利用紊流和纳米颗粒增强太阳能抛物槽集热器的传热:数值研究

IF 1.5 4区工程技术 Q3 ENGINEERING, MECHANICAL

Journal of Enhanced Heat Transfer Pub Date : 2023-01-01 DOI:10.1615/jenhheattransf.2022045462

Usman Allauddin, Muhammad Ikhlaq, Tariq Jamil, Fahad Alvi, Hibtullah A. Hussain, Hussain Mustafa, Muhammad Hassan Azeem

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引用次数: 0

摘要

太阳能利用装置在提供能源需求的很大一部分方面显示出有希望的潜力。在这些装置中，太阳能抛物槽集热器(PTC)是一种著名而有效的技术。近年来，为了进一步提高PTC系统的热性能，人们进行了大量的研究。目前的数值研究探讨了改变吸收管的几何形状和纳米颗粒对PTC热性能的影响。波纹管(CT)、正弦波纹管(SCT)、圆柱形波纹管(CI)、星形波纹管(SI)和增径杆形波纹管(IDRI)被用来改变吸收管的几何形状。波纹管也用体积浓度分别为2%、4%和6%的水- al2o3和水- tio2纳米流体进行分析。结果表明，正弦波纹管的吸波效果最好，其努塞尔数(Nu)值比简单波纹管高15.2%，且压力没有明显增加。此外，性能评价准则(PEC)值也大于简单的波纹几何。使用纳米流体作为传热流体(HTF)导致传热系数h的总体提高高达20%。

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HEAT-TRANSFER ENHANCEMENT OF A SOLAR PARABOLIC TROUGH COLLECTOR USING TURBULATORS AND NANOPARTICLES: A NUMERICAL STUDY

Solar energy harnessing devices exhibit promising potential for providing a significant portion of the energy requirement. Among these devices, the solar parabolic trough collector (PTC) is a well-renowned and effective technology. In recent times, a great deal of research has been done further improving the thermal performance of PTC systems. The current numerical study investigates the effect of modifications to the geometry of the absorber tube and the effect of nanoparticles on the thermal performance of PTC. A corrugated tube (CT), sinusoidal corrugated tube (SCT), the corrugated tube having a cylindrical insert (CI), star insert (SI), and increasing diameter rod insert (IDRI) are used to modify the geometry of the absorber tube. The corrugated tube is also analyzed with water-Al₂O₃ and water-TiO₂ nanofluids at volume concentrations of 2%, 4%, and 6%. The results showed that the sinusoidal corrugated tube produced the best results with a value of Nusselt number (Nu) being 15.2% greater than simple corrugated absorber tube without incurring any significant increase in pressure. Moreover, the performance evaluation criterion (PEC) value is also found to be greater than that of simple corrugated geometry. The use of nanofluids as the heat-transfer fluid (HTF) led to an overall enhancement in the heat transfer coefficient h by as much as 20%.

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来源期刊

Journal of Enhanced Heat Transfer 工程技术-工程：机械

CiteScore

3.60

自引率

8.70%

发文量

审稿时长

12 months

期刊介绍： The Journal of Enhanced Heat Transfer will consider a wide range of scholarly papers related to the subject of "enhanced heat and mass transfer" in natural and forced convection of liquids and gases, boiling, condensation, radiative heat transfer. Areas of interest include: ■Specially configured surface geometries, electric or magnetic fields, and fluid additives - all aimed at enhancing heat transfer rates. Papers may include theoretical modeling, experimental techniques, experimental data, and/or application of enhanced heat transfer technology. ■The general topic of "high performance" heat transfer concepts or systems is also encouraged.