An experimental investigation is conducted to study the heat transfer characteristics in convective melting of a solid particle in a flowing fluid. An ice sphere is used to represent the solid particle. This experiment serves as a basis for further improvement of numerical modeling on the convective melting of a single particle or a packed bed. The process of convective melting of an ice sphere in a horizontal, flowing water is visualized by using a digital video camera under controlled flow rate and supply water temperature. From the digital video images the shape changes of the ice sphere are measured, and the melting rate and heat transfer rate between fluid and particle is determined. A shape factor that indicates shape variation of particle in the melting process is defined. An empirical correlation that can be used to calculate the liquid-solid heat transfer coefficient in convective melting of a solid particle in a flowing fluid was obtained.