Abstract: The paper presents experimental studies on boiling heat transfer in rectangular minichannels. The investigations focus on the transition from single phase forced convection to nucleate boiling, i.e., in the zone of boiling incipience. The experiment has been carried out with FC-72, R-123 and R-11 at the Reynolds number below 4700, corresponding to mass flow rate range 95-710 kg/(m s). The main part of the test section is a minichannel of pre-set depth from 0.7 to 2 mm and width (20, 40 and 60 mm), with different spatial orientations from vertical to horizontal and 30% inclination angle adjustment. The objective of the paper includes the impact of selected parameters (liquid flow velocity, pressure and inlet liquid subcooling, channel dimensions and spatial orientation) on the boiling incipience in minichannels. The investigations are intended to develop a correlation for the calculations of the Nusselt number under the conditions of boiling incipience in the minichannel as a function of changeable parameters.
B I B L I O G R A F I A[1] Kandlikar S.G., Grande W.J.: Evolution of microchannel flow passages-thermohydraulic performance and fabrication technology. Heat Transfer Eng. 25(2002), 1, 3-17.
[2] Piasecka M., Maciejewska B.: The study of boiling heat transfer in vertically and horizontally oriented rectangular minichannels and the solution to the inverse heat transfer problem with the use of the Beck method and Trefftz functions. Exp. Therm. Fluid Sci. 38(2012), 19-32.
[3] Hozejowska S., Piasecka M., Poniewski M.E.: Boiling heat transfer in vertical minichannels. Liquid crystal experiments and numerical investigations. Int. J. Therm. Sci. 48(2009), 1049-1059.
[4] Piasecka M., Hozejowska S., Poniewski M.E.: Experimental evaluation of flow boiling incipience of subcooled fluid in a narrow channel. Int. J. Heat Fluid Flow 25(2004), 159-172.
[5] Corty C.: PhD thesis, Univ. Michigan, Ann Arbor 1951.
[6] van Camp W. M.: PhD thesis, Prude Univ., La Fayette 1952.
[7] Bräuer H., Mayinger F.: Onset of nucleate boiling and hysteresis effects under forced convection and pool boiling. Pool and External Flow Boiling ASME-HTD, (V.J. Dhir, A.E. Bergles Eds.), 1992, 15-36.
[8] Bar-Cohen A.: Hysteresis phenomena at the onset of nucleate boiling. Pool and External Flow Boiling ASME-HTD, (V.J. Dhir, Bergles A.E. Eds.), 1992, 1-14.
[9] Bilicki Z.: Latent heat transport in forced boiling flow. Int. J. Heat Mass Transfer 26(1983), 559-565.
[10] Bilicki Z.: The relation between the experiment and theory for nucleate forced boiling. In: Proc. 4th World Conf. on Exp. Heat Transfer Fluid Mech. Thermodyn. 2(1997), 571-578.
[11] Bohdal T., Czapp M.: Investigation of zero flow boiling crisis. In: Proc. Nat. Symp. on Heat and Mass Transfer, Warsaw-Jablonna (1986), 34-40 (in Polish).
[12] Bohdal T.: Development of bubbly boiling in channel flow. Exp. Heat Transfer 14(2001), 199-215.
[13] Celata G.P., Cumo M., Setaro T.: Hysteresis phenomena in subcooled flow boiling of well-wetting fluids. Exp. Heat Transfer 5(1992), 253-275.
[14] Peng X.F., Wang B.X.: Forced convection and flow boiling heat transfer for liquid flowing through microchannels., Int. J. Heat Mass Transfer 36(1993), 3421-3427.
[15] Peng X.F., Peterson G.P.: The effect of thermofluid and geometrical parameters on convection of liquids through rectangular microchannels. Int. J. Heat Mass Transfer 38(1995), 755-758.
[16] Peng X.F., Peterson G.P.: Convective heat transfer and flow friction for water flow in microchannel structures. Int. J. Heat Mass Transfer 39(1996), 2599-2608.
[17] Peng X.F., Hu H.Y., Wang B.X.: Boiling nucleation during liquid flow in microchannels. Int. J. Heat Mass Transfer 41(1998), 101-106.
[18] Orozco J., Hanson C.: A study of mixed convection boiling heat transfer in narrow gaps. ASME-HTD 206-2(1992), 81-85.
[19] Chin Y., Hollingsworth D.K., Witte L.C.: A study of convection in an asymmetrically heated duct using liquid crystal thermography. ASME-HTD 357-2(1998), 63-70.
[20] Chin Y., Witte L.C., Hollingsworth D.K.: Investigation of flow boiling incipience in a narrow rectangular channel using liquid crystal thermography. ASME-HTD 357-3(1998), 79-86.
[21] Hollingsworth D.K.: Liquid crystal imaging of flow boiling in minichannels. In: Proc. 2nd Int. Conf. on Microchannels and Minichannels, Rochester, USA, (2004), ASME, 57-66.
[22] Ammerman C., You S.: Enhanced convective boiling of FC-87 in small, rectangular, horizontal channels: heat transfer coefficient and CHF. ASME HTD 357(1998), 225-233.
[23] Wambsganss M.W., France D.M., Jendrzejczyk J.A., Tran T.A.: Boiling heat transfer in a horizontal small-diameter tube. J. Heat Transfer 115(1993), 963-972.
[24] Wambsganss M.W., Jendrzejczyk J.A., France D.M.: Two-phase flow patterns and transitions in a small, horizontal, rectangular channel. Int. J. Multiphase Flow 17(1991), 327-342.
[25] Wambsganss M.W., France D.M.: Small circular and rectangular channels boiling with two refrigerants. Int. J. Multiphase Flow 20(1996), 485-498.
[26] Cortina Diaz M., Boye H., Hapke I., Schmidt J., Staate Y., Zhekov Z.: Investigation of flow boiling in narrow channels by thermographic measurement of local wall temperatures. Microfluid Nanofluid 2(2005), 1-11.
[27] Brutin D., Tadrist L.: Pressure drop and heat transfer analysis of flow boiling in a minichannel: influence of the inlet condition on two-phase flow stability. Int. J. Heat Mass Transfer 47(2004), 2365-2377.
[28] Reynaud S., Debray F., Franc J. P., Maitre T.: Hydrodynamics and heat transfer in two-dimensional minichannels. Int. J. Heat Mass Transfer 48(2005), 3197-3211.
[29] Shuai J., Kulenovic R., Groll M.: Heat transfer and pressure drop for flow boiling of water in narrow vertical rectangular channels. In: Proc. 1st Int. Conf. on Microchannels and Minichannels, Rochester, USA, (2003), 667-673.
[30] Sobierska E., Kulenovic R., Mertz R., Groll M.: Experimental results of flow boiling of water in a vertical microchannel. Exp. Therm. Fluid Sc. 31(2006), 111-119.
[31] Agostini B., Bontemps A.: Vertical flow boiling of refrigerant R-134a in small channels. Int. J. Heat Fluid Flow 26(2005), 296-306.
[32] Kandlikar S.G.: Fundamental issues related to flow boiling in minichannels and microchannels. Exp. Therm. Fluid Sci. 26(2002), 389-407.
[33] Kandlikar S.G.: Scale effects on flow boiling heat transfer in microchannels: A fundamental perspective. Int. J. Therm. Sci. 49(2010), 1073-1085.
[34] Brutin D., Tadrist L.: Pressure drop and heat transfer analysis of flow boiling in a minichannel: influence of the inlet condition on two-phase flow stability. Int. J. Heat Mass Transfer 47(2004), 2365-2377.
[35] Tadrist L.: Review of two-phase flow instabilities in narrow spaces. In: Proc. ECI Int. Conf. Heat Transfer and Fluid Flow in Microscale, Castelvecchio Pascoli, Italy, (2005), CD-No. 25.
[36] Thome J.R.: Boiling in microchannels: a review of experiment and theory. Int. J. Heat and Fluid Flow 25(2004), 128-139.
[37] Mikielewicz D., Klugmann M., Wajs J.: Experimental investigation of Mshape heat transfer coefficient distribution of R123 flow boiling in small-diameter tubes. Heat Transfer Eng. 33 (2012), 584-595.
[38] Mikielewicz D., Mikielewicz J.: A common method for calculation of flow boiling and flow condensation heat transfer coefficients in minichannels with account of nonadiabatic effects. Heat Transfer Eng. 32(2011), 1173-1181.
[39] Mikielewicz D.: A new method for determination of flow boiling heat transfer coefficient in conventional-diameter channels and minichannels. Heat Transfer Eng. 31(2010), 276-287.
[40] 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.
[41] Dutkowski K.: Experimental investigations of Poiseuille number laminar flow of water and air in minichannels. Int. J. Heat Mass Transfer 51(2008), 5983-5990.
[42] Dutkowski K.: Influence of the flashing phenomenon on the boiling curve of refrigerant R-134a in minichannels. Int. J. Heat Mass Transfer 53(2010), 1036-1043.
[43] Dutkowski K.: Air-water two-phase frictional pressure drop in minichannels. Heat Transfer Eng. 31(2010), 321-330.
[44] Dutkowski K.: Two-phase pressure drop of air-water in minichannels. Int. J. Heat Mass Transfer 52(2009), 5185-5192.
[45] Piasecka M., Maciejewska B.: Application of the finite element method to the determining of boiling heat transfer coefficient for minichannel flow. Arch. Thermodyn. 34(2013).
[46] Piasecka M., Poniewski M. E.: Liquid crystal thermography applied to investigations into heat transfer in minichanels. Metrol Meas. Sys. 11(2004), 259-274.
[47] Piasecka M., Poniewski M. E.: Hysteresis phenomena at the onset of subcooled nucleate flow boiling in microchannels. Heat Transfer Eng. J. 25(2004), 44-51.
[48] Thome J.R.: Enhanced Boiling Heat Transfer. Hemisphere, New York-Washington-Philadelphia-London 1990.
[49] Bohdal T.: Development of bubbly boiling in channel flow. Exp. Heat Transfer 14(2001), 3, 199-215. 
Pełny tekst 
DOI 
YADDA/CEON