This paper presents our recent work on the reconstruction of three-dimensional (3-D) flow fields in a microscale jet impingement cooling flows. We use micron-resolution PIV to capture successive two-dimensional (2-D) “slices” of the flow field in a 3-D structure, and compare with models of flow near microscale jets. This approach is specifically constructed to determine the z-component of the flow velocities, which play a key role in enhancing heat transfer at the impingement surface. These new results will enable a predictive design capability for microjet impingement cooling structures for high power electronics.

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