Apparatus and methods including metal foam heat exchangers for dispersing exhaust flow are disclosed. A wearable device includes a housing having a form factor sized to be worn by a human. The housing has an exhaust port. The wearable device further includes a heat generating device carried within the housing. The heat generating device is to generate heat in operation. The wearable device further includes a metal foam heat exchanger disposed within the housing adjacent the exhaust port. The metal foam heat exchanger is to receive heat generated by the heat generating device. The metal foam heat exchanger defines multiple flow paths within the housing to disperse exhaust in multiple directions to reduce a flow velocity of the exhaust exiting the exhaust port.