Experimental Research on Heat Transfer Enhancement of Reciprocating Spiral-Inserts in Falling Film Evaporator Tubes

Guide

Abstract In order to effectively solve the problems of heat transfer and fouling in the heat exchange tube, a new heat transfer enhancement technique with reciprocating spiral-inserts in falling film evaporator tubes was proposed. It can improve the spiral movement inside the tubes and the collision situation between the spiral and tube wall. The influences of the structure parameters and the reciprocating stroke of the spiral, the process parameters such as the heat flux, the evaporation pressure and the fluid spraying density on the heat transfer performance of the falling film evaporation process were studied experimentally. The results show that the anti-fouling effect and heat transfer performance of the proposed technique are better than those of empty tube and simple spiral-insert. With the spiral outer diameter 30 mm, pitch 45 mm, wire diameter 1.8 mm and the reciprocating stroke 100 mm, the overall heat transfer coefficient is 2.08 times and 1.26 times of that of empty tube and the tube with simple spiral-insert respectively. The correlation of falling film evaporation heat transfer coefficient related to heat flux, evaporation pressure and spraying density are obtained through further data analysis.

	Service

	Email this article
	Add to my bookshelf
	Add to citation manager
	Email Alert
	RSS
	Articles by authors
	Peng Deqi
	Hou Jiaxin
	Chen Kang
	Wu Shuying
	Yu Tianlan

Keywords： falling film； evaporation； heat transfer； fouling； reciprocating spiral

Received 2019-11-28;

Fund:

About author:

Cite this article:

Peng Deqi, Hou Jiaxin, Chen Kang, Wu Shuying, Yu Tianlan.Experimental Research on Heat Transfer Enhancement of Reciprocating Spiral-Inserts in Falling Film Evaporator Tubes[J] Chemcial Industry and Engineering, 2020,V37(4): 15-22

[1] Zhou Y, Cai Z, Ning Z, et al. Numerical simulation of double-phase coupled heat transfer process of horizontal-tube falling film evaporation[J]. Applied Thermal Engineering, 2017, 118:33-40
[2] Lee Y T, Hong S, Dang C, et al. Heat transfer characteristics of obliquely dispensed evaporating falling films on an elliptic tube[J]. International Journal of Heat and Mass Transfer, 2019, 132:238-248
[3] 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, 67(2):512-518 Fan Yongjian, Xu Hong, Xu Peng. Heat transfer experiment of falling-film evaporation in vertical porous tube[J]. CIESC Journal, 2016, 67(2):512-518(in Chinese)
[4] 郝丽, 肖晓明, 张吕鸿, 等. 竖直管降膜蒸发器流动与传热过程的数值模拟[J]. 化学工业与工程, 2014, 31(2):60-65 Hao Li, Xiao Xiaoming, Zhang Lvhong, et al. Numerical simulation of the flow and heat transfer process of vertical tube falling film evaporator[J]. Chemical Industry and Engineering, 2014, 31(2):60-65(in Chinese)
[5] 王为术, 王涛, 彭岩, 等. 竖直管内R113降膜流动数值模拟[J]. 科学技术与工程, 2017, 17(18):63-68 Wang Weishu, Wang Tao, Peng Yan, et al. Numerical simulation on falling flow of R113 inside a vertical tube[J]. Science Technology and Engineering, 2017, 17(18):63-68(in Chinese)
[6] 许杰. 管内插钢丝螺旋间歇自转及对流传热特性[J]. 环境工程, 2015, 33(S1):509-512 Xu Jie. Intermittent self-rotating and convective heat transfer performance of spiral insert in tubes[J]. Environmental Engineering, 2015, 33(S1):509-512(in Chinese)
[7] Sheikholeslami M, Gorji-Bandpy M, Ganji D D. Review of heat transfer enhancement methods:Focus on passive methods using swirl flow devices[J]. Renewable and Sustainable Energy Reviews, 2015, 49:444-469
[8] San J, Huang W, Chen C. Experimental investigation on heat transfer and fluid friction correlations for circular tubes with coiled-wire inserts[J]. International Communications in Heat and Mass Transfer, 2015, 65:8-14
[9] Gunes S, Ozceyhan V, Buyukalaca O. The experimental investigation of heat transfer and pressure drop in a tube with coiled wire inserts placed separately from the tube wall[J]. Applied Thermal Engineering, 2010, 30(13):1719-1725
[10] Ehsan G,Ebrahim H, Mohammadreza B J, et al. Study of intensification of the heat transfer in helically coiled tube heat exchangers via coiled wire inserts[J]. International Journal of Thermal Sciences, 2019, 141:72-83
[11] Salimpour M R, Gholami H. Effect of inserting coiled wires on pressure drop of R-404A condensation[J]. International Journal of Refrigeration, 2014, 40:24-30
[12] 韩怀志, 陈鑫, 胡怡然, 等. 内插松弛扭带波节管的流动与传热特性的数值模拟[J]. 化工学报, 2018, 69(4):1374-1384 Han Huaizhi, Chen Xin, Hu Yiran, et al. Numerical study on flow and heat transfer characteristics in corrugated tube with loose-fit twisted tape insert[J]. CIESC Journal, 2018, 69(4):1374-1384(in Chinese)
[13] 雷诗毅, 郭亚军, 桂淼, 等. 横纹槽管内插断续扭带复合强化传热的实验研究[J]. 热能动力工程, 2016, 31(9):15-19, 130 Lei Shiyi, Guo Yajun, Gui Miao, et al. Experimental study of the complex intensified heat transfer by intermittently inserting twisted strips into a transversely slotted tube[J]. Journal of Engineering for Thermal Energy and Power, 2016, 31(9):15-19, 130(in Chinese)
[14] 雷诗毅, 郭亚军, 桂淼, 等. 横纹槽管内插扭带复合强化传热的试验研究[J]. 机械工程学报, 2016, 52(24):142-146 Lei Shiyi, Guo Yajun, Gui Miao, et al. Experimental study on compound heat transfer enhancement of transverse corrugated tube with full length twisted tapes[J]. Journal of Mechanical Engineering, 2016, 52(24):142-146(in Chinese)
[15] Eiamsa-Ard S, Promthaisong P, Thianpong C, et al. Influence of three-start spirally twisted tube combined with triple-channel twisted tape insert on heat transfer enhancement[J]. Chemical Engineering and Processing:Process Intensification, 2016, 102:117-129
[16] He L, Yang W, Guan C, et al. Experimental investigation on flow characteristics in circular tube inserted with rotor-assembled strand using PIV[J]. Chinese Journal of Chemical Engineering, 2019, 27(1):1-9
[17] 张连山, 邓先和, 杨志平, 等. 缩放管内插旋流片的自然对流换热实验与数值模拟[J]. 华南理工大学学报(自然科学版), 2013, 41(7):94-101 Zhang Lianshan, Deng Xianhe, Yang Zhiping, et al. Experimental investigation and numerical simulation of natural convection heat transfer in converging-diverging tube with twisted tapes[J]. Journal of South China University of Technology(Natural Science Edition), 2013, 41(7):94-101(in Chinese)
[18] 彭德其, 叶磊, 田清, 等. 节能型硫酸锰连续加热结晶工艺试验研究[J]. 现代化工, 2013, 33(5):97-100, 102 Peng Deqi, Ye Lei, Tian Qing, et al. Experiment study on energy saving type continuous heating crystallization process for manganese sulphate[J]. Modern Chemical Industry, 2013, 33(5):97-100, 102(in Chinese)
[19] Xin F, Liu Z, Wang S, et al. Study of heat transfer in oscillatory flow for a Stirling engine heating tube inserted with spiral spring[J]. Applied Thermal Engineering, 2018, 143:182-192
[20] Salari S, Goudarzi K. Intensification of heat transfer in heater tubes of city gas stations using spiral spring inserts[J]. Thermal Science & Engineering Progress, 2017, 3:123-132
[21] Sharafeldeen M A, Berbish N S, Moawed M A, et al. Experimental investigation of heat transfer and pressure drop of turbulent flow inside tube with inserted helical coils[J]. Heat and Mass Transfer, 2017, 53(4):1265-1276
[22] 彭德其, 谭卓伟, 张浪, 等. 换热器换热管内插螺旋流态化传热及除防垢的影响因素[J]. 过程工程学报, 2015, 15(6):935-939 Peng Deqi, Tan Zhuowei, Zhang Lang, et al. Influential factors in heat transfer and anti-fouling of heat exchanger tube-inserted fluidization[J]. The Chinese Journal of Process Engineering, 2015, 15(6):935-939(in Chinese)
[23] 俞天兰, 刘桂英, 俞秀民, 等. 动力轮强化塑包钢丝螺旋线自动清洗与传热强化技术[J]. 工程设计学报, 2006, 13(2):95-98 Yu Tianlan, Liu Guiying, Yu Xiumin, et al. Automatic cleaning and heat transfer enhancing technology for intensified steel spiral with plastic coat on driving wheel[J]. Journal of Engineering Design, 2006, 13(2):95-98(in Chinese)
[24] 俞天兰, 刘阳平, 俞天翔, 等. 自然循环蒸发器往复螺旋流体动力清洗实验研究[J]. 过程工程学报, 2013, 13(3):374-377 Yu Tianlan, Liu Yangping, Yu Tianxiang, et al. Experimental research on the hydrodynamic cleaning reciprocating-spiral technology in natural circulation evaporators[J]. The Chinese Journal of Process Engineering, 2013, 13(3):374-377(in Chinese)
[25] 张礼. 反循环蒸发器内波动流体对螺旋的传热性能影响研究[D]. 湖南湘潭:湘潭大学, 2015 Zhang Li. Research on the impact of the fluctuant fluid on the heat transfer performance in reverse-cycle evaporators[D]. Hunan Xiangtan:Xiangtan University, 2015(in Chinese)
[26] 陈黎. 立式降膜加热管内往复螺旋防除垢性能研究[D]. 湖南湘潭:湘潭大学, 2014 Chen Li. Research on anti-fouling performance with reciprocating spiral in of falling film heating tubes[D]. Hunan Xiangtan:Xiangtan University, 2014
[27] 魏峰, 孙秀松, 翟民, 等. 管内插入螺旋线的降膜蒸发传热研究[J]. 化工机械, 2005, 32(2):72-77 Wei Feng, Sun Xiusong, Zhai Min, et al. Researches on the falling film evaporation heat transfer of tubes inserted helixes[J]. Chemical Engineering & Machinery, 2005, 32(2):72-77(in Chinese)
[28] 郑东光, 孙会朋, 杜亮坡, 等. 水平管降膜蒸发器蒸发传热性能实验研究[J]. 化工装备技术, 2008, 29(3):35-37 Zheng Dongguang, Sun Huipeng, Du Liangpo, et al. Experimental study on evaporation heat transfer performance of horizontal tube falling film evaporator[J]. Chemical Equipment Technology, 2008, 29(3):35-37(in Chinese)
[29] 王为术, 马自强, 朱晓静, 等. 垂直管内R113降膜蒸发传热试验研究[J]. 流体机械, 2018, 46(6):55-59 Wang Weishu, Ma Ziqiang, Zhu Xiaojing, et al. Experimental research on heat transfer characteristics of R113 falling film evaporator in vertical tube[J]. Fluid Machinery, 2018, 46(6):55-59(in Chinese)
[30] 黄阔. 降膜蒸发器传热传质强化及应用研究[D]. 广州:华南理工大学, 2018 Huang Kuo. Heat and mass transfer enhancement of falling film evaporator and its applications[D]. Guangzhou:South China University of Technology, 2018(in Chinese)
[31] 上官闪闪. 竖直圆管管内R113降膜流动与蒸发换热特性数值模拟[D]. 郑州:华北水利水电大学, 2016 Shangguan Shanshan. Numerical simulation on falling flow and evaporative heat transfer characteristics of R113 inside a vertical tube[D]. Zhengzhou:North China University of Water Resources and Electric Power, 2016(in Chinese)