Ultrasound thermometry in transparent and opaque fluids |
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Authors: | S?Fife Email author" target="_blank">C?D?AndereckEmail author S?Rahal |
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Institution: | (1) Department of Physics, The Ohio State University, Columbus, OH 43210, USA;(2) Department of Mechanical Engineering, University of Batna, Batna, Algeria |
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Abstract: | We have exploited the temperature dependence of sound velocity to measure the thermal fields in transparent and opaque fluids. A chamber containing glycerol undergoing Rayleigh–Bénard convection was probed with an ultrasound transducer operating in the pulse-echo mode. The times-of-flight for the ultrasound pulse to traverse the fluid at several transducer locations were converted into a temperature profile that is in qualitative agreement with simultaneous thermochromic liquid crystal visualization of the flow pattern. Temperature profiles in a mercury-filled stainless steel chamber have also been obtained, both for quiescent and turbulent flows, thereby validating the ultrasound thermometry concept for opaque fluids as well. |
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