"Since a few years, we have developed experimental benches to visualize the flow in the
capillary structure of FPHPs closed with transparent plates. Different capillary structures have
been studied (grooves with constant or variable widths, crossed grooves, figure 1) for FPHPs
made of copper or silicon. Depending on the applications, we have tested FPHPs with
different sizes and different evaporator, condenser and adiabatic areas."