Heat transfer characteristic of molten salt in transverse corrugated tube with semi-circumference heating

SHEN Xiangyang; DING Jing; LU Jianfeng

doi:10.11949/0438-1157.20190685

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Heat transfer characteristic of molten salt in transverse corrugated tube with semi-circumference heating

Fluid dynamics and transport phenomena | 更新时间：2026-07-24

- Heat transfer characteristic of molten salt in transverse corrugated tube with semi-circumference heating
- CIESC Journal Vol. 70, Issue 12, Pages: 4546-4555(2019)
- 作者机构：
  
  1.仲恺农业工程学院机电工程学院，广东广州 510225
  2.中山大学材料科学与工程学院，广东广州 510006
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190685
  CLC： TK 124
- Received：19 June 2019，
  
  Revised：2019-08-30，
  
  Online First：09 June 2020，
  
  Published：05 December 2019
- 稿件说明：
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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

SHEN Xiangyang, DING Jing, LU Jianfeng. Heat transfer characteristic of molten salt in transverse corrugated tube with semi-circumference heating[J]. CIESC Journal, 2019, 70(12): 4546-4555
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 DOI： 10.11949/0438-1157.20190685.

SHEN Xiangyang, DING Jing, LU Jianfeng. Heat transfer characteristic of molten salt in transverse corrugated tube with semi-circumference heating[J]. CIESC Journal, 2019, 70(12): 4546-4555 DOI： 10.11949/0438-1157.20190685.

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

较大，凹槽后与平滑段交界处管内局部

最小。横纹管槽越宽，加热侧轴向管内局部

越小，管内平均

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

越大，管内平均

越大，传热强化倍数

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

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

的关联式，其计算

与模拟值最大偏差在±7%以内。

Abstract

The semi-circumferential heating of the solar heat absorber tube has an effect on the convective heat transfer coefficient in the tube. Base on this

convection heat transfer experimental system and mathematical model of transverse corrugated tube are established to analyze the h

eat transfer performance of molten salt with different groove width and height. The results show that the circumferentially temperature of inner wall increases

and the circumferentially local Nusselt number decreases first and then increases to stability with transverse corrugated tube from adiabatic side to heated side. The axial temperature of inner wall with groove obviously lower than that of smooth section

the axial local Nusselt number of groove in transverse corrugated tube is relatively large

and the convergence of after groove and smooth section is minimal. The axial local Nusselt number of heated side and the average Nusselt number in transverse corrugated tube decrease with the groove width increases

while the PEC(comprehensive performance evaluation factor) rises. The axial local Nusselt number

the average Nusselt number and

(enhanced heat transfer ratio) increase with the groove height increment. The PEC of transverse corrugated tube is obvious affected by groove width

while the

is remarkable affected by groove height. The Nusselt number rule equation of molten salt in transverse corrugated tube with circumferentially non-uniform heat flux is obtained

and the maximum deviation of

between calculated and simulated value is within ±7%.

关键词

Keywords

references

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