Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7148

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Author: search.filters.author.Çelik, HasanScopus Q: search.filters.scopusQuartile.Q3

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  • Article
    Citation - WoS: 6
    Citation - Scopus: 7
    Effect of an Inserted Porous Layer on Heat and Fluid Flow in a Vertical Channel With Mixed Convection
    (Vinca Inst Nuclear Sci, 2015) Çelik, Hasan; Mobedi, Moghtada
    Temperature and velocity fields in a vertical channel partially filled with porous medium under mixed convection heat transfer condition are obtained. The heat transfer equation and equation of motion for clear and porous layer regions are written and solved analytically. The non-dimensionalization of the governing equations yields two Grashof numbers as Gr(c) and Gr(d) for clear and porous sections where Gr(d) = Da.Gr(c). The dimensionless governing parameters for the problem are Gr(c) (or Gr(d)), Da, thermal conductivity ratio, and thickness of porous layer. The temperature and velocity profiles for different values of Gr(c), Da, thermal conductivity ratio, and thickness of porous layer are plotted and their changes with the governing parameters are discussed. Moreover, the variation of pressure drop with the governing parameters is investigated. The decrease of porous layer thickness or thermal conductivity ratio increases the possibility of the downward flows. Thermal conductivity ratio plays important role on pressure drop, particularly for the channels with high values of Gr(c)/Re.
  • Article
    Citation - WoS: 6
    Citation - Scopus: 6
    A Study on Numerical Determination of Permeability and Inetia Coefficient of Aluminum Foam Using X-Ray Microtomography Techniques: Focus on Inspection Methods for Reliability (permeability and Inertia Coefficient by Tomography)
    (Begell House, 2019) Mobedi, Moghtada; Nakayama, Akira; Özkol, Ünver; Çelik, Hasan
    The volume-averaged (i.e., macroscopic) transport properties such as permeability and inertia coefficient of two aluminum foams with 10 and 20 pores per inch (PPI) pore density are found using microtomography images. It is shown that a comparison between the numerical values and the experimental results may not be sufficient to prove the correctness of the obtained results. Hence, in addition to traditional validation methods such as grid independency and comparison with reported results in literature, further inspections such as (a) checking the development of flow, (b) inspection of Darcy and non-Darcy regions, (c) conservation of flow rate through the porous media, (d) sufficiency of number of voxels in the narrow throats, and (e) observation of transverse velocity gradients in pores for high and low Reynolds numbers can be performed to further validate the achieved results. These techniques have been discussed and explained in detail for the performed study. Moreover, the obtained permeability and inertia coefficient values are compared with 19 reported theoretical, numerical, and experimental studies. The maximum deviation between the present results and the reported studies for 10 PPI is below 25%, while for 20 PPI it is below 28%.