Heat transfer and entropy generation in a microchannel with longitudinal vortex generators using Nanofluids
By Amin Ebrahimi, Farhad Rikhtegar, Amin Sabaghan, Ehsan Roohi. 2016
228 citations recorded by the source corpus.
Conjugated heat transfer and hydraulic performance for nanofluid flow in a rectangular microchannel heat sink with LVGs (longitudinal vortex generators) are numerically investigated using at different ranges of Reynolds numbers. Three-dimensional simulations are performed on a microchannel heated by a constant heat flux with a hydraulic diameter of 160 μm and six pairs of LVGs using a single-phase model. Coolants are selected to be nanofluids containing low volume-fractions (0.5%–3.0%) of Al2O3 or CuO nanoparticles with different particle sizes dispersed in pure water. The employed model is validated and compared by published experimental, and single-phase and two-phase numerical data for various geometries and nanoparticle sizes. The results demonstrate that heat transfer is enhanced by 2.29–30.63% and 9.44%–53.06% for water-Al2O3 and water-CuO nanofluids, respectively, in expense of increasing the pressure drop with respect to pure-water by 3.49%–16.85% and 6.5%–17.70%, respectively. We have also observed that the overall efficiency is improved by 2.55%–29.05% and 9.78%–50.64% for water-Al2O3 and water-CuO nanofluids, respectively. The results are also analyzed in terms of entropy generation, leading to the important conclusion that using nanofluids as the working fluid could reduce the irreversibility level in the rectangular microchannel heat sinks with LVGs. No exterma (minimums) is found for total entropy generation for the ranges of parameters studied.
Subfields: Biomedical Engineering, Mechanical Engineering
View Paper: https://www.semanticscholar.org/paper/77e4e99a67f46ea2d3eafddcef28c47e18ea6f61
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In Biomedical Engineering
- J. Meyer
- A. Mwesigye
- Z. Huan
- Saman Rashidi
- Omid Mahian
- Sébastien Poncet
- M. Eskandarian
- Evangelos Bellos
In Mechanical Engineering
- J. Meyer
- A. Mwesigye
- Z. Huan
- Omid Mahian
- Saman Rashidi
- Sébastien Poncet
- M. Eskandarian
- Evangelos Bellos
Citations in the corpus
- Thermal performance and entropy generation analysis of a high concentration ratio parabolic trough solar collector with Cu-Therminol®VP-1 nanofluid (2016, background): “14 single-phase modelling approach is said to give reasonably accurate results for both low nanoparticle concentrations and for nanoparticle diameters smaller than 100 nm [49,50].”
- Optimal thermal and thermodynamic performance of a solar parabolic trough receiver with different nanofluids and at different concentration ratios (2017, background): “Moreover, this approach has been shown to give reasonably accurate results when the volume fractions of the nanoparticles in the base fluid are low (less than 10%) and when the nanoparticles have smaller diameters (less than 100 nm) [53,54].”
- Combination of nanofluid and inserts for heat transfer enhancement (2018, methodology): “[33] investigated numerically the combined influences of longitudinal vortex generators and nanofluids on the thermal performance and irreversibility in a microchannel by using a single-phase approach.”