Estudo Geralhttps://estudogeral.sib.uc.ptThe DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Tue, 26 May 2020 04:31:48 GMT2020-05-26T04:31:48Z5031Wave scattering by infinite cylindrical shell structures submerged in a fluid mediumhttp://hdl.handle.net/10316/3999Title: Wave scattering by infinite cylindrical shell structures submerged in a fluid medium
Authors: Godinho, L.; Tadeu, A.; Branco, F. J.
Abstract: This work analyzes the wave scattering by an elastic, fluid-filled, cylindrical shell structure submerged in a fluid medium and subjected to the effect of a point pressure load placed inside or outside the cylindrical shell. The shell structures modeled have constant cross-sections along their axis, corresponding to 2.5D problems. A Fourier transformation in the direction in which the geometry does not vary is applied to find the 3D field as the summation of the 2D solutions for different spatial wavenumbers.
Wed, 01 Jan 2003 00:00:00 GMThttp://hdl.handle.net/10316/39992003-01-01T00:00:00ZA dimensionless analysis of radial heat conduction with variable external convection boundary conditionshttp://hdl.handle.net/10316/4293Title: A dimensionless analysis of radial heat conduction with variable external convection boundary conditions
Authors: Branco, J. F.; Pinho, C. T.; Figueiredo, R. A.
Abstract: Radial heat conduction in insulated pipes under external convection is usually dealt with great detail in several heat transfer publications. However, an analysis carried out through the graphical representation of the dimensionless characteristic parameters, will allow a better understanding of the phenomenon. Here the dependence of the convection coefficient on the external radius and external surface temperature, typical of forced and free convection, is taken into account. Assuming a power law variation of the convection coefficient [1] and using the results of Sparrow [2], all the important dimensionless parameters, including the critical radius, are explicitly represented and compared with those arising in the case of the insulated sphere [3].
Mon, 01 Jan 2001 00:00:00 GMThttp://hdl.handle.net/10316/42932001-01-01T00:00:00ZHeat conduction in the hollow sphere with a power-law variation of the external heat transfer coefficienthttp://hdl.handle.net/10316/4297Title: Heat conduction in the hollow sphere with a power-law variation of the external heat transfer coefficient
Authors: Branco, J. F.; Pinho, C. T.; Figueiredo, R. A.
Abstract: The conduction phenomenon in an insulated sphere is re-worked through a dimensionless approach, where the heat transfer coefficient dependence on the external radius and on the surface temperature, as in the case of forced and free convection, is taken into account. Assuming a power law variation of the convection coefficient [1, 2], and using the results of Sparrow [3], equations and graphs for the most important dimensionless parameters are presented. The developed equations show, for example, that as the insulation thickness increases the heat transfer rate tends to a positive value, independent of the considered case: constant convection coefficient, forced or free convection.
Sat, 01 Jan 2000 00:00:00 GMThttp://hdl.handle.net/10316/42972000-01-01T00:00:00Z