2017 · 11 citations · 0 references
EngineeringAerospace EngineeringMechanical EngineeringAerodynamicsFluid DynamicsHeat TransferHeat Transfer AnalysisHeat Transfer FundamentalsHeat Transfer In FluidsHeat Transfer ModelingThermal Boundary LayersThermal DesignConvective Heat TransferCooling EfficiencyCooling System EfficiencyJet ImpingementJet Impingement Heat TransferNusselt NumberThermographyWall Heat Transfer
The influence of dynamic forcing of a 7 by 7 impinging jet array on the cooling efficiency is investigated experimentally. Thereby, this work focused on determining the influence side wall induced cross flow has on the local convective heat transfer on an electrically heated target plate and on enhancing the local convective heat transfer. For the enhancement the main focus is on the influence of the impingement distance, the impingement frequency and the phaseshift between the individual rows of nozzles. Liquid crystal thermography is employed for measuring the local wall temperatures, which are used to calculate the local Nusselt numbers. The cooling efficiency of this dynamic approach is determined by comparing local Nusselt numbers with steady blowing conditions.