Numerical Investigation of Turbulent Forced Convection Nanofluids Inside an Annulus
Journal Title: Analele Universitatii "Eftimie Murgu" Resita. Fascicula de Inginerie - Year 2015, Vol 22, Issue 2
Abstract
Turbulent forced convection heat transfer of Al2O3-water nanofluid has been studied numerically under uniform heat flux on the inner and outer walls in an annulus with rough tubes. Solid nanoparticles diameter were considered to be 18, 32, and 67 nm. Two-dimensional elliptic governing equations were used and the second-order upstream difference scheme and finite volume method were used for the discretization of governing equations. SIMPLEC algorithm has been established the relationship between pressure and velocity. The results demonstrated that the surface friction coefficient increases both in the inner and outer wall of the heat exchanger by increasing the diameter of nanoparticles. On the other side, the Nusselt number of nanofluid is greater than the base fluid for a given Reynolds number and nanoparticle volume fraction. Also, the Nusselt number decreases in the inner and outer wall with increasing the diameter of nanoparticles.
Authors and Affiliations
Farhad Vahidinia, Mohadeseh Miri, Navid Bozorgan
Keywords
Related Articles
- EP ID EP449215
- DOI -
- Views 94
- Downloads 0
Considerations Regarding the Opportunity of Using Psychological Techniques to Stimulate Solutions Characterized by Novelty and Inventive Step in TISR Transformers and Electric Motors with Shorted Moving Coil
This paper presents the appreciations and contributions regarding the use of psychological techniques to stimulate technical creativity with special reference to consonant association technique and inversion technique. T...
Optimizing Street Lighting Systems Design
This work presents solutions to improve the quality parameters for out-door illumination. The work starts from a case study which measured the outdoor lighting quality indicators on a street of the town Reşiţa. We measur...
Solving Systems of Equations with Techniques from Artificial Intelligence
A frequent problem in numerical analysis is solving the systems of equations. That problem has generated in time a great interest among mathematicians and computer scientists, as evidenced by the large number of numerica...
Effects of Structural Damage on Dynamic Behavior at Sandwich Composite Beams – Part II- FEM Analysis
This paper presents results obtained by modal analysis on composite beam like structures in healthy and damaged state. The aim is to obtain damage “signatures” for all possible damage scenarios and to use these data to a...
Contributions Concerning the Clock Hour Figure Utilization for the Power Transformer Diagnostic
The paper is based on a study for the diagnosis of power transformer through the signal configuration that are part of the clock hour figure code for a defect transformer. The investigations made have the purpose to comp...