By Annie Goetzinger, Pierre Christin

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Additional resources for Agence Hardy, Tome 5 : Berlin, zone française

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Thermodynamics was mainly developed using empirical postulates and later on explained using the kinetic theory. Its theoretical foundations rely on the physics branch of the statistical mechanics. The properties dealt with in thermodynamics are average properties of the system under study. Heat transfer, on the other hand, is the sub-field of thermodynamics that describes the exchange of thermal energy by heat dissipation. The thermodynamic state of a system is defined by specifying values of a set of measurable properties sufficient to determine all other properties.

This partially explains certain effects found in EM pumps during the start-up and shut down periods. 6), is written dimensionless by the introduction of scale variables and as a function of what is called the magnetic Reynolds number, Rm = µσ Lu0, where u0 is the mean velocity and L the characteristic length. A relatively small Rm generates only small perturbations on the applied field; if Rm is relatively large then a small current creates a large induced B field. For small magnetic Reynolds numbers (Rm <<1), the magnetic field will be dominated by diffusion and perturbative methods can be used accurately.

But when the end effects are included the pump efficiency has to be computed using numerical integration. 7). One last comment regarding the skin effect of the induced currents: the width of the fluid channel in the ALIPs and other types of electromagnetic pumps should be limited to below the skin depth of the fluid for stable operation. 7 Comparison of pump efficiencies between two cases with and without end effects when the pump operates with different flow velocities expressed in terms of the slip.

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Agence Hardy, Tome 5 : Berlin, zone française by Annie Goetzinger, Pierre Christin
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