yes its possible but ill advised its a heat pipe heat sink for it to do its job properly it need some kind of direct airflow on it. temps would be shite otherwise. I'm assuming you know how a heat pipe setup works right???
Taken from Wikipedia
A typical heat pipe consists of a sealed pipe or tube made of a material with high thermal conductivity such as
copper or
aluminium at both hot and cold ends. A
vacuum pump is used to remove all air from the empty heat pipe, and then the pipe is filled with a fraction of a percent by volume of
working fluid (or
coolant) chosen to match the
operating temperature. Examples of such fluids include
water,
ethanol,
acetone,
sodium, or
mercury. Due to the partial vacuum that is near or below the vapor pressure of the fluid, some of the fluid will be in the liquid phase and some will be in the gas phase. The use of a vacuum eliminates the need for the working gas to diffuse through any other gas and so the bulk transfer of the vapor to the cold end of the heat pipe is at the speed of the moving molecules. In this sense, the only practical limit to the rate of heat transfer is the speed with which the gas can be condensed to a liquid at the cold end.[sup]
[1][/sup]
Inside the pipe's walls, an optional wick structure exerts a
capillary pressure on the liquid phase of the working fluid. This is typically a
sintered metal powder or a series of grooves parallel to the pipe axis, but it may be any material capable of exerting capillary pressure on the condensed liquid to wick it back to the heated end. The heat pipe may not need a wick structure if gravity or some other source of acceleration is sufficient to overcome
surface tension and cause the condensed liquid to flow back to the heated end
