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Information × Registration Number 0223U001215, 0121U109681 , R & D reports Title Heat and mass transfer and hydrodynamics in single - and multiphase media of the latest heat carriers for creating heat exchangers of cryogenic equipment and radar systems popup.stage_title Head Kravets Volodymyr Yu., Доктор технічних наук Registration Date 25-01-2023 Organization National Technical University of Ukraine "Igor Sikorsky Kyiv Polytechnic Institute" popup.description2  Designs of experimental samples of heat pipes are developed separately for each type of evaporative-condensing elements of heat transfer devices (miniature heat pipes, thermosiphons and pulsating heat pipes).In order to reduce the weight and size characteristics of real cooling systems, a range of geometric dimensions of miniature heat pipes (outer diameter from 2.0 to 6 mm, vapor space diameter from 1 mm to 4 mm, length from 150 mm to 500 mm), thermosyphons (length from 700 mm to 2000 mm, inner diameter from 3mm to 16mm) and pulsating heat pipes (inner diameter from 1mm to 3mm, number of turns from 1 to 20). A comparison of the results of modeling the thermal characteristics of the new and basic versions of the air cooling system of the transceiver module showed the high efficiency of the developed new cooling system with 16 flat heat pipes with a simplified threaded capillary structure built into the base of the radiator. The use of heat pipes made it possible to reduce the maximum temperature of active electronic components by 20.5 °C (from 78.6 °C to 58.1 °C) at a speed of cooling air in the radiator channels of 1 m/s and by 13.5 °C (from 46.9 °C to 33.4 °C) – at an air speed of 10 m/s and at the same time significantly increase the temperature uniformity of transistors of different channels among themselves. The greatest increase in transistor temperature uniformity is observed at lower air velocity values in the radiator channels. Thus, at an air speed of 1 m/s, the temperature unevenness of transistors decreases from 10.5 °С to 1.6 °С, that is, by 6.6 times. The total thermal resistance of the new cooling system at an air speed of 1 m/s decreased by 35.1% compared to the basic version, and by 50% at an air speed of 10 m/s. Product Description popup.authors Alekseik Yevheniy Serhiyovych Kravets Volodymyr Yu Melnyk Roman Nikolaienko Yurii Ye. Palamarchuk Oleksiy Rudenko Oleksandr I. Selyverstova Lubov Terekh Oleksandr M. Trokoz Yaroslav Tuz Valerii O. popup.nrat_date 2023-01-25 Close