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Małgorzata Sikora and Tadeusz Bohdal

References [1] Akers W., Deans O.K., Crosser O.K.: Condensation heat transfer within horizontal tubes. Chem. Eng. Progr. 54(1958), 89-90. [2] Akers W., Deans O.K., Crosser O.K.: Condensation heat transfer within horizontal tubes. Chemical Engineering Progress Symp. 55(1959), 171-176. [3] Bohdal T., Charun H., Sikora M.: Comparative investigations of the condensation of R134a and R404A refrigerants in pipe minichannels. Int. J. Heat Mass Tran. 54(2011), 1963-1974. [4] Bohdal T.: Investigations of

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Jan Wajs and Dariusz Mikielewicz

References [1] Collier J.G., Thome J.R.: Convection boiling and condensation, 3rd Edn. McGraw-Hill, New York 1994. [2] Mikielewicz D., Wajs J., Gliński M., Zrooga A-B.R.S.: Experimental investigation of dryout of SES 36, R134a, R123 and ethanol in vertical small diameter tubes. Exp. Therm. Fluid Sci. 44(2013), 556-564. [3] Anwar Z., Palm B., Khodabandeh R: Flow boiling heat transfer and dryout characteristics of R152a in a vertical mini-channel. Exp. Therm. Fluid Sci. 53(2014), 207-217. [4] Anwar

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Tadeusz Bohdal, Henryk Charun and Małgorzata Sikora

. COMPRESSORS’ 2009, 1-8. [4] Bohdal T., Charun H., Sikora M.: Heat transfer during condensation of refrigerants in tubular minichannels. Arch. Thermodyn. 33(2012), 2, 3-22. [5] Bohdal T., Charun H., Sikora M.: Empirical study of heterogeneous refrigerant condensation in pipe minichannels. Int. J. Refrig. 59(2015), 210-223. [6] Bohdal T., Charun H., Kuczyński W., Sikora M.: Investigation of heat exchange and flow resistances during condensation of refrigeration media in minichannels. In: Proc. 19th Int. Symp. Research

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Tadeusz Bohdal, Henryk Charun and Małgorzata Sikora

., Charun H., Sikora M.: Comparative investigations of the condensation of R134a and R404A refrigerants in pipe minichannels . Int. J. Heat Mass Transfer 54 (2011), 1963-1974. [8] Bohdal T., Charun H., Sikora M.: Heat transfer during the condensation of R134a refrigerant in pipe minichannels . In: Proc. 6th Int. Conf. on Transport Phenomena in Multiphase Systems (M.E. Poniewski, S. Alabrudziński eds.), Ryn, Poland, June 28 - July 02, 2011, 225-232. [9] Cavallini A., Doretti L., Matkovic M., Rossetto L.: Update on condensation heat

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Tadeusz Bohdal, Henryk Charun and Małgorzata Sikora

References Baroczy C. J.: Correlation of liquid fraction in two-phase flow with application to liquid metals. Chemical Engineering Progress Symposium 61 (1965), 57, 179-191. Bohdal T., Charun H., Kuczyński W., Sikora M.: Investigation of heat exchange and flow resistances during condensation of refrigeration media in minichannels. In: Proc. XIX International Symposium, Research-Education-Technology, Bremen 2009, 118-121. Bohdal T., Charun H., Sikora M.: Comparative

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Tadeusz Bohdal, Katarzyna Widomska and Małgorzata Sikora

the condensation of R134a and R404A refrigerants in pipe minichannels. Int. J. Heat Mass Trans. 54(2011), 9-10, 1963-1974. [5] Bohdal T., Charun H., Sikora M.: Experimental thermal-hydraulic characyterstics of condensation of zeotropic mixtures in canventional channels and minichannels. Chłodnictwo 6(2013), 14-19 (in Polish). [6] Bohdal T., Charun H., Sikora M.: Pressure drop during condensation of refrigerants in pipe minichannels. Arch. Thermodyn. 33(2012), 1, 87-106. [7] Bonca Z., Burtymowicz D., Targański W

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Dariusz Mikielewicz and Blanka Jakubowska

References [1] Carbon Dioxide: Air Liquide Gas Encyclopaedia, http://encyclopedia.airliquide.com/encyclopedia.asp?LanguageID=11&GasID=26 (access 4 May2016) [2] Thome J.R.: Boiling of new refrigerants: a state-of-the-art review. Int. J. Refrig. 19(1996), 7, 435-457. [3] Bergels A.E., Lienhard V.J.H., Kendall G.E., Griffith P.: Boiling and evaporation in small diameter channels. Heat Transfer Eng. 24(2003), 1,18-40. [4] Kandlikar S.G.: Fundamental issues related to flow boiling in minichannels and

Open access

Dariusz Mikielewicz and Blanka Jakubowska

-663. [7] Tibiriçá C.B., Ribatski G.: Flow boiling heat transfer of R134a and R245fa in 2.3 mm tube. Int. J. Heat Mass Tran. 53(2010), 2459-2468. [8] Satioh S., Daiguji H., Hihara H.: Correlation for boiling heat transfer of R-134a in horizontal tubes including effect of tube diameter. Int. J. Heat Mass Tran. 50(2007), 5215-5225. [9] Zhang W., Hibiki T., Mishima K.: Correlation for flow boiling heat transfer in mini-channels. Int. J. Heat Mass Tran. 47(2004), 5749-5763. [10] Kandlikar S.G., Balasubramanian P.: An extension

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Waldemar Kuczyński and Henryk Charun

Experimental investigations into the impact of the void fraction on the condensation characteristics of R134a refrigerant in minichannels under conditions of periodic instability

This paper present the results of experimental investigations of condensation of R134a refrigerant in pipe minichannels with internal diameters 0.64, 0.90, 1.40, 1.44, 1.92 and 3.30 mm subject to periodic pressure instabilities. It was established that as in conventional channels, the displacement velocity of the pressure instabilities distinctly depends on the frequency of their hydrodynamic generation. The void fraction distinctly influences the velocity of the pressure instabilities. The form of this relationship depends on the internal diameter of the minichannels and on the method of calculating the void fraction.

Open access

Tadeusz Bohdal, Małgorzata Sikora, Katarzyna Widomska and Andrii M. Radchenko

References [1] A kbar M.K., P lummer R.D., G hiaasiaan A.: On gas liquid two-phase flow regimes in microchannels. Int. J. Multiphas. Flow 29 (2003), 855–865. [2] B ohdal T., C harun H., S ikora M.: Comparative investigation of the condensation of R134a and R404A refrigerants in pipe minichannels . Int. J. Heat Mass Tran. 54 (2011), 1963–1974. [3] C avallini A., D el C ol D., D oretti L., M atkovic M., R ossetto L., Z ilio C.: Two-Phase frictional pressure gradient of R236ea, R134a and R410A inside multi-port mini-channels