Abstract
Next generation high-performance electronics will have large heat fluxes (>102 W/cm2) and an alternative approach to traditional air cooling is required. An attractive solution is micro-channel cooling and micro-valves will be required for refined flow control in the supporting micro-fluidic systems. A NiTi Shape Memory Alloy (SMA) micro-valve design was hydrodynamically characterized in this work to obtain the valve loss coefficient (K) from pressure measurements. The hydrodynamic characterization was important as in the flow regime of the micro-fluidic system K is sensitive to Reynolds number (Re) and geometry. Static replicas of the SMA valve geometry were studied for low Reynolds numbers (110 – 220) in a 1x1 mm CSA miniature channel. The loss coefficients were found to be sensitive to flow rate and decreased rapidly with an increase in Re. The SMA valve was compared to a similar gate micro-valve and loss across both valves was of the same order of magnitude. The valve loss coefficients obtained in this work are important parameters in the modeling and design of micro-fluidic cooling systems.
Highlights
Electronic devices are constantly evolving towards compact form factors and higher performance
A normally-closed passive Shape Memory Alloy (SMA) micro-valve design was described in previous work [1] and the developed prototype is shown in figure 1
The valve sits on an Acetal base (1) that slots into the (8x11 mm CSA) miniature-channel test-rig
Summary
Electronic devices are constantly evolving towards compact form factors and higher performance. A normally-closed passive Shape Memory Alloy (SMA) micro-valve design was described in previous work [1] and the developed prototype is shown in figure 1. For laminar flows (Re
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