ROTATING WAVY CYLINDER ON BIOCONVECTION FLOW OF NANOENCAPSULATED PHASE CHANGE MATERIALS IN A FINNED CIRCULAR CYLINDER

IF 2.5 4区 工程技术 Q2 ENGINEERING, MECHANICAL Journal of Porous Media Pub Date : 2024-01-01 DOI:10.1615/jpormedia.2024050696
Noura Alsedais, Sang-Wook Lee, Abdelraheem Aly
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Abstract

Numerical investigations were conducted on the bioconvection flow of nano-encapsulated phase change materials with oxytactic microorganisms in a circular annulus with a rotating wavy inner cylinder. The incompressible smoothed particle hydrodynamics method was applied to solve the governing partial differential equations for the velocity, temperature, concentration, and density of motile microorganisms. Compared with the conventional mesh–based method, this mesh-free, particle-based approach offers strong advantages in the simulation of complex problems with free surfaces and moving boundaries with large displacements. The pertinent parameters are the undulation number (N_und = 2-36), bioconvection Rayleigh number (〖Ra〗_b = 1-1000), Darcy parameter (Da = 10^(-5)-10^(-2)), length of the inner fin (L_Fin = 0.05-0.15), radius of the inner wavy cylinder (R_c = 0.05-0.25), Rayleigh number (Ra = 10^3-10^5), undulation amplitude of the inner wavy cylinder surface (A = 0.1-0.4), and frequency parameter (ω = 1-5). The results showed that the undulation number of the inner wavy cylinder enhanced the flow of the oxytactic microorganisms and isotherms, whereas it had the reverse effect on the velocity, decreasing the maximum velocity by 26.56%. In addition, the comparatively high undulation amplitude and frequency increased the average Nusselt and Sherwood numbers. It was found that the embedded wavy cylinder interacting with fins plays an important role in enhancing heat transfer and the bioconvection flow within a closed domain.
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旋转波浪形圆筒对翅片状圆筒中纳米相变材料生物对流的影响
对纳米封装相变材料与氧接触微生物在带有旋转波浪形内圆筒的环形空间中的生物对流进行了数值研究。应用不可压缩平滑粒子流体力学方法求解了运动微生物的速度、温度、浓度和密度的控制偏微分方程。与传统的基于网格的方法相比,这种无网格、基于粒子的方法在模拟具有自由表面和大位移移动边界的复杂问题时具有很强的优势。相关参数包括起伏数(N_und = 2-36)、生物对流瑞利数(〖Ra〗_b = 1-1000)、达西参数(Da = 10^(-5)-10^(-2))、内鳍长度(L_Fin = 0.05-0.15)、内波浪形圆柱体半径(R_c = 0.05-0.25)、瑞利数(Ra = 10^3-10^5)、内波浪形圆柱体表面起伏幅度(A = 0.1-0.4)和频率参数(ω = 1-5)。结果表明,内波浪形圆筒的起伏数增强了氧接触微生物的流动性和等温线,而对速度的影响则相反,最大速度降低了 26.56%。此外,相对较高的起伏幅度和频率增加了平均努塞尔特数和舍伍德数。研究发现,嵌入式波浪形圆柱体与鳍片相互作用,在增强封闭域内的热传递和生物对流方面发挥了重要作用。
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来源期刊
Journal of Porous Media
Journal of Porous Media 工程技术-工程:机械
CiteScore
3.50
自引率
8.70%
发文量
89
审稿时长
12.5 months
期刊介绍: The Journal of Porous Media publishes original full-length research articles (and technical notes) in a wide variety of areas related to porous media studies, such as mathematical modeling, numerical and experimental techniques, industrial and environmental heat and mass transfer, conduction, convection, radiation, particle transport and capillary effects, reactive flows, deformable porous media, biomedical applications, and mechanics of the porous substrate. Emphasis will be given to manuscripts that present novel findings pertinent to these areas. The journal will also consider publication of state-of-the-art reviews. Manuscripts applying known methods to previously solved problems or providing results in the absence of scientific motivation or application will not be accepted. Submitted articles should contribute to the understanding of specific scientific problems or to solution techniques that are useful in applications. Papers that link theory with computational practice to provide insight into the processes are welcome.
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