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Characterization of the Micro-scale Boiling Process for FC-72
Keywords: microboiling, nucleation, FC-72
An experimental setup is used for the visualization of microboiling to better understand and characterize the boiling process for the dielectric fluid, FC-72. The relationship between the microbubble formation and the applied power, the frequency the power is applied, and the temperature of the microheater used to boil the fluid all wish to be investigated. As heat is transferred from the microheater to the fluid in a confined space, nucleate boiling and/or homogeneous boiling can occur, depending on the superheat conditions of the fluid at the microheater surface. Also, bubble nucleation time and bubble size are factors of input power conditions. Previous work has been used to help characterize the microbubble formation process for water and this work aims to find comparable results using FC-72. A 41 m x 45 m microheater from a Thermal Ink Jet (TIJ) head is used to boil the FC-72 inside a confined chamber of a few millimeters with a transparent viewing window. The microheater is driven by a circuit and the voltage, frequency, and pulse duration fed to the microheater is controlled with high precision. A flash lamp is used to illuminate the boiling process so that a CCD camera attached to microscope can capture images of the boiling process using image acquisition software. The flash lamp and the CCD camera triggers are synchronized and can be activated at controlled frequencies and nanosecond time lengths allowing for specific times in the bubbles life cycle to be captured. The images captured by the CCD camera and image acquisition software are then analyzed using image-processing software. The image processing software provides results about the position and projected area of the bubble. The power and pulse width applied to the microheater will be varied to investigate the relationship between the bubble formation and previously described parameters.
Anthony Fernandez, Student
Santa Clara University
Santa Clara, CA

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