THE DESIGN AND LINEARIZATION OF FLOW CONTROL DEVICE AND PRESSURE FORCES ON VALVE
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Date
2017-12-20Author
Challa, Penchala Sumanth Reddy
0000-0002-4161-0695
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Emerging technologies are pushing the limits by reducing the size of the nodes,
raising the heat densities of packages thereby demanding better thermal management.
The cooling power requirement increases drastically when air is used as the cooling
medium in high power density servers as air has a low heat transfer coefficient. Very
viable replacements for air as the cooling medium are water and oil. Oil is not as widely
used as it has its own disadvantages when compared to water. Water has appreciably
higher heat transfer coefficient, which helps it to remove heat from the server at a much
faster rate when compared to air. Finally, the abundant availability of water makes it the
perfect replacement for air in high power electronic systems. Another issue unique to
multichip scale modules is the uneven heat generation by various packages of the
module, usually creating localized high temperature regions called "hotspots". This issue
can be addressed by using dynamic cold plates.
Dynamic cold plates are designed to have sections isolated from each other to
cool multichip scale modules. In order to reduce pumping power for liquid cooling,
dynamic cold plates can distribute flow between various sections within the cold plate
based on cooling requirement in each section of the module. Each section of the cold
plate has a dedicated flow control device, that can sense temperature and regulate flow
rate accordingly.
This thesis presents the flow analysis of a self-regulating flow control device (FCD) designed for cooling a 160 W module. The flow control device controls flow by the use of an axially rotating butterfly valve mechanism. Linearization of the flow with respect to damper angle is studied by modifying the dimensional ratios of the rectangular cross section of the FCD. Pressure drop and flow rate characterization is done for the FCD. Effects of fluid flow on the structural integrity of the FCD as a whole is also studied.