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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Experimental investigation on heat transfer and pressure drop of MWCNT - Solar glycol based nanofluids in shot peened double pipe heat exchanger
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Experimental investigation on heat transfer and pressure drop of MWCNT - Solar glycol based nanofluids in shot peened double pipe heat exchanger

机译：MWCNT - 太阳能二醇的热传递和压降的实验研究，纳米流体在喷丸双管热交换器中的纳米流体

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摘要

The present work aims at analyzing the heat transfer, pressure drop characteristics and determination of Nusselt number in a double pipe heat exchanger, who's inner surface is modified through the shot peening process. The effects of shot peening on the fluid flow and heat transfer in the annulus are studied in detail and the results are reported. First, the convective heat transfer coefficient (CHTC) and pressure drop of water flow in the heat exchanger with a modified/roughened surface was measured and compared with a smooth tube. Later, the study is extended to analyze the variations in CHTC, the pressure drop of the nanofluid multi-walled carbon nanotubes (MWCNT-Solar glycol). The experiments were carried out at different volume concentrations (02%, 0.4%, and 0.6%) of the nanofluids. Experimental results showed that shot peening in tube surfaces has an appreciable effect on the performance of flow behavior and heat transfer. The CHTC of the nanofluid containing 0.6% of MWCNT nanomaterials is improved to a maximum of similar to 115% at a mass flow rate of 0.04 kg/s. Enhancement in thermal conductivity up to 30.59% was achieved with the MWCNT volume concentration of 0.6% and a temperature range from 30 to 50 degrees C. Pressure drop increased with an increase in mass flow rate, and volume concentrations of MWCNT nanoparticles. The augmentation in pressure drop for 0.6% volume concentration of MWCNT-solar-glycol nanofluid is 1.56 times for a mass flow rate of 0.08 kg/s. The experimental results show that the combination of shot peening and nanofluids in the heat exchanger increases its heat transfer rate as well as its thermo-hydraulic performance. (C) 2019 Elsevier B.V. All rights reserved.
机译：本作者旨在分析双管热交换器中的热传递，压降特征和何地区的营养数量，谁通过喷丸处理改变了内表面。详细研究了射击喷丸对流体流动和热传递的影响，并报告了结果。首先，测量与改性/粗糙表面的热交换器中的热传递系数（CHTC）和水流量的压力下降，并与光滑的管进行比较。后来，该研究扩展以分析CHTC的变化，纳米流体多壁碳纳米管（MWCNT-太阳醇）的压降。该实验以不同的体积浓度（02％，0.4％和0.6％）进行纳米流体进行。实验结果表明，管道中喷丸的喷丸对流动性能和传热的性能具有明显的影响。含有0.6％MWCNT纳米材料的纳米流体的CHTC得到改善至最大类似于0.04kg / s的质量流量的115％。在MWCNT体积浓度为0.6％的MWCNT体积浓度和30至50摄氏度的温度范围内，增加了高达30.59％的热导率高。随着质量流量的增加，压力下降和MWCNT纳米颗粒的体积浓度增加。压降的增强率为0.6％MWCNT-Solar-乙二醇纳米流体的1.56倍，质量流量为0.08kg / s。实验结果表明，热交换器中喷丸和纳米流体的组合增加了其传热速率以及其热液压性能。 （c）2019年Elsevier B.V.保留所有权利。

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