酒窝型板式换热器流动换热特性分析及优化
摘要：以某公司实际使用的板式换热器为研究基础，对其强化结构(酒窝)分别增加了局部突起和长条突起，设计了2种改进板片，对其换热效果进行了模拟分析，并采用等泵功下性能评价指标作为衡量换热效果的指标。结果显示：2种改进板片的性能评价指标分别为1.09和1.10,均可达到较好的换热强化作用，其中增加长条突起的改进板片2可以在压降几乎不变的基础上将换热系数提高10.94%。
关键词：换热器酒窝结构优化改进板片换热强化性能评价指标
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[4] LEE Y J,LEE P S,CHOU S K.Enhanced thermal transport in microchannel using oblique fins[J].Journal of heat transfer,2012,134(10):101901.
[5] ZHENG N B,LIU W,LIU Z C,et al.A numerical study on heat transfer enhancement and the flow structure in a heat exchanger tube with discrete double inclined ribs[J].Applied thermal engineering,2015,90:232- 241.
[6] RASHIDI S,HORMOZI F,SUNDÉN B,et al.Energy saving in thermal energy systems using dimpled surface technology:a review on mechanisms and applications[J].Applied energy,2019,250:1491- 1547.
[7] HABIBISHANDIZ M,SAGHIR M Z.A critical review of heat transfer enhancement methods in the presence of porous media,nanofluids,and microorganisms[J].Thermal science and engineering progress,2022,30:101267.
[8] LUO L,DU W,WANG S T,et al.Multi-objective optimization of a solar receiver considering both the dimple/protrusion depth and delta-winglet vortex generators[J].Energy,2017,137:1- 19.
[9] KATKHAW N,VORAYOS N,KIATSIRIROAT T,et al.Heat transfer behavior of flat plate having 45° ellipsoidal dimpled surfaces[J].Case studies in thermal engineering,2014,2:67- 74.
[10] VORAYOS N,KATKHAW N,KIATSIRIROAT T,et al.Heat transfer behavior of flat plate having spherical dimpled surfaces[J].Case studies in thermal engineering,2016,8:370- 377.
[11] SHEN Z Y,XIE Y H,ZHANG D.Experimental and numerical study on heat transfer in trailing edge cooling passages with dimples/protrusions under the effect of side wall slot ejection[J].International journal of heat and mass transfer,2016,92:1218- 1235.
[12] ISAEV S A,SCHELCHKOV A V,LEONTIEV A I,et al.Numerical simulation of the turbulent air flow in the narrow channel with a heated wall and a spherical dimple placed on it for vortex heat transfer enhancement depending on the dimple depth[J].International journal of heat and mass transfer,2016,94:426- 448.
[13] DU W,LUO L,WANG S T,et al.Effect of the dimple location and rotating number on the heat transfer and flow structure in a pin finned channel[J].International journal of heat and mass transfer,2018,127:111- 129.
[14] LI M,KHAN T S,HAJRI E A,et al.Geometric optimization for thermal-hydraulic performance of dimpled enhanced tubes for single phase flow[J].Applied thermal engineering,2016,103:639- 650.
[15] 陶文铨.传热学[M].5版.北京：高等教育出版社，2019:232,272.
[16] FIROOZI A,MAJIDI S,AMERI M.A numerical assessment on heat transfer and flow characteristics of nanofluid in tubes enhanced with a variety of dimple configurations[J].Thermal science and engineering progress,2020,19:100578.
[17] 陶文铨.数值传热学[M].2版.西安：西安交通大学出版社，2001:2- 5.
[18] INCROPERA F P,DEWITT D P.Fundamentals of heat transfer[M].New York:John Wiley & Sons,2002:482.
[19] XIE G N,LIU J,LIGRANI P M,et al.Numerical analysis of flow structure and heat transfer characteristics in square channels with different internal-protruded dimple geometrics[J].International journal of heat and mass transfer,2013,67:81- 97.
[20] WEBB R L.Performance evaluation criteria for use of enhanced heat transfer surfaces in heat exchanger design[J].International journal of heat and mass transfer,1981,24(4):715- 726.
[21] FAN J F,DING W K,ZHANG J F,et al.A performance evaluation plot of enhanced heat transfer techniques oriented for energy-saving[J].International journal of heat and mass transfer,2009,52:33- 44.
Analysis and optimization of flow and heat transfer characteristics of dimple plate heat exchangers
Abstract: Based on the research of a plate heat exchanger actually used in a company, this paper adds local protrusions and long protrusions to its reinforcement structure(dimple), respectively, designs two kinds of improved plates, and uses the performance evaluation criteria under equal pump power as an index to evaluate the heat transfer performance. The results show that the performance evaluation criteria of the two improved plates are 1.09 and 1.10, respectively, and they can achieve better heat transfer enhancement. The improved plate 2 with long protrusions can increase the heat transfer coefficient by 10.94% on the basis of almost unchanged pressure drop.
Keywords: heat exchanger; dimple; structural optimization; improved plate; heat transfer enhancement; performance evaluation criteria;
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