The new form of vertical single tube steam-syrup falling film evaporation experimental platform was built to study the heat transfer performance of inserting the specific structure and technological parameters’ spiral in tube for the viscous syrup falling film evaporation, and conducting the 4 h comparative syrup falling film evaporation experiment for added and no added spiral. The results showed that inserting spiral has obviously effect on improving the heat transfer performance of syrup falling film evaporation, under the same experimental conditions, the total heat transfer coefficient improved 25.9%~82.9% than that inserted nothing, and the decline rate of total heat transfer coefficient with time was lower apparently. When the heat transfer temperature difference increased, the heat transfer of the evaporation side for inner tube get better but the condensation side for outer tube get deterioration, material physical properties changes (viscosity reduction) can enhanced heat transfer effect by increasing the heat transfer temperature difference. In the non-fouling affected heat transfer period, further processed was made for the evaporation side heat transfer coefficient, which obtaining the correlation between the inner tube comprehensive heat transfer coefficient and heat transfer temperature difference.
Deqi PENG Lanwei CHEN Haisong LUO Tianlan YU Kang CHEN Hao LI Yuye HAN
. Heat Transfer Enhancement of Syrup Vertical Falling-film Evaporation by Spiral Inserts[J]. The Chinese Journal of Process Engineering, 2017
, 17(6)
: 1134
-1139
.
DOI: 10.12034/j.issn.1009-606X.217133
[1]Tobe P, Wiedemann K G.Falling film evaporators for the sugar industry[J].ZuckerInd, 1992, 1(17):73-76
[2]Journet G.Falling film evaporators in cane sugar mills[J].International sugar journal, 2005, 107(1280):468-474
[3] Saravacos G, Kostaropoulos A E.Food Evaporation Equipment[M]//Handbook of Food Processing Equipment. Springer International Publishing, 2016: 331-365.
[4]Fujita T, Ueda T.Heat transfer to falling liquid films and film breakdown-I: Subcooled liquid films[J].International Journal of Heat and Mass Transfer, 1978, 21(2):97-108
[5]Toshihiko F, Tatsuhiro U.Heat transfer to falling liquid films and film breakdown—II: Saturated liquid films with nucleate boiling[J].International Journal of Heat and Mass Transfer, 1978, 21(2):109-118
[6] B.[J]., 2007, :2111-2111
[7] 范永坚, 徐宏, 徐鹏.竖直多孔管降膜蒸发传热实验[J]. 化工学报, 2016, 02:512-518.
[8]FAN Yongjian（范永坚）, XU Hong（徐宏）, XU Peng（徐鹏）.Heat transfer experiment of falling-film evaporation in vertical porous tube[J]. CIESC Journal, 2016, 02:512-518.
[9] Karlsson E, Gourdon M, Olausson L, et al.Heat transfer for falling film evaporation of black liquor up to very high Prandtl numbers[J]. International Journal of Heat and Mass Transfer, 2013, 65: 907-918.
[10]王永福, 周荣琪, 段占庭.脂肪酸降膜蒸发传热研究[J]. 化学工程, 2001, 06:20-23+2.
[11]Wang Yongfu（王永福）, Zhou Rongqi（周荣琪）, Duan Zhanting（段占庭）.Heat transfer experiment of fatty acid falling-film evaporation[J]. Chemical Engineering, 2001, 06:20-23+2.
[12] 石程名, 王洋, 宫世吉.溴化锂溶液竖管内降膜蒸发传热性能分析[J]. 重庆大学学报, 2010, v.3309:113-118.
[13]SHI Cheng-ming（石程名）, WANG Yang（王洋）, GONG Shi-ji（宫世吉）.Heat transfer performance analysis of lithium bromide solution falling film evaporation in vertical tube.Journal of Chongqing University, 2010, v.3309:113-118.
[14] 牛小翠, 马晓建.木质素悬浮液管式降膜蒸发传热研究[J]. 化学工程, 2011, 12:44-47+54.
[15]牛小翠, -马晓建.Study on Evaporation Heat Transfer of Falling Film in Lignin Suspension[J].Chemical Engineering, 2011, 39(12):44-47
[16]Palen J W, Wang Q, Chen J C.Falling film evaporation of binary mixtures[J].AIChE Journal, 1994, 40(2):207-214
[17]Alla A N, Feddaoui M, Meftah H.Simultaneous heat and mass transfer inside a vertical channel in evaporating a heated falling glycols liquid film[J].Heat and Mass Transfer, 2015, 51(12):1747-1760
[18] Muram E, ?kesj? A, Jongsma A, et al.Experimental study of the heat transfer in a falling film evaporator: influence of the co-flowing vapor[C]. International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, 2014.
[19]Mura E, ?kesj? A, Vamling L, et al.Effect of Co-flowing Vapor during Vertical Falling-film Evaporation[J].Experimental Heat Transfer, 2016, 29(4):561-575
[20] Bhagat J J.Falling film evaporation in the cane sugar industry-an Indian experience[J]. Indian Sugar, 1997, 47: 101-110.
[21]Jorge L M M, Righetto A R, Polli P A, et al.Simulation and analysis of a sugarcane juice evaporation system[J].Journal of food engineering, 2010, 99(3):351-359
[22] Krueger A, Pouponnot F.Heat exchanger performance enhancement through the use of tube inserts in refineries and chemical plants–successful application examples: Spirelf, Turbotal and Fixotal systems[C]//Proc. International Conference on Heat Exchanger Fouling and Cleaning VIII, Austria. 2009: 399-406.
[23]Nindo C I, Tang J, Powers J R, et al.Viscosity of blueberry and raspberry juices for processing applications[J].Journal of Food Engineering, 2005, 69(3):343-350
[24]Dhir V K, Lienhard J H.Laminar film condensation on plane and axisymmetric bodies in nonuniform gravity[J].ASEM J Heat Transfer, 1971, 93(1):97-100
[25]Gregoring R, Kern J, Turek K.Improved correlation of film condensation data based on a more rigorous application of similarity parameters[J].Warme—Stoffubertrangung, 1974, 7(1):1-13
[26] 杨世铭, 陶文铨.传热学[M].第四版.北京：高等教育出版社, 2006:563.
[27]Yang shiming（杨世铭）, Tao wenquang（陶文铨）.Chuanrexue(in Chinese)[M]. The fourth edition.beijing：Higher Education Press, 2006:563.
