Makale Koleksiyonu
https://hdl.handle.net/11421/20956
2024-03-28T11:42:54ZInternal mass transfer considerations during the pyrolysis of an isolated spherical softening coal particle
https://hdl.handle.net/11421/21408
Internal mass transfer considerations during the pyrolysis of an isolated spherical softening coal particle
Sezen, Y.
[No abstract available]
1989-01-01T00:00:00ZA method for determination of chemical rate mostly encountered in coal combustion processes
https://hdl.handle.net/11421/21409
A method for determination of chemical rate mostly encountered in coal combustion processes
Sezen, Y.
[No abstract available]
1988-01-01T00:00:00ZAn investigation of heat transfer gain with introduction of graphite powder to helium gas
https://hdl.handle.net/11421/21406
An investigation of heat transfer gain with introduction of graphite powder to helium gas
Altac, Z.; Gürkan, I.
Analysis is made of heat transfer by turbulently flowing helium gas with suspended graphite particles in a circular pipe. At very high temperatures, the radiative heat to gas alone can be profoundly improved because of the large absorptivity of the cloud of fine particles. For every high temperature flow situation where radiation is the significant mode of heat transfer, there exists an optimum loading ratio (mass of graphite to that of He) and particle size for which maximum heat transfer rates are achieved. In this study, heat transfer phenomena are examined for a circular pipe with axial cosine temperature distribution and the mass of graphite, optimum particle size, and the influence of other parameters which will result in maximum heat transfer are determined. The heat transfer and flow situation are analysed for two cases. In case I, the thermodynamic parameters are averaged values of the lowest and possible highest temperatures. In case II, these parameters are temperature dependent. The governing equations for this particular system with radiation heat transfer are derived. (Authors)
1993-01-01T00:00:00ZNumerical computation of turbulent flow in pipes
https://hdl.handle.net/11421/21405
Numerical computation of turbulent flow in pipes
Karasu, T.
Developing turbulent flow in pipes of circular cross-section with length-to-diameter ratio of 100 has been computed at eight Reynolds numbers ranging from 3.8 X10 "SUP 4" to 3.88 X10 "SUP 5" . Numerical solutions of the elliptic differential equations, which incorporate standard k-epsilon turbulence model closure, are obtained using control-volume-based iterative finite-difference technique. Near the solid boundary, a wall-functions method has been employed. Numerical computations for axial velocity, turbulence kinetic energy, and wall-shear stress distributions are presented and compared with available experimental data in the literature. The results of computations are generally in good agreement with experimental measurements. (Author)
1993-01-01T00:00:00Z