|
|
|
|
|
|
 |
|
|
Experiments and Simulations of Laminar Forced Convection With Water–Alumina Nanofluids in Circular Tubes
|
|
|
|
|
|
| Organization: | Laboratory of Transmission and Technology of Heat–LTTC |
| Department: | Department of Mechanical Engineering |
| Organization: | 2National Council of Science and Technology–CNPq |
| Organization: | 3National Institute of Industrial Property–INPI |
| Organization: | North Carolina State University |
| Department: | Department of Physics |
| Organization: | Corrosion and Metallurgy Study Centre “Aldo Dacc`o” |
| Department: | Engineering Department |
| Organization: | INMETRO, National Institute of Metrology, Standardization and Industrial Quality |
|
|
|
|
|
|
| Heat Transfer Engineering, |
|
|
|
|
|
|
This work reports fundamental experimental-theoretical research related to heat transfer enhancement in laminar channel flow with nanofluids, which are essentially modifications of the base fluid with the dispersion of metal oxide nanoparticles. The nanofluids were synthesized by a two-step approach, using a dispersant and an ultrasound probe or a ballmill for alumina nanoparticles dispersion within the aqueous media. The theoretical work involves the proposition of an extension of the thermally developing flow model that accounts for the temperature variation of all the thermophysical properties, including viscosity and the consequent variation of the velocity profiles along the thermal entry region. The simulation was performed by making use of mixed symbolic-numerical computation on the Mathematica 7.0 platform and a hybrid numerical-analytical methodology (generalized integral transform technique, GITT) in accurately handling the governing partial differential equations for the heat and fluid flow problem formulation with temperature dependency in the thermophysical properties. Experimental work was also undertaken based on a thermohydraulic circuit built for this purpose, and sample results are presented to verify the proposed model. The aim is to confirm that both the constant properties and temperature-dependent properties models, besides available correlations previously established for ordinary fluids, provide adequate prediction of the heat transfer enhancement observed in laminar forced convection with such nanofluids and within the experimented Reynolds number range.
|
|
|
|
|
|
|
|
|
|
|
|
|
| | | | | |
|
For the newest resources, visit Wolfram Repositories and Archives »
