Diagnostics of the temperature field of a loop heat pipe with an open compensation cavity

Heat pipes (HPs) that are widely used in various types of equipment often cannot meet the demands of new technologies. For example, they are very sensitive to their position in the gravitational field because a slight excess of the size of the evaporation zone over that of the condensation zone can drastically reduce their efficiency. Moreover, they have limited transmission capacity and heat transfer distance, which significantly reduces the field of their application. Unlike HPs, loop heat pipes (LHPs) are not subject to these drawbacks but have all major advantages of HPs. A plane LHP model with an open compensation cavity that was developed, designed and experimentally investigated at Bauman Moscow State Technical University is presented. The LHP evaporator is a brass plate with welded ribs and a wick mounted on the plate. The wick material is powder PNS-10. Experimental studies were performed to find the temperature field in a plane LHP with an open compensation cavity, which made it possible to estimate the thermal state of the heat-carrying medium in the loop.

References

[1] Kitaev A.I., Luks A.L., Poriadin A.V. Teplovye truby povyshennoi teplovoi provodimosti — kak bazovye elementy sistemy termoregulirovaniia v aerokosmicheskoi tekhnike [Using of heat-pipes with increased heat conduction as core elements of system of thermal control for aerospace equipment]. Vestnik Samarskogo gosudarstvennogo aerokosmicheskogo universiteta [Vestnik of Samara state aerospace University]. 2009, № 3(19), pp. 98–101.

[2] Maidanik Iu.F. Dostizheniia i perspektivy razvitiia konturnykh teplovykh trub [Achievements and prospects of the loop heat pipes ]. 4-ia konferentsiia po teplomassoobmenu [4th Conference on Heat and Mass Transfer]. Moscow, MPEI publ., 2006, pp. 84–92.

[3] Maidanik Iu.F. Konturnye teplovye truby — vysokoeffektivnye teploperedaiushchie ustroistva [Contour heat pipes - highly efficient heat-transfer devices]. Innovatsii [Innovation]. 2003, no. 5(62), pp. 83–86.

[4] Pastukhov V.G., Maydanik Y.F. Low-noise cooling system for PC on the base of loop heat pipes. Applied Thermal Engineering, 2007, vol. 27, issue 5–6, pp. 894–901.

[5] Singh R., Akbarzadeh A., Mochizuki M. Thermal Potential of Flat Evaporator Miniature Loop Heat Pipes for Notebook Cooling. IEEE Transactions on components and packaging technologies, 2010, vol. 33, issue 1, pp. 32–45.

[6] Yakomaskin A.A., Morskoy D.N., Afanasiev V.N. Feasibility study of loop heat pipes with flat microchannel evaporator and non-metal wick. Proc. of the 10th IHPS, Taiwan, 2011, pp. 143–146.

[7] Yakomaskin A.A., Afanasiev V.N., Zubkov N.N., Morskoy D.N. Investigation of heat transfer in evaporator of microchannel loop heat pipe. Proceedings of ASME 2012 Heat Transfer Summer Conferences 10th Int. Conf. on Nanochannels, Microchannels and Minichannels, HT 201, 2012, vol. 2, pp. 539–546.

[8] Kiseev V.M. Teplomassoperenos i fazovye prevrashcheniia v melkoporistykh kapilliarnykh strukturakh. Diss. dokt. tekh. nauk [Heat and mass transfer and phase transformations in capillary porous structures. Dr. tech. sci. diss.]. Ekaterinburg, 2001. 332 p.

[9] Zubkov N.N., Shashkov S.E. Poluchenie poverkhnostei intensivnogo kipeniia metodom deformiruiushchego rezaniia [Getting surfaces intensive boiling method of deforming cutting]. Materialy vserossiiskoi nauchno-tekhnicheskoi konferentsii «Mashinostroitel’nye tekhnologii» [Proceedings of the All-Russian Scientific and Technical Conference «Engineering Technology»]. Moscow, Bauman Press, 2008, p. 60.

[10] Zubkov N.N. Orebrenie trub teploobmennykh apparatov podrezaniem i otgibkoi poverkhnostnykh sloev [The finned tubes, heat exchangers cutting and fold the surface layers]. Novosti teplosnabzheniia [News of heat supply]. 2005, no. 4, pp. 51–53.