Download Amateur Telescope Making by Albert G. Ingalls PDF

By Albert G. Ingalls

Definitive publication on novice telescope making. includes plans and concept on various types. matters coated: Newtonian Telescope reflect Making; Optical trying out; Workshop knowledge; and Observatory constructions.

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It should be mentioned here, that this effect is a result of the appearance of an anisotropic change of viscosity in the fluid. For example an axial field will not hinder a rotation of the particles caused by the azimuthal component of the flow, 50 3. The magnetoviscous effect in highly diluted ferrofluids while the radial and azimuthal component are influenced. On the other hand radial and azimuthal fields will hinder – to a different amount – all three flow directions. A detailed analysis (Niklas, 1987) shows, that an axial field leads to a decrease of the axial vortex size, a radial one generates an increase while an azimuthal field does not change the wavelength of the flow at all.

6. His approach, based on a modified Chong description (Chong et al, 1971), leads to a good approximation for the viscosity, espe~ cially for high values of f . , 1998) overestimates the viscosity for low concentration but for extremely high volume concentration of the suspended particles a good description of the dependence of viscosity on volume concentration is found as shown in Fig. , 1998). From the last equation and from the data shown in Fig. 12 it becomes obvious, that extremely high volume concentration of magnetic particles leads first of all to a strong increase of zero field viscosity.

23). The circles represent experimentally obtained data from a dilution series of a kerosene based ferrofluid containing magnetite particles. 3 Viscous properties in the absence of magnetic fields 25 Higher total volume content of suspended material requires even more complicated functional relations for a proper description. 6. His approach, based on a modified Chong description (Chong et al, 1971), leads to a good approximation for the viscosity, espe~ cially for high values of f . , 1998) overestimates the viscosity for low concentration but for extremely high volume concentration of the suspended particles a good description of the dependence of viscosity on volume concentration is found as shown in Fig.

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