Experimental study on the inhibition of heat transfer deterioration of supercritical pressure CO2
WANG Zhenchuan, XU Ruina, XIONG Chao, JIANG Peixue
Beijing Key Laboratory for CO2 Utilization and Reduction Technology, Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
Abstract：The heat transfer can deteriorate with supercritical pressure fluids flowing in vertical tubes due to buoyancy. This study used a helical insert in the tube to change the flow structure and improve fluid heat transfer. Convection heat transfer of supercritical pressure CO2 in a vertical bare tube and with a helical insert was investigated experimentally to identify the effects of the heat flux, inlet Re, and flow direction on the heat transfer for both cases. The wall temperature distribution is nonlinear due to the buoyancy effect with the peak wall temperature gradually moving towards the entrance as the heat flux increases. The helical structure inserted into the bare tube effectively suppresses the heat transfer deterioration caused by the buoyancy effect and significantly increases the convective heat transfer the supercritical pressure CO2 in vertical tubes. The buoyancy effect can still reduce the heat transfer with supercritical pressure CO2 upward flow even with the helical insert structure for high heat fluxes.
王振川, 胥蕊娜, 熊超, 姜培学. 超临界压力CO2竖直管内传热恶化抑制实验[J]. 清华大学学报（自然科学版）, 2018, 58(12): 1101-1106.
WANG Zhenchuan, XU Ruina, XIONG Chao, JIANG Peixue. Experimental study on the inhibition of heat transfer deterioration of supercritical pressure CO2. Journal of Tsinghua University(Science and Technology), 2018, 58(12): 1101-1106.
[1] HEJZLAR P, DOSTAL V, DRISCOLL M J, et al. Assessment of gas cooled fast reactor with indirect supercritical CO2 cycle[J]. Nuclear Engineering and Technology, 2006, 38(2):109-118. [2] 黄彦平, 王俊峰. 超临界二氧化碳在核反应堆系统中的应用[J]. 核动力工程, 2012, 33(3):21-27. HUANG Y P, WANG J F. Applications of supercritical carbon dioxide in nuclear reactor system[J]. Nuclear Power Engineering, 2012, 33(3):22-27. (in Chinese) [3] 赵新宝, 鲁金涛, 袁勇, 等. 超临界二氧化碳布雷顿循环在发电机组中的应用和关键热端部件选材分析[J]. 中国电机工程学报, 2016, 36(1):154-162. ZHAO X B, LU J T, YUAN Y, et al. Analysis of supercritical carbon dioxide Brayton cycle and candidate materials of key hot components for power plants[J]. Proceedings of the CSEE, 2016, 36(1):154-162. (in Chinese) [4] NEISES T, TURCHI C. A comparison of supercritical carbon dioxide power cycle configurations with an emphasis on CSP applications[J]. Energy Procedia, 2014, 49:1187-1196. [5] HALL W B, JACKSON J D. Laminarisation of a turbulent pipe flow by buoyancy forces[C]//11th National Heat Transfer Conference. ASME Paper, 1969, No. 69-HT-55. [6] MCELIGOT D M, JACKSON J D. "Deterioration" criteria for convective heat transfer in gas flow through non-circular ducts[J]. Nuclear Engineering and Design, 2004, 232(3):327-333. [7] JIANG P X, ZHANG Y, ZHAO C R, et al. Convection heat transfer of CO2 at supercritical pressures in a vertical mini tube at relatively low reynolds numbers[J]. Experimental Thermal and Fluid Science, 2008, 32(8):1628-1637. [8] JIANG P X, ZHANG Y, SHI R F. Experimental and numerical investigation of convection heat transfer of CO2 at supercritical pressures in a vertical mini-tube[J]. International Journal of Heat and Mass Transfer, 2008, 51(11-12):3052-3056. [9] JIANG P X, LIU B, ZHAO C R, et al. Convection heat transfer of supercritical pressure carbon dioxide in a vertical micro tube from transition to turbulent flow regime[J]. International Journal of Heat and Mass Transfer, 2013, 56(1-2):741-749. [10] 王飞, 杨珏, 顾汉洋, 等. 垂直管内超临界水传热实验研究[J]. 原子能科学技术, 2013, 47(6):933-939. WANG F, YANG Y, GU H Y, et al. Experimental research on heat transfer performance of supercritical water in vertical tube[J]. Atomic Energy Science and Technology, 2013, 47(6):933-939. (in Chinese) [11] ANKUDINOV V B, KURGANOV V A. Intensification of deteriorated heat transfer in heated tubes at supercritical pressures[J]. High Temperature, 1981, 19(6):870-874. [12] BAE Y Y, KIM H Y, YOO T H. Effect of a helical wire on mixed convection heat transfer to carbon dioxide in a vertical circular tube at supercritical pressures[J]. International Journal of Heat and Fluid Flow, 2011, 32(1):340-351. [13] WANG J G, LI H X, GUO B, et al. Investigation of forced convection heat transfer of supercritical pressure water in a vertically upward internally ribbed tube[J]. Nuclear Engineering and Design, 2009, 239(10):1956-1964. [14] LI H Z, WANG H J, LUO Y S, et al. Experimental investigation on heat transfer from a heated rod with a helically wrapped wire inside a square vertical channel to water at supercritical pressures[J]. Nuclear Engineering and Design, 2009, 239(10):2004-2012. [15] LI Z H, WU Y X, TANG G L, et al. Numerical analysis of buoyancy effect and heat transfer enhancement in flow of supercritical water through internally ribbed tubes[J]. Applied Thermal Engineering, 2016, 98:1080-1090.
2018, Vol. 58 
