Flow characteristics of single-phase flow in narrow annular channels
Tóm tắt
The characteristics of single-phase flow in narrow annular channels were analyzed and theoretical model was proposed. Based on the present model, the theoretical calculation was performed to predict the flow characteristics for the developed flow in narrow annuli with the gap sizes of 1.0, 1.5 and 2.0 mm, respectively. The results were in good agreement with the experimental data. In addition, the gap size of narrow annuli has great impact upon the flow characteristics. The decrease of gap size reduces friction factor. The higher the Reynolds number, the more remarkable the effect of gap size upon friction coefficient during single-phase flowing through narrow annular channels. The effect of gap size upon friction coefficient is dependent on the Reynolds number, and will decrease with the decrease of the Reynolds number.
Tài liệu tham khảo
Li B, He A D, Wand Y S, et al. An experimental investigation on the flow and heat transfer of the narrow-gap tube vapor generators: Friction resistance. Chemical Engineering & Machinery, 2001, 28(2): 67–70 (in Chinese)
Sun Z N, Sun L C, Yan C Q, et al. Experimental investigation of single-phase flow friction in narrow annuli. Nuclear Power Engineering, 2004, 25(2): 123–127 (in Chinese)
Sun L C, Yan C Q, Sun Z N. Experimental study on forced water flow resistance in narrow annulus. Nuclear Power Engineering, 2003, 24(4): 359–362 (in Chinese)
Peng C H. Experimental study of two-phase flow and boiling heat transfer of water in the vertical narrow annuli. Dissertation for the Doctoral Degree. Xi’an: Xi’an Jiaotong University, 2005 (in Chinese)
Wu G. Experimental study on heat transfer and flow characteristics of single-phase water and superheated vapor in narrow annular channel. Dissertation for the Master’s Degree. Xi’an: Xi’an Jiaotong University, China, 2005 (in Chinese)
Warrier G R, Dhir V K, Momoda L A. Heat transfer and pressure drop in narrow rectangular channels. Experimental Thermal and Fluid Science, 2002 26(1): 53–64
Peng X F, Peterson G P. Convective heat transfer and flow friction for water flow in microchannel structures. International Journal of Heat and Mass Transfer, 1996, 39(12): 2599–2608
Xin M D, Shi J S. Experiments on forced convective heat transfer performance in rectangular microchannels. Journal of Chongqing University, 1994, 17(3): 117–122 (in Chinese)
Rehme K. Turbulent flow in smooth concentric annuli with small radius ratios. J Fluid Mech, 1974, 64: 263–287
Kays W M, Leung K T. Heat transfer in annular passages-hydrodynamically developed turbulent flow with arbitrarily prescribed heat flux. International Journal of Heat and Mass Transfer, 1963, 6(7): 537–557
Churchill S W, Chan C. Theoretically based correlating equations for the local characteristics of fully turbulent flow in round tubes and between parallel plates. Industrial & Engineering Chemistry Research, 1995, 34(4): 1332–1341
Kaneda M, Yu B, Ozoe H, et al. The characteristics of turbulent flow and convection in concentric circular annuli: flow. International Journal of Heat and Mass Transfer, 2003, 46(26): 5045–5057