INFLUENCE OF THE MAIN GEOMETRIC FACTORS
DOI:
https://doi.org/10.20998/2078-774X.2016.10.20Анотація
The main criteria for the development of new highly efficient contact devices are the heat-mass exchange process intensification and the capital expenditure reduction. This scientific paper gives consideration to experimental investigation data obtained for the influence of basic geometric characteristics of vertical channels (channel height and diameter, the aperture diameter and the cross-section area of distribution grating), the influence of the methods and conditions of air supply on the hydraulic resistance of dynamic two-phase flow. It is shown that at relatively small channel diameters (Bo number < 10) the structure of two-phase flow in independent of the method of delivery of gas phase to the working channel. However, as the channel diameter is increased (the Bond number value 10 < Bo < 30) the conditions of delivery of gaseous phase influence the two-phase flow structure. To provide the uniform structure of dynamic two-phase layer in the channel cross-section it is necessary to provide the distributed supply of gas phase through the openings of distribution grating in the bubble device. A change in the height of the working section actually produces no influence on the longitudinal average gradient of total pressure losses. For the practical application of bubble apparatuses the bubble layer is recommended with operation characteristics of liquid and gaseous phase that provide minimum hydraulic resistance for the two-phase layer.Посилання
Aronov, Y. Z. (1990), Kontaktnij nagrev vody produktamy sgoranyja pryrodnogo gaza[Contactwaterheatingproductsofnatural gas exhaust], Nedra, Leningrad, Russian.
Bezrodnyj, M. K., Nazarova, І. О. and Kostyuk, O. P., Nacional'nyj Tehnichnyj Universytet Ukrai'ny "Kyi'vs'kyjPolitehnichnyjInstytut" (2007),
"Nagrivnyk tekuchoi' ridyny", Kiev, Ukraine, Patent 22852.
Omar, H. and Pohvalov, Ju. E. (2006), "Gidrodinamika i struktura dvuhfaznogo potoka pri barbotazhnom rezhime vtrubahnebol'shogo diametra [Hydrodynamics and Structure of Two-Phase Flow in the Bubbling Regime in Small-DiameterTubes]",Teplojenergetika [Thermal Engineering],no. 4, pp. 74–77, ISSN 0040-3636.
Кostyuk, О. Р. (2014), "Rezhymy techiyi dvofazovykh sumishey u protochnomu barbotazhnomu shari utylizatorateplotyvidkhidnykh haziv [Flow Modes of Two-Phase Mixtures in the Flow Bubbling Balloon of the Heat-UtilizerofReleasedGases]".Bulletinof NTU "KhPI". Series: Power and heat engineering processes and equipment, no. 12(1055),pp.163–170, ISSN 2078-774X.
Bezrodnyj, M. K., Кostyuk, О. Р., Golijad N. N., Barabash P. A. (2011), "Kontaktnyj teplomasoobmen vprotochnombarbotazhnom sloe. Chast' 1. Teplootdacha [Contact Heat and Mass Transfer in a Flowing BubblingLayer.Part1.HeatTransfer]",Promyshlennaja teplotehnika [Industrial Heat Engineering], no. 33.6, pp. 39–45, ISSN 0204-3602.
Bezrodnyj, M. K., Кostyuk, О. Р., Golijad N. N., Barabash P. A. (2012), "Kontaktnyj teplomasoobmen vprotochnombarbotazhnom sloe. Chast' 2. Massootdacha [Contact Heat and Mass Transfer in a Flowing BubblingLayer.Part2.MassTransfer]",Promyshlennaja teplotehnika [Industrial Heat Engineering], no. 34.2, pp. 33–39, ISSN 0204-3602.
Bezrodnyj, M. K., Golijad N. N., Barabash P. A., Golubєv O. B., Nazarova I. O., Кostyuk, О. Р. (2009), "Teplo- imasoviddachapry oholodzhenni parogazovoi' sumishi v protochnomu barbotazhnomu kontaktnomu aparati[Heatandmassradiationwhile cooling of vapor-gas mixture in a running bubblingcontactapparatus]",Tehnichnateplofizykatapromyslova teploenergetyka [Engineering Thermophysics andIndustrialThermalEngineering],vol. 1, pp. 34–45,ISSN 2077-1134.
Bezrodnyj, M. K., Pioro, I. L. and Kostjuk, T. O. (2005) Processy perenosa v dvuhfaznyh termosifonnyh sistemah. Teorijaipraktika [Transfer Processes in Two-Phase Thermosyphon Systems. Theory and Practicle], Fakt, Kiev, Uktaine.
Jurenev, V. N. and Lebedev, P. D. (1976), Teplotehnicheskij spravochnik [Heat Engineering a reference book], vol.2.Jenergija, Moscow, Russia.
Kutateladze, S. S. and Styrikovich, М. А. (1976), Gidrodinamika gazozhidkostnyh system [Hydrodynamics of Gas-LiquidSystems], Jenergija, Moscow, Russia.
Uollis, G. (1972), Odnomernye dvuhfaznye techenija [One-Dimensional Two-Phase Flows], Mir, Moscow, Russia.
Omar, H. and Pohvalov, Ju. E. (2007), "Parametry snarjadnogo techenija pri barbotazhnom rezhime v trubahnebol'shogodiametra [The Parameters of Slug Flow in Small-Diameter Tubes under Bubbling Conditions]", Teplojenergetika[ThermalEngineering],no. 1, pp. 58–61, ISSN 0040-3636.
Kutateladze, S. S. and Nakorjakov, V. E. (1984), Teplomassoobmen i volny v gazozhidkosnyh sistemah [Heat andMassTransfer and Waves in Gas-Liquid Systems], Nauka, Novosibirsk, Russia.
