The thermal characteristics of a closed two-phase thermosyphon at low temperature difference
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Cited by (25)
Experimental study on the startup and heat transfer behaviors of a two-phase closed thermosyphon at subzero temperatures
2022, International Journal of Heat and Mass TransferCitation Excerpt :The startup temperature difference is also a key factor to affect the working performance of a TPCT at different inclination angles. Li et al. [32] experimentally explored the minimum temperature differences required to initiate and sustain boiling; it is found that artificial triggering may increase the long-term benefits of the heat exchangers for vertical TPCTs with different fluids in the evaporator section. Zhang et al. [33] observed a peculiar start-up phenomenon composed of two start-up scenarios at adverse elevations for loop heat pipes (two-phase heat transfer devices).
Heat transfer and hysteresis characteristics in an elbow thermosyphon
2021, Thermal Science and Engineering ProgressCitation Excerpt :The change in the superheat for the upper or film region (Fig. 8(b)) shows evidence of two different behaviors; one that is consistent with film evaporation at low heat fluxes and one with substantively better performance at higher heat fluxes. The results at lower heat fluxes show a significant hysteresis that was responsible for much of the hysteresis in the overall performance in Fig. 4, unlike previous results where the hysteresis in the overall evaporator performance is typically attributed to the delay in the onset of boiling in the pool region [34,35]. The average wall superheat in the film region was larger than that for the film evaporation model [10] given in Table 4 for heat fluxes up to approximately 4 W/cm2 particularly for the 10 °C cooling water temperature when the heat transfer was increased.
Computational fluid dynamics model for a variable conductance thermosyphon
2021, Case Studies in Thermal EngineeringHeat transfer characteristics of two-phase closed thermosyphons modified with inner surfaces of various wettabilities
2019, International Communications in Heat and Mass TransferCitation Excerpt :Ong and Hamlaoui [12] studied the thermal performance of thermosyphons using water and R134a as filling liquids. Li et al. [13] experimentally studied the steady-state thermal performance of a vertical TPCT at low temperature differences with R11, R22 and water as working fluids. Lataoui and Jemni [14] carried out an experimental study on a stainless steel TPCT to test the effects of filling ratio, input heat flux at the evaporator and cooling fluid temperature at the condenser on its heat transfer characteristics.
Experimental and numerical investigation of using pulsating heat pipes instead of fins in air-cooled heat exchangers
2019, Energy Conversion and ManagementCitation Excerpt :Several fluids can be considered appropriate for the specified temperature range. After reviewing numerous studies [30,41–57] on PHPs application at low-temperature ranges, it was determined that a number of working fluids can be used and R22, R11, R134a, and acetone seemed to be suitable choices for the working fluid of the PHPs. Since the experiments in the previous studies have been performed in different circumstances, in order to choose the best working fluid, the performance of several working fluids in the same conditions was assessed.
Experimental investigation of a two-phase closed thermosyphon charged with hydrocarbon and Freon refrigerants
2017, Applied EnergyCitation Excerpt :For operating conditions in the medium temperature region, purified water is usually recommended as the preferred working fluid. However, in some applications, water is not suitable for its low operating pressure and high freezing temperature [20]. Freon refrigerants, methanol, ammonia, CO2, etc. have been explored as working fluids of TPCTs in low to medium temperature regions.