D0 H-Disk Cooling Channel Fluid/Thermal Design
Each H-disk ring assembly is comprised of 24 wedge assemblies that are mounted to a ring that provides both structural support and cooling to the detector wedges. Figure 1-1 shows the general layout of a disk assembly. In order for the H-disks to operate on the same cooling system as the rest of the silicon detectors, the pressure drop must be compatible with that of the overall system design. That is, the pressure drop for which the system is to operate, which will include cooling channels for bulkheads, Fdisks, and H-disks, should yield unthrottled flowrates in each cooling device that result in acceptable fluid temperature rises due to their respective heat loads. Too low a pressure drop in any channel would either rob flow from other portions of the detector or require that a higher total flow rate be supplied by the cooling system. Too high a pressure drop would yield an unacceptably large fluid temperature rise across the H-disk ring. In order to keep the detector temperatures low, thus reducing the effect of radiation damage to the silicon, the channel design should also minimize the difference between the bulk fluid temperature and the temperature of the mounting surfaces to which the wedges are attached. This is a significant portion of the overall temperature difference between the coolant fluid and the hottest portion of the silicon. This report compares calculated pressure drops to test results measured on ring mock-ups for two different channel designs. The cross-section of the two different channels discussed here are shown in Figure 1-2. Channel A is a simple rectangle with a 1 x 16 mm cross section, while Channel B has a serpentine cross section but maintains a width of 1 mm. Channel A represents an early design concept while Channel B represents the culmination of the design evolution. The serpentine Channel B design has a larger cross-sectional area than Channel A (29 vs. 16 square mm), so it is expected to have a lower {Delta}P. Its larger surface area, while maintaining the same gap height, provides improved heat transfer performance. Both of these channels assume that the ring inlet and outlet are 180{sup o} apart with the flow evenly split between ring halves. Channel configurations that had a single 360{sup o} channel were also considered. However, in order to keep {Delta}Ps low, larger channels were required to accommodate the higher flows through the channel, and larger gap heights lead to larger fluid-to-wall temperature differences. Therefore, this option was not developed further.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1032111
- Report Number(s):
- FERMILAB-D0-EN-489; TRN: US1200476
- Country of Publication:
- United States
- Language:
- English
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