Modulated wick heat pipe

Heat Pipe Theory and Modeling

“…2.31 Schematic of the modulated wick geometry in the evaporator and the liquid/vapor flow paths and evaporation surface (sites). The photograph of the prototype-modulated wick heat pipe is also shown [50] viscous binder of water, Polyox and Methocel, is injected inside the container to cover the inside surface of the container and the lines. The rotational rate of the container is then increased to force the slurry to level out to a uniform depth set by the thickness of sleeves attached at each end of the container.…”

“…This can provide freeze tolerance by allowing solidified working fluid to eject itself from the grooves [60]. Recent study by Hwang et al [50] shows that, in heat pipes, modulation of evaporator wick thickness provides extra cross-sectional area for enhanced axial capillary liquid flow and extra evaporation surface area, with only a moderate increase in wick superheat (conduction resistance). This modulated wick (periodic stacks and grooves over a thin, uniform wick) is analyzed and optimized with a prescribed, empirical wick superheat limit.…”

Analysis of the efficiency of air-to-air heat exchanger with a periodic change in the flow direction

“…A disadvantage of the recovery wheels is partial mixing of incoming and outgoing airflows. [30,31]. The heat exchangers of this type have low hydraulic resistance, so they can be used even at natural ventilation [32].…”

Phase change driving mechanism and modeling for heat pipe with porous wick

“…Besides, calculating examples are given for heat pipe with water as working fluid to predict its driving force and flow resistance. By applying the model presented in the paper, thermal design and calculation for heat pipe with porous wick, especially for miniature heat pipe, can be made correctly, and phase change driving mechanism of working fluid can be explained, which thereby leads to a better understanding of heat transfer limitation of heat pipe with porous wick.Heat pipe, porous wick; phase change; driving mechanism; modeling Heat pipe is a kind of heat transfer device and its operating principle is based on evaporation and condensation of working fluid [1][2][3][4][5][6][7] . Heat pipe with porous wick is a kind of heat pipe which utilizes capillary pumping forces to ensure fluid circulation [8] .…”

“…Heat pipe, porous wick; phase change; driving mechanism; modeling Heat pipe is a kind of heat transfer device and its operating principle is based on evaporation and condensation of working fluid [1][2][3][4][5][6][7] . Heat pipe with porous wick is a kind of heat pipe which utilizes capillary pumping forces to ensure fluid circulation [8] .…”