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A vapor bubble collapsing near a solid boundary in a liquid produces a liquidjet that points toward the boundary. The direction of this jet has been studiedfor boundaries such as flat planes and parallel walls enclosing a channel.Extending these investigations to enclosed polygonal boundaries, weexperimentally measure jet direction for collapsing bubbles inside a square andan equilateral triangular channel. Following the method of Tagawa and Peters(Phys. Rev. Fluids 3, 081601, 2018) for predicting the jet direction incorners, we model the bubble as a sink in a potential flow and demonstrate byexperiment that analytical solutions accurately predict jet direction within anequilateral triangle and square. We further use the method to developpredictions for several other polygons, specifically, a rectangle, an isoscelesright triangle, and a $30^{\circ}$-$60^{\circ}$-$90^{\circ}$ right triangle.

Jet direction in bubble collapse within rectangular and triangular channels