Controllable fast self-removal of frost pieces from surfaces can effectively reduce energy consumption and residual droplets during defrosting. In this work, a tuning strategy of melting frost directional self-jumping on regular macro-patterned anisotropic superhydrophobic surface (MASS) was proposed. Under high-rate cooling condition, patterned frost on MASS with significantly different thickness distribution was observed, due to the water vapor gradient in and out of the deep grooves. During defrosting process, L-shaped melting frost on MASS shrank independently with two arms retracting inward, which further caused the melting frost's centroid/mass center to shift out of the pillar top. Partial contact with pillar tops and circular fillet introduced directional lifting force and enabled the directional self-jumping of the melting frost. Influencing factors on directional self-jumping of melting frost on MASS were also discussed. Utilizing macro-patterned anisotropic structure, the frost splitting process and its jumping direction were both tuned, which could promote the self-jumping of melting frost and thus improve the efficiency of defrosting.

可控的快速自表面除霜，可有效减少除霜过程中的能耗和残留的液滴。在这项工作中，提出了在规则的宏观图案各向异性超疏水表面（MASS）上融化霜定向自跳的调整策略。在高速冷却条件下，由于进深槽中的水蒸气梯度，在MASS上观察到图案化的霜具有明显不同的厚度分布。除霜过程中，MASS上的L形融化霜独立收缩，两只手臂向内缩回，这进一步导致融化霜的质心/质心从柱顶移出。与支柱顶部和圆形圆角的部分接触引入了方向性的提升力，并实现了融化霜的方向性自跳。还讨论了影响MASS融化霜定向自跳的因素。利用宏观模式的各向异性结构，不仅可以调节霜的分裂过程和跳跃方向，而且可以促进融霜的自跳跃，提高除霜效率。