Articles Posted in the " Magnetic cooling " Category

  • CRYOGENICS—–Liquefaction of Helium and Magnetic Cooling —–SHEET 5

    CRYOGENICS—–Liquefaction of Helium and Magnetic Cooling —–SHEET 5

    CRYOGENICS—–Liquefaction of Helium, Magnetic Cooling and Nuclear demagnetization—–SHEET 5 Liquefaction of Helium by Collins’s Cryostat Principle (i)  Polytropic expansion for precooling Throttling for liquefaction. Liquifaction of helium(Fig.4) uses normal boiling liquid nitrogen for precooling before the helium enters the first cascade heat exchanger. Since helium liquefies at a lower temperature than that of even hydrogen, […]


  • * Magnetic Cooling

    * Magnetic Cooling

    MAGNETIC COOLING IT IS OBTAINED BY THE magnetisation followed by DEMAGNETISATION OF A PARAMAGNETIC SALT. It is based on the fact that there are some materials which raise their temperatures when adiabatically magnetised, and decrease their temperatures when adiabatically demagnetised. Each atom of the paramagnetic salt may be considered to be a tiny magnet. Initially […]