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. 2022 May 10;219:109166. doi: 10.1016/j.buildenv.2022.109166

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Fig. 5 — The time-varying streamwise penetration distance of the geometric centre of the expired jet estimated using the two-stage model for light activity (exhalation/inhalation rate, 0.2 L/s). The streamwise penetration distance of the starting jet $x \sim t^{\frac{1}{2}}$ and the streamwise penetration distance of the puff $x \sim t^{\frac{1}{4}}$ after the 2-s exhalation phase.