倾斜空腔中铜/水纳米流体的自由对流传热的 LBM 模拟,加热温度分布不均匀

IF 2.7 Q3 NANOSCIENCE & NANOTECHNOLOGY Journal of Nanofluids Pub Date : 2024-04-01 DOI:10.1166/jon.2024.2135
Walid Chelia, Abdelghani Laouer, E. Mezaache
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引用次数: 0

摘要

本研究采用晶格玻尔兹曼法(LBM)对倾斜方形空腔中铜/水纳米流体的自然对流进行了数值研究。空腔左壁保持恒定的热温度,右壁的温度分布不均匀。上下壁是隔热的。研究的流体流动和传热特性参数范围很广,包括瑞利数(Ra = 103、104 和 105)、固体体积分数(Φ = 0%、2%、4% 和 6%)、振幅比(A = 0、0.5 和 1)以及正弦温度分布的相位偏差(Φ = 0、π/4、π/2、3π/4 和 π)。结果以流线、等温线和努塞尔特数的形式图示了所考虑参数的不同组合。随着雷利数和纳米颗粒体积分数的增加,纳米流体内部的传热率也随之增加。此外,振幅比的增加会导致传热速率的降低,在 A = 1 时,降低幅度高达 8.67%。另一方面,正弦温度分布相位偏差的变化会导致传热速率的增加,在 Φ = π 时可观察到高达 32.04% 的激增。
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LBM Simulation of Free Convection Heat Transfer of Cu/Water Nanofluid in Inclined Cavity with Non-Uniform Heating Temperature Distribution
In the present study, natural convection of Cu/water nanofluid in an inclined square cavity has been investigated numerically using lattice Boltzmann method (LBM). The left wall of the cavity is maintained at a constant hot temperature, while the right wall is subjected to non-uniform temperature distribution. The upper and lower walls are insulated. The fluid flow and heat transfer characteristics are investigated over a wide range of parameters, including Rayleigh numbers (Ra = 103, 104 and 105), solid volume fractions (Φ = 0%, 2%, 4% and 6%), amplitude ratio (A = 0, 0.5 and 1) and phase deviations of sinusoidal temperature distribution (Φ = 0, π/4, π/2, 3π/4 and π). The results are presented graphically in the form of streamlines, isotherms and Nusselt numbers for the different combinations of the considered parameters. The heat transfer rate inside the nanofluid increases as the Rayleigh number and the volume fraction of nanoparticles increase. Further, an increase in the amplitude ratio results in a decrease in the heat transfer rate, with a reduction of up to 8.67% at A = 1. On the other hand, changes in the phase deviation of the sinusoidal temperature distribution lead to an increase in the heat transfer rate, with a surge of up to 32.04% observed at Φ = π.
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来源期刊
Journal of Nanofluids
Journal of Nanofluids NANOSCIENCE & NANOTECHNOLOGY-
自引率
14.60%
发文量
89
期刊介绍: Journal of Nanofluids (JON) is an international multidisciplinary peer-reviewed journal covering a wide range of research topics in the field of nanofluids and fluid science. It is an ideal and unique reference source for scientists and engineers working in this important and emerging research field of science, engineering and technology. The journal publishes full research papers, review articles with author''s photo and short biography, and communications of important new findings encompassing the fundamental and applied research in all aspects of science and engineering of nanofluids and fluid science related developing technologies.
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