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ABSTRACT
Jet impingement heat transfer has been studied numerically for a maximum crossflow condition using a 3 × 9 array of jets. Five-hole configurations have been studied for jet average Reynolds numbers ranging from 10,000 to 20,000. Crossflow has been mitigated by varying the jet diameters in the streamwise direction to reduce the impact of crossflow on downstream jet impingement. The design criteria for all five configurations were to keep the average of the jet diameters equal to the constant jet diameter configuration (baseline). It has been found that the configuration with increasing and then decreasing jet diameters provided higher levels of heat transfer with more uniform cooling when compared to the traditional constant diameter configuration and other configurations.
Nomenclature
| CD | = | discharge coefficient |
| dj | = | jet diameter |
| = | average jet diameter | |
| h | = | heat transfer coefficient |
| L | = | nozzle length or jet plate thickness |
| Nu | = | Nusselt number based on average jet diameter |
| p* | = | plenum pressure ratio, pplenum,abs/pamb |
| = | total pressure drop from inlet of plenum to impingement channel exit | |
| q′ | = | heat flux |
| Re | = | Reynolds number based on average jet diameter |
| Tw | = | local wall temperature |
| Tplenum | = | plenum temperature |
| = | volumetric flow rate | |
| y′ | = | minimum distance between two adjacent jets in spanwise direction |
Nomenclature
| CD | = | discharge coefficient |
| dj | = | jet diameter |
| = | average jet diameter | |
| h | = | heat transfer coefficient |
| L | = | nozzle length or jet plate thickness |
| Nu | = | Nusselt number based on average jet diameter |
| p* | = | plenum pressure ratio, pplenum,abs/pamb |
| = | total pressure drop from inlet of plenum to impingement channel exit | |
| q′ | = | heat flux |
| Re | = | Reynolds number based on average jet diameter |
| Tw | = | local wall temperature |
| Tplenum | = | plenum temperature |
| = | volumetric flow rate | |
| y′ | = | minimum distance between two adjacent jets in spanwise direction |