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New Materials

Study of the thermodynamic processes during the cooling of YBCO Blocks in LN2. IDMEC

1) Identify and validate models for verified thermodynamic processes;

2) Numerical estimation and experimental measurement of the energy and LN2 mass consumption rates.

Objectives

Work

Check our paper:

1) Antonio J. Arsenio; Rui Melicio; Carlos Cardeira; and P. J. Costa Branco, "The Critic Liquid-Gas Phase Transition between Liquid Nitrogen and YBCO HTS bulks: from FEM Modeling to Its Experimental Study for ZFC Levitation Devices," IEEE Transactions on Applied Superconductivity. DOI: 10.1109/TASC.2018.2801352

 

Main Conclusions

 

1) Due to high temperature gradients nearby the YBCO bulk boundary, there is phase change from liquid to gas during cooling stage;

2) Releasing of bubbles creates a turbulent flow with formation of vortexes above YBCO blocks;

3) The necessary time for initial cooling is almost 1 minute.

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