Heat Transfer Analysis in Pressurizer Tank Under Microgravity

An argued suggestion about the proper value of the heat-transfer coefficient to he assumed for describing the temperature transient in a pressurant tank under microgravity is presented. The heat-transfer coefficient to be used in a lumped mass approach to the problem is furnished via a proper Nusselt number. Transient analyses based on a continuous mass distribution or on a lumped mass approach, are compared.