Numerical and Experimental Analysis of the ZFC Heat Release from a YBCO Bulk and Validation of YBCO Thermal Parameters

This article presents results from a simple experimental methodology used to determine the amount of heat transferred an yttrium barium copper oxide (YBCO) bulk liquid nitrogen (LN2) and LN2 consumption during process zero-field cooling (ZFC). The thermal power can be determined YBCO temperature variation, which is difficult measure with accuracy. In this procedure, measured rate evaporation, considering latent heat. To reduce influence room heating make mass variation depend as much possible on released bulk, step transient into performed. precision evaporation due already cooled by ZFC. evolution at lateral surface where transfer higher also measured. measurements are compared 3D finite element analysis (FEA) numerical results. obtained evolutions validate parameters, such conductivity specific capacity constant pressure. equivalent resistance analyzing first-order lumped parameter circuit based in time LN2. characteristics dependence correlating their average time. YBCO-specific pressure then calculated dividing mass. section length toward main direction flux.