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Heat transfer performance of tube bundles, which are widely used in practical applications, has been extensively investigated. Most previous experimental and numerical works for tube bundles have been performed with tube diameter in a range of 10 to 51mm and a Reynolds number of 8,000≤Re≤30,000. Recently, tube bundles with small diameter have garnered interest, since a mini-channel tube provides greater...
Different methods for thermal analysis of a high-speed permanent-magnet machine are presented. The first implemented method is a numerical method which couples computational fluid dynamics and heat-transfer equations. This method gives simultaneous solutions for the thermal and turbulent properties of the cooling fluid in a 2D axi-symmetric geometry and a 3D solution of the temperature distribution...
In the present study, a canonical geometry has been created for investigating the flow and heat transfer of a purely oscillatory jet that is not affected by the manner in which it is produced, and hence has allowed us to investigate the flow and heat transfer in a generalized approach. The unsteady Navier- Stokes equations and the convection-diffusion equation were solved using a full unsteady, two-dimensional...
In this paper, computer software is employed to simulate the temperature-field and flow-field of AP1000 PRHR HX, and investigate its heat-transferring and flow characteristic. Through comparative analysis of the distribution of temperature-field and flow-field in different locations at the same time, and the change of temperature-field and flow-field in the same location at different times, heat-transferring...
This paper provides a brief insight into the advantages of utilizing nanofluids (nano-sized particles in fluid) in replacement of conventional coolant materials. Nanofluids have been recognized as an alternative coolant material due to the heat transfer enhancement thus reducing the required coolant power. This paper presents numerical simulations of convective heat transfer under laminar flow conditions...
Using in-vivo anatomical MRI scan, a scaled-up silicone model of the human ventricular system was built. A pulsatile pressure difference was applied across the aqueduct of Sylvius, and particle tracking velocimetry was used to measure the resulting three-dimensional fluid velocity distribution within the third ventricle. The obtained results were compared to velocimetric MRI scans of the same model;...
Numerical simulation of two-dimensional stagnation-point flow is investigated with the computational fluid dynamics (CFD) software of STAR-CD and results are compared with those obtained from the similarity solution. Study shows that velocity profiles are in good agreement between numerical simulation and similarity solution for high aspect ratio in the stagnation-point region. Numerical simulation...
Results from lumped parameter thermal modeling of an axial flux permanent magnet generator based on the application of the 2-D equivalent thermal circuit are presented. The components of the generator and the internal air-flow domain are split into a system of connected and interacting control volumes. Energy and mass conservation equations are then solved for each of volume to determine its thermal...
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