This publication is partially included in chapter IV of this thesis. The material from this source included in this thesis is not singled out with typographic means and references. 7) Ricardo LÓPEZ, Antonio LECUONA, José NOGUEIRA GORIBA, Ciro VEREDA "Effect of the order of accuracy in the singly diagonally implicit Runge-Kutta (ESDIRK) scheme in the determination of the transient void fraction and pressure drops in pipes" VII congreso de ciencias y técnicas del frío/ V congreso iberoamericano de ciencias y técnicas del frío. CYTEF