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 5 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 17 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 5.
