Numerical Study of Flow and Heat Transfer Characteristics of Shell-and-Tube Molten Salt Electric Heater with Circularly Perforated Baffles  

作　　者：LIN Yongjie ZHANG Cancan WU Yuting ZHANG Yi LU Yuanwei 

机构地区：[1]Key Laboratory of Heat Transfer and Energy Conversion,National User-Side Energy Storage Innovation Research and Development Center,Beijing University of Technology,Beijing 100124,China

出　　处：《Journal of Thermal Science》2025年第1期24-33,共10页热科学学报(英文版)

基　　金：supported by National Key Research and Development Program of China(2022YFB2405203);Science and Technology General Project of Beijing Municipal Education Commission(KM202210005016);Inner Mongolia Science and Technology Major Project(2021SZD0036);Beijing Natural Science Foundation(3242015)。

摘　　要：Numerical simulations of the flow and heat transfer characteristics of four shell-and-tube molten salt electric heaters with different perforation rates was conducted.Shell-and-tube electric heaters have the same geometry and tube arrangement,and all of them use single segmental baffles,but there exist four different baffle openings(φ),i.e.,0%,2.52%,4.06%,and 6.31%.The results indicated that the reasonable baffle opening could significantly reduce the shell-side pressure drop,effectively decreasing the shell-side flow dead zone area.They can eliminate the local high-temperature phenomenon on the surface of electric heating tubes,but the heat transfer coefficient is slightly decreased.All perforated schemes significantly reduce shell-side pressure drop compared to the baseline solution without open holes.In particular,the φ=6.31% scheme exhibits the optimal performance among all the schemes,with a maximum reduction of up to 50.50% in shell-side pressure drop relative to the unopened holes scheme.The heat transfer coefficient is the highest for φ=0%,exhibiting a range of5.26% to 5.73%,5.14% to 5.99%,and 7.31% to 8.54% higher than φ=2.52%,4.06%,and 6.31%,respectively,within the calculated range.The composite index h/(Δp)^(1/3)was higher for all open-hole solutions than that for the unopened-hole solution.The best overall performance was for φ=6.31%,which improved the composite index by15.29%to 17.18%over the unopened-hole solution.

关 键 词：molten salt electric heater perforated baffles heat transfer 

分 类 号：TM73[电气工程—电力系统及自动化] TK124[动力工程及工程热物理—工程热物理]