4 research outputs found
Computational investigation of the velocity and temperature fields in corrugated heat exchanger channels using RANS based turbulence models with experimental validation
No full textÖzçelik, Güven (Arel Author)The characteristics of convective heat transfer and friction factor for periodic corrugated channels are investigated numerically. In the numerical study, the finite volume method (FVM) is used. Three different Reynolds averaged numerical simulation (RANS) based turbulent models, namely the k-omega, the shear stress transport (SST) model and the transition SST model are employed and compared with each other. Experimental results obtained from a previous study are used for the assessment of the numerical results. Investigations are performed for air flowing through corrugated channels with an inclination angle of 30 degrees. The Reynolds number is varied within the range 2,000 to 11,000, while keeping the Prandtl number constant at 0.70. Variations of the Nusselt number, Colburn factor, friction factor and goodness factor with the Reynolds number are studied. Effects of the corrugation geometry and channel height are discussed. The overall performances of the considered turbulence model are observed to be quite similar. The SST model is observed to show a slightly better overall performance
The effect of cold- and warm-core eddies on the distribution and stoichiometry of dissolved nutrients and enhancement of primary production and changes in elemental composition of phytoplankton in a cold-core eddy in the Eastern Mediterranean,
No full textProduction of poly(vinyl alcohol)/Nafion (R) nanofibers and their stability assessment for the use in direct methanol fuel cells
No full textThe aim of this study is to investigate the electrospinning of Nafion (R) nanofibers with poly(vinyl alcohol) (PVA) as a carrier polymer and to assess the thermal and chemical stability of resultant PVA/Nafion (R) nanofibers for the use in direct methanol fuel cells, in simulated conditions. Bead-free PVA/Nafion (R) nanofibers were produced using higher molecular weight PVA. Resultant PVA and PVA/Nafion (R) nanofibers were stabilized using two different methods which are BTCA crosslinking and thermal stabilization, followed by sulfonation of the PVA part. FT-IR analysis demonstrated that the membranes were stabilized and sulfonated successfully. Thermal, water, methanol and oxidative stability of the membranes were tested in addition to ion-exchange capacity. Morphological changes in the structure were analyzed using SEM analysis. Thermally stabilized PVA/Nafion (R) nanofibrous membrane was found to be stable against water, methanol and oxidative effects. The nanofibrous structure was well preserved after treatments, while the other membranes became a film-like material. Thermal stability of the PVA/Nafion (R) nanofibrous membrane was similar to that of commercial Nafion (R) 115 membrane up to 200celcius.Ege University Scientific Research Projects Coordination UnitEge University [16-MUH-042]The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by Ege University Scientific Research Projects Coordination Unit (Project Number: 16-MUH-042)
Translation and westernisation in Turkey (from the 1840s to the 1980s)
No full textThis thesis examines the role and function translations played in Turkish history,
especially within the framework of its Westernisation movement from the mid-nineteenth
to the late twentieth centuries. A descriptive approach is adopted, aiming to identify
cultural patterns which shape and reflect translational decisions and help to a better
portrayal of the socio-cultural context of translation during the time span examined. To
this end, the thesis seeks to describe in detail historical, political, literary and linguistic
factors which have affected the translation activity.
The main assumption of this thesis is that acculturation was used as the main
strategy in translations from Western languages during the periods which were marked
with an extensive translation activity, especially during the nineteenth century and the first
decades of the Republican era. This acculturation strategy not only helped to enrich the
target literary system, bringing new literary models (genres), new subject matter,
developing the language and giving rise to a new Turkish literature, it also had an effect
upon the broader socio-cultural polysystem, especially on the process of identity creation.
The analysis of the social, political and cultural conditions and policies suggests
that the status given both to the source and target cultures has been the main factor for the
acculturation. As examined in the last part of the thesis, a shift of power relations in the
Turkish context, especially after the 1980s, marked a new kind of an acculturation
strategy and a certain movement of resistance.
The thesis concludes that there is need to know more about different translation
histories in order to learn more about the acculturation process and to move beyond a
Eurocentric view, and an interdisciplinary approach should be taken for such research
