحرارة بالحمل الحراري المختلط الرقائقي في الحلقات الافقية باستخدام مائع نانوي هجين
 
Subject : Faculty of Engineering 
Document Language : Arabic 
Abstract : The improved thermal behavior of nanofluids could provide the foundation for a significant advance in the intensification of heat transmission. In this study, laminar mixed convection heat transfer in horizontal annuli is investigated. Hybrid nanofluids are utilized, and thermal boundary conditions consisting of fixed heat flux at the inner wall and an isothermal outside wall are taken into consideration. The numerical algorithm known as SIMPLER is utilized. The hybrid nanofluid is made up of nanoparticles of Ag-TiO2 dispersed in water. The primary objective of this research is to examine the thermal-hydrodynamic features of the hybrid nanofluid considered. According to the findings of the investigation, buoyancy-induced secondary flow is a significant contributor to the overall rate of heat transfer. It was discovered that buoyancy has a substantial effect on the formation of the axial flow and temperature field. The peak of the axial velocity profiles was found to move closer to the inner wall due to a larger buoyancy impact there as a result of the combined influence of flow development and the “Reynolds number” on the axial component of velocity. “Nusselt number” is found to rise with increasing volumetric concentration at a fixed axial position. At far downstream, the “Nusselt number” for hybrid nanofluid (Ψ=0.05) was 10.4% higher than that for pure water. Barring a small portion near the inlet, the “Nusselt number” at any axial location increases with increasing radius ratio. At a fixed axial position, it is also seen that the “Nusselt number” rises dramatically with increasing Grashoff number. At the entrance, axial variation of Nusselt number follows the pure forced convection as the buoyancy effect is very weak in this region. However, at far downstream, the flow pattern deviates from pure forced convection phenomenon as buoyancy effect becomes significant. In this region, as Richardson number (Ri) increases with decreasing Reynolds number, Nusselt number also increases with decreasing Reynolds number. Comparison of the “Nusselt number” for hybrid nanofluid (Ag-TiO2/water) to that of conventional nanofluid (TiO2/water) reveals a slight (0.9%) increase in “Nusselt number” irrespective of nanoparticle concentrations in volume. 
Supervisor : Dr. Nazrul Islam Abdulhafiz 
Thesis Type : Master Thesis 
Publishing Year : 1444 AH
2023 AD 
Co-Supervisor : Dr. Radi Alsulami 
Added Date : Thursday, June 29, 2023 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
رياض فايز الياسيAlYasi, Riyadh FayezResearcherMaster 

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