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- W2014206814 abstract "In general, for power and propulsion components, the bottleneck of their performance advancement is usually associated with the heat-dissipation capability. For example, rocket propulsion has been used in many different aspects of space travel and military tasks. With the higher demand today for longer-lasting and farther travel and with the extreme temperatures that these elements experience, a breakthrough technology is needed in the cooling of these thrust chambers. In this paper, the idea of using porous metallic foams is examined for their cooling-enhancement capabilities. The goal is to provide more cooling without creating additional pressure drops in the coolant passage. An experimental system was used to investigate the heat transfer enhancement and pressure drop in an annular channel filled with nickel or copper foams. The coolant used was compressed air at 1378 kPa. Constant-heat-flux heaters placed inside the inner tube of the annulus were used to simulate the heat source. Then the experiment was performed under steady state. For both the copper- and nickel-foam-filled annular channels, the heat transfer enhancement was found to be on the order of 20 times over the annular channel without porous insert for the same Darcy velocities. The pressure drop per unit channel length of the foam-filled channel is at least 2 orders of magnitude larger than that in the annular channel without porous insert; therefore, at equal pumping powers in the range of 10 to 100 W, the heat transfer enhancement of an annular metal-foam-filled channel over an annular channel without porous insert is around 3 to 4 times. When assessing the feasibility of applying the metal-foam-filled cooling channel for liquid-fueled rocket engines, we found that heat transfer enhancement ranges between 105 to 150% for equal pressure drops and mass flow rates." @default.
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- W2014206814 date "2008-07-01" @default.
- W2014206814 modified "2023-10-16" @default.
- W2014206814 title "Feasibility Study of Cooling Enhancement with Porous Metal Inserts" @default.
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- W2014206814 doi "https://doi.org/10.2514/1.33910" @default.
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