Optimization of thermocapillary-driven melting in trapezoidal and triangular geometry in microgravity

•Analysis of thermocapillary-driven melting in microgravity in different geometries.•In trapezoids resulting from inclining the cold wall, melting can be accelerated by a factor of 3 with respect to the rectangular case.•In trapezoids results from inkling the hot wall, melting is characterized by a weak diffusive region that slows down the melting process.•A study on the effect of the aspect ratio Γ suggests that melting times scale with Γ-1.25 for a fixed PCM volume.