期刊
INTERNATIONAL JOURNAL OF NUMERICAL METHODS FOR HEAT & FLUID FLOW
卷 31, 期 7, 页码 2308-2329出版社
EMERALD GROUP PUBLISHING LTD
DOI: 10.1108/HFF-08-2020-0497
关键词
Natural convection; Second law analysis; Experimental measurements; BGK lattice Boltzmann method; Fe2O3-water nanofluid
资金
- SEPDCO Company
This study focuses on the analysis of natural convection and entropy production in a two-dimensional section of a heat exchanger using the lattice Boltzmann method with a Bhatnagar-Gross-Krook model. Experimental observations are conducted to measure the rheological and thermal properties of the Fe2O3-water nanofluid. The research also explores the influence of factors like inner fins structure, nanoparticle concentration, and Rayleigh number on heat transfer rate, entropy production, Bejan number, flow configuration, and temperature distributions.
Purpose The purpose of this study is analysis of the natural convection and entropy production in a two-dimensional section of the considered heat exchanger. For this purpose, the lattice Boltzmann method which is equipped with Bhatnagar-Gross-Krook model is used. This model proposes a significant accurate prediction for thermal and hydro-dynamical behaviors over free convection phenomenon. The heat exchanger is filled with Fe2O3-water nanofluid. To improve the accuracy of prediction, it is neglected to use the theoretical models for properties of nanofluid. At this end, some experimental observations are conducted, and the required rheological and thermal properties of nanofluid are measured based on laboratory work.. Design/methodology/approach The present work focuses on the influence of different factors on the thermal behaviors and entropy production of a heat exchanger. The heat exchanger is consisted by an inner tube, an outer tube and some fins which are implanted at the surface of inner tube. Findings The effects of various factors like structure of inner fins, nanoparticle concentration and Rayleigh number over the heat transfer rate, local and volumetric entropy production, Bejan number, flow configuration and temperature distributions are provided. Originality/value The originality of this work is using a new-developed numerical method for treating natural convection and experimental measurements for thermal and rheological properties of nanofluid.
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