An apparatus and a system, as well as a method and article, may operate to circulate a coolant through a thermal conduit thermally coupled to a chassis heat exchange element including a plurality of receiving sections thermally coupled to a corresponding plurality of electronic devices. The temperature of one or more of the plurality of electronic devices may be sensed, and the flow rate of the coolant adjusted in accordance with the sensed temperature. The thermal conduit may include thermally conductive, flow disrupting elements. The chassis heat exchange element may operate in a downhole environment, including logging and drilling operations.