A Study Of The Flow And Heat Transfer Characteristics Of Binary Ice Slurry

Binary ice slurry is an effective coolant in cold storage and transportation. Its flow and heat transfer characteristics are the fundamental data for its use in engineering. Since mid-90s of last century, binary ice slurry has mainly been studied by foreign researchers, specifically in its rheology, viscosity, pressure drop and heat transfer. However, these researches are mostly focused on experiment. In this thesis, on the basis of summarizing the theory and experimental methods for calculating the thermal properties (density, heat conductivity, viscosity, specific heat, and etc.) of binary ice slurry, a mathematical model using the effective specific heat capacity involving the latent heat in melting ice particles has been developed. The heat transfer characteristic of binary ice slurry flowing with steady laminar or turbulent motion in a circular pipe at constant heat flux is researched, and the effects of velocity, IPF (ice packing fraction) and tube diameter on its heat transfer performance are investigated. The flow pattern and resistance of binary ice slurry in horizontal, vertical and 90 degree bend tube have also been researched, and their influential parameters are analyzed. In addition, to better understand the phase change behavior of binary ice slurry, a model for heat and mass transfer between an ice particle and its stagnant surrounding fluid is established, and its phase change process has been studied. The results reveal that the velocity and IPF are the main parameters affecting the heat transfer of binary ice slurry. Its heat transfer and flow resistance are increased with the increases in velocity and IPF, but the flow resistance is decreased with the increase in tube diameter.