One of ACT’s customers was interested in using spray and jet impingement cooling to remove high heat fluxes (1000W/cm2) from the surface of a CPU. A test section was designed capable of taking single jet impingement heat transfer data using Intel’s supplied 34980A thermal test platform. Figure 2 shows an overall view of the test section with the Sil-clamp bolted to the base plate. The Thermal Test Vehicle is also shown in place. The 8 bolts hold the Sil-clamp in a precise location above the base plate and also provide even pressure around the O-rings to the acrylic cylinder. Figure 1 shows the flow exiting the nozzles at the projected angle as well as the projected impact of the spray with the die. In the design process the 3-D CAD software was used to verify no flow interactions. The test apparatus was designed to test at various inlet temperatures from -10°C to 125°C and work with three different fluids (HFE-7000, Methanol, and Water). The apparatus successfully measured heat transfer coefficients at various locations along the die, provide the customer with the precise measurements required for their application; see Figure 2.
