Comparative study of flow condensation in conventional and small diameter tubes

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Abstract

Flow boiling and flow condensation are often regarded as two opposite or symmetrical phenomena. Their description however with a single correlation has yet to be suggested. In the case of flow boiling in minichannels there is mostly encountered the annular flow structure, where the bubble generation is not present. Similar picture holds for the case of inside tube condensation, where annular flow structure predominates. In such case the heat transfer coefficient is primarily dependent on the convective mechanism. In the paper a method developed earlier by the first author is applied to calculations of heat transfer coefficient for inside tube condensation. The method has been verified using experimental data from literature on several fluids in different microchannels and compared to three well established correlations for calculations of heat transfer coefficient in flow condensation. It clearly stems from the results presented here that the flow condensation can be modeled in terms of appropriately devised pressure drop.

[1] Bohdal T., 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.

[2] Breber G., Palen J.W., Taborek J.: Prediction of horizontal tubeside condensation of pure components using flow regime criteria. Trans. ASME J. Heat Transfer 102(1980), 3, 471-476.

[3] Cavallini A., CensiG., Del Col D., Doretti L., Longo G.A., Rossetto L.: Condensation of halogenated refrigerants inside smooth tubes. HVAC and Research 8(2002), 429-451.

[4] Cavallini A., Censi G., Del Col D., Doretti L., Longo G.A., Rossetto L., Zilio C.: Condensation inside and outside smooth and enhanced tubes - a review of recent research. Int. J. Heat Mass Transfer 26(2002), 373-392.

[5] Cavallini A., Censi G., Del Col D., Doretti L., Longo G. A., Rossetto L.: Experimental investigation on condensation heat transfer and pressure drop of new HFC refrigerants (R134a, R125, R32, R410A, R236ea) in a horizontal smooth tube. Int. J. Heat Mass Transfer 24(2000), 73-87.

[6] Chiou C.B., Lu D.C., Liao C.Y., Su Y.Y.: Experimental study of forced convective boiling for non-azeotropic refrigerant mixtures R-22/R-124 in horizontal smooth tube. Appl. Thermal Eng. 29(2009), 1864-1871.

[7] Friedel L.: Improved friction pressure drop correlations for horizontal and vertical two-phase pipe flow. In: Proc. European Two-Phase Flow Group Meeting, Paper E2, Ispra, Italy, 1979.

[8] Garimella S.: Condensation flow mechanisms in microchannels: basis for pressure drop and heat transfer models. Heat Transfer Eng. 25(2004), 3, 104-116.

[9] Kosky P.G., Staub F.W.: Local condensing heat transfer coefficients in the annular flow regime. AIChE J. 17(1971), 5, 1037-1043.

[10] Mikielewicz D., Mikielewicz J., Tesmar J.: Improved semi-empirical method for determination of heat transfer coefficient in flow boiling in conventional and small diameter tubes. Int. J. Heat Mass Transfer 50(2007), 3949-3956.

[11] Mikielewicz D., Mikielewicz J.: A common method for calculation of flow boiling and flow condensation heat transfer coefficients in minichannels with account of non-adiabatic effects. accepted for publication in Heat Transfer Engng, 2010.

[12] Mikielewicz D., Mikielewicz J.: Non-isothermal effects in condensation inside tubes. In: Proc. XIV Conf. of Heat and Mass Transfer, Międzyzdroje 2010.

[13] Mikielewicz D.: A new method for determination of flow boiling heat transfer coefficient in conventional diameter channels and minichannels. Heat Transfer Eng. 31(2009), 4, 276-284.

[14] Müller-Steinhagen R., Heck K.: A simple friction pressure drop correlation for two-phase flow in pipes. Chem. Eng. Progress 20(1986).

[15] Ould Didi M.B., Kattan N., Thome J.R.: Prediction of two-phase pressure gradients of refrigerants in horizontal tubes. Int. J. Refrigeration 25(2002), 935-947.

[16] Sun L., Mishima K.: Evaluation analysis of prediction methods for two-phase flow pressure drop in mini-channels. Int. J. of Multiphase Flows 35(2009), 47-54.

[17] Traviss, D.P., Rohsenow W.M.: Flow regimes in horizontal two-phase flow with condensation. ASHRAE Trans. 79(1973), 2. 31-39.

[18] Thome J.R., El Hajal J., Cavallini A.: Condensation in horizontal tubes. Part 1: Two-phase flow pattern map. Int. J. Heat Mass Transfer 46(2003), 3349-3363.

[19] Thome J.R., El Hajal J., Cavallini A.: Condensation in horizontal tubes. Part 2: New heat transfer model based on flow. Int. J. Heat Mass Transfer 24(2003), 3365-3387.

[20] Thome J. R., Consolini L.: Mechanisms of boiling in micro-channels: critical assessment. In: Proc. 5th Int. Conf. on Transport Phenomena in Multiphase Systems, June 30-July 3, Bialystok 2008.

Archives of Thermodynamics

The Journal of Committee on Thermodynamics and Combustion of Polish Academy of Sciences

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CiteScore 2016: 0.54

SCImago Journal Rank (SJR) 2016: 0.319
Source Normalized Impact per Paper (SNIP) 2016: 0.598

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