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28 Nov 2011

Volume 99, Issue 22, Articles (22xxxx)

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Appl. Phys. Lett. 99, 221902 (2011); http://dx.doi.org/10.1063/1.3663578 (3 pages)

Aparna Deshpande, Kai Felix Braun, and Saw-Wai Hla
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Modeling of time-resolved coupled radiative and conductive heat transfer in multilayer semitransparent materials up to very high temperatures

M. Niezgoda, D. Rochais, F. Enguehard, P. Echegut, and B. Rousseau

Appl. Phys. Lett. 99, 224101 (2011); http://dx.doi.org/10.1063/1.3664408 (3 pages)

Online Publication Date: 28 November 2011

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This paper presents an original modeling approach that enables the calculation of the temperature field within multilayer materials submitted to the flash method. The model takes into account the time-resolved coupled conducto-radiative heat transfer and the temperature of experiments. The compound can be subdivided into as many layers as desired, and their thicknesses and relevant physical properties can be chosen arbitrarily. Unconventional experimental thermograms can be reproduced faithfully by the calculations. This model, thus, makes it possible to correctly estimate the effective thermal diffusivity of semitransparent materials, thereby providing a deeper insight into the analysis of the physical phenomena involved.
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66.70.Lm Other systems such as ionic crystals, molecular crystals, nanotubes, etc.
82.70.Gg Gels and sols

Pumping of dielectric liquids using non-uniform-field induced electrohydrodynamic flow

Wonkyoung Kim, Jae Chun Ryu, Yong Kweon Suh, and Kwan Hyoung Kang

Appl. Phys. Lett. 99, 224102 (2011); http://dx.doi.org/10.1063/1.3665403 (3 pages) | Cited 3 times

Online Publication Date: 30 November 2011

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We present a method of pumping dielectric (or non-polar) liquids. The pumping method relies on the electrohydrodynamic flow generated by field dependent electrical conductivity (Onsager effect). Adding a small amount of polar liquid increases the field-dependency of conductivity. Applying either dc or ac voltage produces a fast and regular flow around electrodes. Flow speed is proportional to cube of electric-field strength and inversely to applied frequency. The experimental results agreed well with numerical analysis based on our theoretical model.
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47.65.-d Magnetohydrodynamics and electrohydrodynamics
47.85.-g Applied fluid mechanics
77.84.Nh Liquids, emulsions, and suspensions; liquid crystals

High frequency ultrasonic imaging using thermal mechanical noise recorded on capacitive micromachined transducer arrays

Shane Lani, Sarp Satir, Gokce Gurun, Karim G. Sabra, and F. Levent Degertekin

Appl. Phys. Lett. 99, 224103 (2011); http://dx.doi.org/10.1063/1.3664775 (3 pages)

Online Publication Date: 2 December 2011

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The cross-correlation of diffuse thermal-mechanical noise recorded by two sensors yields an estimate of the ultrasonic waves propagating between them. We used this approach at high frequencies (1-30 MHz) on a capacitive micromachined ultrasonic transducer (CMUT) ring array (d = 725 μm), monolithically integrated with low noise complementary metal oxide semiconductor electronics. The thermal-mechanical noise cross-correlations between the CMUT array elements in immersion reveal both evanescent surface waves (below 10 MHz) and waves propagating primarily in the fluid (above 10 MHz). These propagating waves may allow passive imaging of scatterers closer to the array as compared to conventional pulse-echo systems, providing potentially higher resolution.
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43.58.-e Acoustical measurements and instrumentation
43.38.Hz Transducer arrays, acoustic interaction effects in arrays
85.30.Tv Field effect devices
85.85.+j Micro- and nano-electromechanical systems (MEMS/NEMS) and devices
07.07.Df Sensors (chemical, optical, electrical, movement, gas, etc.); remote sensing
07.07.Mp Transducers
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