Optimal Arrays of Pin Fins and Plate Fins in Laminar Forced Convection

Bejan, Adrian; Morega, Alexandru M.

doi:10.1115/1.2910672

Cited by 106 publications

(47 citation statements)

References 11 publications

(18 reference statements)

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“…Bejan and Morega [16] investigated, by analytical means, the optimal spacing of stacked plates which emit heat and are cooled by free-stream flow of the ambient fluid. Their work helps in defining the rationale behind the optimisation of space among heatgenerating materials.…”

Section: Introductionmentioning

confidence: 99%

Constructal multiscale cylinders rotating in cross-flow

Bello‐Ochende

Meyer

Ogunronbi

2011

International Journal of Heat and Mass Transfer

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a b s t r a c tThis work describes the effect of steady-state laminar forced convection on multiscale rotating cylinders in cross-flow. The objective was to numerically maximise the heat-transfer-rate-density from the multiscale cylinder assembly under a prescribed pressure drop. Two main configurations were studied, the first was with two different-sized cylinders aligned along the same centreline, and the second configuration was that in which the axis of rotation of the two cylinders was not on the same centreline but the leading edges of the cylinders were on the same line. In both configurations, the cylinders were subjected to two types of rotations, counter-rotation and co-rotation. Numerical solutions for stationary and rotational cylinders were solved to determine the optimum cylinder diameter, spacing and the corresponding maximum heat transfer rate density. The effects of different centres of rotation and the dimensionless pressure drop on the cylinder-to-cylinder spacing, optimal diameter of the cylinder and the maximum heat transfer rate density were reported. Results show that the optimal smaller cylinder diameter was robust with respect to the dimensionless pressure drop number, for both configurations. Results further showed that rotation was only beneficial for cylinders with the same axis of rotation and the effect was minimal when the axis of rotation is different.

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Section: Introductionmentioning

confidence: 99%

Constructal multiscale cylinders rotating in cross-flow

Bello‐Ochende

Meyer

Ogunronbi

2011

International Journal of Heat and Mass Transfer

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“…Later, the attention shifted towards obtaining higher thermal transport by modification of the flow field or the fluid itself so as to bring in the practical implementation aspects, such as enhancement of heat transfer using offset fins or employing nanofluids as the working fluid [15,16]. Nanofluids, which are engineered dilute and stable colloidal suspensions of metallic and/or ceramic nanoparticles in a conventional base fluid, exhibit thermal conductivity values ~ 20-150 % higher than the base fluids [17].…”

Section: Introductionmentioning

confidence: 99%

Particle and thermohydraulic maldistribution of nanofluids in parallel microchannel systems

Maganti

Dhar

Sundararajan

et al. 2016

Microfluid Nanofluid

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Fluidic maldistribution in microscale multichannel devices requires deep understanding to achieve optimized flow and heat transfer characteristics. A thorough computational study has been performed to understand the concentration and thermo-hydraulic maldistribution of nanofluids in parallel microchannel systems using an Eulerian-Lagrangian twin phase model.The study reveals that nanofluids cannot be treated as homogeneous single phase fluids in such complex flow domains and effective property models fail drastically to predict the performance parameters. To comprehend the distribution of the particulate phase, a novel concentration maldistribution factor has been proposed. It has been observed that distribution of particles need not essentially follow the flow pattern, leading to higher thermal performance than expected from homogeneous models. Particle maldistribution has been conclusively shown to be due to various migration and diffusive phenomena like Stokesian drag, Brownian motion, thermophoretic drift, etc. The implications of particle distribution on the cooling performance have been illustrated and smart fluid effects (reduced magnitude of maximum temperature) have been observed and a mathematical model to predict the enhanced cooling performance in such flow geometries has been proposed. The article presents lucidly the effectiveness of discrete phase approach in modelling nanofluid thermo-hydraulics and sheds insight on behavior of nanofluids in complex flow domains.2

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“…Examples of such papers include the works of Bejan and Morega (1993), Jubran et al (1993), Gerencser and Razani (1995), Kacimov and Obnosov (1997), and Bonjour et al (2003).…”

Section: Optimization Techniquesmentioning

confidence: 99%