首页|Numerical Study of Flow and Heat Transfer Characteristics of Shell-and-Tube Molten Salt Electric Heater with Circularly Perforated Baffles
Numerical Study of Flow and Heat Transfer Characteristics of Shell-and-Tube Molten Salt Electric Heater with Circularly Perforated Baffles
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国家科技期刊平台
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Numerical Study of Flow and Heat Transfer Characteristics of Shell-and-Tube Molten Salt Electric Heater with Circularly Perforated Baffles
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 of 5.26％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 by 15.29％to 17.18％over the unopened-hole solution.
molten saltelectric heaterperforated bafflesheat transfer
LIN Yongjie、ZHANG Cancan、WU Yuting、ZHANG Yi、LU Yuanwei
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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
molten salt electric heater perforated baffles heat transfer
国家科技期刊平台
NSTL
万方数据
