采用pcm分散的单/混合纳米流体对锥形线圈插片双管换热器热特性的实验研究

IF 2.5 3区工程技术 Q2 ENGINEERING, MECHANICAL

Experimental Heat Transfer Pub Date : 2023-09-14 DOI:10.1080/08916152.2023.2256315

Sumit Kr. Singh, Vivek Kumar, Amit Kumar, Sujeet Yadav

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引用次数: 0

摘要

摘要采用水基相变材料(PCM)分散的单/混合纳米流体，对双管换热器中锥形线圈插片进行了实验研究。在不同雷诺数条件下，研究了含纳米流体的金属丝圈(WC)对系统热液性能的影响，包括:会聚金属丝圈(CWC)、发散金属丝圈(DWC)和会聚-发散金属丝圈(CDWC)。实验结果表明，在所有测试线圈布置中，DWC的热性能因子(TPF)高于其他布置。与普通线圈(PWC)、CWC和CDWC相比，采用DWC制备的Al2O3+PCM混合纳米流体的TPF分别提高了3.98%、9.61%和3.04%。此外，DWC构型在所有构型中熵产最小。在体积流量为15 lpm时，使用DWC制备的Al2O3+PCM混合纳米流体的熵产比PWC、CWC和CDWC分别减少了约13.36%、9.78%和5.78%。关键词:纳米流体级联线圈双管换热器传热增强熵生成能效命名CWC=会聚线圈cdwc =会聚-发散线圈DWC=发散线圈cp=比热(J/kg. k)d=直径(m)r=半径(m)DWC=发散线圈f=摩擦系数h=传热系数(W/m2.K)k=导热系数(W/m.K)L=管长(m)m=质量流量(kg/s)Nu=努瑟尔numberΔp=压力损失(Pa)Pr=普朗特数q =传热速率(W)Re=雷诺兹数字=熵(W/K)T=温度(K)Φ=体积浓度(%)µ=动态粘度(Pa.s)ρ=密度(kg/m3)Subscripts=avg=平均值=代eq=当量，nf=热，纳米流体=对流换热系数，o=内，外，外=入口，出口np=纳米粒子，ot=内管，外管= total披露声明作者未报告潜在的利益冲突。

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Experimental study of the thermal characteristic of a double tube heat exchanger with tapered wire coil inserts using PCM-dispersed mono/hybrid nanofluids

ABSTRACTAn experimental study involving tapered wire coil inserts in a double-tube heat exchanger using water-based phase change material (PCM)-dispersed mono/hybrid nanofluids is conducted. The effects of the wire coils (WC) with nanofluids on the hydrothermal performance of this system are studied for different coil arrangements: converging wire coils (CWC), diverging wire coils (DWC), and converging-diverging wire coils (CDWC) and different Reynolds numbers. The experimental results indicate that among all the tested coil arrangements, the DWC presents a higher thermal performance factor (TPF) than the other arrangements. Using the DWC, the TPF of the Al2O3+PCM hybrid nanofluid is augmented by 3.98%, 9.61%, and 3.04% as compared to that for the plain wire coil (PWC), CWC, and CDWC, respectively. Besides, the DWC configuration exhibits the minimum entropy generation among all arrangements. For the Al2O3+PCM hybrid nanofluid using the DWC, the entropy generation is decreased by approximately 13.36%, 9.78%, and 5.78% as compared to that of the PWC, CWC, and CDWC at a volumetric flow rate of 15 lpm.KEYWORDS: Nanofluidstapered wire coildouble tube heat exchangerheat transfer enhancemententropy generationenergy efficiency Nomenclatures CWC=Converging wire coilCDWC=Converging-diverging wire coilDWC=Diverging wire coilcp=Specific heat (J/kg.K)d=Diameter (m)r=Radius (m)DWC=Diverging wire coilf=Friction factorh=Heat transfer coefficient (W/m2.K)k=Thermal conductivity (W/m.K)L=Tube length (m)m=Mass flow rate (kg/s)Nu=Nusselt numberΔp=Pressure lose (Pa)Pr=Prandtl numberQ=Heat transfer rate (W)Re=Reynolds numberS=Entropy (W/K)T=Temperature (K)Φ=Volume concentration (%)µ=Dynamic viscosity (Pa.s)ρ=Density (kg/m3)Subscripts=avg=Averagegen=Generationeq=Equivalenth, nf=Hot, nanofluidht=Convective heat transfer coefficienti, o=Inner, outerin, out=Inlet, outletnp=Nanoparticleit, ot=Inner tube, outer tubetot=TotalDisclosure statementNo potential conflict of interest was reported by the author(s).

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来源期刊

Experimental Heat Transfer 工程技术-工程：机械

CiteScore

6.30

自引率

37.10%

发文量

审稿时长

>12 weeks

期刊介绍： Experimental Heat Transfer provides a forum for experimentally based high quality research articles and communications in the general area of heat-mass transfer and the related energy fields. In addition to the established multifaceted areas of heat transfer and the associated thermal energy conversion, transport, and storage, the journal also communicates contributions from new and emerging areas of research such as micro- and nanoscale science and technology, life sciences and biomedical engineering, manufacturing processes, materials science, and engineering. Heat transfer plays an important role in all of these areas, particularly in the form of innovative experiments and systems for direct measurements and analysis, as well as to verify or complement theoretical models. All submitted manuscripts are subject to initial appraisal by the Editor, and, if found suitable for further consideration, to peer review by independent, anonymous expert referees. All peer reviews are single blind and submission is online via ScholarOne Manuscripts. Original, normal size articles, as well as technical notes are considered. Review articles require previous communication and approval by the Editor before submission for further consideration.