THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

online first only

Heat exchange crisis in mesh structures of power plant equipment

ABSTRACT
Thermal devices with porous structures, intended for the combustion chambers of gas turbine units, as well as for cutting and boring of the turbine housings of electric power plants have been developed and studied. Photographs of combustion chambers and nozzles, studied in terms of their geometry and thickening of the nozzle walls, excess oxidant (0.3÷0.8) and the operating conditions until the limit state of the metal is reached (1×106 W/m²) have been presented. The optimal geometry of the chambers and nozzles, as well as the type of porous structure have been determined. Coolant consumption has been reduced dozens of times, which has environmental significance. The appraisal of the structures studied showed the advantages to the flow cooling system. An analytical model of the heat exchange crisis is proposed. The system of differential equations for one-dimensional flow of one-phase liquid is solved. A physical picture of the heat exchange process is presented. In the equation of motion, the coefficient which determines the viscosity in the general pressure gradient is introduced. The actual velocity of the fluid is accounted for by the coefficient of moisture content in the porous structure.
KEYWORDS
PAPER SUBMITTED: 2021-03-14
PAPER REVISED: 1970-01-01
PAPER ACCEPTED: 2021-09-09
PUBLISHED ONLINE: 2021-11-06
DOI REFERENCE: https://doi.org/10.2298/TSCI210314305G
REFERENCES
  1. Shoukat alim Khan, Nurettin Sezer, Muammer Koç. Design, fabrication and nucleate pool-boiling heat transfer performance of hybrid micro-nano scale 2-D modulated porous surfaces. Applied Thermal Engineering, Volume 153, 5 May 2019, Pages 168-180. doi.org/10.1016/j.applthermaleng.2019.02.133
  2. Wei Wang, Jianmin Gao, Xiaojun Shi, Liang Xu. Cooling performance analysis of steam cooled gas turbine nozzle guide vane. International Journal of Heat and Mass Transfer, Volume 62, July 2013, Pages 668-679. doi.org/10.1016/j.ijheatmasstransfer.2013.02.080
  3. Xing Yang, et at. Turbine platform phantom cooling from airfoil film coolant, with purge flow. International Journal of Heat and Mass Transfer, Volume 140, September 2019, Pages 25-40. doi.org/10.1016/j.ijheatmasstransfer.2019.05.109
  4. Genbach A.A., Bondartsev D.Yu., Iliev I.K. Thermal Science, 2019, Volume 23, Issues 2, Pages 849 - 860. doi.org/10.2298/TSCI171016139G
  5. Genbach A.A., Bondartsev D.Yu., Iliev I.K., Georgiev A.G. Scientific method of creation of ecologically clean capillary-porous systems of cooling of power equipment elements of power plants on the example of gas turbines. Energy, 199 (2020), 117458. doi.org/10.1016/j.energy.2020.117458
  6. Genbach A.A., Bondartsev D.Y. Limiting thermal state of capillary-porous power-plant components. Russian Engineering Research, 40(5), 384-389 (2020). doi.org/10.3103/S1068798X20050093
  7. Genbach А, Bondartsev D and Beloev H 2021 A study of thermal devices with porous coatings, 2021 IOP Conf. Ser.: Mater. Sci. Eng. 1032 012039. doi.org/10.1088/1757-899X/1032/1/012039
  8. Riadh Boubaker, Vincent Platel. Dynamic model of capillary pumped loop with unsaturated porous wick for terrestrial application. Energy, Volume 111, 15 September 2016, Pages 402-413. doi.org/10.1016/j.energy.2016.05.102
  9. Mieczyslaw E. Poniewski. Peculiarities of boiling heat transfer on capillary-porous coverings. International Journal of Thermal Sciences, Volume 43, Issue 5, May 2004, Pages 431-442. doi.org/10.1016/j.ijthermalsci.2003.10.002
  10. Kimihide Odagiri, Hosei Nagano. Investigation on liquid-vapor interface behavior in capillary evaporator for high heat flux loop heat pipe. International Journal of Thermal Sciences, Volume 140, June 2019, Pages 530-538. doi.org/10.1016/j.ijthermalsci.2019.03.008
  11. Y.H. Chang, Y.M. Ferng. Experimental investigation on bubble dynamics and boiling heat transfer for saturated pool boiling and comparison data with previous works. Applied Thermal Engineering, Volume 154, 25 May 2019, Pages 284-293. doi.org/10.1016/j.applthermaleng.2019.03.092
  12. T.J. Chuang, Y.H. Chang, Y.M. Ferng. Investigating effects of heating orientations on nucleate boiling heat transfer, bubble dynamics, and wall heat flux partition boiling model for pool boiling. Applied Thermal Engineering, Volume 163, 25 December 2019, 114358. doi.org/10.1016/j.applthermaleng.2019.114358
  13. Jamialahmadi M., et at. Experimental and theoretical studies on subcooled flow boiling of pure liquids and multicomponent mixtures. International Journal of Heat and Mass Transfer, Volume 51, Issues 9-10, May 2008, Pages 2482-2493. doi.org/10.1016/j.ijheatmasstransfer.2007.07.052
  14. Mohammad Siraj Alam, L. Prasad, S.C. Gupta, V.K. Agarwal. Enhanced boiling of saturated water on copper coated heating tubes. Chemical Engineering and Processing: Process Intensification, Volume 47, Issue 1, January 2008, Pages 159-167. doi.org/10.1016/j.cep.2007.07.021
  15. Chen Li, G.P. Peterson, Yaxiong Wang. Evaporation/Boiling in Thin Capillary Wicks (l) - Wick Thickness Effects. Journal of Heat Transfer, Dec 2006, 128(12): 1312-1319. doi.org/10.1115/1.2349507
  16. M.A. Hanlon, H.B. Ma. Evaporation Heat Transfer in Sintered Porous Media. Journal of Heat Transfer, Aug 2003, 125(4): 644-652. doi.org/10.1115/1.1560145
  17. Chen Li, G.P. Peterson. Evaporation/Boiling in Thin Capillary Wicks (II) -Effects of Volumetric Porosity and Mesh Size. Journal of Heat Transfer, Dec 2006, 128(12): 1320-1328. doi.org/10.1115/1.2349508
  18. A.K. Das, P.K. Das, P. Saha. Performance of different structured surfaces in nucleate pool boiling. Applied Thermal Engineering, Volume 29, Issues 17-18, December 2009, Pages 3643-3653. doi.org/10.1016/j.applthermaleng.2009.06.020
  19. Mehmet Arik, Avram Bar-Cohen, Seung Mun You. Enhancement of pool boiling critical heat flux in dielectric liquids by microporous coatings. International Journal of Heat and Mass Transfer, Volume 50, Issues 5-6, March 2007, Pages 997-1009. doi.org/10.1016/j.ijheatmasstransfer.2006.08.005
  20. Mohammad Sohail Sarwar, Yong Hoon Jeong, Soon Heung Chang. Subcooled flow boiling CHF enhancement with porous surface coatings. International Journal of Heat and Mass Transfer, Volume 50, Issues 17-18, August 2007, Pages 3649-3657. doi.org/10.1016/j.ijheatmasstransfer.2006.09.011