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ISSN Druckformat: 1064-2285
ISSN Online: 2162-6561
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MARANGONI CONDENSATION OF STEAM–ETHANOL MIXTURES USING LOW-ETHANOL CONCENTRATIONS
ABSTRAKT
Marangoni condensation heat transfer characteristics of steam−ethanol mixture were experimentally investigated using a horizontal smooth tube at atmospheric pressure. Results were obtained over a range of ethanol concentration, vapor velocity, and vapor-to-surface temperature difference. Ethanol concentrations by mass in the boiler when cold prior to start up were 0.001, 0.005, 0.01, 0.017, and 0.021%. The results indicate that maximum heat transfer enhancement of around 4 times was obtained at ethanol concentrations of 0.017 and 0.21%. Moreover, the point of maximum heat transfer shift ed from lower to higher vapor-to-surface temperature difference with increasing ethanol concentration. The condensate appearance changed from filmwise to the dropwise mode with increasing vapor-to-surface temperature difference. Photographs showing the condensate appearance are also included in the paper.
-
Ali, H.M. and Briggs, A., An Investigation of Condensate Retention on Pin-Fin Tubes, Appl. Therm. Eng., vol. 63. no. 2, pp. 503-510, 2014.
-
Ali, H., Rafique, N., Hussain, A., and Farooq, H., Effect of Condensate Flow Rate and Vapor Velocity on Condensate Retention for Pin-Fins Tube, J. Enhanced Heat Transf., vol. 26, no. 6, pp. 619-630, 2019.
-
Ali, H., Sheng Wang, H., Briggs, A., and Rose, J., Effects of Vapor Velocity and Pressure on Marangoni Condensation of Steam-Ethanol Mixtures on a Horizontal Tube, J. Heat Transf., vol. 135, no. 3, pp. 1-14, 2013.
-
Briggs, A., Condensation Heat Transfer on Pin-Fin Tubes: Effect of Thermal Conductivity and Pin Height, Appl. Therm. Eng., vol. 60, pp. 1-7, 2012.
-
Fujii, T., Theory of Laminar Film Condensation, Berlin: Springer-Verlag, 1991.
-
Fujii, T., Koyama, S., and Nishida, S., Expressions of Physical Properties Concerning Condensation of Ethanol-Water-Air Mixture, Institute of Industrial Science, Kyushu University, Report No. 75, pp. 63-76 (in Japanese).
-
Gu, H., Wang, H., Chen, Q., and Yao, J., Vaccum Condensation in an Inclined Flate Tube: Heat Transfer and Pressure Drop, Heat Transf. Res., vol. 49, no. 1, pp. 15-29, 2018.
-
Guo, Z., Heat Transfer Enhancement-A Brief Review of 2018 Literature, J. Enhanced Heat Transf., vol. 26, no. 5, pp. 429-449, 2019.
-
Hijikata, K., Fukasaku, Y., and Nakabeppu, O., Theoretical and Experimental Studies on the Pseudo-Dropwise Condensation of a Binary Vapor Mixture, J. Heat Transf., vol. 118, no. 1, pp. 140-147. 1996.
-
Hu, H., Yang, G., Ding, G., Chen, J., Yang, W., and Hu, S., Heat Transfer Characteristics of Mixed Hydrocarbon Refrigerant Flow Condensation in Shell Side of Helically Baffl ed Shell-and-Tube Heat Exchanger, Appl. Therm. Eng., vol. 133, pp. 785-796, 2018.
-
Hu, S., Ma, X., and Zhou, W., Condensation Heat Transfer of Ethanol-Water Vapor in a Plate Heat Exchanger, Appl. Therm. Eng., vol. 113, pp. 1047-1055, 2017.
-
Hu, S., Yan, J, and Wang, S., Effect of Temperature Gradient on Marangoni Condensation Heat Transfer for Ethanol-Water Mixtures, Int. J. Multiphase Flow, vol. 33, No. 9, pp. 935-947, 2007.
-
Jiang, R., Lan, Z., Hao, T., Zheng, Y., Wang, K., Yang, Y., and Ma, X., Two-Phase Flow Patterns for Condensation of Ethanol-Water Mixtures in Triangular Microchannels, Appl. Therm. Eng., vol. 121, pp. 361-367, 2017.
-
Kim, D.E., Ahn, H.S., and Kwon, T.S., Experimental Investigation of Filmwise and Dropwise Condensation inside Transparent Circular Tubes, Appl. Therm. Eng., vol. 110, pp. 412-423, 2017.
-
Kim, N., Steam Condensation and Tube-Side Heat Transfer of Titanium Corrugated Tubes, J. Heat Transf. Eng., vol. 41, pp. 324-332, 2020.
-
Kukulka, D.J., Smith, R., Li, W., and Niu, Z., Comparison of the Evaporation and Condensation Heat Transfer Coeffi cients on the Outside of Smooth, Micro Fin and Vipertex® 1EHT Enhanced Heat Transfer Tubes, in Proc. 11th Int. Conf. on Heat Transfer, Fluid Mechanics, and Thermodynamics, vol. 105, pp. 803-812, 2011.
-
Lee, C., Abbasi, M.S., Park, S., Lim, H., and Lee, J., Effect of the Surface Wettability Changes on Nanostructured Polymer Film for Heat Exchanger Applications, Appl. Phys. Lett., vol. 113, no. 1, 2018. DOI: 10.1063/1.5026061.
-
Lee, W. and Rose, J.W., Forced Convection Film Condensation on a Horizontal Tube with and without Non-Condensing Gases, Int. J. Heat Mass Transf., vol. 27, pp. 519-528, 1984.
-
Mirkovich, V.V. and Missen, R.W., Study of Condensation of Binary Vapors of Miscible Liquids, Can. J. Chem. Eng., vol. 41, pp. 73-78, 1963.
-
Murase, T., Wang, H.S., and Rose, J.W., Marangoni Condensation of Steam-Ethanol Mixtures on a Horizontal Tube, Int. J. Heat Mass Transf., vol. 50, pp. 3774-3779, 2007.
-
Nusselt, W., Die Oberfl achenkodensation des Wasserdampfes, Z. Ver. Dtsch. Ing., vol. 60, pp. 569-575, 1916.
-
Rose, J.W., Surface Tension Effects and Enhancement of Condensation Heat Transfer, Chem. Eng. Res. Des., vol. 82, no. 4, pp. 419-429, 2004.
-
Shekriladze, I.G. and Gomelauri, V.I., Theoretical Study of Laminar Film Condensation of a Flowing Vapor, Int. J. Heat Mass Transf., vol. 9, pp. 581-591, 1966.
-
Utaka, Y. and Terachi, N., Measurements of Condensation Characteristic Curves for Binary Mixture of Steam and Ethanol Vapor, Heat Transf. - Jpn. Res., vol. 24, pp. 57-67, 1955.
-
Utaka, Y. and Wang, S., Characteristic Curves and the Promotion Effect of Ethanol Addition on Steam Condensation Heat Transfer, Int. J. Heat Mass Transf., vol. 47, no. 21, pp. 4507-4516, 2004.
-
Utaka, Y. and Wang, S., Promotion of Steam Condensation Heat Transfer Using Solutal Marangoni Condensation, Transact. JSME, vol. 68, pp. 148-156, 2002.
-
Wang, J.S., Yan, J.J., Hu, S.H., and Liu, J.P., Marangoni Condensation Heat Transfer of Water-Ethanol Mixtures on a Vertical Surface with Temperature Gradients, Int. J. Heat Mass Transf., vol. 52, nos. 9-10, pp. 2324-2334, 2009.
-
Yan, J., Yang, Y., Hu, S., Kejian, Z., and Liu, J., Effect of Vapor Pressure/Velocity and Concentration on Condensation Heat Transfer for Steam-Ethanol Vapor Mixture, Int. J. Heat Mass Transf., vol. 44, pp. 51-60, 2007.
-
Zhang, T. and O'Neal, L., Phase Transition of Water Droplets with Different Static Contact Angles, Heat Transf. Res., vol. 50, no. 4, pp. 381-397, 2019.
-
Zheng, Z., Zhou, L., Du, X., Yang, Y., Jiang, P., and Wang, B., Numerical Investigation on Marangoni Convection of Binary Fluids in a Closed Microcavity, Appl. Therm. Eng., vol. 88, pp. 464-472, 2014.