Comparative analysis of heat transfer performance in film boiling on a superheated vertical cylinder: A detailed CFD study of water-based Al2O3 and Cu nanofluids
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引用次数: 0
Abstract
This study investigates the impact of nanoparticle types on the thermal dynamics of film boiling in water-based nanofluids, specifically focusing on nanofluids containing AlO and Cu nanoparticles along a vertical cylinder. The investigation employs the Continuous-Species-Transfer approach and also considers the effects of Brownian motion and thermophoresis. A 2D axisymmetric analysis is performed, evaluating the influence of nanoparticle type—AlO and Cu—on the boiling heat transfer efficacy. Through the examination of volume fraction, temperature distributions, nanoparticle concentration, and thermophysical characteristics, the study also examines the Nusselt number. Results show the nanoparticle enrichment at the vapor–liquid interface and the degree of this nanoparticle enrichment influences nanoparticle concentration at the cylinder wall, with higher enrichment at the interface inversely related to wall concentration. While AlO nanoparticles show higher concentration at the wall, Cu nanoparticles are more effective in enhancing Nusselt number, particularly in nanofluids with higher nanoparticle concentrations.
本研究探讨了纳米粒子类型对水基纳米流体中薄膜沸腾热动力学的影响,特别关注了含有 Al2O3 和 Cu 纳米粒子的垂直圆柱体纳米流体。研究采用了连续-物种-转移方法,还考虑了布朗运动和热泳的影响。研究进行了二维轴对称分析,评估了纳米颗粒类型--Al2O3 和 Cu 对沸腾传热效果的影响。通过对体积分数、温度分布、纳米粒子浓度和热物理特性的研究,该研究还考察了努塞尔特数。结果表明,纳米粒子在汽液界面的富集以及富集程度会影响圆筒壁上的纳米粒子浓度,界面富集程度越高,壁上的纳米粒子浓度越高,富集程度与壁上的纳米粒子浓度成反比。虽然 Al2O3 纳米粒子在壁面的富集程度较高,但铜纳米粒子在提高努塞尔特数方面更为有效,尤其是在纳米粒子富集程度较高的纳米流体中。
期刊介绍:
Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests:
Formation and synthesis of particles by precipitation and other methods.
Modification of particles by agglomeration, coating, comminution and attrition.
Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces).
Packing, failure, flow and permeability of assemblies of particles.
Particle-particle interactions and suspension rheology.
Handling and processing operations such as slurry flow, fluidization, pneumatic conveying.
Interactions between particles and their environment, including delivery of particulate products to the body.
Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters.
For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.