EXPERIMENTAL INVESTIGATION OF THE PHENOMENON OF FROST FORMATION ON CRYOGENIC SURFACES

摘要

An experimental system for frost formation at a very low surface temperature and under natural convection conditions was set up and a series of frost deposition experiments were conducted under various environmental conditions. The wall temperature can be as low as -191.3℃. The influence of wall temperature, air temperature, humidity, and surface characteristics on the initial frost formation and the shape of crystals is investigated. Compared with the frost formation at a low wall temperature, the liquid air was first observed on the cryogenic surface before frost crystals formed, and this phenomenon was firstly found in frosted fields.