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LBM investigation of a Cu‐water nanofluid over various configurations of pipes in the mixed convection flow
Author(s) -
Hosseini Abadshapoori Mehdi
Publication year - 2021
Publication title -
heat transfer
Language(s) - English
Resource type - Journals
eISSN - 2688-4542
pISSN - 2688-4534
DOI - 10.1002/htj.21917
Subject(s) - nanofluid , nusselt number , materials science , natural convection , forced convection , combined forced and natural convection , coolant , thermodynamics , heat exchanger , mechanics , thermal , convection , reynolds number , physics , turbulence
Increasing the heat capacity of heat exchangers is a crucial need for modern devices. The thermal conductivity of the usual fluids and the Nusselt (Nu) number of flows containing such fluids are two bottlenecks in the way of increasing heat delivery in the heat exchangers. For this reason, nanofluids have been introduced. The effect of utilizing a Cu‐water nanofluid as a coolant of two hot pipes in a square cavity is investigated numerically with a two‐component lattice Boltzmann method. The volume fraction of nanoparticles is assumed to be constant (0.03) while the Richardson (Ri) number varies from 0.02 to 20. Results show that the effectiveness of nanoparticles is better observed in the natural convection mode. However, sedimentation is also very probable at high Ri numbers, which significantly reduces the effectiveness of the nanoparticles. Configurations which produce a natural convection stream similar to the forced convection one as well as the configurations with high spacing and hence, low heat stream interactions, are the best choices for a uniform heat rate from the pipes.