Научная электронная библиотека ULRICH'S Periodicals Directory

Сибирский государственный университет
науки и технологий имени академика М.Ф. Решетнева

Сибирский аэрокосмический журнал
ISSN 2712-8970 (Print) ISSN 2782-5760 (on-line)

Сведения об образовательной организации

UDK 681.3 : 536.24.08
THE STUDY OF THE FLOW IN THE VAPOUR CHANNEL OF SHORT LINEAR HEAT PIPES
A. V. Seryakov
LLC Research and Development Company “Rudetransservice” 55, Nekhinskaya Str., Veliky Novgorod, 173025, Russian Federation
The results of studies of flow of moist vapour in Laval-like vapour channels of short linear heat pipes (HPs) are presented. The increase in heat transfer coefficient of short linear HPs, intended for creation of the cooling systems of heat-stressed designs of spacecraft, is carried out by making the HPs vapour channel forms similar to the shape of the Laval-like nozzle. Comparison of the heat transfer coefficients of short HPs with the standard cylindrical vapour channel and the channel, made in the form of the Laval-like nozzle with the equality of all dimensions, flat evaporator and the same amount of the working fluid, shows that the HPs with the vapour channel in the form of the Laval-like nozzle exceeds the heat transfer characteristics of the standard HPs with a cylindrical vapour channel under high thermal loads. The study of the flow and condensation in such shaped vapour channels of the short HPs at high thermal loads gives an opportunity to analyze in detail the advantages of using such HPs and make the conclusion about the necessity of wide introduction of such HPs for the cooling systems of the spacecraft. Capacitive sensors were additionally installed in cooled top covers of the HPs, and electromagnetic pulses with a frequency of 100 kHz were supplied to them from the external generator. At heating the HPs evaporator, starting from a certain thermal power threshold value, electromagnetic pulses became modulated. It is related to the formations of the boiling process in the capillaryporous evaporator and large amount of vapour over it and its discontinuous distribution. It was discovered that the frequencies of the pulsations are more and they occur at lower values of heat load at the evaporator in the HPs with a vapour channel of a Laval-like nozzle, compared to the HPs with the standard cylindrical vapour channel with equal overall dimensions.
Heat pipes, Laval nozzle, pulsation, heat transfer coefficient.
References

1. Akachi H. Structure of Heat Pipe. US patent 1990. № 4921041.

2. Tong B. Y., Wong T. N., Ooi K. T. Closed-loop pulsating heat pipe. Applied Thermal Engineering. 2001, Vol. 21, No. 18, P. 1845–1862.

3. Naik R., Varadarajan V., Pundarika G., Narasimha K. R. Experimental Investigation and Performance Evaluation of a Closed Loop Pulsating Heat Pipe. Journal of Applied Fluid Mechanics. 2013, Vol. 6, No. 2, P. 267–275.

4. Seryakov A. V. Velocity measurements in the vapour channel of low temperature range heat pipes. International Journal of Engineering Research & Technology. 2013, Vol. 2, No. 8, P. 1595–1603.

5. Gupta A. K., Lilley, D., Sayred N. Swirling flow. New York : Wiley. 1987. 588 p.

6. Seryakov A. V. Pulsation flow in the vapour channel of low temperature range heat pipes. Direct Research Journal of Engineering and Information Technology. 2014, Vol. 2(1), P. 1–10.

7. Seryakov A. V. Pulsation flow in the vapour channel of short low temperature range heat pipes. International Journal on Heat and Mass Transfer Theory and Application. 2014, Vol. 2, No. 2, P. 40–49.

8. Seryakov A. V., Ananiev V. I., Orlov A. V. Condensation research in the short low-temperature range heat pipes. Proceedings of the 9th Minsk International Seminar of Heat Pipes, Heat Pumps, Refrigerators, Power Sources. Minsk, Belarus, 7–10 September 2015, Vol. 2, P. 168–176.

9. Seryakov A. V., Ananiev V. I. Condensation research in the short low-temperature range heat pipes. Proceedings of the VIII International Symposium on Turbulence, Heat and Mass Transfer. Sarajevo, Bosnia and Herzegovina, September 15–18 2015. Begell House Inc. P. 693–696.

10. Patent № 2431101 RF, F 28D 15/00/ Method of filling heat pipes. Seryakov A.V. Published 10. 10. 2011. Bulletin No. 28.

11. Utility model patent No. 152108. Capacitance sensor for determination of a fluid layer thickness. Seryakov A. V. Published on 27.06.2015. Bulletin No. 18/2015.

12. Seryakov A. V., Konkin А. V., Belousov V. K. Application of a jet steam nozzle in medium-temperature range heat pipes. Bulletin of Siberian State Aerospace University. 2012, iss. 1(41), P. 142–147.

13. Faghri A. Heat Pipe Science and Technology. 1995. Washington USA, Taylor and Francis. 367 p.

14. Vargaftic N. B. Spravochnick po teplophizicheskim svoistvam gasov i zhidkostey [Handbook of thermophysical properties of gases and liquids]. Moscow, Publishing house of Physico - Mathematical literature, 1963, 708 p.

15. Tables of physical values. Guide under the editorship of Kikoin I.K., the member of Academy of Science. Moscow : Atomizdat 1976. 1008 p.

16. Lee R., Reges J., Almenas K. Size and number density change of droplet populations above front during reflood. International Journal of Heat and Mass Transfer. 1984, Vol. 27, No. 4, P. 573–585.


Seryakov Arkadiy Vladimirovich – Cand. Sc., deputy director on science, senior researcher, LLC “Rudetransservice”. E-mail: seryakovav@yandex.ru .


  THE STUDY OF THE FLOW IN THE VAPOUR CHANNEL OF SHORT LINEAR HEAT PIPES