Shariff, Yasir M. (2010) Enhancement of flow boiling in meso scale channels with subsonic vibrations. Journal of Micro-Nano Mechatronics, 5 (3). pp. 93-102.
Heat transfer coefficients were measured for forced convection refrigerant mixture (R-407C) flow in meso-scale heat exchangers enhanced by subsonic vibration. Flow in three horizontal meso-channels (ID 1.0Â mm, 2.0Â mm, and 4Â mm), and a length of 60Â mm for subcooled and saturated boiling conditions are reported in this study. Experiments were conducted at heat fluxes of 2 and 11Â kW/m2 for subcooled boiling, and 15 and 29Â kW/m2 for saturated boiling. The mass flow rate was varied from 0.45 to 1.85Â kg/min. The frequency was varied, freqâ=â0â70Â Hz. An experimental setup composed of heating elements provided heat flux variations in the meso-channels and excitation elements were attached to the side of the channels to produce the subsonic vibrations. The heat transfer coefficient was found to be dependent on both the heat flux as well as mass flux levels. Results show that subsonic vibration enhanced the heat transfer performance over that of non enhanced meso-channels by 8% as compared to regular flow convective boiling process.
|Uncontrolled Keywords:||Heat transfer - Subsonic vibration - Enhancement - Meso scale|
|Subjects:||Material Science > Nanostructured materials|
|Deposited On:||21 Oct 2010 09:09|
|Last Modified:||21 Oct 2010 09:09|
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