Observation of temperature peaks due to strong viscous heating in a dusty plasma flow

Abstract

Profound temperature peaks are observed in regions of high velocity shear in a 2D dusty plasma experiment with laser-driven flow. These are attributed to viscous heating, which occurs due to collisional scattering in a shear flow. Using measurements of viscosity, thermal conductivity, and spatial profiles of flow velocity and temperature, we determine three dimensionless numbers: Brinkman Br = 0.5, Prandtl Pr = 0.09, and Eckert Ec = 5.7. The large value of Br indicates significant viscous heating that is consistent with the observed temperature peaks.

5 pages, 2 figures, in press Physical Review Letters (2012)

References in corpus (5)

• Accurate particle position measurement from images
• Crystallization dynamics of a single layer complex plasma
• Time correlation functions and transport coefficients of two-dimensional Yukawa liquids
• Evolution of shear-induced melting in dusty plasma
• Superdiffusion in quasi-two-dimensional Yukawa liquids

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• Molecular shear heating and vortex dynamics in thermostatted two-dimensional Yukawa liquids
• Oscillation-like diffusion of two-dimensional liquid dusty plasmas on one-dimensional periodic substrates with varied widths
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• Experiment and model for a Stokes layer in a strongly coupled dusty plasma
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• Heat transport in a flowing complex plasma in microgravity conditions
• Dynamical commensuration effect in a two-dimensional Yukawa solid modulated by periodic substrates