Fluid flows, Thermal engineering
stabilizing cooling flow – prevent cavitation with inserts.
Liquid cooling systems run into the risk of cavitation when high flow speeds are required. This study shows experimental and numerical data on using inserts downstream of critical components, to successfully remove the cavitation risks. This is a great option when the downstream pressure cannot be controlled.
Stabilizing a cooling flow
The design of such an insert is not trivial as it has to meet the following requirements: It must prevent cavitation near region X, it must not cause cavitation itself, it must allow the cooling flow to continue and it must be (relatively) cost effective to manufacture.
Preventing cavitation can be achieved by increasing the downstream pressure of the system. A well designed converging insert increases the pressure upstream of the insert, removing the risk of cavitation near the important parts of the system. To prevent cavitation and choked flow caused by the insert itself, the design should theoretically not have pressure decreases near a wall, but instead in the fluid layer. This will allow for a circulation of the cooling liquid, preventing a local pressure decrease. The red circles in the figure mark the risk area for a poorly designed insert, in which the point with the lowest static pressure is close to the wall. If this point is located in the liquid behind the nozzle, the low pressure can be prevented through circulation of the liquid.
To validate this concept, two insert designs are taken and compared numerically as well as experimentally. For both designs, a CFD simulation was setup and compared to an representative experiment.
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