Using CFD to improve the performance of a heat exchanger from a gasifier Liliana Dumitrescu, Edmond Maican, Ioan Pavel, Cătălin Dumitrescu, Iuliana Găgeanu and Andrei Pătruț E3S Web Conf., 286 (2021) 01010 Published online: 12 July 2021 DOI: 10.1051/e3sconf/202128601010