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Boundary Layers and Jets > Jets
Impinging Jet Flow around a Circular Cylinder
Schematic of multiple impinging jet cooling of a cylindrical furnace containing metal melt with closed-cell pores
Metallic foams are materials which have gaseous pores inside the metal. It is lighter than conventional metal yet it retains its original mechanical strength. It is made by melting the metal in a furnace and creating bubbles to be trapped inside the metal, which is the critical process in determining the properties of metallic foams. To facilitate the bubbles being trapped inside metal, optimal cooling condition is essential, usually done by impinging jets.
Flow image showing coherent structure from curcular jet
This research is a collaborative effort with Professor Tongbeum Kim of Witwatersrand University in Johannesburg, South Africa, and it aims to physically explain the impinging jet flow around an object. First a single impinging jet on a cylinder will be experimentally investigated to obtain basic flow properties on the cylinder surface - measuring pressure distribution, heat transfer rate, and surface shear stress. Similar procedures will be performed to physically explain the flow properties of multiple jets impinging on a cylinder. Detailed flow properties thus obtained can be used to optimize the cooling rate of materials exposed to a single or multiple jets.
Heat transfer and pressure distribution of a single impinging jet on a cylinder
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