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Si-based micro pulsating heat pipes (μPHP) charged with HFE-7100 were tested at several heating powers with two orientations, θ = 0° and 90°. The width of the channel is 0.8 mm in a μPHP having uniform channels, and 1.0 mm or 0.6 mm in the other μPHP. The depth of each channel is 0.25 mm. The overall size of each μPHP is 60 mm × 10 mm × 1.25 mm. Both visual observation and temperature response of...
Optically actuated bubbles in oil were used as microrobots. Simulations of the thermocapillary fluid flow within the oil phase are used to illustrate the mechanisms driving the bubble actuation. Parallel manipulation of sub-millimeter objects including glass beads and hydrogel beads was demonstrated. These capabilities show the potential for using the bubble microrobots in biomedical or other microassembly...
A two-phase capillary evaporator has been enhanced using electrohydrodynamic (EHD) forces. The evaporator was experimentally investigated under DC applied electric field operating modes as well as without an applied electric field. The results without the applied EHD forces show that the induced flow increases with increasing applied heat loads until a dry out condition is reached. The applied DC...
An electrically driven impinging liquid jet technology is being proposed for direct cooling of electronics operating at high heat flux levels. The liquid jet flow is generated with the aid of uniquely designed electrodes immersed in a liquid bath and positioned nearby a heated wall. The jet flow is generated based on the conduction pumping phenomenon. This numerical study reveals that high impinging...
A capillary pumped loop (CPL) for the cooling of electronic apparatus was presented, and its operation principle and characteristics were analysed. This paper has pointed out the driving mechanism of the interface which is from phase change of fluid in Capillary Pumped Loop (CPL) and Loop Heat Pipe (LHP). A mathematical model has been developed to describe the driving mechanism. According to the theoretical...
Electrohydrodynamic (EHD) conduction phenomenon involves the interaction of electric field and flow field in a dielectric fluid medium via the process of dissociation and recombination of free charges. This paper numerically studies the effect of electric conduction phenomenon on the heat transfer characteristics of a Poiseuille flow. The numerical domain consists of six electrode pairs positioned...
The paper deals with optoelectrostatic pumping of conductive liquids in microchannels. In this technique the fluid is heated by the laser irradiation and exposed to an external AC electric field. If the fluid permittivity and conductivity vary with temperature the electric volume force is generated and pumping effect can be achieved. A numerical model of this phenomenon is presented and it is based...
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