Abstract
This paper introduces a novel micro-deep, triangle-grooved wick, and compares the performance of the flat plate heat pipe (FPHP) with various types of wicks, including foam metal copper wick, sintered copper powder wick, copper mesh wick, micro-deep rectangle-grooved wick, and micro-deep triangle-grooved wick. Test results verified the feasibility of the nanofluids applied to FPHP. Tested working fluids included deionized water, Cu-water nanofluids, carbon-coated copper nanofluids and multi-walled carbon nanotube (MWCNT) nanofluids. These nanofluids were applied on foam metal FPHP and the results were compared. The results indicated that the metal foam wick is better than the other heat pipe wicks, in the contrast experiment, when the heating power is 100w, the thermal resistance is 0.1238 ℃/K. The thermal resistance of micro-deep triangle-grooved wick FPHP is 15% lower than the micro-deep rectangle-grooved wick FPHP; The optimal filled ratio of 40% can make flat heat pipe have good performance; With the increase of mass fraction of nanofluid, the thermal resistance decreased first and then increased, the best mass fraction is 0.5%, the thermal conductivity of carbon-coated copper nanofluids FPHP is optimal, the average thermal resistance is 0.1369 ℃/K, and is 17% and 9% lower than the multi-walled carbon nanofluids and copper FPHP, and is 46% lower than the deionized water FPHP; The gravitational stability of the heat pipe is verified by the experiments.
Highlights
Along with the continued demand for a rapid increase in electronic device cooling, heat dissipation components have gradually become more miniaturized
The experiment shows that when the heating power is set to 100 W, the heat pipe started sufficiently and achieve a lower temperature, so choose the heating power of 100 W to contrast the surface temperature distribution of flat plate heat pipe (FPHP). the mass fraction of all nanofluids is 0.5%, and the charging rate is 40%
As shown in the figure, when the heating power is 100 W, the maximum temperature difference of carbon-coated copper-water nanofluids, Cu-water nanofluids, multi-walled carbon nanotube (MWCNT)-water nanofluids and deionized water heat pipe on the surface is respectively 1.2, 2.8, 3.3, and 4.1◦C, the top temperature of the copper plate is nonuniform distribution, the maximum temperature difference can reach 10.4◦C, the FPHP filled of nanofluids is better than the deionized water heat pipe, and the FPHP is better than the copper plate
Summary
Along with the continued demand for a rapid increase in electronic device cooling, heat dissipation components have gradually become more miniaturized. Heat pipes for these devices must accommodate a small volume of working fluid. These pipes need to be lightweight and have high heat efficiency (Zou et al, 2016). When the work period is longer, the heat pipe size must be larger, FPHP Structure Affects Thermal Resistance causing it to lose the miniaturization advantage of heat transfer elements (Littwin and Mccurley, 1981).
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