Problems of sodium using in pulsating heat pipe made from fused silica Radovan Nosek, Tatiana Liptáková, Libor Trško, Zuzana Kolková, Milan Malcho and Anna Kiiljan MATEC Web Conf., 207 (2018) 04004 Published online: 18 September 2018 DOI: 10.1051/matecconf/201820704004