2002 Cilt 7 Sayı 1

Permanent URI for this collectionhttps://hdl.handle.net/11452/10183

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    The cramér-rao bound for damped and undamped sinusoids in gaussian noise
    (Uludağ Üniversitesi, 2002) Dilaveroğlu, Erdoğan; Uludağ Üniversitesi/Mühendislik-Mimarlık Fakültesi/Elektronik Mühendisliği Bölümü.
    A new expression for a Fisher information matrix for the problem of estimating the parameters of damped or undamped sinusoidal signals in Gaussian noise is derived for both complex and real valued time series data cases. The expression in each data case is in such a form that some relations between the Cramér-Rao bound and the signal parameters are easily seen.
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    Similarity solution of the oscillatory pressure driven fully developed flow in a channel
    (Uludağ Üniversitesi, 2002) Karagöz, İrfan; Uludağ Üniversitesi/Mühendislik-Mimarlık Fakültesi/Makine Mühendisliği Bölümü.
    Two dimensional channel flow is considered under the action of periodic oscillatory pressure field. The flow is assumed to be fully developed laminar and incompressible, so that dimensionless form of the momentum equation has been solved analytically by using similarity transformation. Variations of the velocity profiles and skin friction coefficient over a cycle have been obtained together with behavior of the flow for various oscillation frequencies. Results were also compared to numerical values of the two dimensional laminar flow equations, based on the finite volume technique.
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    A study on the thermal-entry length problem in ducts with constant surface temperature
    (Uludağ Üniversitesi, 2002) Kılıç, Muhsin; Uludağ Üniversitesi/Mühendislik-Mimarlık Fakültesi/Makine Mühendisliği Bölümü.
    In this paper a systematic procedure is introduced to deal with thermal entry length problem in tubes with constant surface temperature. Alternative relations are derived to calculate the rate of heat transfer and Nusselt number. An approximate relation between dimensionless temperature and dimensionless axial coordinate is proposed. A correlation is determined for the calculation of mean Nusselt number. Comparisons are made with available infinite series solutions. It is concluded that the proposed equations gives good results especially close the entrance region. Key Words: Thermal-entry length, Heat transfer in ducts.