%0 Journal Article %A Fumoto, Koji %A Ishida, Takuya %A Kawanami, Tsuyoshi %A Inamura, Takao %D 2015 %I Begell House %K pulsating heat pipe, self-rewetting fluid, visualization, liquid film %N 1-2 %P 65-76 %R 10.1615/HeatPipeScieTech.2015013430 %T EXPERIMENTAL STUDY ON PULSATING HEAT PIPE USING SELF-REWETTING FLUID AS A WORKING FLUID: VISUALIZATION OF THIN LIQUID FILM AND SURFACE WAVE %U https://www.dl.begellhouse.com/journals/4b0844fc3a2ef17f,1a2182b574217a16,731e10ed2fb99b8c.html %V 6 %X Pulsating heat pipes (PHPs) are a new type of efficient heat transfer for small devices, which were introduced in the mid-1990s by H. Akachi. PHPs can be used to cool electronics by eliminating high heat flux. In this study, flow visualization was conducted for an open-loop PHP using a high-speed camera. The PHP was composed of a glass tube with an internal diameter of 1.8 mm, heated by an electric heater and cooled by water at a constant temperature. The evaporator had 10 rotations and 20 channels. The working fluid employed was comprised of a self-rewetting fluid, water, and ethanol. The self-rewetting fluid was a dilute aqueous solution of alcohols with a large number of carbon atoms (such as butanol and pentanol). These solutions can be considered as self-rewetting fluids because such fluids display nonlinear dependence of the surface tension with temperature. The results indicated that the working fluid characteristics had a strong influence on the performance. When using self-rewetting fluid as the working fluid, the temperature of the adiabatic section was higher than that of the water. Moreover, a peculiar wavy, thin layer of water was observed on the wall of the channel. %8 2016-06-01