Characteristics of the Freezing Heat Transfer of Layered Air-Water Flow in a Circular Tube

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This paper describes the experimental results of the characteristics of the freezing heat transfer of layered air-water flow in a circular tube, in which cooled air and water co-flow. The experiments were carried out under a variety of conditions of water velocity, water temperature, tube wall temperature, and air temperature. Special attention was focused on photographic visual observations of the developing ice layer along the tube wall. Two different regions characterizing the ice formation were observed, one of which was the freeze-off region, and the other was the steady-state region. It was found that the criterion between the regions was described by the equation θ_c=1.92×10^-1Re_W^0.35. The onset of freeze-off was also accurately predicted by the equation F₀=7.43×10^-1Re_W^0.14Re_a^-0.03θ_c^-1.01.