US Patent 8199505 Jet impingement heat exchanger apparatuses and power electronics modules

A jet impingement heat exchanger includes an inlet jet, a target layer, a second layer, a transition channel, and a fluid outlet. The target layer includes an impingement region and a plurality of target layer microchannels that radially extend from the impingement region. The jet of coolant fluid impinges the target layer at the impingement region and flows through the radially-extending target layer microchannels toward a perimeter of the target layer. The second layer includes a plurality of radially-extending second layer microchannels. The transition channel is positioned between the target layer and the second layer to fluidly couple the second layer to the target layer. The coolant fluid flows through the transition channel and the plurality of radially-extending second layer microchannels. The fluid outlet fluidly is coupled to the second layer. Jet impingement exchangers may be incorporated into a power electronics module having a power electronics device.