Exploring binary chemical reaction effects on unsteady MHD quadratic-radiative flow of tri-hybrid nanofluid over a shrinking-rotating Riga disk with multiple solutions

IF 5.2 2区 化学 Q2 CHEMISTRY, PHYSICAL
Gopinath Mandal , Dulal Pal
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Abstract

The present work investigates the influence of a binary chemical reaction incorporating activation energy and quadratic thermal radiation on the unsteady three-dimensional flow of a MoS2SiO2GO/H2O tri-hybrid nanofluid past a rotating and shrinking Riga disk under the effects of an intense magnetic field and viscous dissipation. The main objective is to examine how the inclusion of nanoparticles in the unsteady tri-hybrid nanofluid alters heat and mass transfer properties, while the rotating–shrinking Riga disk regulates the fluid flow dynamics. Through similarity transformations, the partial differential equations are reduced to ordinary differential equations and numerically solved using MATLAB’s bvp4c solver. The analysis reveals multiple solution branches, with stability assessments confirming that the upper branch is stable having a positive minimum eigenvalue, whereas the second solution produces a negative eigenvalue, showing its instability. The effects of various flow parameters on velocity, temperature, concentration, radial skin-friction coefficient, azimuthal skin-friction coefficient, Nusselt number, Sherwood number and entropy generation are examined through comprehensive numerical simulations. The results indicate that higher nanoparticle volume fractions enhance temperature and binary chemical reaction reduces concentration profiles positively. The quadratic thermal radiation parameter induces system cooling, while the unsteadiness parameter contributes to heating. A significant increase (35.09 %) in radial skin friction is observed, with a 9 % rise in the Modified Hartmann number. Quadratic radiation, nanoparticle volume fraction, and suction effects strongly influence entropy generation over the Riga disk. This research is motivated by its applications in energy-related industries and engineering, particularly in improving heat transfer in rotating machinery, such as gas turbine rotors, renewable thermal systems, and air purification technologies.
多元溶液下三杂化纳米流体在收缩旋转Riga圆盘上非定常MHD二次辐射流动的二元化学反应效应研究
本文研究了包含活化能和二次热辐射的二元化学反应对MoS2 - SiO2 - GO/H2O三杂化纳米流体在强磁场和粘性耗散作用下通过旋转和收缩的Riga圆盘的非定常三维流动的影响。主要目的是研究纳米颗粒在非定常三杂化纳米流体中的包裹如何改变传热传质特性,而旋转收缩的里加盘如何调节流体的流动动力学。通过相似变换,将偏微分方程化为常微分方程,利用MATLAB的bvp4c求解器进行数值求解。分析显示了多个解分支,稳定性评估证实了上面的分支是稳定的,具有正的最小特征值,而第二个解产生负的特征值,表明其不稳定。通过综合数值模拟考察了不同流动参数对速度、温度、浓度、径向摩阻系数、方位摩阻系数、努塞尔数、舍伍德数和熵生成的影响。结果表明,纳米颗粒体积分数越高,温度越高,二元化学反应的浓度曲线越低。二次热辐射参数引起系统冷却,非定常参数引起系统加热。观察到径向摩擦显著增加(35.09%),修正哈特曼数增加9%。二次辐射、纳米颗粒体积分数和吸力效应强烈影响里加盘上的熵生成。这项研究的动机是其在能源相关工业和工程中的应用,特别是在改善旋转机械的传热方面,如燃气轮机转子、可再生热系统和空气净化技术。
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来源期刊
Journal of Molecular Liquids
Journal of Molecular Liquids 化学-物理:原子、分子和化学物理
CiteScore
10.30
自引率
16.70%
发文量
2597
审稿时长
78 days
期刊介绍: The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.
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