Abstract
In loop heat pipes (LHPs), wick materials and their structures are important in achieving continuous heat transfer with a favorable distribution of the working fluid. This article introduces the characteristics of loop heat pipes with different wicks: (i) sintered stainless steel and (ii) ceramic. The evaporator has a flat-rectangular assembly under gravity-assisted conditions. Water was used as a working fluid, and the performance of the LHP was analyzed in terms of temperatures at different locations of the LHP and thermal resistance. As to the results, a stable operation can be maintained in the range of 50 to 520 W for the LHP with the stainless-steel wick, matching the desired limited temperature for electronics of 85 °C at the heater surface at 350 W (129.6 kW·m−2). Results using the ceramic wick showed that a heater surface temperature of below 85 °C could be obtained when operating at 54 W (20 kW·m−2).
Highlights
Loop heat pipes use a passive two-phase heat transport device in which advantageous characteristics are offered, such as operation against the gravity through the capillary effect and flexible characteristics
The results showed that the larger effective thermal conductivity of wick has an influence on the overall thermal performance of the loop heat pipes (LHPs)
In the LHP with a ceramic wick, some fluctuations were found in the range of heat power, from 53 to 80 W, where the values of Tcci were higher than Tco
Summary
Loop heat pipes use a passive two-phase heat transport device in which advantageous characteristics are offered, such as operation against the gravity through the capillary effect and flexible characteristics. In an LHP system, the porous wicks’ structure is essential because it provides the capillary force for working fluid circulations, a liquid flow path, and a place for phase change heat transfer. Porosity,The pore diameter, anddifferent thermal wicks conductivity of the wicks of LHPs is tested with the designed evaporator This is a simple case study of an were measured. In this situation, wick higher than the vapor located at the compensation chamber. 8 are relative to the filtrationisof the liquid through the at thePoint expense of the working fluid The investigated evaporator design belongs to the evaporator group with opposite replenishment (EOA)
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