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We study acoustic streaming in liquids driven by a non-dissipative acousticbody force created by light-induced temperature gradients. This thermoacousticstreaming produces a velocity amplitude approximately 50 times higher thanboundary-driven Rayleigh streaming and 90 times higher than Rayleigh-Benardconvection at a temperature gradient of 10 K/mm in the channel. Further,Rayleigh streaming is altered by the acoustic body force at a temperaturegradient of only 0.5 K/mm. The thermoacoustic streaming allows for modular flowcontrol and enhanced heat transfer at the microscale. Our study provides thegroundwork for studying microscale acoustic streaming coupled with temperaturefields.

Fast microscale acoustic streaming driven by a temperature-gradient-induced non-dissipative acoustic body force