Cetin, Barbaros
Bayer, Özgür
In this paper. the fully-developed temperature profile and corresponding Nusselt value is determined analytically for a gaseous flow in a microtube with a thermal boundary condition of constant wall heat flux. The flow assumed to be laminar, and hydrodynamically and thermally fully developed. The fluid is assumed to be constant property and incompressible. The effect of rarefaction, viscous dissipation and axial conduction, which are important at the microscale, are included in the analysis. Second-order slip model is used for the slip-flow and temperature jump boundary conditions for the implementation of the rarefaction effect. Closed form solutions for the temperature field and the fully-developed Nusselt number is derived as a function of Knudsen number, Brinkman number and Peclet number.


Comparison of Efficiency of Two dc-to-ac Converters for Grid Connected Solar Applications
Ertan, Hulusi Bülent; Yilmaz, Arif (2012-05-26)
In this paper; requirements from grid connected photovoltaic (PV) converters are briefly reviewed. Traditional buck-converter, line-frequency transformer topology is taken as reference, which satisfies all of the requirements imposed by standards and the utility. However, this topology employs a bulky transformer. Furthermore, a large electrolytic capacitor is needed in this circuit, which is expensive and also limits the life of the converter. This is not desirable in modern applications where PV module st...
Investigation of the significance of periodicity information in speaker identification
Gürsoy, Seçil; Çiloğlu, Tolga; Department of Electrical and Electronics Engineering (2008)
In this thesis; general feature selection methods and especially the use of periodicity and aperiodicity information in speaker verification task is searched. A software system is constructed to obtain periodicity and aperiodicity information from speech. Periodicity and aperiodicity information is obtained by using a 16 channel filterbank and analyzing channel outputs frame by frame according to the pitch of that frame. Pitch value of a frame is also found by using periodicity algorithms. Parzen window (ke...
Relationship between familiarity, attitudes and preferences: Assisted living facilities as compared to nursing homes
İmamoğlu, Çağrı (Springer Science and Business Media LLC, 2006-11-01)
In this paper, the authors aim to (a) explore attitudes toward and preferences for living in the newly emerging place type of assisted living facilities in comparison to nursing homes, and (b) assess the possible impact of familiarity on those attitudes and preferences. Ninety-eight respondents (with a mean age of 62) were surveyed. Respondents were found to be more favorable toward assisted living facilities than nursing homes. A three-factor model was proposed in which attitudes mediated between familiari...
Classification of Automorphism Groups of Rational Elliptic Surfaces
Karayayla, Tolga (null; 2011-01-06)
In this paper, we give a classification of (regular) automorphism groups of relatively minimal rational elliptic surfaces with section over the field which have non-constant J-maps. The automorphism group of such a surface B is the semi-direct product of its Mordell–Weil group and the subgroup of the automorphisms preserving the zero section σ of the rational elliptic surface B. The configuration of singular fibers on the surface determines the Mordell–Weil group as has been shown by Oguiso and Shioda (...
Synthesis and thermoluminescence characterization of lithium tetraborate (Li2B4O7) doped with copper and silver metals
ÇELİK, MELİH; Yılmaz, Ayşen; YAZICI, AHMET NECMEDDİN (2017-07-01)
In this paper, dosimetric phosphor; lithium tetraborate (Li2B4O7) which has been synthesized and doped with Cu, Ag transition metals using two different synthesis methods (solution-assisted method and microwave-assisted method) and thermoluminescence characteristics of synthesized lithium tetraborate are analyzed. Synthesized Li2B4O7: Cu and Li2B4O7: Cu, Ag phosphors were characterized with X-ray Diffraction, Transmission Electron Microscopy, Scanning Electron Microscopy, and Differential Thermal Analysis t...
Citation Formats
B. Cetin and Ö. Bayer, “EVALUATION OF NUSSELT NUMBER FOR A FLOW IN A MICROTUBE USING SECOND-ORDER SLIP MODEL,” THERMAL SCIENCE, pp. 0–0, 2011, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/37849.