Browsing by Author "Lasbet Y."

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    Improvement of transfer phenomena rates in open chaotic flow of nanofluid under the effect of magnetic field: Application of a combined method
    (Elsevier Ltd, 2020) Aidaoui L.; Lasbet Y.; Selimefendigil F.
    Numerical investigation is carried out in the present research in order to assess the effects of a combined technique on heat transfer and fluid motion. A linking between three promoting ways to enhance transfer phenomena presented in terms of regime flow (chaotic flow), the fluid type (nanofluid) along with a non-intrusive means (magnetic induction) is considered throughout the current study. In this project, magnetohydrodynamic MHD field is applied with two different manners; either on the full geometry or partially on selected portions of the channel. Moreover, evolutions of local and average Nusselt numbers, thermal and velocity fields, average wall shear rate in addition to the flow patterns are examined for Hartmann number, Reynolds number and different scenarios of the MHD field application and direction. Findings illustrate that Nusselt number and therefore heat transfer is an increasing function with Ha number in the case of partial mode and transversal orientation of the MHD field. While it is either a constant, decreasing or slightly augmented function with Ha in the other applications. An amelioration of about 13% in heat transfer is recorded for the optimum case compared to the standard situation (without magnetic field). Besides, it is shown that Re number grows heat exchanges with an existing critical value of Re for the transversal orientation case, where the effect of the MHD mode on the average Nu number is differently. © 2020 Elsevier Ltd
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    Effect of simultaneous application of chaotic laminar flow of nanofluid and non-uniform magnetic field on the entropy generation and energetic/exergetic efficiency
    (Springer Science and Business Media B.V., 2022) Aidaoui L.; Lasbet Y.; Selimefendigil F.
    This work aims to characterize the heat exchange system efficiency and entropy generation of nanofluid forced convection flow with chaotic perturbations influenced by a non-uniform magnetic field. The study investigates numerically the effects of combined passive/active methods presented in terms of chaotic advection, nanoparticles and non-uniform magnetic field on the fluid flow performances. Adopted parameters for the characterization are the convection heat transfer coefficient, field synergy principle, entropy production and efficiency according to the first and second law of thermodynamics. Several parameters were used to evaluate the current study, such as Hartmann and Reynolds numbers, concentration of nanoparticles as well as the mode of application and orientation of the magnetic field. The main results show that the co-effect of the magnetic intensity (Ha), its orientation (transversal) besides with its application mode (partial) stimulate the performance of such energy systems. Furthermore, the production of entropy in laminar regime is due only to the thermal irreversibilities, while the produced ones by friction and magnetic field are insignificant. Using the second law of thermodynamics, exergetic efficiency is dominated by heat transfer since the first law of thermodynamics overestimates the pressure drops in the flow. © 2021, Akadémiai Kiadó, Budapest, Hungary.