In this paper, 2D heat transfer and solidification process of a binary mixture of ammonium chloride and water in a horizontal pipeline were investigated numerically. A standard k-ε turbulent model and an enthalpy-porosity technique were used to model the turbulent flow and solidification process in a straight pipeline. The model was validated with existing experimental results for solidification process in enclosures and channels. The governing equations of the model were solved by a control volume method. The effect of pipeline wall temperature variations on the solidification process and transport characteristics were carried out. Pressure drop in the pipeline, flow area reduction due to solidification, and quantity of formed solid, were evaluated. Information about the solidification process characteristics, such as temperature distribution, liquid fraction contours, and detailed description of transient evolution of liquid-solid interface during under variant initial wall temperature were presented and discussed.
