An apparatus including a tube to encase a fluid, a first portion of the tube disposed in a base portion of a mobile computing device, a second portion of the tube disposed in a display portion of the mobile computing device, the second portion of the tube including metal and a pump coupled to the tube and operable to circulate the fluid in the tube. A mobile computing device including a base portion; a display portion; a tube to encase a fluid, a first portion of the tube disposed in the base portion, a second portion of the tube disposed in the display portion and including metal, the base portion and the display portion coupled by a hinge; and a pump coupled to the tube and operable to circulate the fluid in the tube.