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Arul Prakash Karaiyan

Bio: Arul Prakash Karaiyan is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topic(s): Porous medium & Convection. The author has an hindex of 2, co-authored 2 publication(s) receiving 8 citation(s). more

Topics: Porous medium, Convection, Nusselt number more
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Journal ArticleDOI
Abstract: In this analysis, forced convective heat transfer characteristics of -water nanofluid through a porous channel with several combinations of heaters and coolers is investigated numerically. The two-... more

6 citations

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01 Jan 2007-

1,836 citations

01 Jan 2005-
Abstract: The problem of laminar forced convection flow of nanofluids has been thoroughly investigated for two particular geometrical configurations, namely a uniformly heated tube and a system of parallel, coaxial and heated disks. Numerical results, as obtained for water-γAl 2 O 3 and Ethylene Glycol-γAl 2 O 3 mixtures, have clearly shown that the inclusion of nanoparticles into the base fluids has produced a considerable augmentation of the heat transfer coefficient that clearly increases with an increase of the particle concentration. However, the presence of such particles has also induced drastic effects on the wall shear stress that increases appreciably with the particle loading. Among the mixtures studied, the Ethylene Glycol -γAl 2 O 3 nanofluid appears to offer a better heat transfer enhancement than water- γ/Al 2 O 3 ; it is also the one that has induced more pronounced adverse effects on the wall shear stress. For the case of tube flow, results have also shown that, in general, the heat transfer enhancement also increases considerably with an augmentation of the flow Reynolds number. Correlations have been provided for computing the Nusselt number for the nanofluids considered in terms of the Reynolds and the Prandtl numbers and this for both the thermal boundary conditions considered more

22 citations

Journal ArticleDOI
Ying Zhang1, Yichen Huang1, Meng Xu1, Qikun Wan1  +2 moreInstitutions (2)
Abstract: Laminar mixed convection characteristics in a wall driven porous cavity with an isothermally heated square blockage inside have been investigated numerically by the Non-orthogonal multiple-relaxation time lattice Boltzmann method (MRT-LBM). Various directions of wall driven and placement of the blockage have been considered. In the current study, the geometrical and flow parameters being investigated are the directions of wall driven, blockage position (ex, ey), the Richardson number (Ri). From the analysis of the mixed convection process with different directions of wall driven, the results show that under the configuration of central placement of the blockage, the most preferable heat transfer is obtained in the right wall driven at any values of the Richardson number. Because the movement of the wall can lead to an assisting effect on the buoyancy flow in the right wall driven. Since the right wall driven has the best heat transfer effects, the influences of blockage location and Richardson number is investigated in this condition. When the value of the Richardson number is 0.1, the most preferable heat transfer is obtained when the blockage is placed at the top right and bottom right. When the value of the Richardson number is 1.0 or 10.0, both the middle left and middle right blockage placement have the best heat transfer rate. That is mainly due to the influence of the size, strength and position of the vortex, the combined effect of forced convection and natural convection is stronger when the blockage is placed at those locations. more

4 citations

Journal ArticleDOI
Ujjwal Shrestha1, Young-Do Choi1Institutions (1)
Abstract: A spiral casing is an important component of Francis hydro turbine for the even distribution of kinetic energy along the stay and guide vanes. The fluid flow around the runner is dependent on the flow condition of a spiral casing. The shape of the casing plays an important role in proper flow distribution. In this study, the optimization of the shape of a spiral casing is based on a steady-state flow analysis. Numerical optimization is performed using response surface methodology (RSM) and multiobjective genetic algorithm (MOGA). The flow uniformity and head loss in the spiral casing are selected as objectives for the optimal design of the spiral casing. The optimal design is selected from the solution acquired by RSM and MOGA. Moreover, the flow characteristics in the initial and optimal designs of the spiral casing are compared. The flow conditions in the optimal design improve significantly with the optimal design of the spiral casing. Thus, the inlet conditions for the stay vane are improved with the optimal design of the spiral casing. more

3 citations

Journal ArticleDOI
Abstract: Numerical studies on fluid flow and heat transfer through a two-dimensional 180-degree sharp bend are performed using an in-house code based on streamline upwind Petrov-Galerkin finite element meth... more

3 citations


Author's H-index: 2

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Author's top 1 most impactful journals

Heat Transfer Engineering

1 papers, 6 citations