A 1000mm×20mm×20mm narrow rectangular channel is built and the particles used belong to the PM2.5. Particles flow in the channel and they will deposit on the wall because of the temperature difference between the wall and the flow. The measurements of thermophoretic velocity of the particles are performed by the phase doppler anemometry (PDA). The radial velocity of the particles changes as the temperature of the flow or the mass rate of the flow is changing. Dimensional analysis is used to do with the experiment data, to get the relationship between the data. The difference between the result of the experiment and the fitting formula is less than 30%, so the formula is exact. The conclusion is of great importance for the further experiment and research and provides a new method for the PM2.5 research.

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