| Citation: | LI Jie, ZHANG Dalin, ZHAN Hongbo, et al. Experimental study on flow condensation heat transfer of R134a in serrated mini channel[J]. Journal of Aerospace Power, 2026, 41（2）：20230669 doi: 10.13224/j.cnki.jasp.20230669
|
The flow condensation heat transfer characteristics of refrigerant R134a in three types of serrated mini channels were studied using air jet impingement cooling method on the channel wall. The equivalent diameters of the channels were 1.13, 1.18 mm, and 1.44 mm, respectively. The experimental conditions included: vapor quality from 0 to 1, mass flux from 56 to 430 kg/(m2·s), heat flux in ranges of 8.4—44.2 kW/m2, and the saturation temperature of refrigerant between 50 ℃ and 70 ℃. The local condensation heat transfer coefficient of the channel was obtained, and the effects of serrated fin geometry, vapor quality, saturation pressure, mass flux and heat flux on the condensation heat transfer were analyzed. The results indicated that the increase in vapor quality and mass flux led to an increase in fluid turbulence, a decrease in condensate film thickness, and enhanced condensation heat transfer. The increase in saturation temperature was accompanied by a decrease in the liquid phase thermal conductivity, liquid vapor density ratio, and viscosity ratio of the refrigerant. This increased the thermal resistance of the liquid film while reducing the shear force at the gas-liquid interface, thereby weakening the condensation heat transfer. The higher heat flux indicated the greater heat transfer coefficient. However, as the vapor quality decreased and the liquid film thickness increased, the effect of heat flux gradually decreased and tended to disappear. For serrated mini channels with the same fin height, reducing the fin spacing can increase the condensation heat transfer coefficient. For serrated channels with the same fin spacing, the effect of fin height variation on condensation heat transfer coefficient was not significant. Based on experimental data, a correlation was proposed to calculate the condensation heat transfer coefficient of different serrated mini channels.
| [1] |
VAN A S J, JUDT D M, HAFARI S, et al. Aircraft ther-mal management: practices, technology, system architec-tures, future challenges, and opportunities[J]. Progress in Aerospace Sciences, 2022, 128: 100767. doi: 10.1016/j.paerosci.2021.100767
|
| [2] |
EL KADI K, ALNAIMAT F, SHERIF S A. Recent advances in condensation heat transfer in mini and micro channels: a comprehensive review[J]. Applied Thermal Engineering, 2021, 197: 117412. doi: 10.1016/j.applthermaleng.2021.117412
|
| [3] |
张宗卫, 郑东生, 张盛辉, 等. R141b在矩形微尺度通道中的两相流传热特性[J]. 航空动力学报, 2018, 33(8): 1793-1800. ZHANG Zongwei, ZHENG Dongsheng, ZHANG Shenghui, et al. Two-phase heat transfer characteristics of R141b in rectangular micro-channels[J]. Journal of Aerospace Power, 2018, 33(8): 1793-1800. (in Chinese
ZHANG Zongwei, ZHENG Dongsheng, ZHANG Shenghui, et al. Two-phase heat transfer characteristics of R141b in rectangular micro-channels[J]. Journal of Aerospace Power, 2018, 33(8): 1793-1800. (in Chinese)
|
| [4] |
MORROW J A, DERBY M M. Flow condensation heat transfer and pressure drop of R134a alternative refrigerants R513A and R450A in 0.95 mm diameter minichannels[J]. International Journal of Heat and Mass Transfer, 2022, 192: 122894. doi: 10.1016/j.ijheatmasstransfer.2022.122894
|
| [5] |
COL D, BORTOLATO M, AZZOLIN M, et al. Condensation heat transfer and two-phase frictional pressure drop in a single minichannel with R1234ze (E) and other refrigerants[J]. International Journal of Refrigeration, 2015, 50: 87-103. doi: 10.1016/j.ijrefrig.2014.10.022
|
| [6] |
ILLÁN-GÓMEZ F, LÓPEZ-BELCHÍ A, GARCÍA-CASCALES J R, et al. Experimental two-phase heat transfer coefficient and frictional pressure drop inside mini-channels during condensation with R1234yf and R134a[J]. International Journal of Refrigeration, 2015, 51: 12-23. doi: 10.1016/j.ijrefrig.2014.11.014
|
| [7] |
JIGE D, INOUE N, KOYAMA S. Condensation of refrigerants in a multiport tube with rectangular minichannels[J]. International Journal of Refrigeration, 2016, 67: 202-213. doi: 10.1016/j.ijrefrig.2016.03.020
|
| [8] |
BOHDAL T, CHARUN H, SIKORA M. Comparative investigations of the condensation of R134a and R404A refrigerants in pipe minichannels[J]. International Journal of Heat and Mass Transfer, 2011, 54(9/10): 1963-1974.
|
| [9] |
RAHMAN M M, KARIYA K, MIYARA A. An experimental study and development of new correlation for condensation heat transfer coefficient of refrigerant inside a multiport minichannel with and without fins[J]. International Journal of Heat and Mass Transfer, 2018, 116: 50-60. doi: 10.1016/j.ijheatmasstransfer.2017.09.010
|
| [10] |
詹宏波, 郑文远, 文涛, 等. 微尺度通道内R134a的冷凝传热实验研究[J]. 化工学报, 2020, 71(增刊1): 83-89. ZHAN Hongbo, ZHENG Wenyuan, WEN Tao, et al. Experimental investigation on condensation heat transfer of refrigerant R134a in micro-scale channel[J]. CIESC Journal, 2020, 71(Suppl.1): 83-89. (in Chinese
ZHAN Hongbo, ZHENG Wenyuan, WEN Tao, et al. Experimental investigation on condensation heat transfer of refrigerant R134a in micro-scale channel[J]. CIESC Journal, 2020, 71(Suppl.1): 83-89. (in Chinese)
|
| [11] |
ZHANG Huiyong, LI Junming, LIU Na, et al. Experimental investigation of condensation heat transfer and pressure drop of R22, R410A and R407C in mini-tubes[J]. International Journal of Heat and Mass Transfer, 2012, 55(13/14): 3522-3532.
|
| [12] |
SAKAMATAPAN K, KAEW-ON J, DALKILIC A S, et al. Condensation heat transfer characteristics of R-134a flowing inside the multiport minichannels[J]. International Journal of Heat and Mass Transfer, 2013, 64: 976-985. doi: 10.1016/j.ijheatmasstransfer.2013.04.020
|
| [13] |
GOSS G, PASSOS J C. Heat transfer during the condensation of R134a inside eight parallel microchannels[J]. International Journal of Heat and Mass Transfer, 2013, 59: 9-19. doi: 10.1016/j.ijheatmasstransfer.2012.10.014
|
| [14] |
DERBY M, LEE H J, PELES Y, et al. Condensation heat transfer in square, triangular, and semi-circular mini-channels[J]. International Journal of Heat and Mass Transfer, 2012, 55(1/2/3): 187-197.
|
| [15] |
TONINELLI P, BORTOLIN S, AZZOLIN M, et al. Effects of geometry and fluid properties during condensation in minichannels: experiments and simulations[J]. Heat and Mass Transfer, 2019, 55(1): 41-57. doi: 10.1007/s00231-017-2180-7
|
| [16] |
KIM S M, MUDAWAR I. Flow condensation in parallel micro-channels: Part 2 heat transfer results and correlation technique[J]. International Journal of Heat and Mass Transfer, 2012, 55(4): 984-994. doi: 10.1016/j.ijheatmasstransfer.2011.10.012
|
| [17] |
DAISUKE J, NAOKI M, MAIKA N, et al. Condensation heat transfer of pure refrigerants R1234yf and R32 inside multiple circular minichannels[J]. International Journal of Heat and Mass Transfer, 2022, 195: 123146. doi: 10.1016/j.ijheatmasstransfer.2022.123146
|
| [18] |
KRUZEL M, BOHDAL T, SIKORA M. Heat transfer and pressure drop during refrigerants condensation in compact heat exchangers[J]. International Journal of Heat and Mass Transfer, 2020, 161: 120283. doi: 10.1016/j.ijheatmasstransfer.2020.120283
|
| [19] |
BOHDAL T, KRUZEL M. Refrigerant condensation in vertical pipe minichannels under various heat flux density level[J]. International Journal of Heat and Mass Transfer, 2020, 146: 118849. doi: 10.1016/j.ijheatmasstransfer.2019.118849
|
| [20] |
KNIPPER P, BERTSCHE D, GNEITING R, et al. Experimental investigation of heat transfer and pressure drop during condensation of R134a in multiport flat tubes[J]. International Journal of Refrigeration, 2019, 98: 211-221. doi: 10.1016/j.ijrefrig.2018.10.019
|
| [21] |
ZHANG Leigang, XU Bo, SHI Juan, et al. Experimental study on condensation heat transfer of FC-72 in a narrow rectangular channel with ellipse-shape pin fins: Ground and microgravity experiments[J]. International Journal of Heat and Mass Transfer, 2019, 141: 1272-1287. doi: 10.1016/j.ijheatmasstransfer.2019.06.055
|
| [22] |
刘冉, 李杰, 王玉兵, 等. 微小菱形离散肋通道中R134a的冷凝换热实验研究[J]. 化工学报, 2022, 73(11): 4938-4947. LIU Ran, LI Jie, WANG Yubing, et al. Experimental study on condensation heat transfer of R134a in mini channel with micro diamond fins[J]. CIESC Journal, 2022, 73(11): 4938-4947. (in Chinese
LIU Ran, LI Jie, WANG Yubing, et al. Experimental study on condensation heat transfer of R134a in mini channel with micro diamond fins[J]. CIESC Journal, 2022, 73(11): 4938-4947. (in Chinese)
|
| [23] |
YANG Yujie, LI Yanzhong. General prediction of the thermal hydraulic performance for plate-fin heat exchanger with offset strip fins[J]. International Journal of Heat and Mass Transfer, 2014, 78: 860-870. doi: 10.1016/j.ijheatmasstransfer.2014.07.060
|
| [24] |
WEN Tao, ZHAN Hongbo, ZHANG Dalin. Flow condensation in a mini channel with serrated fins with jet impingement cooling: Experimental study and development of new correlation[J]. International Journal of Heat and Mass Transfer, 2018, 127: 1025-1040.
|
| [25] |
RAMANA MURTHY K V, RANGANAYAKULU C, ASHOK BABU T P. Condensation heat transfer and pressure drop of R-134a saturated vapour inside a brazed compact plate fin heat exchanger with serrated fin[J]. Heat and Mass Transfer, 2017, 53(1): 331-341. doi: 10.1007/s00231-016-1827-0
|
| [26] |
DERBY M M, LEE H J, CRAFT R C, et al. Exploration of experimental techniques to determine the condensation heat flux in microchannels and minichannels[C]//Proceedings of the 14th International Heat Transfer Conference, Washington, US: ASME 2010: 169-176.
|
| [27] |
HAN Y, KANNO H, AHN Y J, et al. Measurement of liquid film thickness in micro tube annular flow[J]. International Journal of Multiphase Flow, 2015, 73: 264-274. doi: 10.1016/j.ijmultiphaseflow.2015.03.016
|
| [28] |
BERTO A, LAVIEILLE P, AZZOLIN M, et al. Film thickness, interfacial waviness and heat transfer during downflow condensation of R134a[J]. Applied Thermal Engineering, 2022, 214: 118808. doi: 10.1016/j.applthermaleng.2022.118808
|
| [29] |
JU Peng, HIBIKI T. Flow characteristics of gas-liquid adiabatic and boiling annular two-phase flows[J]. International Journal of Heat and Mass Transfer, 2023, 210: 124161. doi: 10.1016/j.ijheatmasstransfer.2023.124161
|
| [30] |
LIU Na, LI Junming. Experimental study on condensation heat transfer of R32, R152a and R22 in horizontal minichannels[J]. Applied Thermal Engineering, 2015, 90: 763-773. doi: 10.1016/j.applthermaleng.2015.07.062
|
| [31] |
SHAH M M. Improved correlation for heat transfer during condensation in mini and macro channels[J]. International Journal of Heat and Mass Transfer, 2022, 194: 123069. doi: 10.1016/j.ijheatmasstransfer.2022.123069
|
DownLoad:
