化工学报 ›› 2019, Vol. 70 ›› Issue (12): 4546-4555.DOI: 10.11949/0438-1157.20190685
收稿日期:
2019-06-19
修回日期:
2019-08-30
出版日期:
2019-12-05
发布日期:
2019-12-05
通讯作者:
陆建峰
作者简介:
沈向阳(1982—),男,博士,副教授,基金资助:
Xiangyang SHEN1(),Jing DING2,Jianfeng LU2()
Received:
2019-06-19
Revised:
2019-08-30
Online:
2019-12-05
Published:
2019-12-05
Contact:
Jianfeng LU
摘要:
半周加热太阳能吸热器管给管内对流传热系数带来影响,基于此,建立半周加热横纹管内熔盐对流传热的实验台和数值计算模型,分析横纹管槽宽、槽深对管内熔盐传热性能的影响规律,结果表明:从横纹管绝热侧到加热侧,周向管内壁温度逐渐升高,周向管内局部Nusselt数先减小后缓慢增大至稳定。横纹管凹槽处轴向管内壁温度明显低于平滑段,凹槽处轴向管内局部Nu较大,凹槽后与平滑段交界处管内局部Nu最小。横纹管槽越宽,加热侧轴向管内局部Nu越小,管内平均Nu越小,传热综合性能评价因子PEC越大。横纹管槽越深,轴向管内局部Nu越大,管内平均Nu越大,传热强化倍数Nu/Nu ST越大。槽宽对横纹管PEC的影响比槽深明显,槽深对横纹管内Nu/Nu ST影响比槽宽大。通过线性拟合得到半周加热横纹管内熔盐传热Nu的关联式,其计算Nu与模拟值最大偏差在±7%以内。
中图分类号:
沈向阳, 丁静, 陆建峰. 半周加热横纹管内熔盐强化传热特性[J]. 化工学报, 2019, 70(12): 4546-4555.
Xiangyang SHEN, Jing DING, Jianfeng LU. Heat transfer characteristic of molten salt in transverse corrugated tube with semi-circumference heating[J]. CIESC Journal, 2019, 70(12): 4546-4555.
管 | 槽宽(P 1)/mm | 槽深(e)/mm |
---|---|---|
管1(TC1) | 4.3 | 0.95 |
管2(TC2) | 5.8 | 0.95 |
管3(TC3) | 7.3 | 0.95 |
管4(TC4) | 5.8 | 0.73 |
管5(TC5) | 5.8 | 1.15 |
表1 横纹管结构参数
Table 1 Structural parameters of transverse corrugated tube
管 | 槽宽(P 1)/mm | 槽深(e)/mm |
---|---|---|
管1(TC1) | 4.3 | 0.95 |
管2(TC2) | 5.8 | 0.95 |
管3(TC3) | 7.3 | 0.95 |
管4(TC4) | 5.8 | 0.73 |
管5(TC5) | 5.8 | 1.15 |
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