Other
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.451p&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Other
Scientific paper
One of the important problems to be solved while designing aircrafts of various purposes is to maintain the necessary temperature inside them. Besides everything it is necessary to equalize the temperature on the surfaces of various aircraft elements for preventing their deformation. The most promising direction when solving the aforementioned problems is the application of heat pipes as an element of the design. Heat pipes are used as highly efficient heat pipe-lines that, being parts of construction elements, permit to equalize the its temperature . As a result of the experiments, it was possible to prove the possibility of using heat pipes as the means for thermostabilization process of the space vehicle. The extension of the areas of application of heat pipes and thermosyphons has resulted in operating in conditions of vibration effects. It is explained to that vibrations are inherent in some units by its nature. Such installations are the space structures, space station, rockets, air and rocket engines, vessels, other transportation facilities. It is considered, that the vibrations improve the heat and mass transfer processes. Therefore it is customary to neglect of vibration actions goes in margin of safety of action of thermal systems. Actually, in accordance with experiences, the vibrations not only improve the heat change, but also degrade it. Therefore knowledge of the impact of vibrations, intrinsic to the installation, on operational modes of used heat pipes and thermosyphons is necessary for preventing breakdown first of all. One of the way of intensification of heat and mass transfer of processes with phase transitions of working fluid is connected with synthetically created vibration actions. In this case also it is necessary to know frequency bands and amplitudes, which one improve or degrade heat and mass transfer. The research of influencing of vibrations on thermal modes with phase changes of working fluids with reference to heat pipes and thermosyphons goes by two paths. One way of research of operational modes is model of heat pipes or thermosyphons in a different variation of frequencies and amplitudes, designs, heat power, working fluid, types of capillary porous structure and so on. Another one is analysis of influencing of vibrations on processes of vaporization, boiling, condensation, flow of two-phase flows in a general formulation regardless to the particular type of a heat pipes. In the report the outcomes of researches of thermal modes of a water thermosyphons in conditions of vibration effects of different frequencies and amplitudes are presented. The boundary frequency bands and amplitude are determined, at which one heat and mass transfer in thermosyphons is improved and is degraded. For an investigated heat pipes of boundary values of frequencies are equal 60 Hz, and amplitudes are equal approximately 3 or 5 mm. The data of other authors are affirmed for another type heat pipes (they received for boundary frequencies 60 and 120-140 Hz). The outcomes of research of influencing of orientation of a heat pipes and thermosyphons on operating of vibrations are submitted. The idealised substantiation's vibration actions on heat and mass transfer of all three zones of thermal tubes - zone of vaporization, condensation and transport are given.
No associations
LandOfFree
Investigation of the Vibration Effect on the Closed Two-Phase Thermosyphon Operation does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Investigation of the Vibration Effect on the Closed Two-Phase Thermosyphon Operation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Investigation of the Vibration Effect on the Closed Two-Phase Thermosyphon Operation will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1331685