548 research outputs found

    Peristaltic transport of Johnson–Segalman fluid in a curved channel with compliant walls

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    The present investigation deals with the peristaltic flow of an incompressible Johnson–Segalman fluid in a curved channel. Effects of the channel wall properties are taken into account. The associated equations for peristaltic flow in a curved channel are modeled. Mathematical analysis is simplified under long wavelength and low Reynolds number assumptions. The solution expressions are established for small Weissenberg number. Effects of several embedded parameters on the flow quantities are discussed

    Unsteady three dimensional flow of couple stress fluid over a stretching surface with chemical reaction

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    The unsteady three-dimensional flow of couple stress fluid over a stretched surface is investigated. Analysis has been performed in the presence of mass transfer and chemical reaction. Nonlinear flow analysis is computed by a homotopic approach. Plots are presented and analyzed for the various parameters of interest. A comparative study with existing solutions in a limiting sense is made

    Synchronization of a class of fractional-order neural networks with multiple time delays by comparison principles

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    This paper studies the synchronization of fractional-order neural networks with multiple time delays. Based on an inequality of fractional-order and comparison principles of linear fractional equation with multiple time delays, some sufficient conditions for synchronization of master-slave systems are obtained. Example and related simulations are given to demonstrate the feasibility of the theoretical results

    Pool boiling heat transfer to CuO-H2O nanofluid on finned surfaces

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    © 2020 Elsevier Ltd In the present research, the general aim is to understand further the potential effect of the surface shape and geometrical specification of rectangular parallel fins developed on the surface on the heat transfer coefficient, bubble formation, and fouling of the nanoparticles. To achieve this, the boiling thermal performance of the copper oxide nano-suspension (NS) was quantified on the modified surfaces with different geometrical specifications, including the width and height of the fins and space between fins. Results showed that the designed fins reduce the rate of the fouling of the nanoparticles on the boiling surface such that the best thermal performance was achieved for the surface modified with the fins with more towering height and smaller width. Also, the fouling thermal resistance was found to follow an asymptotic behaviour while developing three regions of inception, growth, and equilibrium. During the inception of fouling, negative values were measured for the fouling thermal resistance, which was attributed to the enhancement in the specific surface area and thermal performance of the system. Overall, the presence of the fins improved the thermal performance of the system in comparison with the plain surface
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