Lattice Boltzmann simulation for hydrothermal analysis of free convection within dumbbell-shaped heat exchanger

AuthorsAlireza Rahimi , Ali Dehghan Saee , Abbas Kasaeipoor , Payam Hooshmand , Emad Hasani Malekshah
JournalCHINESE J PHYS
Page number2865
Volume number56
IFثبت نشده
Paper TypeFull Paper
Published At2018-12-06
Journal GradeScientific - research
Journal TypeTypographic
Journal CountryIran, Islamic Republic Of
Journal IndexISC

Abstract

The lattice Boltzmann simulation of nanofluid flow and heat transfer during natural convection within a dumbbell-shaped heat exchanger is carried out. The heat exchanger is filled with CuOwater. The KKL model is employed to predict the thermo-physical properties of nanofluid. In order to perform a comprehensive hydrothermal investigation, different post-processing approaches such as heatline visualization, total entropy generation, local entropy generation based on local fluid friction irreversibility and heat transfer irreversibility, average and local Nusselt variation are employed. In the present investigation, it is tried to present the impact of different influential parameters like Rayleigh number, solid volume fraction of nanofluid and thermal arrangement of internal fins-bodies on the fluid flow, heat transfer rate and entropy generation.

tags: Dumbbell-shaped heat exchanger; CuO-water nanofluid; KKL model; Lattice Boltzmann method; Heatline visualization