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| 1 | Experimental research on stabilities, thermophysical properties and heat transfer enhancement of nanofluids in heat exchanger systems显示文摘Stable TiO_2–water nanofluids are prepared by a two-step method, stabilities of nanofluids are investigated by precipitation method and transmittance method respectively, and thermal conductivities and viscosities are also measured. An experimental system for studying the heat transfer enhancement of nanofluids is established,and heat transfer and flow characteristics of TiO_2–water nanofluids in heat exchanger systems with a triangular tube and circular tube are experimentally studied. The effects of nanoparticle mass fractions(ω = 0.1 wt%–0.5 wt%) and Reynolds numbers(Re = 800–10000) on the heat transfer and flow performances of nanofluids are analyzed. Fitting formulas for Nusselt number and resistance coefficient of nanofluids in a triangular tube are put forward based on the experimental data. The comprehensive performances of nanofluids in a triangular tube are investigated. It is found that nanofluids in a triangular tube can significantly improve the heat transfer performance at the cost of a small increase in resistance coefficient compared with that in a circular tube, especially the resistance coefficients are almost the same between different nanoparticle mass fractions at turbulent flow. It is also found that the comprehensive evaluation index η decreases with Reynolds number at laminar flow but a critical maximum value appears at turbulent flow. | Cong Qi Maoni Liu Guiqing Wang Yuhang Pan Lin Liang | 2018 | Chinese Journal of Chemical Engineering2018，26，12： | 1 |
| 2 | Experimental study on thermo-hydraulic performances of nanofluids flowing through a corrugated tube filled with copper foam in heat exchange systems显示文摘Thermo-hydraulic characteristics of TiO_2-water nanofluids in thin-wall stainless steel test tubes(corrugated tube and circular tube) filled with copper foam(40 PPI) are experimentally investigated and compared with those in test tubes without copper foam. The effects of nanoparticle mass concentration on flow and heat transfer performances are investigated. In addition, the mutual restriction relationships between Reynolds number(Re), Nusselt number(Nu) and resistance coefficient(f) are discussed respectively. Also, the comprehensive coefficient of performance(CCP) between heat transfer and pressure drop is evaluated. The results show that core-enhancement region for heat transfer using experimental tubes filled with copper foam is notably different from that of tubes without copper foam. There is a corresponding Reynolds number(about Re = 2400) for the maximum CCP of each condition. And the heat transfer can be enhanced dramatically and sustained at 8000 ≤ Re ≤ 12000. | Yongliang Wan Runhan Wu Cong Qi Gang Duan Ruizhao Yang | 2018 | Chinese Journal of Chemical Engineering2018，26，12： | 1 |
| 3 | Investigations on pool boiling critical heat flux, transient characteristics and bonding strength of heater wire with aqua based reduced graphene oxide nanofluids显示文摘In the present work, the pool boiling critical heat flux, transient heat transfer characteristics, and bonding strength of thin Ni-Cr wire with aqua based reduced graphene oxide(r GO) nanofluids are experimentally studied. Results indicate:(i) the critical heat flux(CHF) of 0.01, 0.05, 0.1, 0.2, and 0.3 g·L^(-1) concentrations of r GO-water nanofluids varies from 1.42 to 2.40 MW·m^(-2);(ii) the CHF remains same for the tested samples during transient heat transfer studies and(iii) a constant value of CHF upto 10 tests when the nanocoated Ni-Cr wire is tested with DI water and deterioration occurs beyond this which implies a chance of peel off of r GO layer below the critical coating thickness. | R. Kamatchi G. Kumaresan | 2018 | Chinese Journal of Chemical Engineering2018，26，3： | 0 |
| 4 | 低浓度纳米流体强化传热传质的研究进展显示文摘通过添加纳米颗粒来调控基础液体传热传质特性的方法已经广受关注,国内外已围绕纳米颗粒干预下的流体物理化学性质强化及其应用开展了一系列的实验和理论研究工作。本文综述了低浓度纳米颗粒对基础流体特征参数的影响,包括粘度、表面张力、比热容、热导率、对流换热系数、分子扩散率及对流传质系数等。另外,本文分析概述了低浓度纳米颗粒对气液两相体系传质强化的应用研究进展,包括纳米颗粒干预下的气液两相体系动力学行为规律、流动传质机理及传质体系强化方法等。综述及分析低浓度纳米流体的研究现状及发展动态不仅对其下一步的研究方向具有指导意义,而且有望为新型纳米流体的开发提供新思路。 | 胡琴 李丽荣 | 2023 | 能源研究与利用2023，，4： | 0 |
| 5 | CuO-H_(2)O纳米流体对半圆形螺旋通道内湍流传热特性分析显示文摘基于Mixture模型模拟了半圆形螺旋通道内CuO-H_(2)O纳米流体的传热特性,在雷诺数Re=9000~20000范围内,分析了不同纳米流体体积分数(φ=0.1%~2%)下的螺旋通道传热特性,并利用传热强化因子PEC和协同数Fc评价了半圆形螺旋通道的综合强化传热性能。研究结果表明:在纯水中添加CuO纳米颗粒能够提升流体的导热能力,从而提高流体的传热效果,与纯水相比平均努赛尔数Nu最高可提升7.06%;当纳米流体体积分数φ≤1.0%时,平均努赛尔数Nu随着体积分数φ的增大而提高,而当φ>1.0%时,Nu随着体积分数φ的增大而降低;在所研究的雷诺数范围内,系统压降均随着体积分数φ的增加而增大,但增加相对幅度较小,最高体积分数压降相比最低体积分数增幅小于4.17%;沿螺旋通道主流流动方向,截面努赛尔数Nuc逐渐降低,降幅最大为8.17%;随体积分数φ的增加,PEC和Fc呈现先增大后降低的变化规律,φ=1.0%时,PEC和Fc取得最大值。 | 王超 王宗勇 张伟 韩旭 刘磊 付启慧 | 2023 | 当代化工2023，52，11： | 0 |
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