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Author Topic: To be deleted  (Read 18168 times)

Offline synchro1

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Re: To be deleted
« Reply #150 on: January 16, 2019, 03:24:59 PM »

Neodymium as a magnetic refrigerant:

"AbstractThe adiabatic temperature change upon magnetization, ΔTs, and the field dependent heat capacity of Nd have been measured between 5 K and 40 K in applied magnetic fils up to 7 T in order to assess its potential for use as a magnetic refrigerant in an active magnetic regenerator (AMR). The ΔTs of Nd is proportional to temperature between 4 K and 10 K, with a maximal value of 2.5 K at 7 T and 10 K. Nd thus shows some applicability to AMR use".

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Re: To be deleted
« Reply #150 on: January 16, 2019, 03:24:59 PM »

Offline synchro1

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Re: To be deleted
« Reply #151 on: January 16, 2019, 03:30:01 PM »
The material generates electrical output as JLN shows as it works to realign it's domains after the eternally applied magnetic field is removed. Polarity makes a difference.

Wikipedia:

"Adiabatic magnetization: A magnetocaloric substance is placed in an insulated environment. The increasing external magnetic field (+H) causes the magnetic dipoles of the atoms to align, thereby decreasing the material's magnetic entropyand heat capacity. Since overall energy is not lost (yet) and therefore total entropy is not reduced (according to thermodynamic laws), the net result is that the substance is heated (T + ΔTad). Isomagnetic enthalpic transfer: This added heat can then be removed (-Q) by a fluid or gas—gaseous or liquid helium, for example. The magnetic field is held constant to prevent the dipoles from reabsorbing the heat. Once sufficiently cooled, the magnetocaloric substance and the coolant are separated.


Adiabatic demagnetization: The substance is returned to another adiabatic (insulated) condition so the total entropy remains constant. However, this time the magnetic field is decreased (H = 0), the thermal energy causes the magnetic moments to overcome the field, and thus the sample cools, i.e., an adiabatic temperature change. Energy (and entropy) transfers from thermal entropy to magnetic entropy, measuring the disorder of the magnetic dipoles".



















Offline synchro1

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Re: To be deleted
« Reply #152 on: January 17, 2019, 01:51:07 PM »
Imagine the "Magnet Core Coil" positioned in the diameter of a ferrite toroid that is wrapped with copper windings to collect MEG output; Rather then pulsing a rotor with the alternating magnetic flux.








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Re: To be deleted
« Reply #152 on: January 17, 2019, 01:51:07 PM »
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Offline lancaIV

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